[advtrains] přechod na Advtrains 2.5.0 (první pokus)

- [ch_core/lib] drobná oprava
- [advtrains_attachment_offset_patch] použití initial_properties

120 files changed, 32471 insertions, 3279 deletions

diff --git a/.build.yml b/.build.yml
index 303348f..5234336 100644
--- a/.build.yml
+++ b/.build.yml
@@ -1,22 +1,38 @@
 image: debian/stable
 packages: 
 - git
+- lua5.1
+- luarocks
 - curl
 - minetest-server
 - unzip
 - wget
 - lua-busted
+- luajit
 sources :
 - https://git.sr.ht/~gpcf/advtrains
 
+artifacts:
+- advtrains.luacov.report.out
+- advtrains_interlocking.luacov.report.out
+
 tasks:
 
-- download_mt_server: |
-    mkdir bin
-    wget https://lifomaps.de/advtrains-test/builtin.tar.gz
-    tar xf builtin.tar.gz
-    curl https://lifomaps.de/advtrains-test/minetestserver -o ~/bin/minetestserver
-    chmod +x ~/bin/minetestserver
+- install_mineunit : |
+    for i in {busted,luacov}; do
+        luarocks install --local --lua-version 5.1 $i >/dev/null
+    done
+    luarocks install --local --lua-version 5.1 --server=https://luarocks.org/dev mineunit
+- run_unit_tests : |
+    cd advtrains/serialize_lib
+    ~/.luarocks/bin/busted
+    for i in {advtrains,advtrains_interlocking}; do
+        cd ../$i
+        ~/.luarocks/bin/mineunit -c
+        ~/.luarocks/bin/mineunit -r
+        sed -n '/^File/,$p' luacov.report.out
+        mv luacov.report.out ~/$i.luacov.report.out
+    done
 - install_mt_game : |
     curl -L https://github.com/minetest/minetest_game/archive/master.zip -o master.zip
     mkdir -p .minetest/games/
@@ -28,13 +44,6 @@ tasks:
     curl https://lifomaps.de/advtrains-test/testworld.tar.gz -o ~/testworld.tar.gz
     cd .minetest/worlds/
     tar xf ../../testworld.tar.gz
-- run_unit_tests : |
-    cd advtrains/advtrains
-    busted
-    cd ../advtrains_interlocking
-    busted
-    cd ../serialize_lib
-    busted
 - activate_test_env: |
     cd advtrains
     git merge --no-commit origin/luaatcdebug
@@ -45,4 +54,9 @@ tasks:
     git clone https://git.bananach.space/basic_trains.git/
 - run_test_world: | 
     echo "bind_address = 127.0.0.1" > minetest.conf
-    ~/bin/minetestserver --port 31111 --gameid minetest_game --config ~/minetest.conf --world ~/.minetest/worlds/advtrains_testworld
+    minetestserver --port 31111 --gameid minetest_game --config ~/minetest.conf --world ~/.minetest/worlds/advtrains_testworld --logfile ~/minetest.log
+- test_po_files : |
+    cd advtrains/advtrains
+    for f in po/*.po; do
+      luajit -e 'require("poconvert").from_string("advtrains", io.input():read("*a"))' < $f
+    done
diff --git a/.gitignore b/.gitignore
index b3180de..42eaf06 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,6 @@
 ## Eclipse project files & directories
 .project
 .settings
+luacov.*
+advtrains/locale/*.tr
+advtrains/po/*~
diff --git a/advtrains/api_doc.txt b/advtrains/api_doc.txt
index 5668ba3..6b338a7 100644
--- a/advtrains/api_doc.txt
+++ b/advtrains/api_doc.txt
@@ -18,8 +18,6 @@ advtrains.register_wagon(name, prototype, description, inventory_image)
 # Wagon prototype properties
 {
 	... all regular luaentity properties (mesh, textures, collisionbox a.s.o)...
-	drives_on = {default=true},
-	^- used to define the tracktypes (see below) that wagon can drive on. The tracktype identifiers are given as keys, similar to privileges)
 	max_speed = 10,
 	^- optional, default 10: defines the maximum speed this wagon can drive. The maximum speed of a train is determined by the wagon with the lowest max_speed value.
 	seats = {
diff --git a/advtrains/atc.lua b/advtrains/atc.lua
index d314b3c..8e54b08 100644
--- a/advtrains/atc.lua
+++ b/advtrains/atc.lua
@@ -94,6 +94,7 @@ function atc.train_reset_command(train, keep_tarvel)
 	train.atc_brake_target=nil
 	train.atc_wait_finish=nil
 	train.atc_wait_autocouple=nil
+	train.atc_wait_signal=nil
 	train.atc_arrow=nil
 	if not keep_tarvel then
 		train.tarvelocity=nil
@@ -106,142 +107,8 @@ local apn_func=function(pos)
 	-- FIX for long-persisting ndb bug: there's no node in parameter 2 of this function!
 	local meta=minetest.get_meta(pos)
 	if meta then
-		meta:set_string("infotext", attrans("ATC controller, unconfigured."))
-		-- meta:set_string("formspec", atc.get_atc_controller_formspec(pos, meta))
-	end
-end
-
--- formspec and callback:
-
-local function get_custom_state(pos)
-	local node = minetest.get_node(pos)
-	local meta = minetest.get_meta(pos)
-	return {
-		pos = pos,
-		node_name_f = minetest.formspec_escape(node.name),
-		mode = tonumber(meta:get_string("mode")) or 1,
-		command = meta:get_string("command"),
-		command_on = meta:get_string("command_on"),
-		channel = meta:get_string("channel"),
-		line = meta:get_string("line"),
-		routingcode = meta:get_string("routingcode"),
-		text_inside = meta:get_string("text_inside"),
-		text_outside = meta:get_string("text_outside"),
-		ars = meta:get_string("ars"),
-	}
-end
-
-local function get_formspec(custom_state)
-	local F = minetest.formspec_escape
-	local formspec = {
-		ch_core.formspec_header({
-			formspec_version = 6,
-			size = {12,12.75},
-			auto_background = true,
-		}),
-		"style[command,command_on;font=mono]"..
-		"item_image[0.25,0.25;1,1;"..custom_state.node_name_f.."]"..
-		"label[1.4,0.85;řídicí obvod ATC]"..
-		"button_exit[11,0.25;0.75,0.75;close;X]"..
-		"textarea[0.25,4.25;11.5,0.75;text_inside;nový text uvnitř (5 ř.):;"..F(custom_state.text_inside).."]"..
-		"textarea[0.25,5.5;11.5,0.75;text_outside;nový text venku (3 ř.):;"..F(custom_state.text_outside).."]"..
-		"field[0.25,6.75;3,0.75;line;nová linka:;"..F(custom_state.line).."]"..
-		"field[0.25,8;3,0.75;routingcode;nový směr. kód:;"..F(custom_state.routingcode).."]"..
-		"textarea[0.25,9.25;3,2.25;ars;vlaky\\, pro které platí:;"..F(custom_state.ars).."]"..
-		"label[3.5,6.55;nápověda:]"..
-		"tablecolumns[text;text]"..
-		"table[3.5,6.75;8.25,4.75;atc_help;S{0-20|M},Zpomalí/zrychlí na zadanou rychlost,SM,Zrychlí na maximální rychlost,"..
-		"B{0-20},Zpomalí na zadanou rychlost,W,Počká na dosažení cílové rychlosti,D{0-...},Počká zadaný počet sekund,"..
-		"R,Pokud vlak stojí\\, obrátí směr jízdy,OL,Otevře levé dveře,OR,Otevře pravé dveře,OC,Zavře všechny dveře,"..
-		"K,Vyhodí cestující (ne strojvedoucí/ho),Cpl,Počkat na náraz do vagonu a připojit ho,"..
-		"A0,Vypne ARS,A1,Zapne ARS,I+ {...}\\;,Vykonat\\, pokud jede vlak po směru šipky,"..
-		"I- {...}\\;,Nevykonat (ř.obvod je jednosměrný),I<{0-20} {...}\\;,Vykonat\\, je-li rychlost menší než uvedená"..
-		",,(analogicky pro op. <=\\, >= a >);]",
-		"button_exit[0.25,11.75;11.5,0.75;save;Uložit]"..
-		"tooltip[line;Nová linka na odjezdu. Prázdné pole = zachovat stávající linku. Pro smazání linky zadejte znak -]"..
-		"tooltip[routingcode;Nový směrový kód na odjezdu. Prázdné pole = zachovat stávající směrový kód. Pro smazání kódu vlaku zadejte znak -]"..
-		"tooltip[text_inside;Nastavit text uvnitř vlaku. Prázdné pole = zachovat stávající. - = smazat]"..
-		"tooltip[text_outside;Nastavit text vně vlaku. Prázdné pole = zachovat stávající. - = smazat]"..
-		"tooltip[ars;Seznam podmínek\\, z nichž musí vlak splnit alespoň jednu\\, aby zde zastavil:\nLN {linka}\nRC {směrovací kód}\n"..
-		"* = jakýkoliv vlak\n\\# komentář]",
-	}
-	if custom_state.mode < 3 then
-		table.insert(formspec, "field[0.25,1.75;11.5,0.75;command;program:;"..F(custom_state.command).."]")
-		if custom_state.mode == 2 then
-			table.insert(formspec, "field[0.25,3;11.5,0.75;command_on;program (při signálu):;"..F(custom_state.command_on).."]")
-		end
-	else
-		table.insert(formspec, "field[0.25,1.75;11.5,0.75;channel;"..attrans("Digiline channel")..";"..F(custom_state.channel).."]")
-	end
-	return table.concat(formspec)
-end
-
-local function limit_text(t, limit)
-	local tbl = t:split("\n")
-	if #tbl <= limit then
-		return t
-	else
-		for i = #t, limit + 1, -1 do
-			tbl[i] = nil
-		end
-		return table.concat(tbl, "\n")
-	end
-end
-
-local function formspec_callback(custom_state, player, formname, fields)
-	local pos = custom_state.pos
-	if advtrains.is_protected(pos, player:get_player_name()) then
-		minetest.record_protection_violation(pos, player:get_player_name())
-		return
-	end
-
-	if fields.command ~= nil then custom_state.command = fields.command end
-	if fields.command_on ~= nil then custom_state.command_on = fields.command_on end
-	if fields.line ~= nil then custom_state.line = fields.line end
-	if fields.routingcode ~= nil then custom_state.routingcode = fields.routingcode end
-	if fields.text_inside ~= nil then custom_state.text_inside = fields.text_inside end
-	if fields.text_outside ~= nil then custom_state.text_outside = fields.text_outside end
-	if fields.ars ~= nil then custom_state.ars = fields.ars end
-	if fields.channel ~= nil then custom_state.channel = fields.channel end
-
-	local meta=minetest.get_meta(pos)
-	if meta then
-		if not fields.save then 
-			--[[--maybe only the dropdown changed
-			if fields.mode then
-				meta:set_string("mode", idxtrans[fields.mode])
-				if fields.mode=="digiline" then
-					meta:set_string("infotext", attrans("ATC controller, mode @1\nChannel: @2", fields.mode, meta:get_string("command")) )
-				else
-					meta:set_string("infotext", attrans("ATC controller, mode @1\nCommand: @2", fields.mode, meta:get_string("command")) )
-				end
-				meta:set_string("formspec", atc.get_atc_controller_formspec(pos, meta))
-			end]]--
-			return
-		end
-		if custom_state.ars == "" then custom_state.ars = "*" end
-		--meta:set_string("mode", idxtrans[fields.mode])
-		meta:set_string("command", custom_state.command)
-		--meta:set_string("command_on", fields.command_on)
-		meta:set_string("channel", custom_state.channel)
-		meta:set_string("line", custom_state.line)
-		meta:set_string("routingcode", custom_state.routingcode)
-		meta:set_string("text_inside", limit_text(custom_state.text_inside, 5))
-		meta:set_string("text_outside", limit_text(custom_state.text_outside, 3))
-		meta:set_string("ars", custom_state.ars)
-		--if fields.mode=="digiline" then
-		--	meta:set_string("infotext", attrans("ATC controller, mode @1\nChannel: @2", fields.mode, meta:get_string("command")) )
-		--else
-		meta:set_string("infotext", attrans("ATC controller, mode @1\nCommand: @2", "-", meta:get_string("command")) )
-		--end
-		-- meta:set_string("formspec", atc.get_atc_controller_formspec(pos, meta))
-		
-		local pts=minetest.pos_to_string(pos)
-		local _, conns=advtrains.get_rail_info_at(pos, advtrains.all_tracktypes)
-		atc.controllers[pts]={command=fields.command}
-		if #advtrains.occ.get_trains_at(pos) > 0 then
-			atc.send_command(pos)
-		end
+		meta:set_string("infotext", attrans("Unconfigured ATC controller"))
+		meta:set_string("formspec", atc.get_atc_controller_formspec(pos, meta))
 	end
 end
 
@@ -254,40 +121,75 @@ advtrains.atc_function = function(def, preset, suffix, rotation)
 				local pts=minetest.pos_to_string(pos)
 				atc.controllers[pts]=nil
 			end,
-			on_rightclick = function(pos, node, clicker, itemstack, pointed_thing)
-				if advtrains.is_protected(pos, clicker:get_player_name()) then
-					minetest.record_protection_violation(pos, clicker:get_player_name())
+			on_receive_fields = function(pos, formname, fields, player)
+				if advtrains.is_protected(pos, player:get_player_name()) then
+					minetest.record_protection_violation(pos, player:get_player_name())
 					return
 				end
-				local custom_state = get_custom_state(pos)
-				ch_core.show_formspec(clicker, "advtrains:atc", get_formspec(custom_state), formspec_callback, custom_state, {})
-			end,
-			advtrains = {
-				on_train_enter = function(pos, train_id, train, index)
-					if train.path_cn[index] ~= 1 then
-						return -- opposite direction
-					end
-					local meta = minetest.get_meta(pos)
-					if advtrains.interlocking ~= nil then
-						local ars = meta:get_string("ars")
-					 	ars = advtrains.interlocking.text_to_ars(ars) or {default = true}
-						if not (ars.default or advtrains.interlocking.ars_check_rule_match(ars, train)) then
-							return -- ARS does not match
-						end
+				local meta=minetest.get_meta(pos)
+				if meta then
+					if not fields.save then 
+						--[[--maybe only the dropdown changed
+						if fields.mode then
+							meta:set_string("mode", idxtrans[fields.mode])
+							if fields.mode=="digiline" then
+								meta:set_string("infotext", attrans("ATC controller, mode @1\nChannel: @2", fields.mode, meta:get_string("command")) )
+							else
+								meta:set_string("infotext", attrans("ATC controller, mode @1\nCommand: @2", fields.mode, meta:get_string("command")) )
+							end
+							meta:set_string("formspec", atc.get_atc_controller_formspec(pos, meta))
+						end]]--
+						return
 					end
-					local function apply_change(old_value, change)
-						if change == "-" then return nil elseif change == "" then return old_value else return change end
+					--meta:set_string("mode", idxtrans[fields.mode])
+					meta:set_string("command", fields.command)
+					--meta:set_string("command_on", fields.command_on)
+					meta:set_string("channel", fields.channel)
+					--if fields.mode=="digiline" then
+					--	meta:set_string("infotext", attrans("ATC controller, mode @1\nChannel: @2", fields.mode, meta:get_string("command")) )
+					--else
+					meta:set_string("infotext", attrans("ATC controller, mode @1\nCommand: @2", "-", meta:get_string("command")) )
+					--end
+					meta:set_string("formspec", atc.get_atc_controller_formspec(pos, meta))
+					
+					local pts=minetest.pos_to_string(pos)
+					local _, conns=advtrains.get_rail_info_at(pos, advtrains.all_tracktypes)
+					atc.controllers[pts]={command=fields.command}
+					if #advtrains.occ.get_trains_at(pos) > 0 then
+						atc.send_command(pos)
 					end
-					train.line = apply_change(train.line, meta:get_string("line"))
-					train.routingcode = apply_change(train.routingcode, meta:get_string("routingcode"))
-					train.text_inside = apply_change(train.text_inside, meta:get_string("text_inside"))
-					train.text_outside = apply_change(train.text_outside, meta:get_string("text_outside"))
+				end
+			end,
+			advtrains = {
+				on_train_enter = function(pos, train_id)
 					atc.send_command(pos, train_id)
 				end,
 			},
 		}
 end
 
+function atc.get_atc_controller_formspec(pos, meta)
+	local mode=tonumber(meta:get_string("mode")) or 1
+	local command=meta:get_string("command")
+	local command_on=meta:get_string("command_on")
+	local channel=meta:get_string("channel")
+	local formspec="size[8,6]"
+	--	"dropdown[0,0;3;mode;static,mesecon,digiline;"..mode.."]"
+	if mode<3 then
+		formspec=formspec
+			.."style[command;font=mono]"
+			.."field[0.8,1.5;7,1;command;"..attrans("Command")..";"..minetest.formspec_escape(command).."]"
+		if tonumber(mode)==2 then
+			formspec=formspec
+				.."style[command_on;font=mono]"
+				.."field[0.8,3;7,1;command_on;"..attrans("Command (on)")..";"..minetest.formspec_escape(command_on).."]"
+		end
+	else
+		formspec=formspec.."field[0.8,1.5;7,1;channel;"..attrans("Digiline channel")..";"..minetest.formspec_escape(channel).."]"
+	end
+	return formspec.."button_exit[0.5,4.5;7,1;save;"..attrans("Save").."]"
+end
+
 --from trainlogic.lua train step
 local matchptn={
 	["SM"]=function(id, train)
@@ -332,7 +234,7 @@ local matchptn={
 			advtrains.train_ensure_init(id, train)
 			-- no one minds if this failed... this shouldn't even be called without train being initialized...
 		else
-			atwarn(sid(id), attrans("ATC Reverse command warning: didn't reverse train, train moving!"))
+			atwarn(sid(id), attrans("ATC Reverse command warning: didn't reverse train, train moving."))
 		end
 		return 1
 	end,
@@ -344,11 +246,11 @@ local matchptn={
 	end,
 	["K"] = function(id, train)
 		if train.door_open == 0 then
-			atwarn(sid(id), attrans("ATC Kick command warning: Doors closed"))
+			atwarn(sid(id), attrans("ATC Kick command warning: doors are closed."))
 			return 1
 		end
 		if train.velocity > 0 then
-			atwarn(sid(id), attrans("ATC Kick command warning: Train moving"))
+			atwarn(sid(id), attrans("ATC Kick command warning: train moving."))
 			return 1
 		end
 		local tp = train.trainparts
@@ -377,6 +279,10 @@ local matchptn={
 		train.atc_wait_autocouple=true
 		return 3
 	end,
+	["G"]=function(id, train)
+		train.atc_wait_signal=true
+		return 1
+	end,
 }
 
 eval_conditional = function(command, arrow, speed)
@@ -474,7 +380,8 @@ function atc.execute_atc_command(id, train)
 			train.atc_command=string.sub(command, patlen+1)
 			if train.atc_delay<=0
 				and not train.atc_wait_finish
-				and not train.atc_wait_autocouple then
+				and not train.atc_wait_autocouple
+				and not train.atc_wait_signal then
 				--continue (recursive, cmds shouldn't get too long, and it's a end-recursion.)
 				atc.execute_atc_command(id, train)
 			end
diff --git a/advtrains/copytool.lua b/advtrains/copytool.lua
index 0c1cdfe..c63551e 100644
--- a/advtrains/copytool.lua
+++ b/advtrains/copytool.lua
@@ -21,12 +21,12 @@ minetest.register_tool("advtrains:copytool", {
 			local node=minetest.get_node_or_nil(pointed_thing.under)
 			if not node then atprint("[advtrains]Ignore at placer position") return itemstack end
 			local nodename=node.name
-			if(not advtrains.is_track_and_drives_on(nodename, {default=true})) then
+			if(not advtrains.is_track(nodename)) then
 				atprint("no track here, not placing.")
 				return itemstack
 			end
 			if not minetest.check_player_privs(placer, {train_operator = true }) then
-				minetest.chat_send_player(pname, "You don't have the train_operator privilege.")
+				minetest.chat_send_player(pname, S("You do not have the @1 privilege.", "train_operator"))
 				return itemstack
 			end
 			if not minetest.check_player_privs(placer, {train_admin = true }) and minetest.is_protected(pointed_thing.under, placer:get_player_name()) then
@@ -38,7 +38,7 @@ minetest.register_tool("advtrains:copytool", {
 
 			local prevpos = advtrains.get_adjacent_rail(pointed_thing.under, tconns, plconnid, {default=true})
 			if not prevpos then
-				minetest.chat_send_player(pname, "The track you are trying to place the wagon on is not long enough!")
+				minetest.chat_send_player(pname, attrans("The track you are trying to place the wagon on is not long enough."))
 				return
 			end
 
@@ -49,12 +49,12 @@ minetest.register_tool("advtrains:copytool", {
 			end
 			local clipboard = meta:get_string("clipboard")
 			if (clipboard == "") then
-				minetest.chat_send_player(pname, "The clipboard is empty.");
+				minetest.chat_send_player(pname, attrans("The clipboard is empty."));
 				return
 			end
 			clipboard = minetest.deserialize(clipboard)
 			if (clipboard.wagons == nil) then
-				minetest.chat_send_player(pname, "The clipboard is empty.");
+				minetest.chat_send_player(pname, attrans("The clipboard is empty."));
 				return
 			end
 
@@ -71,7 +71,7 @@ minetest.register_tool("advtrains:copytool", {
 			local train = advtrains.trains[id]
 			train.off_track = train.end_index<train.path_trk_b
 			if (train.off_track) then
-				minetest.chat_send_player(pname, "Back of train would end up off track, cancelling.")
+				minetest.chat_send_player(pname, attrans("Back of train would end up off track, cancelling."))
 				advtrains.remove_train(id)
 				return
 			end
@@ -89,19 +89,19 @@ minetest.register_tool("advtrains:copytool", {
 
 		local le = pointed_thing.ref:get_luaentity()
 		if (le == nil) then
-			minetest.chat_send_player(user:get_player_name(), "No such lua entity!")
+			minetest.chat_send_player(user:get_player_name(), attrans("No such lua entity."))
 			return
 		end
 
 		local wagon = advtrains.wagons[le.id]
 		if (not (le.id and advtrains.wagons[le.id])) then
-			minetest.chat_send_player(user:get_player_name(), string.format("No such wagon: %s", le.id))
+			minetest.chat_send_player(user:get_player_name(), attrans("No such wagon: @1.", le.id))
 			return
 		end
 
 		local train = advtrains.trains[wagon.train_id]
 		if (not train) then
-			minetest.chat_send_player(user:get_player_name(), string.format("No such train: %s", wagon.train_id))
+			minetest.chat_send_player(user:get_player_name(), attrans("No such train: @1.", wagon.train_id))
 			return
 		end
 
@@ -177,7 +177,7 @@ minetest.register_tool("advtrains:copytool", {
 			return
 		end
 		meta:set_string("clipboard", minetest.serialize(clipboard))
-		minetest.chat_send_player(user:get_player_name(), attrans("Train copied!"))
+		minetest.chat_send_player(user:get_player_name(), attrans("Train copied."))
 		return itemstack
 	end
 })
diff --git a/advtrains/couple.lua b/advtrains/couple.lua
index a4355ca..a561b06 100644
--- a/advtrains/couple.lua
+++ b/advtrains/couple.lua
@@ -28,6 +28,20 @@ end
 advtrains.register_coupler_type("chain", attrans("Buffer and Chain Coupler"))
 advtrains.register_coupler_type("scharfenberg", attrans("Scharfenberg Coupler"))
 
+for _, name in pairs {"couple", "decouple"} do
+	local t = {}
+	local function reg(f)
+		table.insert(t, f)
+	end
+	local function cb(...)
+		for _, f in ipairs(t) do
+			f(...)
+		end
+	end
+	advtrains["te_registered_on_" .. name] = t
+	advtrains["te_register_on_" .. name] = reg
+	advtrains["te_run_callbacks_on_" .. name] = cb
+end
 
 local function create_couple_entity(pos, train1, t1_is_front, train2, t2_is_front)
 	local id1 = train1.id
@@ -79,8 +93,9 @@ function advtrains.train_check_couples(train)
 	end
 	if not train.cpl_front then
 		-- recheck front couple
-		local front_trains, pos = advtrains.occ.get_occupations(train, atround(train.index) + CPL_CHK_DST)
+		local pos = advtrains.path_get(train, atround(train.index) + CPL_CHK_DST)
 		if advtrains.is_node_loaded(pos) then -- if the position is loaded...
+			local front_trains = advtrains.occ.reverse_lookup_sel(pos, "in_train")
 			for tid, idx in pairs(front_trains) do
 				local other_train = advtrains.trains[tid]
 				if not advtrains.train_ensure_init(tid, other_train) then
@@ -109,8 +124,9 @@ function advtrains.train_check_couples(train)
 	end
 	if not train.cpl_back then
 		-- recheck back couple
-		local back_trains, pos = advtrains.occ.get_occupations(train, atround(train.end_index) - CPL_CHK_DST)
+		local pos = advtrains.path_get(train, atround(train.end_index) - CPL_CHK_DST)
 		if advtrains.is_node_loaded(pos) then -- if the position is loaded...
+			local back_trains = advtrains.occ.reverse_lookup_sel(pos, "in_train")
 			for tid, idx in pairs(back_trains) do
 				local other_train = advtrains.trains[tid]
 				if not advtrains.train_ensure_init(tid, other_train) then
@@ -182,8 +198,8 @@ end
 function advtrains.safe_couple_trains(train1, t1_is_front, train2, t2_is_front, pname)
 
 	if pname and not minetest.check_player_privs(pname, "train_operator") then
-		   minetest.chat_send_player(pname, "Missing train_operator privilege")
-		   return false
+		minetest.chat_send_player(pname, S("You are not allowed to couple trains without the train_operator privilege."))
+		return false
 	end
 
 	local wck_t1, wck_t2
@@ -225,6 +241,15 @@ function advtrains.couple_trains(init_train, invert_init_train, stat_train, stat
 	local stp = stat_train.trainparts
 	local stat_wagoncnt = #stp
 	local stat_trainlen = stat_train.trainlen -- save the train length of stat train, to be added to index
+	
+	-- sanity check, prevent coupling if train would be longer than 20 after coupling
+	local tot_len = init_wagoncnt + stat_wagoncnt
+	if tot_len > advtrains.TRAIN_MAX_WAGONS then
+		atwarn("Cannot couple",stat_train.id,"and",init_train.id,"- train would have length",tot_len,"which is above the limit of",advtrains.TRAIN_MAX_WAGONS)
+		return
+	end
+
+	advtrains.te_run_callbacks_on_couple(init_train, stat_train)
 
 	if stat_train_opposite then
 		-- insert wagons in inverse order and set their wagon_flipped state
@@ -310,7 +335,7 @@ function advtrains.check_matching_coupler_types(t1, t1_front, t2, t2_front)
 	--atdebug("CMCT: t1",t1_cplt,"t2",t2_cplt,"")
 
 	-- if at least one of the trains has no couplers table, it always couples (fallback behavior and mode for universal shunters)
-	if not t1_cplt or not t2_cplt then
+	if minetest.settings:get_bool("advtrains_universal_couplers", false) or not t1_cplt or not t2_cplt then
 		return true
 	end
 
@@ -326,11 +351,11 @@ function advtrains.check_matching_coupler_types(t1, t1_front, t2, t2_front)
 	for typ,_ in pairs(t1_cplt) do
 		table.insert(t1_cplhr, advtrains.coupler_types[typ] or typ)
 	end
-	if #t1_cplhr==0 then t1_cplhr[1]=attrans("<none>") end
+	if #t1_cplhr==0 then t1_cplhr[1]=attrans("<No coupler>") end
 	for typ,_ in pairs(t2_cplt) do
 		table.insert(t2_cplhr, advtrains.coupler_types[typ] or typ)
 	end
-	if #t2_cplhr==0 then t2_cplhr[1]=attrans("<none>") end
+	if #t2_cplhr==0 then t2_cplhr[1]=attrans("<No coupler>") end
 	return false, attrans("Can not couple: The couplers of the trains do not match (@1 and @2).", table.concat(t1_cplhr, ","), table.concat(t2_cplhr, ","))
 end
 
@@ -430,7 +455,7 @@ minetest.register_entity("advtrains:discouple", {
 				self.object:remove()
 				return
 			end
-			--getyaw seems to be a reliable method to check if an object is loaded...if it returns nil, it is not.
+			--get_yaw seems to be a reliable method to check if an object is loaded...if it returns nil, it is not.
 			if not self.wagon.object:get_yaw() then
 				self.object:remove()
 				return
diff --git a/advtrains/craft_items.lua b/advtrains/craft_items.lua
index 0e693eb..1188b64 100644
--- a/advtrains/craft_items.lua
+++ b/advtrains/craft_items.lua
@@ -6,7 +6,7 @@ core.register_craftitem("advtrains:boiler", {
 
  
 core.register_craftitem("advtrains:driver_cab", {
-	description = attrans("driver's cab"),
+	description = attrans("Driver's cab"),
 	inventory_image = "advtrains_driver_cab.png",
 })
 
diff --git a/advtrains/crafting.lua b/advtrains/crafting.lua
index f2bfaff..b6f01a6 100644
--- a/advtrains/crafting.lua
+++ b/advtrains/crafting.lua
@@ -22,6 +22,14 @@ minetest.register_craft({
 })
 --Wallmounted Signal
 minetest.register_craft({
+	output = 'advtrains:signal_wall_l_off 2',
+	recipe = {
+		{'default:steel_ingot', 'default:steel_ingot', 'dye:red'},
+		{'', 'default:steel_ingot', ''},
+		{'default:steel_ingot', 'default:steel_ingot', 'dye:dark_green'},
+	},
+})
+minetest.register_craft({
 	output = 'advtrains:signal_wall_r_off 2',
 	recipe = {
 		{'dye:red', 'default:steel_ingot', 'default:steel_ingot'},
@@ -29,6 +37,15 @@ minetest.register_craft({
 		{'dye:dark_green', 'default:steel_ingot', 'default:steel_ingot'},
 	},
 })
+minetest.register_craft({
+	output = 'advtrains:signal_wall_t_off 2',
+	recipe = {
+		{'default:steel_ingot', '', 'default:steel_ingot'},
+		{'default:steel_ingot', 'default:steel_ingot', 'default:steel_ingot'},
+		{'dye:dark_green', '', 'dye:red'},
+	},
+})
+
 
 --Wallmounted Signals can be converted into every orientation by shapeless crafting
 minetest.register_craft({
diff --git a/advtrains/debugitems.lua b/advtrains/debugitems.lua
index e672308..2236cba 100644
--- a/advtrains/debugitems.lua
+++ b/advtrains/debugitems.lua
@@ -51,3 +51,89 @@ minetest.register_chatcommand("atyaw",
 			end
         end,
 })
+	
+minetest.register_tool("advtrains:wagonpos_tester",
+{
+	description = "Wagon position tester",
+	groups = {cracky=1}, -- key=name, value=rating; rating=1..3.
+	inventory_image = "drwho_screwdriver.png",
+	wield_image = "drwho_screwdriver.png",
+	stack_max = 1,
+	range = 7.0,
+		
+	on_place = function(itemstack, placer, pointed_thing)
+	
+	end,
+	--[[
+	^ Shall place item and return the leftover itemstack
+	^ default: minetest.item_place ]]
+	on_use = function(itemstack, user, pointed_thing)
+		if pointed_thing.type=="node" then
+			local pos = pointed_thing.under
+			local trains = advtrains.occ.get_trains_at(pos)
+			for train_id, index in pairs(trains) do
+				local wagon_num, wagon_id, wagon_data, offset_from_center = advtrains.get_wagon_at_index(train_id, index)
+				if wagon_num then
+					atdebug(wagon_num, wagon_id, offset_from_center)
+				end
+			end
+		end
+	end,
+}
+)
+
+
+local function trackitest(initial_pos, initial_connid)
+	local ti, pos, connid, ok
+	ti = advtrains.get_track_iterator(initial_pos, initial_connid, 500, true)
+	atdebug("Starting at pos:",initial_pos,initial_connid)
+	while ti:has_next_branch() do
+		pos, connid = ti:next_branch() -- in first iteration, this will be the node at initial_pos. In subsequent iterations this will be the switch node from which we are branching off
+		atdebug("Next Branch:",pos, connid)
+		ok = true
+		while ok do
+			ok, pos, connid = ti:next_track()
+			atdebug("Next Track:", ok, pos, connid)
+		end
+	end
+	atdebug("End of traverse. Visited: ",table.concat(ti.visited, ","))
+end
+
+minetest.register_tool("advtrains:trackitest",
+{
+	description = "Track Iterator Tester (leftclick conn 1, rightclick conn 2)",
+	groups = {cracky=1}, -- key=name, value=rating; rating=1..3.
+	inventory_image = "advtrains_track_swlcr_45.png",
+	wield_image = "advtrains_track_swlcr_45.png",
+	stack_max = 1,
+	range = 7.0,
+		
+	on_place = function(itemstack, placer, pointed_thing)
+		if pointed_thing.type ~= "node" then return end
+		trackitest(pointed_thing.under, 2)
+	end,
+	on_use = function(itemstack, user, pointed_thing)
+		if pointed_thing.type ~= "node" then return end
+		trackitest(pointed_thing.under, 1)
+	end,
+}
+)
+
+minetest.register_chatcommand("at_trackdef_audit",
+	{
+        params = "", 
+        description = "Performs an audit of all track definitions currently loaded and checks for potential problems", 
+        func = function(name, param)
+			for name, ndef in pairs(minetest.registered_nodes) do
+				--TODO finish this!
+				if ndef.at_conns then
+					-- check if conn_map is there and if it has enough entries
+					if #ndef.at_conns > 2 then
+						if #ndef.at_conn_map < #ndef.at_conns then
+							atwarn("AUDIT: Node",name,"- Not enough connmap entries! Check ndef:",ndef)
+						end
+					end
+				end
+			end
+        end,
+})
diff --git a/advtrains/formspec.lua b/advtrains/formspec.lua
new file mode 100644
index 0000000..8894354
--- /dev/null
+++ b/advtrains/formspec.lua
@@ -0,0 +1,111 @@
+local sformat = string.format
+local fsescape = minetest.formspec_escape
+
+local function make_list(entries)
+	local t = {}
+	for k, v in ipairs(entries) do
+		t[k] = fsescape(v)
+	end
+	return table.concat(t, ",")
+end
+
+local function S_wrapper(f, i0)
+	return function(...)
+		local args = {...}
+		args[i0] = attrans(unpack(args,i0))
+		return f(unpack(args,1,i0))
+	end
+end
+
+local function f_button(x, y, w, id, text)
+	return sformat("button[%f,%f;%f,0.75;%s;%s]", x, y, w, id, text)
+end
+
+local function f_checkbox(x, y, name, selected, label)
+	return sformat("checkbox[%f,%f;%s;%s;%s]", x, y+0.25, name, label, selected and "true" or "false")
+end
+
+local function f_button_exit(x, y, w, id, text)
+	return sformat("button_exit[%f,%f;%f,0.75;%s;%s]", x, y, w, id, text)
+end
+
+local function f_dropdown(x, y, w, id, entries, sel, indexed)
+	return sformat("dropdown[%f,%f;%f,0.75;%s;%s;%d%s]",
+		x, y, w, id, make_list(entries),
+		sel or 1,
+		indexed and ";true" or "")
+end
+
+local function f_image_button(x, y, w, h, texture, id, label, noclip, drawborder, pressed)
+	local st = {string.format("%f,%f;%f,%f;%s;%s;%s", x, y, w, h, fsescape(texture), fsescape(id), fsescape(label))}
+	if pressed then
+		st[#st+1] = tostring(noclip or false)
+		st[#st+1] = tostring(drawborder or false)
+		st[#st+1] = fsescape(pressed)
+	end
+	return sformat("image_button[%s]", table.concat(st, ";"))
+end
+
+local function f_image_button_exit(x, y, w, h, texture, id, label)
+	local st = {string.format("%f,%f;%f,%f;%s;%s;%s", x, y, w, h, fsescape(texture), fsescape(id), fsescape(label))}
+	return sformat("image_button_exit[%s]", table.concat(st, ";"))
+end
+
+local function f_label(x, y, text)
+	return sformat("label[%f,%f;%s]", x, y+0.25, fsescape(text))
+end
+
+local function f_field_aux(x, y, w, id, default)
+	return sformat("field[%f,%f;%f,0.75;%s;;%s]", x, y, w, id, default)
+end
+
+local function f_field(x, y, w, id, label, default)
+	return f_label(x, y-0.5, label) .. f_field_aux(x, y, w, id, default)
+end
+
+local function f_tabheader(x, y, w, h, id, entries, sel, transparent, border)
+	local st = {string.format("%f,%f",x, y)}
+	if h then
+		if w then
+			st[#st+1] = string.format("%f,%f", w, h)
+		else
+			st[#st+1] = tostring(h)
+		end
+	end
+	st[#st+1] = tostring(id)
+	st[#st+1] = make_list(entries)
+	st[#st+1] = tostring(sel)
+	if transparent ~= nil then
+		st[#st+1] = tostring(transparent)
+		if border ~= nil then
+			st[#st+1] = tostring(border)
+		end
+	end
+	return string.format("tabheader[%s]", table.concat(st, ";"))
+end
+
+local function f_textlist(x, y, w, h, id, entries, sel, transparent)
+	local st = {string.format("%f,%f;%f,%f;%s;%s", x, y, w, h, id, make_list(entries))}
+	if sel then
+		st[#st+1] = tostring(sel)
+		st[#st+1] = tostring(transparent or false)
+	end
+	return string.format("textlist[%s]", table.concat(st, ";"))
+end
+
+return {
+	button = f_button,
+	S_button = S_wrapper(f_button, 5),
+	checkbox = f_checkbox,
+	S_checkbox = S_wrapper(f_checkbox, 5),
+	button_exit = f_button_exit,
+	S_button_exit = S_wrapper(f_button_exit, 5),
+	dropdown = f_dropdown,
+	field = f_field,
+	image_button = f_image_button,
+	image_button_exit = f_image_button_exit,
+	label = f_label,
+	S_label = S_wrapper(f_label, 3),
+	tabheader = f_tabheader,
+	textlist = f_textlist,
+}
diff --git a/advtrains/helpers.lua b/advtrains/helpers.lua
index 33950ec..1ed5a7e 100644
--- a/advtrains/helpers.lua
+++ b/advtrains/helpers.lua
@@ -293,18 +293,19 @@ function advtrains.conn_matches_to(conn, other_conns)
 end
 
 -- Going from the rail at pos (does not need to be rounded) along connection with id conn_idx, if there is a matching rail, return it and the matching connid
--- returns: <adjacent pos>, <conn index of adjacent>, <my conn index>, <railheight of adjacent>
+-- returns: <adjacent pos>, <conn index of adjacent>, <my conn index>, <railheight of adjacent>, (adjacent conns table), (adjacent connmap table)
 -- parameter this_conns_p is connection table of this rail and is optional, is determined by get_rail_info_at if not provided.
-function advtrains.get_adjacent_rail(this_posnr, this_conns_p, conn_idx, drives_on)
+function advtrains.get_adjacent_rail(this_posnr, this_conns_p, conn_idx)
 	local this_pos = advtrains.round_vector_floor_y(this_posnr)
 	local this_conns = this_conns_p
+	local _
 	if not this_conns then
 		_, this_conns = advtrains.get_rail_info_at(this_pos)
 	end
 	if not conn_idx then
 		for coni, _ in ipairs(this_conns) do
-			local adj_pos, adj_conn_idx, _, nry, nco = advtrains.get_adjacent_rail(this_pos, this_conns, coni)
-			if adj_pos then return adj_pos,adj_conn_idx,coni,nry, nco end
+			local adj_pos, adj_conn_idx, _, nry, nco, ncm = advtrains.get_adjacent_rail(this_pos, this_conns, coni)
+			if adj_pos then return adj_pos,adj_conn_idx,coni,nry, nco, ncm end
 		end
 		return nil
 	end
@@ -318,34 +319,46 @@ function advtrains.get_adjacent_rail(this_posnr, this_conns_p, conn_idx, drives_
 		adj_pos.y = adj_pos.y + 1
 	end
 	
-	local nextnode_ok, nextconns, nextrail_y=advtrains.get_rail_info_at(adj_pos, drives_on)
+	local nextnode_ok, nextconns, nextrail_y, nextconnmap=advtrains.get_rail_info_at(adj_pos)
 	if not nextnode_ok then
 		adj_pos.y = adj_pos.y - 1
 		conn_y = conn_y + 1
-		nextnode_ok, nextconns, nextrail_y=advtrains.get_rail_info_at(adj_pos, drives_on)
+		nextnode_ok, nextconns, nextrail_y, nextconnmap=advtrains.get_rail_info_at(adj_pos)
 		if not nextnode_ok then
 			return nil
 		end
 	end
 	local adj_connid = advtrains.conn_matches_to({c=conn.c, y=conn_y}, nextconns)
 	if adj_connid then
-		return adj_pos, adj_connid, conn_idx, nextrail_y, nextconns
+		return adj_pos, adj_connid, conn_idx, nextrail_y, nextconns, nextconnmap
 	end
 	return nil
 end
 
 -- when a train enters a rail on connid 'conn', which connid will it go out?
--- nconns: number of connections in connection table:
--- 2 = straight rail; 3 = turnout, 4 = crossing, 5 = three-way turnout (5th entry is a stub)
+-- Since 2.5: This mapping is contained in the conn_map table in the node definition!
 -- returns: connid_out
-local connlku={[2]={2,1}, [3]={2,1,1}, [4]={2,1,4,3}, [5]={2,1,1,1}}
-function advtrains.get_matching_conn(conn, nconns)
-	return connlku[nconns][conn]
+function advtrains.get_matching_conn(conn, conn_map)
+	if tonumber(conn_map) then
+		error("Legacy call to get_matching_conn! Instead of nconns, conn_map needs to be provided!")
+	end
+	if not conn_map then
+		--OK for two-conn rails, just return the other
+		if conn==1 then return 2 end
+		if conn==2 then return 1 end
+		error("get_matching_conn: For connid >=3, conn_map must not be nil!")
+	end
+	local cout = conn_map[conn]
+	if not cout then
+		error("get_matching_conn: Connid "..conn.." not found in conn_map which is "..atdump(conn_map))
+	end
+	return cout
 end
 
-function advtrains.random_id()
+function advtrains.random_id(lenp)
 	local idst=""
-	for i=0,5 do
+	local len = lenp or 6
+	for i=1,len do
 		idst=idst..(math.random(0,9))
 	end
 	return idst
@@ -524,3 +537,149 @@ function advtrains.yaw_equals(yaw1, yaw2)
 		return yaw1 == yaw2
 	end
 end
+
+
+-- TrackIterator interface --
+
+-- Metatable:
+local trackiter_mt = {
+	-- Internal State:
+	-- branches: A list of {pos, connid, limit} for where to restart
+	-- pos: The *next* position that the track iterator will return
+	-- bconnid: The connid of the connection of the rail at pos that points backward
+	-- tconns: The connections of the rail at pos
+	-- limit: the current limit
+	-- visited: a key-boolean table of already visited rails
+	
+	-- get whether there are still unprocessed branches
+	has_next_branch = function(self)
+		return #self.branches > 0
+	end,
+	-- go to the next unprocessed branch
+	-- returns track_pos, track_connid of the switch/crossing node where the track branches off
+	next_branch = function(self)
+		local br = table.remove(self.branches, 1)
+		-- Advance internal state
+		local adj_pos, adj_connid, _, _, adj_conns, adj_connmap = advtrains.get_adjacent_rail(br.pos, nil, br.connid)
+		self.pos = adj_pos
+		self.bconnid = adj_connid
+		self.tconns = adj_conns
+		self.tconnmap = adj_connmap
+		self.limit = br.limit - 1
+		self.visited[advtrains.encode_pos(br.pos)] = true
+		self.last_track_already_visited = false
+		return br.pos, br.connid
+	end,
+	-- get the next track along the current branch,
+	-- potentially adding branching tracks to the unprocessed branches list
+	-- returns track_pos, track_connid, track_backwards_connid
+	-- On error, returns nil, reason; reason is one of "track_end", "limit_hit", "already_visited"
+	next_track = function(self)
+		if self.last_track_already_visited then
+			-- see comment below
+			return nil, "already_visited"
+		end
+		local pos = self.pos
+		if not pos then
+			-- last run found track end. Return false
+			return false, "track_end"
+		end
+		-- if limit hit, return nil to signal this
+		if self.limit <= 0 then
+			return nil, "limit_hit"
+		end
+		-- select next conn (main conn to follow is the associated connection)
+		local old_bconnid = self.bconnid
+		local mconnid = advtrains.get_matching_conn(self.bconnid, self.tconnmap)
+		if self.visited[advtrains.encode_pos(pos)] then
+			-- node was already seen
+			-- Due to special requirements for the track section updater, return this first already visited track once
+			-- but do not process any further rails on this branch
+			-- The next call will then throw already_visited error
+			self.last_track_already_visited = true
+			return pos, mconnid, old_bconnid
+		end
+		-- If there are more connections, add these to branches
+		for nconnid,_ in ipairs(self.tconns) do
+			if nconnid~=mconnid and nconnid~=self.bconnid then
+				table.insert(self.branches, {pos = self.pos, connid = nconnid, limit=self.limit})
+			end
+		end
+		-- Advance internal state
+		local adj_pos, adj_connid, _, _, adj_conns, adj_connmap = advtrains.get_adjacent_rail(pos, self.tconns, mconnid)
+		self.pos = adj_pos
+		self.bconnid = adj_connid
+		self.tconns = adj_conns
+		self.tconnmap = adj_connmap
+		self.limit = self.limit - 1
+		self.visited[advtrains.encode_pos(pos)] = true
+		self.last_track_already_visited = false
+		return pos, mconnid, old_bconnid
+	end,
+
+	add_branch = function(self, pos, connid)
+		table.insert(self.branches, {pos = pos, connid = connid, limit=self.limit})
+	end,
+
+	is_visited = function(self, pos)
+		return self.visited[advtrains.encode_pos(pos)]
+	end,
+}
+
+-- Returns a new TrackIterator object
+
+-- Parameters:
+-- initial_pos: the initial track position of the track iterator
+-- initial_connid: the connection index in which to traverse. If nil, adds a "branch" for every connection of the track (traverse in all directions)
+-- limit: maximum distance from the start point after which the traverser stops
+-- follow_all: NOT IMPLEMENTED (supposed: if true, follows all branches at multi-connection tracks, even the ones pointing backwards or the crossing track on crossings. If false, follows only switches in driving direction.)
+
+-- Functions of the returned TrackIterator can be called via the Lua : notation, such as ti:next_track()
+-- If only the main track needs to be followed, use only the ti:next_track() function and do not call ti:next_branch().
+function advtrains.get_track_iterator(initial_pos, initial_connid, limit, follow_all)
+	local ti = {
+		visited = {}
+	}
+	if initial_connid then
+		ti.branches = { {pos = initial_pos, connid = initial_connid, limit=limit} }
+	else
+		-- get track info here
+		local node_ok, conns, rail_y=advtrains.get_rail_info_at(initial_pos)
+		assert(node_ok, "get_track_iterator called with non-track node!")
+		ti.branches = {}
+		for coni, _ in pairs(conns) do
+			table.insert(ti.branches, {pos = initial_pos, connid = coni, limit=limit})
+		end
+	end
+	ti.limit = limit -- safeguard if someone adds a branch before calling anything
+	setmetatable(ti, {__index=trackiter_mt})
+	return ti
+end
+
+--[[
+Example TrackIterator usage structure:
+
+local ti, pos, connid, ok
+ti = advtrains.get_track_iterator(initial_pos, initial_connid, 500, true)
+while ti:has_next_branch() do
+	pos, connid = ti:next_branch() -- in first iteration, this will be the node at initial_pos. In subsequent iterations this will be the switch node from which we are branching off
+	repeat
+		<do something with the track>
+		if <track satisfies an abort condition> then break end --for example, when traversing should stop at TCBs this can check if there is a tcb here
+		pos, connid = ti:next_track()
+	until not pos -- this stops the loop when either the track end is reached or the limit is hit
+	-- while loop continues with the next branch ( diverging branch of one of the switches/crossings) until no more are left
+end
+
+Example for walking only a single track (without branching):
+
+local ti, pos, connid, ok
+ti = advtrains.get_track_iterator(initial_pos, initial_connid, 500, true)
+
+pos, connid = ti:next_branch() -- this always needs to be done at least one time, and gets the track at initial_pos
+repeat
+	<do something with the track>
+	if <track satisfies an abort condition> then break end --for example, when traversing should stop at TCBs this can check if there is a tcb here
+	ok, pos, connid = ti:next_track()
+until not ok -- this stops the loop when either the track end is reached or the limit is hit
+]]
diff --git a/advtrains/init.lua b/advtrains/init.lua
index 688f2a5..f602c44 100644
--- a/advtrains/init.lua
+++ b/advtrains/init.lua
@@ -27,6 +27,9 @@ local has_luaautomation = minetest.get_modpath("advtrains_luaautomation")
 
 -- There is no need to support 0.4.x anymore given that the compatitability with it is already broken by 1bb1d825f46af3562554c12fba35a31b9f7973ff
 attrans = minetest.get_translator ("advtrains")
+function attrans_formspec(...)
+	return minetest.formspec_escape(attrans(...))
+end
 
 --advtrains
 advtrains = {trains={}, player_to_train_mapping={}}
@@ -51,6 +54,9 @@ advtrains.IGNORE_WORLD = false
 local NO_SAVE = false
 -- Do not save any data to advtrains save files
 
+advtrains.TRAIN_MAX_WAGONS = 20
+-- Limit on the maximum number of wagons that may be in a train
+
 -- ==========================================================================
 
 -- Use a global slowdown factor to slow down train movements. Now a setting
@@ -201,20 +207,27 @@ advtrains.meseconrules =
 
 advtrains.fpath=minetest.get_worldpath().."/advtrains"
 
+advtrains.poconvert = dofile(advtrains.modpath.."/poconvert.lua")
+advtrains.poconvert.from_flat("advtrains")
+attrans = minetest.get_translator("advtrains")
+
 advtrains.speed = dofile(advtrains.modpath.."/speed.lua")
+advtrains.formspec = dofile(advtrains.modpath.."/formspec.lua")
+advtrains.texture = dofile(advtrains.modpath.."/texture.lua")
 
 dofile(advtrains.modpath.."/path.lua")
 dofile(advtrains.modpath.."/trainlogic.lua")
 dofile(advtrains.modpath.."/trainhud.lua")
 dofile(advtrains.modpath.."/trackplacer.lua")
 dofile(advtrains.modpath.."/copytool.lua")
+dofile(advtrains.modpath.."/wagonprop_tool.lua")
 dofile(advtrains.modpath.."/tracks.lua")
+dofile(advtrains.modpath.."/track_reg_helper.lua")
 dofile(advtrains.modpath.."/occupation.lua")
 dofile(advtrains.modpath.."/atc.lua")
 dofile(advtrains.modpath.."/wagons.lua")
 dofile(advtrains.modpath.."/protection.lua")
 
-dofile(advtrains.modpath.."/trackdb_legacy.lua")
 dofile(advtrains.modpath.."/nodedb.lua")
 dofile(advtrains.modpath.."/couple.lua")
 
@@ -232,6 +245,9 @@ end
 
 dofile(advtrains.modpath.."/lzb.lua")
 
+if minetest.settings:get_bool("advtrains_register_debugitems") then
+	dofile(advtrains.modpath.."/debugitems.lua")
+end
 
 --load/save
 
@@ -414,6 +430,16 @@ function advtrains.load_version_4()
 		if il_save then
 			advtrains.interlocking.db.load(il_save)
 		end
+		
+		-- TODO 2.5.0 backwards compatibility fallback: Store the pre-v2.5.0 save file so that it can be reverted to if needed
+		local fallback_file = advtrains.fpath.."_interlocking.ls.pre250"
+		local file = io.open(fallback_file, "rb")
+		if file then
+			io.close(file)
+		else
+			atwarn("Backing up pre-2.5.0 version of Interlocking save file to",fallback_file," for potential downgrade to older versions")
+			os.rename(advtrains.fpath.."_interlocking.ls", fallback_file)
+		end
 	end
 	
 	--== load lines ==
@@ -473,8 +499,8 @@ advtrains.avt_save = function(remove_players_from_wagons)
 				"atc_brake_target", "atc_wait_finish", "atc_command", "atc_delay", "door_open",
 				"text_outside", "text_inside", "line", "routingcode",
 				"il_sections", "speed_restriction", "speed_restrictions_t", "is_shunt",
-				"points_split", "autocouple", "atc_wait_autocouple", "ars_disable",
-				"line_status",
+				"path_ori_cp", "autocouple", "atc_wait_autocouple", "ars_disable",
+				"staticdata", "line_status",
 			})
 			--then save it
 			tmp_trains[id]=v
@@ -748,6 +774,21 @@ minetest.register_chatcommand("at_whereis",
 			end
 		end,
 })
+minetest.register_chatcommand("at_tp",
+	{
+		params = "<train id>",
+		description = attrans("Teleports you to the position of the train with the given id"),
+		privs = {train_operator = true, teleport = true},
+		func = function(name,param)
+			local train = advtrains.trains[param]
+			if not train or not train.last_pos then
+				return false, "Train "..param.." does not exist or is invalid"
+			else
+				minetest.get_player_by_name(name):set_pos(train.last_pos)
+				return true, "Teleporting to train "..param
+			end
+		end,
+})
 minetest.register_chatcommand("at_disable_step",
 	{
         params = "<yes/no>", 
@@ -769,6 +810,16 @@ minetest.register_chatcommand("at_disable_step",
         end,
 })
 
+minetest.register_chatcommand("at_status",
+	{
+        params = "", 
+        description = attrans("Print advtrains status info"),
+        privs = {train_operator = true},
+        func = function(name, param)
+			return true, advtrains.print_concat_table({"Advtrains Status: no_action",no_action,"slowdown",advtrains.global_slowdown,"(log",math.log(advtrains.global_slowdown),")"})
+        end,
+})
+
 advtrains.is_no_action = function()
 	return no_action
 end
diff --git a/advtrains/locale/README.md b/advtrains/locale/README.md
new file mode 120000
index 0000000..61e473c
--- /dev/null
+++ b/advtrains/locale/README.md
@@ -0,0 +1 @@
+../po/README.md
\ No newline at end of file
diff --git a/advtrains/lzb.lua b/advtrains/lzb.lua
index 64e4553..116777c 100644
--- a/advtrains/lzb.lua
+++ b/advtrains/lzb.lua
@@ -29,8 +29,9 @@ The LZB subsystem keeps track of "checkpoints" the train will pass in the future
 To perform 2, it populates the train.path_speed table which is handled along with the path subsystem.
 This table is used in trainlogic.lua/train_step_b() and applied to the velocity calculations.
 
-Note: in contrast to node enter callbacks, which are called when the train passes the .5 index mark, LZB callbacks are executed on passing the .0 index mark!
-If an LZB checkpoint has speed 0, the train will still enter the node (the enter callback will be called), but will stop at the 0.9 index mark (for details, see SLOW_APPROACH in trainlogic.lua)
+Note: As of 2024-11-25, node enter callbacks as well as LZB callbacks are executed on passing the .0 index mark!
+If an LZB checkpoint has speed 0, it will stop at the 0.9 index mark (for details, see SLOW_APPROACH in trainlogic.lua) and will not enter the node.
+(previous behavior: node enter callback was called at .5 index mark)
 
 The start point for the LZB traverser (and thus the first node that will receive an approach callback) is floor(train.index) + 1. This means, once the LZB checkpoint callback has fired,
 this path node will not receive any further approach callbacks for the same approach situation
@@ -48,7 +49,7 @@ local params = {
 	ZONE_HOLD  =  5, -- added on top of ZONE_ROLL
 	ZONE_VSLOW =  3, -- When speed is <2, still allow accelerating
 
-	DST_FACTOR =  1.5,
+	DST_FACTOR =  3,--1.5,
 
 	SHUNT_SPEED_MAX = advtrains.SHUNT_SPEED_MAX,
 }
@@ -264,7 +265,8 @@ end
 advtrains.te_register_on_new_path(function(id, train)
 	advtrains.lzb_invalidate(train)
 	-- Taken care of in pre-move hook (see train_step_b)
-	--look_ahead(id, train)
+	-- 2025-01-28 - do anyway, there seems to be an issue
+	look_ahead(id, train)
 end)
 
 advtrains.te_register_on_invalidate_ahead(function(id, train, start_idx)
diff --git a/advtrains/nodedb.lua b/advtrains/nodedb.lua
index b6521d5..408ff5d 100644
--- a/advtrains/nodedb.lua
+++ b/advtrains/nodedb.lua
@@ -212,6 +212,10 @@ function ndb.get_node(pos)
 	end
 	return n
 end
+function ndb.get_ndef(pos)
+	local n=ndb.get_node_or_nil(pos)
+	return n and minetest.registered_nodes[n.name]
+end
 function ndb.get_node_raw(pos)
 	local cid=ndbget(pos.x, pos.y, pos.z)
 	if cid then
@@ -264,23 +268,23 @@ end
 --get_node with pseudoload. now we only need track data, so we can use the trackdb as second fallback
 --nothing new will be saved inside the trackdb.
 --returns:
---true, conn1, conn2, rely1, rely2, railheight   in case everything's right.
+--true, conns, railheight, connmap   in case everything's right.
 --false  if it's not a rail or the train does not drive on this rail, but it is loaded or
 --nil    if the node is neither loaded nor in trackdb
 --the distraction between false and nil will be needed only in special cases.(train initpos)
-function advtrains.get_rail_info_at(pos, drives_on)
+function advtrains.get_rail_info_at(pos)
 	local rdp=advtrains.round_vector_floor_y(pos)
 	
 	local node=ndb.get_node_or_nil(rdp)
 	if not node then return end
 	
 	local nodename=node.name
-	if(not advtrains.is_track_and_drives_on(nodename, drives_on)) then
+	if(not advtrains.is_track(nodename)) then
 		return false
 	end
-	local conns, railheight, tracktype=advtrains.get_track_connections(node.name, node.param2)
+	local conns, railheight, connmap = advtrains.get_track_connections(node.name, node.param2)
 	
-	return true, conns, railheight
+	return true, conns, railheight, connmap
 end
 
 local IGNORE_WORLD = advtrains.IGNORE_WORLD
diff --git a/advtrains/occupation.lua b/advtrains/occupation.lua
index db39991..20a986e 100644
--- a/advtrains/occupation.lua
+++ b/advtrains/occupation.lua
@@ -86,10 +86,11 @@ end
 
 function o.set_item(train_id, pos, idx)
 	local t = occgetcreate(pos)
+	assert(idx)
 	local i = 1
 	while t[i] do
-		if t[i]==train_id then
-			break
+		if t[i]==train_id and t[i+1]==idx then
+			return
 		end
 		i = i + 2
 	end
@@ -98,25 +99,30 @@ function o.set_item(train_id, pos, idx)
 end
 
 
-function o.clear_item(train_id, pos)
+function o.clear_all_items(train_id, pos)
 	local t = occget(pos)
 	if not t then return end
 	local i = 1
-	local moving = false
 	while t[i] do
 		if t[i]==train_id then
-			if moving then
-				-- if, for some occasion, there should be a duplicate entry, erase this one too
-				atwarn("Duplicate occupation entry at",pos,"for train",train_id,":",t)
-				i = i - 2
-			end
-			moving = true
+			table.remove(t, i)
+			table.remove(t, i)
+		else
+			i = i + 2
 		end
-		if moving then
-			t[i]   = t[i+2]
-			t[i+1] = t[i+3]
+	end
+end
+function o.clear_specific_item(train_id, pos, index)
+	local t = occget(pos)
+	if not t then return end
+	local i = 1
+	while t[i] do
+		if t[i]==train_id and t[i+1]==index then
+			table.remove(t, i)
+			table.remove(t, i)
+		else
+			i = i + 2
 		end
-		i = i + 2
 	end
 end
 
@@ -143,64 +149,88 @@ function o.check_collision(pos, train_id)
 	return false
 end
 
--- Gets a mapping of train id's to indexes of trains that share this path item with this train
--- The train itself will not be included.
--- If the requested index position is off-track, returns {}.
--- returns (table with train_id->index), position
-function o.get_occupations(train, index)
-	local ppos, ontrack = advtrains.path_get(train, index)
-	if not ontrack then
-		atlog("Train",train.id,"get_occupations requested off-track",index)
-		return {}, ppos
-	end
+-- Gets a mapping of train id's to indexes of trains that have a path item at this position
+-- Note that the case where 2 or more indices are at a position only occurs if there is a track loop.
+-- returns (table with train_id->{index1, index2...})
+function o.reverse_lookup(ppos)
 	local pos = advtrains.round_vector_floor_y(ppos)
 	local t = occget(pos)
 	if not t then return {} end
 	local r = {}
 	local i = 1
-	local train_id = train.id
 	while t[i] do
-		if t[i]~=train_id then
-			r[t[i]] = t[i+1]
-		end
+		if not r[t[i]] then r[t[i]] = {} end
+		table.insert(r[t[i]], t[i+1])
 		i = i + 2
 	end
-	return r, pos
+	return r
 end
--- Gets a mapping of train id's to indexes of trains that stand or drive over
+
+-- Gets a mapping of train id's to indexes of trains that have a path item at this position.
+-- Quick variant: will only return one index per train (the latest one added)
 -- returns (table with train_id->index)
-function o.get_trains_at(ppos)
+function o.reverse_lookup_quick(ppos)
 	local pos = advtrains.round_vector_floor_y(ppos)
 	local t = occget(pos)
 	if not t then return {} end
 	local r = {}
 	local i = 1
 	while t[i] do
-		local train = advtrains.trains[t[i]]
-		local idx = t[i+1]
-		if train.end_index - 0.5 <= idx and idx <= train.index + 0.5 then
-			r[t[i]] = idx
-		end
+		r[t[i]] = t[i+1]
 		i = i + 2
 	end
 	return r
 end
 
--- Gets a mapping of train id's to indexes of trains that have a path
--- generated over this node
--- returns (table with train_id->index)
-function o.get_trains_over(ppos)
-	local pos = advtrains.round_vector_floor_y(ppos)
-	local t = occget(pos)
-	if not t then return {} end
+local OCC_CLOSE_PROXIMITY = 3
+-- Gets a mapping of train id's to index of trains that have a path item at this position. Selects at most one index based on a given heuristic, or even none if it does not match the heuristic criterion
+-- returns (table with train_id->index), position
+-- "in_train": first index that lies between train index and end index
+-- "train_at_node": first index where the train is standing on that node (like in_train but with +-0.5 added to index)
+-- "first_ahead": smallest index that is > current index
+-- "before_end"(default): smallest index that is > end index
+-- "close_proximity": within 3 indices close to the train index and end_index
+-- "any": just output the first index found and do not check further (also occurs if both "in_train" and "first_ahead" heuristics have failed
+function o.reverse_lookup_sel(pos, heuristic)
+	if not heuristic then heuristic = "before_end" end
+	local om = o.reverse_lookup(pos)
 	local r = {}
-	local i = 1
-	while t[i] do
-		local idx = t[i+1]
-		r[t[i]] = idx
-		i = i + 2
+	for tid, idxs in pairs(om) do
+		r[tid] = idxs[1]
+		if heuristic~="any" then
+			--must run a heuristic
+			--atdebug("reverse_lookup_sel is running heuristic for", pos,heuristic,"idxs",table.concat(idxs,","))
+			local otrn = advtrains.trains[tid]
+			advtrains.train_ensure_init(tid, otrn)
+			local h_value
+			for _,idx in ipairs(idxs) do
+				if heuristic == "first_ahead" and idx > otrn.index and (not h_value or h_value>idx) then
+					h_value = idx
+				end
+				if heuristic == "before_end" and idx > otrn.end_index and (not h_value or h_value>idx) then
+					h_value = idx
+				end
+				if heuristic == "in_train" and idx < otrn.index and idx > otrn.end_index then
+					h_value = idx
+				end
+				if heuristic == "train_at_node" and idx < (otrn.index+0.5) and idx > (otrn.end_index-0.5) then
+					h_value = idx
+				end
+				if heuristic == "close_proximity" and idx < (otrn.index + OCC_CLOSE_PROXIMITY) and idx > (otrn.end_index - OCC_CLOSE_PROXIMITY) then
+					h_value = idx
+				end
+			end
+			r[tid] = h_value
+			--atdebug(h_value,"chosen")
+		end
 	end
-	return r
+	return r, pos
+end
+-- Gets a mapping of train id's to indexes of trains that stand or drive over
+-- returns (table with train_id->index)
+function o.get_trains_at(ppos)
+	local pos = advtrains.round_vector_floor_y(ppos)
+	return o.reverse_lookup_sel(pos, "train_at_node")
 end
 
 advtrains.occ = o
diff --git a/advtrains/p_mesecon_iface.lua b/advtrains/p_mesecon_iface.lua
index 33fcecd..0426e2b 100644
--- a/advtrains/p_mesecon_iface.lua
+++ b/advtrains/p_mesecon_iface.lua
@@ -14,13 +14,11 @@ minetest.override_item("mesecons_switch:mesecon_switch_off", {
 		minetest.sound_play("mesecons_switch", {pos=pos})
 	end,
 	advtrains = {
-		getstate = "off",
-		setstate = function(pos, node, newstate)
-			if newstate=="on" then
-				advtrains.ndb.swap_node(pos, {name="mesecons_switch:mesecon_switch_on", param2=node.param2})
-				if advtrains.is_node_loaded(pos) then
-					mesecon.receptor_on(pos)
-				end
+		node_state = "off",
+		node_state_map = { on = "mesecons_switch:mesecon_switch_on", off = "mesecons_switch:mesecon_switch_off" },
+		node_on_switch_state = function(pos, new_node, old_state, new_state)
+			if advtrains.is_node_loaded(pos) then
+				mesecon.receptor_on(pos)
 			end
 		end,
 		on_updated_from_nodedb = function(pos, node)
@@ -41,16 +39,14 @@ minetest.override_item("mesecons_switch:mesecon_switch_on", {
 		minetest.sound_play("mesecons_switch", {pos=pos})
 	end,
 	advtrains = {
-		getstate = "on",
-		setstate = function(pos, node, newstate)
-			if newstate=="off" then
-				advtrains.ndb.swap_node(pos, {name="mesecons_switch:mesecon_switch_off", param2=node.param2})
-				if advtrains.is_node_loaded(pos) then
-					mesecon.receptor_off(pos)
-				end
+		node_state = "on",
+		node_state_map = { on = "mesecons_switch:mesecon_switch_on", off = "mesecons_switch:mesecon_switch_off" },
+		node_on_switch_state = function(pos, new_node, old_state, new_state)
+			if advtrains.is_node_loaded(pos) then
+				mesecon.receptor_off(pos)
 			end
 		end,
-		fallback_state = "off",
+		node_fallback_state = "off",
 		on_updated_from_nodedb = function(pos, node)
 			mesecon.receptor_on(pos)
 		end,
diff --git a/advtrains/passive.lua b/advtrains/passive.lua
index 156e846..59d2ea8 100644
--- a/advtrains/passive.lua
+++ b/advtrains/passive.lua
@@ -1,9 +1,5 @@
 -- passive.lua
--- API to passive components, as described in passive_api.txt of advtrains_luaautomation
--- This has been moved to the advtrains core in turn with the interlocking system,
--- to prevent a dependency on luaautomation.
-
-local deprecation_warned = {}
+-- Rework for advtrains 2.5: The passive API now uses the reworked node_state system. Please see the comment in tracks.lua
 
 function advtrains.getstate(parpos, pnode)
 	local pos
@@ -19,20 +15,8 @@ function advtrains.getstate(parpos, pnode)
 	local node=pnode or advtrains.ndb.get_node(pos)
 	local ndef=minetest.registered_nodes[node.name]
 	local st
-	if ndef and ndef.advtrains and ndef.advtrains.getstate then
-		 st=ndef.advtrains.getstate
-	elseif ndef and ndef.luaautomation and ndef.luaautomation.getstate then
-		if not deprecation_warned[node.name] then
-			minetest.log("warning", node.name.." uses deprecated definition of ATLATC functions in the 'luaautomation' field. Please move them to the 'advtrains' field!")
-		end
-		st=ndef.luaautomation.getstate
-	else
-		return nil
-	end
-	if type(st)=="function" then
-		return st(pos, node)
-	else
-		return st
+	if ndef and ndef.advtrains then
+		return ndef.advtrains.node_state
 	end
 end
 
@@ -45,31 +29,48 @@ function advtrains.setstate(parpos, newstate, pnode)
 	end
 	if type(pos)~="table" or (not pos.x or not pos.y or not pos.z) then
 		debug.sethook()
-		error("Invalid position supplied to getstate")
+		error("Invalid position supplied to setstate")
 	end
 	local node=pnode or advtrains.ndb.get_node(pos)
 	local ndef=minetest.registered_nodes[node.name]
-	local st
-	if ndef and ndef.advtrains and ndef.advtrains.setstate then
-		 st=ndef.advtrains.setstate
-	elseif ndef and ndef.luaautomation and ndef.luaautomation.setstate then
-		if not deprecation_warned[node.name] then
-			minetest.log("warning", node.name.." uses deprecated definition of ATLATC functions in the 'luaautomation' field. Please move them to the 'advtrains' field!")
-		end
-		st=ndef.luaautomation.setstate
-	else
-		return nil
+	
+	if not ndef or not ndef.advtrains then
+		return false, "missing_node_def"
+	end
+	local old_state = ndef.advtrains.node_state
+	
+	if old_state == newstate then
+		-- nothing needs to be done
+		return true
 	end
 	
+	if not ndef.advtrains.node_state_map then
+		return false, "missing_node_state_map"
+	end
+	local new_node_name = ndef.advtrains.node_state_map[newstate]
+	if not new_node_name then
+		return false, "no_such_state"
+	end
+	
+	-- prevent state switching when route lock or train is present
 	if advtrains.get_train_at_pos(pos) then
-		return false
+		return false, "train_here"
 	end
 	
-	if advtrains.interlocking and advtrains.interlocking.route.has_route_lock(minetest.pos_to_string(pos)) then
-		return false
+	if advtrains.interlocking and advtrains.interlocking.route.has_route_lock(advtrains.encode_pos(pos)) then
+		return false, "route_lock_here"
 	end
 	
-	st(pos, node, newstate)
+	-- perform the switch
+	local new_node = {name = new_node_name, param2 = node.param2}
+	advtrains.ndb.swap_node(pos, new_node)
+	-- if callback is present, call it
+	if ndef.advtrains.node_on_switch_state then
+		ndef.advtrains.node_on_switch_state(pos, new_node, old_state, newstate)
+	end
+	-- invalidate paths (only relevant if this is a track)
+	advtrains.invalidate_all_paths(pos)
+
 	return true
 end
 
@@ -86,12 +87,7 @@ function advtrains.is_passive(parpos, pnode)
 	end
 	local node=pnode or advtrains.ndb.get_node(pos)
 	local ndef=minetest.registered_nodes[node.name]
-	if ndef and ndef.advtrains and ndef.advtrains.getstate then
-		return true
-	elseif ndef and ndef.luaautomation and ndef.luaautomation.getstate then
-		if not deprecation_warned[node.name] then
-			minetest.log("warning", node.name.." uses deprecated definition of ATLATC functions in the 'luaautomation' field. Please move them to the 'advtrains' field!")
-		end
+	if ndef and ndef.advtrains and ndef.advtrains.node_state_map then
 		return true
 	else
 		return false
@@ -102,20 +98,10 @@ end
 function advtrains.set_fallback_state(pos, pnode)
 	local node=pnode or advtrains.ndb.get_node(pos)
 	local ndef=minetest.registered_nodes[node.name]
-	local st
-	if ndef and ndef.advtrains and ndef.advtrains.setstate
-			and ndef.advtrains.fallback_state then
-		if advtrains.get_train_at_pos(pos) then
-			return false
-		end
-		
-		if advtrains.interlocking and advtrains.interlocking.route.has_route_lock(minetest.pos_to_string(pos)) then
-			return false
-		end
-		
-		ndef.advtrains.setstate(pos, node, ndef.advtrains.fallback_state)
-		return true
-	end
 	
+	if not ndef or not ndef.advtrains or not ndef.advtrains.node_fallback_state then
+		return false, "no_fallback_state"
+	end
 	
+	return advtrains.setstate(pos, ndef.advtrains.node_fallback_state, node)
 end
diff --git a/advtrains/path.lua b/advtrains/path.lua
index f2b8a13..57829ad 100644
--- a/advtrains/path.lua
+++ b/advtrains/path.lua
@@ -33,17 +33,16 @@
 -- If you need to proceed along the path by a specific actual distance, it does NOT work to simply add it to the index. You should use the path_get_index_by_offset() function.
 
 -- creates the path data structure, reconstructing the train from a position and a connid
--- Important! train.drives_on must exist while calling this method
 -- returns: true - successful
 --           nil - node not yet available/unloaded, please wait
 --         false - node definitely gone, remove train
 function advtrains.path_create(train, pos, connid, rel_index)
 	local posr = advtrains.round_vector_floor_y(pos)
-	local node_ok, conns, rhe = advtrains.get_rail_info_at(pos, train.drives_on)
+	local node_ok, conns, rhe, connmap = advtrains.get_rail_info_at(pos)
 	if not node_ok then
 		return node_ok
 	end
-	local mconnid = advtrains.get_matching_conn(connid, #conns)
+	local mconnid = advtrains.get_matching_conn(connid, connmap)
 	train.index = rel_index
 	train.path = { [0] = { x=posr.x, y=posr.y+rhe, z=posr.z } }
 	train.path_cn = { [0] = connid }
@@ -113,14 +112,21 @@ end
 -- before returning from the calling function.
 function advtrains.path_invalidate(train, ignore_lock)
 	if advtrains.lock_path_inval and not ignore_lock then
-		atwarn("Train ",train.train_id,": Illegal path invalidation has occured during train step:")
+		atwarn("Train ",train.id,": Illegal path invalidation has occured during train step:")
 		atwarn(debug.traceback())
 	end
-
 	if train.path then
+		--atdebug("path_invalidate for",train.id)
+		local _cnt = 0
 		for i,p in pairs(train.path) do
-			advtrains.occ.clear_item(train.id, advtrains.round_vector_floor_y(p))
+			_cnt = _cnt + 1
+			if _cnt > 10000 then
+				atdebug(train)
+				error("Loop trap in advtrains.path_invalidate was triggered!")
+			end
+			advtrains.occ.clear_all_items(train.id, advtrains.round_vector_floor_y(p))
 		end
+		--atdebug("occ cleared")
 	end
 	train.path = nil
 	train.path_dist = nil
@@ -162,7 +168,7 @@ function advtrains.path_invalidate_ahead(train, start_idx, ignore_when_passed)
 	-- leave current node in path, it won't change. What might change is the path onward from here (e.g. switch)
 	local i = idx + 1
 	while train.path[i] do
-		advtrains.occ.clear_item(train.id, advtrains.round_vector_floor_y(train.path[i]))
+		advtrains.occ.clear_specific_item(train.id, advtrains.round_vector_floor_y(train.path[i]), i)
 		i = i+1
 	end
 	train.path_ext_f=idx
@@ -207,23 +213,19 @@ function advtrains.path_get(train, index)
 	while index > pef do
 		local pos = train.path[pef]
 		local connid = train.path_cn[pef]
-		local node_ok, this_conns, adj_pos, adj_connid, conn_idx, nextrail_y, next_conns
+		local node_ok, this_conns, adj_pos, adj_connid, conn_idx, nextrail_y, next_conns, next_connmap
 		if pef == train.path_trk_f then
 			node_ok, this_conns = advtrains.get_rail_info_at(pos)
 			if not node_ok then error("For train "..train.id..": Path item "..pef.." on-track but not a valid node!") end
-			adj_pos, adj_connid, conn_idx, nextrail_y, next_conns = advtrains.get_adjacent_rail(pos, this_conns, connid, train.drives_on)
+			adj_pos, adj_connid, conn_idx, nextrail_y, next_conns, next_connmap = advtrains.get_adjacent_rail(pos, this_conns, connid)
 		end
 		pef = pef + 1
 		if adj_pos then
 			advtrains.occ.set_item(train.id, adj_pos, pef)
-		
-			-- If we have split points, notify accordingly
-			local mconnid = advtrains.get_matching_conn(adj_connid, #next_conns)
-			if #next_conns==3 and adj_connid==1 and train.points_split and train.points_split[advtrains.encode_pos(adj_pos)] then
-				--atdebug(id,"has split points restored at",adj_pos)
-				mconnid = 3
-			end
-		
+			
+			local mconnid = advtrains.get_matching_conn(adj_connid, next_connmap)
+			-- NO split points handling here. It is only required for backwards path calculation
+			
 			adj_pos.y = adj_pos.y + nextrail_y
 			train.path_cp[pef] = adj_connid
 			train.path_cn[pef] = mconnid
@@ -246,23 +248,26 @@ function advtrains.path_get(train, index)
 	while index < peb do
 		local pos = train.path[peb]
 		local connid = train.path_cp[peb]
-		local node_ok, this_conns, adj_pos, adj_connid, conn_idx, nextrail_y, next_conns
+		local node_ok, this_conns, adj_pos, adj_connid, conn_idx, nextrail_y, next_conns, next_connmap
 		if peb == train.path_trk_b then
 			node_ok, this_conns = advtrains.get_rail_info_at(pos)
 			if not node_ok then error("For train "..train.id..": Path item "..peb.." on-track but not a valid node!") end
-			adj_pos, adj_connid, conn_idx, nextrail_y, next_conns = advtrains.get_adjacent_rail(pos, this_conns, connid, train.drives_on)
+			adj_pos, adj_connid, conn_idx, nextrail_y, next_conns, next_connmap = advtrains.get_adjacent_rail(pos, this_conns, connid)
 		end
 		peb = peb - 1
 		if adj_pos then
 			advtrains.occ.set_item(train.id, adj_pos, peb)
 			
-			-- If we have split points, notify accordingly
-			local mconnid = advtrains.get_matching_conn(adj_connid, #next_conns)
-			if #next_conns==3 and adj_connid==1 and train.points_split and train.points_split[advtrains.encode_pos(adj_pos)] then
-				-- atdebug(id,"has split points restored at",adj_pos)
-				mconnid = 3
+			local mconnid = advtrains.get_matching_conn(adj_connid, next_connmap)
+			-- If, for this position, we have remembered the origin conn, apply it here
+			if next_connmap then -- only needs to be done when this track is a turnout (>2 conns)
+				local origin_conn = train.path_ori_cp[advtrains.encode_pos(adj_pos)]
+				if origin_conn then
+					--atdebug("Train",train.id,"at",adj_pos,"restoring turnout origin CP",origin_conn,"for path item",index)
+					mconnid = origin_conn
+				end
 			end
-			
+						
 			adj_pos.y = adj_pos.y + nextrail_y
 			train.path_cn[peb] = adj_connid
 			train.path_cp[peb] = mconnid
@@ -375,12 +380,25 @@ function advtrains.path_get_index_by_offset(train, index, offset)
 	return c_idx + frac
 end
 
+
+-- The path_dist[] table contains absolute distance values for every whole index.
+-- Use this function to retrieve the correct absolute distance for a fractional index value (interpolate between floor and ceil index)
+-- returns: absolute distance from path item 0
+function advtrains.path_get_path_dist_fractional(train, index)
+	local start_index_f = atfloor(index)
+	local frac = index - start_index_f
+	-- ensure path exists
+	advtrains.path_get_adjacent(train, index)
+	local dist1, dist2 = train.path_dist[start_index_f], train.path_dist[start_index_f+1]
+	return dist1 + (dist2-dist1)*frac
+end
+
 local PATH_CLEAR_KEEP = 4
 
 function advtrains.path_clear_unused(train)
 	local i
 	for i = train.path_ext_b, train.path_req_b - PATH_CLEAR_KEEP do
-		advtrains.occ.clear_item(train.id, advtrains.round_vector_floor_y(train.path[i]))
+		advtrains.occ.clear_specific_item(train.id, advtrains.round_vector_floor_y(train.path[i]), i)
 		train.path[i] = nil
 		train.path_dist[i-1] = nil
 		train.path_cp[i] = nil
@@ -421,18 +439,19 @@ end
 -- Projects the path of "train" onto the path of "onto_train_id", and returns the index on onto_train's path
 -- that corresponds to "index" on "train"'s path, as well as whether both trains face each other
 -- index may be fractional
+-- heuristic: see advtrains.occ.reverse_lookup_sel()
 -- returns: res_index, trains_facing
 -- returns nil when path can not be projected, either because trains are on different tracks or
 -- node at "index" happens to be on a turnout and it's the wrong direction
 -- Note - duplicate with similar functionality is in train_step_b() - that code combines train detection with projecting
-function advtrains.path_project(train, index, onto_train_id)
+function advtrains.path_project(train, index, onto_train_id, heuristic)
 	local base_idx = atfloor(index)
 	local frac_part = index - base_idx
 	local base_pos = advtrains.path_get(train, base_idx)
 	local base_cn =  train.path_cn[base_idx]
 	local otrn = advtrains.trains[onto_train_id]
 	-- query occupation
-	local occ = advtrains.occ.get_trains_over(base_pos)
+	local occ = advtrains.occ.reverse_lookup_sel(base_pos, heuristic)
 	-- is wanted train id contained?
 	local ob_idx = occ[onto_train_id]
 	if not ob_idx then
diff --git a/advtrains/po/README.md b/advtrains/po/README.md
new file mode 100644
index 0000000..3e94682
--- /dev/null
+++ b/advtrains/po/README.md
@@ -0,0 +1,70 @@
+# Translations
+Please read this document before working on any translations.
+
+Unlike many other mods, Advtrains uses `.po` files for localization,
+which are then automatically converted to `.tr` files when the mod is
+loaded. Therefore, please submit patches that edit the `.po` files.
+
+## Getting Started
+The translation files can be edited like any other `.po` file.
+
+If the translation file for your language does not exist, create it by
+copying `template.txt` to `advtrains.XX.tr`, where `XX` is replaced by
+the language code.
+
+Feel free to use the [discussion mailing list][srht-discuss] if you
+have any questions regarding localization.
+
+You can share your `.po` file directly or [as a patch][gsm] to the [dev
+mailing list][srht-devel]. The latter is encouraged, but, unlike code
+changes, translation files sent directly are also accepted.
+
+[tr-format]: https://minetest.gitlab.io/minetest/translations/#translation-file-format
+[srht-discuss]: https://lists.sr.ht/~gpcf/advtrains-discuss
+[srht-devel]: https://lists.sr.ht/~gpcf/advtrains-devel
+[gsm]: https://git-send-email.io
+
+## Translation Notes
+* Translations should be consistent. You can use other entries or the
+translations in Minetest as a reference.
+* Translations do not have to fully correspond to the original text -
+they only need to provide the same information. In particular,
+translations do not need to have the same linguistical structure as the
+original text.
+* Replacement sequences (`@1`, `@2`, etc) should not be translated.
+* Certain abbreviations or names, such as "Ks" or "Zs 3", should
+generally not be translated.
+
+### (de) German
+* Verwenden Sie die neue Rechtschreibung und die Sie-Form.
+* Mit der deutschen Tastaturbelegung unter Linux können die
+Anführungszeichen „“ mit AltGr-V bzw. AltGr-B eingegeben werden.
+
+### (zh) Chinese
+(This section is written in English to avoid writing the note twice or
+using only one of the variants, as most of this section applies to both
+the traditional and simplified variants.)
+
+* Please use the 「」 quotation marks for Traditional Chinese and “”
+for Simplified Chinese.
+* Please use the fullwidth variants of: ， 、 。 ？ ！ ： ；
+* Please use the halfwidth variants of: ( ) [ ] / \ |
+* Please do not leave any space between Han characters (including
+fullwidth punctuation marks).
+* Please leave a space between Han characters (excluding fullwidth
+punctuation marks) and characters from other scripts (including
+halfwidth punctuation marks). However, do not leave any space between
+Han characters and Arabic numerals.
+
+## Notes for developers
+* The `update-translations.sh` script can be used to update the
+translation files. However, please make sure to install the
+`basic_trains` mod before running the script.
+* Please make sure that the first argument to `S` (or `attrans`) _only_
+includes string literals without formatting or concatenation. This is
+unfortunately a limitation of the `xgettext` utility.
+* Avoid word-by-word translations.
+* Avoid manipulating translated strings (except for concatenation). Use
+server-side translations if you have to modify the text sent to users.
+* Avoid truncating strings unless multibyte characters are handled
+properly.
diff --git a/advtrains/po/advtrains.pot b/advtrains/po/advtrains.pot
new file mode 100644
index 0000000..6fda1d7
--- /dev/null
+++ b/advtrains/po/advtrains.pot
@@ -0,0 +1,632 @@
+# SOME DESCRIPTIVE TITLE.
+# Copyright (C) YEAR THE PACKAGE'S COPYRIGHT HOLDER
+# This file is distributed under the same license as the advtrains package.
+# FIRST AUTHOR <EMAIL@ADDRESS>, YEAR.
+#
+#, fuzzy
+msgid ""
+msgstr ""
+"Project-Id-Version: advtrains\n"
+"Report-Msgid-Bugs-To: advtrains-discuss@lists.sr.ht\n"
+"POT-Creation-Date: 2023-10-09 11:02+0200\n"
+"PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
+"Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
+"Language-Team: LANGUAGE <LL@li.org>\n"
+"Language: \n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=CHARSET\n"
+"Content-Transfer-Encoding: 8bit\n"
+
+#: advtrains/atc.lua:109
+msgid "Unconfigured ATC controller"
+msgstr ""
+
+#: advtrains/atc.lua:150
+msgid ""
+"ATC controller, mode @1\n"
+"Command: @2"
+msgstr ""
+
+#: advtrains/atc.lua:180
+msgid "Command"
+msgstr ""
+
+#: advtrains/atc.lua:184
+msgid "Command (on)"
+msgstr ""
+
+#: advtrains/atc.lua:187
+msgid "Digiline channel"
+msgstr ""
+
+#: advtrains/atc.lua:189 advtrains_line_automation/stoprail.lua:65
+#: advtrains_luaautomation/active_common.lua:48
+msgid "Save"
+msgstr ""
+
+#: advtrains/atc.lua:236
+msgid "ATC Reverse command warning: didn't reverse train, train moving."
+msgstr ""
+
+#: advtrains/atc.lua:248
+msgid "ATC Kick command warning: doors are closed."
+msgstr ""
+
+#: advtrains/atc.lua:252
+msgid "ATC Kick command warning: train moving."
+msgstr ""
+
+#: advtrains/atc.lua:322
+msgid "ATC command syntax error: I statement not closed: @1"
+msgstr ""
+
+#: advtrains/atc.lua:385
+msgid "ATC command parse error: Unknown command: @1"
+msgstr ""
+
+#: advtrains/copytool.lua:8
+msgid ""
+"Train copy/paste tool\n"
+"\n"
+"Left-click: copy train\n"
+"Right-click: paste train"
+msgstr ""
+
+#: advtrains/copytool.lua:29
+msgid "You do not have the @1 privilege."
+msgstr ""
+
+#: advtrains/copytool.lua:41
+msgid "The track you are trying to place the wagon on is not long enough."
+msgstr ""
+
+#: advtrains/copytool.lua:47
+msgid "The clipboard couldn't access the metadata. Paste failed."
+msgstr ""
+
+#: advtrains/copytool.lua:52 advtrains/copytool.lua:57
+msgid "The clipboard is empty."
+msgstr ""
+
+#: advtrains/copytool.lua:74
+msgid "Back of train would end up off track, cancelling."
+msgstr ""
+
+#: advtrains/copytool.lua:92
+msgid "No such lua entity."
+msgstr ""
+
+#: advtrains/copytool.lua:98
+msgid "No such wagon: @1."
+msgstr ""
+
+#: advtrains/copytool.lua:104
+msgid "No such train: @1."
+msgstr ""
+
+#: advtrains/copytool.lua:176
+msgid "The clipboard couldn't access the metadata. Copy failed."
+msgstr ""
+
+#: advtrains/copytool.lua:180
+msgid "Train copied."
+msgstr ""
+
+#: advtrains/couple.lua:28
+msgid "Buffer and Chain Coupler"
+msgstr ""
+
+#: advtrains/couple.lua:29
+msgid "Scharfenberg Coupler"
+msgstr ""
+
+#: advtrains/couple.lua:185
+msgid ""
+"You are not allowed to couple trains without the train_operator privilege."
+msgstr ""
+
+#: advtrains/couple.lua:329 advtrains/couple.lua:333
+msgid "<No coupler>"
+msgstr ""
+
+#: advtrains/couple.lua:334
+msgid "Can not couple: The couplers of the trains do not match (@1 and @2)."
+msgstr ""
+
+#: advtrains/craft_items.lua:3
+msgid "Boiler"
+msgstr ""
+
+#: advtrains/craft_items.lua:9
+msgid "Driver's cab"
+msgstr ""
+
+#: advtrains/craft_items.lua:15
+msgid "Wheel"
+msgstr ""
+
+#: advtrains/craft_items.lua:21
+msgid "Chimney"
+msgstr ""
+
+#: advtrains/misc_nodes.lua:16
+msgid "@1 Platform (low)"
+msgstr ""
+
+#: advtrains/misc_nodes.lua:33
+msgid "@1 Platform (high)"
+msgstr ""
+
+#: advtrains/misc_nodes.lua:59
+msgid "@1 Platform (45 degree)"
+msgstr ""
+
+#: advtrains/misc_nodes.lua:81
+msgid "@1 Platform (low, 45 degree)"
+msgstr ""
+
+#: advtrains/protection.lua:7
+msgid "Can place, remove and operate trains"
+msgstr ""
+
+#: advtrains/protection.lua:12
+msgid ""
+"Can place, remove and operate any train, regardless of owner, whitelist, or "
+"protection"
+msgstr ""
+
+#: advtrains/protection.lua:18
+msgid "Can place and dig tracks in unprotected areas"
+msgstr ""
+
+#: advtrains/protection.lua:24
+msgid "Can operate turnouts and signals in unprotected areas"
+msgstr ""
+
+#: advtrains/protection.lua:148
+msgid ""
+"You are not allowed to build near tracks without the track_builder privilege."
+msgstr ""
+
+#: advtrains/protection.lua:148
+msgid ""
+"You are not allowed to build tracks without the track_builder privilege."
+msgstr ""
+
+#: advtrains/protection.lua:153
+msgid "You are not allowed to build near tracks at this protected position."
+msgstr ""
+
+#: advtrains/protection.lua:153
+msgid "You are not allowed to build tracks at this protected position."
+msgstr ""
+
+#: advtrains/protection.lua:184
+msgid ""
+"You are not allowed to operate turnouts and signals without the "
+"railway_operator privilege."
+msgstr ""
+
+#: advtrains/signals.lua:63
+msgid "Lampless Signal"
+msgstr ""
+
+#: advtrains/signals.lua:127
+msgid "Signal"
+msgstr ""
+
+#: advtrains/signals.lua:191
+msgid "Wallmounted Signal (left)"
+msgstr ""
+
+#: advtrains/signals.lua:192
+msgid "Wallmounted Signal (right)"
+msgstr ""
+
+#: advtrains/signals.lua:193
+msgid "Wallmounted Signal (top)"
+msgstr ""
+
+#: advtrains/signals.lua:281 advtrains/signals.lua:322
+msgid "Andrew's Cross"
+msgstr ""
+
+#: advtrains/trackplacer.lua:313
+msgid ""
+"Track Worker Tool\n"
+"\n"
+"Left-click: change rail type (straight/curve/switch)\n"
+"Right-click: rotate object"
+msgstr ""
+
+#: advtrains/trackplacer.lua:340 advtrains/trackplacer.lua:377
+msgid "This node can't be rotated using the trackworker."
+msgstr ""
+
+#: advtrains/trackplacer.lua:350
+msgid "This track can not be rotated."
+msgstr ""
+
+#: advtrains/trackplacer.lua:404
+msgid "This node can't be changed using the trackworker."
+msgstr ""
+
+#: advtrains/trackplacer.lua:414
+msgid "This track can not be changed."
+msgstr ""
+
+#: advtrains/tracks.lua:449
+msgid "This track can not be removed."
+msgstr ""
+
+#: advtrains/tracks.lua:616
+msgid "Position is occupied by a train."
+msgstr ""
+
+#: advtrains/tracks.lua:622
+msgid "There's a Track Circuit Break here."
+msgstr ""
+
+#: advtrains/tracks.lua:626
+msgid "There's a Signal Influence Point here."
+msgstr ""
+
+#: advtrains/tracks.lua:637
+msgid "@1 Slope"
+msgstr ""
+
+#: advtrains/tracks.lua:648 advtrains/tracks.lua:653
+msgid "Can't place slope: not pointing at node."
+msgstr ""
+
+#: advtrains/tracks.lua:658
+msgid "Can't place slope: space occupied."
+msgstr ""
+
+#: advtrains/tracks.lua:711
+msgid "Can't place slope: Not enough slope items left (@1 required)."
+msgstr ""
+
+#: advtrains/tracks.lua:714
+msgid "Can't place slope: There's no slope of length @1."
+msgstr ""
+
+#: advtrains/tracks.lua:721
+msgid "Can't place slope: no supporting node at upper end."
+msgstr ""
+
+#: advtrains/trainhud.lua:305
+msgid "OVERRUN RED SIGNAL! Examine situation and reverse train to move again."
+msgstr ""
+
+#: advtrains/wagons.lua:179
+msgid "This wagon is owned by @1, you can't destroy it."
+msgstr ""
+
+#: advtrains/wagons.lua:203
+msgid "The wagon's inventory is not empty."
+msgstr ""
+
+#: advtrains/wagons.lua:210
+msgid "Wagon needs to be decoupled from other wagons in order to destroy it."
+msgstr ""
+
+#: advtrains/wagons.lua:216
+msgid ""
+"Warning: If you destroy this wagon, you only get some steel back! If you are "
+"sure, hold Sneak and left-click the wagon."
+msgstr ""
+
+#: advtrains/wagons.lua:649 advtrains/wagons.lua:850
+msgid "Show Inventory"
+msgstr ""
+
+#: advtrains/wagons.lua:652
+msgid "Onboard Computer"
+msgstr ""
+
+#: advtrains/wagons.lua:655 advtrains/wagons.lua:1328
+msgid "Wagon properties"
+msgstr ""
+
+#: advtrains/wagons.lua:658
+msgid "Get off"
+msgstr ""
+
+#: advtrains/wagons.lua:661
+msgid "Get off (forced)"
+msgstr ""
+
+#: advtrains/wagons.lua:663
+msgid "(Doors closed)"
+msgstr ""
+
+#: advtrains/wagons.lua:692
+msgid "This wagon has no seats."
+msgstr ""
+
+#: advtrains/wagons.lua:703
+msgid "This wagon is full."
+msgstr ""
+
+#: advtrains/wagons.lua:706
+msgid "Doors are closed! (Try holding sneak key!)"
+msgstr ""
+
+#: advtrains/wagons.lua:712
+msgid "You can't get on this wagon."
+msgstr ""
+
+#: advtrains/wagons.lua:838
+msgid "Select seat:"
+msgstr ""
+
+#: advtrains/wagons.lua:880
+msgid "Save wagon properties"
+msgstr ""
+
+#: advtrains/wagons.lua:965
+msgid "Text displayed outside on train"
+msgstr ""
+
+#: advtrains/wagons.lua:966
+msgid "Text displayed inside train"
+msgstr ""
+
+#: advtrains/wagons.lua:967
+msgid "Line"
+msgstr ""
+
+#: advtrains/wagons.lua:968
+msgid "Routingcode"
+msgstr ""
+
+#: advtrains/wagons.lua:1241
+msgid ""
+"Doors are closed. Use Sneak+rightclick to ignore the closed doors and get "
+"off."
+msgstr ""
+
+#: advtrains/wagons.lua:1250
+msgid "You are not allowed to access the driver stand."
+msgstr ""
+
+#: advtrains_interlocking/tsr_rail.lua:13
+msgid "Point speed restriction: @1"
+msgstr ""
+
+#: advtrains_interlocking/tsr_rail.lua:14
+msgid "Set point speed restriction:"
+msgstr ""
+
+#: advtrains_interlocking/tsr_rail.lua:30
+msgid "You are not allowed to configure this track without the @1 privilege."
+msgstr ""
+
+#: advtrains_interlocking/tsr_rail.lua:34
+#: advtrains_line_automation/stoprail.lua:31
+#: advtrains_line_automation/stoprail.lua:76
+msgid "You are not allowed to configure this track."
+msgstr ""
+
+#: advtrains_interlocking/tsr_rail.lua:64
+msgid "Point Speed Restriction Track"
+msgstr ""
+
+#: advtrains_line_automation/stoprail.lua:54
+msgid "Station Code"
+msgstr ""
+
+#: advtrains_line_automation/stoprail.lua:55
+msgid "Station Name"
+msgstr ""
+
+#: advtrains_line_automation/stoprail.lua:56
+msgid "Door Delay"
+msgstr ""
+
+#: advtrains_line_automation/stoprail.lua:57
+msgid "Dep. Speed"
+msgstr ""
+
+#: advtrains_line_automation/stoprail.lua:58 advtrains_train_track/init.lua:11
+#: advtrains_train_track/init.lua:156
+msgid "Track"
+msgstr ""
+
+#: advtrains_line_automation/stoprail.lua:59
+msgid "Stop Time"
+msgstr ""
+
+#: advtrains_line_automation/stoprail.lua:60
+msgid "Door Side"
+msgstr ""
+
+#: advtrains_line_automation/stoprail.lua:62
+msgid "Reverse train"
+msgstr ""
+
+#: advtrains_line_automation/stoprail.lua:63
+msgid "Kick out passengers"
+msgstr ""
+
+#: advtrains_line_automation/stoprail.lua:97
+msgid "Station code \"@1\" already exists and is owned by @2."
+msgstr ""
+
+#: advtrains_line_automation/stoprail.lua:111
+msgid "This station is owned by @1. You are not allowed to edit its name."
+msgstr ""
+
+#: advtrains_line_automation/stoprail.lua:221
+msgid "Station/Stop Track"
+msgstr ""
+
+#: advtrains_luaautomation/active_common.lua:17
+msgid "Unconfigured LuaATC component"
+msgstr ""
+
+#: advtrains_luaautomation/active_common.lua:46
+msgid "LuaATC Environment"
+msgstr ""
+
+#: advtrains_luaautomation/active_common.lua:49
+msgid "Clear Local Environment"
+msgstr ""
+
+#: advtrains_luaautomation/active_common.lua:50
+msgid "Code"
+msgstr ""
+
+#: advtrains_luaautomation/active_common.lua:64
+msgid ""
+"You are not allowed to configure this LuaATC component without the @1 "
+"privilege."
+msgstr ""
+
+#: advtrains_luaautomation/active_common.lua:94
+msgid "LuaATC component assigned to environment '@1'"
+msgstr ""
+
+#: advtrains_luaautomation/active_common.lua:96
+msgid "LuaATC component assigned to an invalid environment"
+msgstr ""
+
+#: advtrains_luaautomation/active_common.lua:171
+msgid "LuaATC component with error: @1"
+msgstr ""
+
+#: advtrains_luaautomation/init.lua:13
+msgid ""
+"Can place and configure LuaATC components, including execute potentially "
+"harmful Lua code"
+msgstr ""
+
+#: advtrains_luaautomation/mesecon_controller.lua:211
+msgid "LuaATC Mesecon Controller"
+msgstr ""
+
+#: advtrains_luaautomation/operation_panel.lua:11
+msgid "LuaATC Operation Panel"
+msgstr ""
+
+#: advtrains_luaautomation/pcnaming.lua:28
+msgid ""
+"Passive Component Naming Tool\n"
+"\n"
+"Right-click to name a passive component."
+msgstr ""
+
+#: advtrains_luaautomation/pcnaming.lua:39
+msgid ""
+"You are not allowed to name LuaATC passive components without the @1 "
+"privilege."
+msgstr ""
+
+#: advtrains_luaautomation/pcnaming.lua:62
+msgid "Set name of component (empty to clear)"
+msgstr ""
+
+#: advtrains_train_industrial/init.lua:10
+#: advtrains_train_industrial/init.lua:49 advtrains_train_steam/init.lua:20
+#: advtrains_train_steam/init.lua:91
+msgid "Driver Stand (right)"
+msgstr ""
+
+#: advtrains_train_industrial/init.lua:17
+#: advtrains_train_industrial/init.lua:56 advtrains_train_steam/init.lua:14
+#: advtrains_train_steam/init.lua:85
+msgid "Driver Stand (left)"
+msgstr ""
+
+#: advtrains_train_industrial/init.lua:40
+msgid "Industrial Train Engine"
+msgstr ""
+
+#: advtrains_train_industrial/init.lua:79
+msgid "Big Industrial Train Engine"
+msgstr ""
+
+#: advtrains_train_industrial/init.lua:98
+msgid "Industrial tank wagon"
+msgstr ""
+
+#: advtrains_train_industrial/init.lua:116
+msgid "Industrial wood wagon"
+msgstr ""
+
+#: advtrains_train_japan/init.lua:4
+msgid "Japanese Train Inter-Wagon Connection"
+msgstr ""
+
+#: advtrains_train_japan/init.lua:37
+msgid "Driver stand"
+msgstr ""
+
+#: advtrains_train_japan/init.lua:101
+msgid "Japanese Train Engine"
+msgstr ""
+
+#: advtrains_train_japan/init.lua:176
+msgid "Japanese Train Wagon"
+msgstr ""
+
+#: advtrains_train_steam/init.lua:75
+msgid "Steam Engine"
+msgstr ""
+
+#: advtrains_train_steam/init.lua:159
+msgid "Detailed Steam Engine"
+msgstr ""
+
+#: advtrains_train_steam/init.lua:206
+msgid "Passenger Wagon"
+msgstr ""
+
+#: advtrains_train_steam/init.lua:226
+msgid "Box Wagon"
+msgstr ""
+
+#: advtrains_train_subway/init.lua:144
+msgid "Subway Passenger Wagon"
+msgstr ""
+
+#: advtrains_train_track/init.lua:31
+msgid "Y-turnout"
+msgstr ""
+
+#: advtrains_train_track/init.lua:49
+msgid "3-way turnout"
+msgstr ""
+
+#: advtrains_train_track/init.lua:69
+msgid "Perpendicular Diamond Crossing Track"
+msgstr ""
+
+#: advtrains_train_track/init.lua:91
+msgid "90+Angle Diamond Crossing Track"
+msgstr ""
+
+#: advtrains_train_track/init.lua:132
+msgid "Diagonal Diamond Crossing Track"
+msgstr ""
+
+#: advtrains_train_track/init.lua:179
+msgid "Bumper"
+msgstr ""
+
+#: advtrains_train_track/init.lua:201
+msgid "ATC controller"
+msgstr ""
+
+#: advtrains_train_track/init.lua:317
+msgid "Unloading Track"
+msgstr ""
+
+#: advtrains_train_track/init.lua:342
+msgid "Loading Track"
+msgstr ""
+
+#: advtrains_train_track/init.lua:406
+msgid "Detector Rail"
+msgstr ""
diff --git a/advtrains/po/de.po b/advtrains/po/de.po
new file mode 100644
index 0000000..8821fe3
--- /dev/null
+++ b/advtrains/po/de.po
@@ -0,0 +1,724 @@
+msgid ""
+msgstr ""
+"Project-Id-Version: advtrains\n"
+"Report-Msgid-Bugs-To: advtrains-discuss@lists.sr.ht\n"
+"POT-Creation-Date: 2023-10-09 11:02+0200\n"
+"PO-Revision-Date: 2023-10-09 11:18+0200\n"
+"Last-Translator: Y. Wang <yw05@forksworld.de>\n"
+"Language-Team: German\n"
+"Language: de\n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+"X-Generator: Poedit 3.3.2\n"
+
+#: advtrains/atc.lua:109
+msgid "Unconfigured ATC controller"
+msgstr "Nicht konfiguiertes Zugbeeinflussungsgleis"
+
+#: advtrains/atc.lua:150
+msgid ""
+"ATC controller, mode @1\n"
+"Command: @2"
+msgstr ""
+"Zugbeeinflussungsgleis in Betriebsart „@1“\n"
+"Befehl: @2"
+
+#: advtrains/atc.lua:180
+msgid "Command"
+msgstr "Befehl"
+
+#: advtrains/atc.lua:184
+msgid "Command (on)"
+msgstr "Befehl (wenn aktiviert)"
+
+#: advtrains/atc.lua:187
+msgid "Digiline channel"
+msgstr "Digiline-Kanal"
+
+#: advtrains/atc.lua:189 advtrains_line_automation/stoprail.lua:65
+#: advtrains_luaautomation/active_common.lua:48
+msgid "Save"
+msgstr "Speichern"
+
+#: advtrains/atc.lua:236
+msgid "ATC Reverse command warning: didn't reverse train, train moving."
+msgstr ""
+"Zugbeeinflussung: Der Zug befindet sich in Bewegung und kann nicht umgekehrt "
+"werden."
+
+#: advtrains/atc.lua:248
+msgid "ATC Kick command warning: doors are closed."
+msgstr ""
+"Zugbeeinflussung: Wegen geschlossener Türen werden Fahrgäste nicht zum "
+"Ausstieg gezwungen."
+
+#: advtrains/atc.lua:252
+msgid "ATC Kick command warning: train moving."
+msgstr ""
+"Zugbeeinflussung: Der Zug befindet sich in Bewegung, Fahrgäste werden nicht "
+"zum Ausstieg gezwungen."
+
+#: advtrains/atc.lua:322
+msgid "ATC command syntax error: I statement not closed: @1"
+msgstr "Zugbeeinflussung: Unvollständiger I-Befehl: @1"
+
+#: advtrains/atc.lua:385
+msgid "ATC command parse error: Unknown command: @1"
+msgstr "Zugbeeinflussung: Unbekannter Befehl: @1"
+
+#: advtrains/copytool.lua:8
+msgid ""
+"Train copy/paste tool\n"
+"\n"
+"Left-click: copy train\n"
+"Right-click: paste train"
+msgstr ""
+"Werkzeug zur Erstellung von Zugkopien\n"
+"\n"
+"Linksklick: Zug ins Clipboard kopieren\n"
+"Right-click: Kopierten Zug einfügen"
+
+#: advtrains/copytool.lua:29
+msgid "You do not have the @1 privilege."
+msgstr "Ihnen fehlt das „@1“-Privileg."
+
+#: advtrains/copytool.lua:41
+msgid "The track you are trying to place the wagon on is not long enough."
+msgstr "Das Gleis, auf dem der Waggon platziert werden woll, ist zu kurz."
+
+#: advtrains/copytool.lua:47
+msgid "The clipboard couldn't access the metadata. Paste failed."
+msgstr ""
+"Wegen des fehlgeschlagenen Zugriffs auf die Metadaten konnte eine Kopie des "
+"Zuges nicht eingefügt werden."
+
+#: advtrains/copytool.lua:52 advtrains/copytool.lua:57
+msgid "The clipboard is empty."
+msgstr "Das Clipboard ist leer."
+
+#: advtrains/copytool.lua:74
+msgid "Back of train would end up off track, cancelling."
+msgstr "Der hinterer Teil dez Zuges wäre nicht auf dem Gleis."
+
+#: advtrains/copytool.lua:92
+msgid "No such lua entity."
+msgstr ""
+"Sie zeigen nicht auf einem Objekt, das mit diesem Werkzeug kopiert werden "
+"kann."
+
+#: advtrains/copytool.lua:98
+msgid "No such wagon: @1."
+msgstr "Es gibt keinen mit „@1“ identifizierbaren Waggon."
+
+#: advtrains/copytool.lua:104
+msgid "No such train: @1."
+msgstr "Es gibt keinen mit „@1“ identifizierbaren Zug."
+
+#: advtrains/copytool.lua:176
+msgid "The clipboard couldn't access the metadata. Copy failed."
+msgstr ""
+"Wegen des fehlgeschlagenen Zugriffs auf die Metadaten konnte der Zug nicht "
+"kopiert werden."
+
+#: advtrains/copytool.lua:180
+msgid "Train copied."
+msgstr "Der Zug wurde Kopiert."
+
+#: advtrains/couple.lua:28
+msgid "Buffer and Chain Coupler"
+msgstr "Schraubenkupplung"
+
+#: advtrains/couple.lua:29
+msgid "Scharfenberg Coupler"
+msgstr "Scharfenbergkupplung"
+
+#: advtrains/couple.lua:185
+msgid ""
+"You are not allowed to couple trains without the train_operator privilege."
+msgstr "Sie dürfen ohne das „train_operator“-Privileg keine Züge ankuppeln."
+
+#: advtrains/couple.lua:329 advtrains/couple.lua:333
+msgid "<No coupler>"
+msgstr "<Keine Kupplung vorhanden>"
+
+#: advtrains/couple.lua:334
+msgid "Can not couple: The couplers of the trains do not match (@1 and @2)."
+msgstr "Die Kupplungen der Züge passen nicht zueinander (@1 und @2)."
+
+#: advtrains/craft_items.lua:3
+msgid "Boiler"
+msgstr ""
+
+#: advtrains/craft_items.lua:9
+msgid "Driver's cab"
+msgstr "Führerstand"
+
+#: advtrains/craft_items.lua:15
+msgid "Wheel"
+msgstr ""
+
+#: advtrains/craft_items.lua:21
+msgid "Chimney"
+msgstr ""
+
+#: advtrains/misc_nodes.lua:16
+msgid "@1 Platform (low)"
+msgstr "Niedriger @1-Bahnsteig"
+
+#: advtrains/misc_nodes.lua:33
+msgid "@1 Platform (high)"
+msgstr "Hoher @1-Bahnsteig"
+
+#: advtrains/misc_nodes.lua:59
+msgid "@1 Platform (45 degree)"
+msgstr "Hoher @1-Bahnsteig (45°)"
+
+#: advtrains/misc_nodes.lua:81
+msgid "@1 Platform (low, 45 degree)"
+msgstr "Niedriger @1-Bahnsteig (45°)"
+
+#: advtrains/protection.lua:7
+msgid "Can place, remove and operate trains"
+msgstr ""
+
+#: advtrains/protection.lua:12
+msgid ""
+"Can place, remove and operate any train, regardless of owner, whitelist, or "
+"protection"
+msgstr ""
+
+#: advtrains/protection.lua:18
+msgid "Can place and dig tracks in unprotected areas"
+msgstr ""
+
+#: advtrains/protection.lua:24
+msgid "Can operate turnouts and signals in unprotected areas"
+msgstr ""
+
+#: advtrains/protection.lua:148
+msgid ""
+"You are not allowed to build near tracks without the track_builder privilege."
+msgstr ""
+"Sie dürfen ohne das „track_builder“-Privileg nicht in der Nähe von Gleisen "
+"bauen."
+
+#: advtrains/protection.lua:148
+msgid ""
+"You are not allowed to build tracks without the track_builder privilege."
+msgstr "Sie dürfen ohne das „track_builder“-Privileg kein Gleis bauen."
+
+#: advtrains/protection.lua:153
+msgid "You are not allowed to build near tracks at this protected position."
+msgstr "Sie dürfen an geschützten Stellen nicht in der Nähe von Gleisen bauen."
+
+#: advtrains/protection.lua:153
+msgid "You are not allowed to build tracks at this protected position."
+msgstr "Sie dürfen an geschützten Stellen kein Gleis bauen."
+
+#: advtrains/protection.lua:184
+msgid ""
+"You are not allowed to operate turnouts and signals without the "
+"railway_operator privilege."
+msgstr ""
+"Sie dürfen ohne das „railway_operator“-Privileg keine Bahnanlage operieren."
+
+#: advtrains/signals.lua:63
+msgid "Lampless Signal"
+msgstr "Mechanisches Signal"
+
+#: advtrains/signals.lua:127
+msgid "Signal"
+msgstr "Lichtsignal"
+
+#: advtrains/signals.lua:191
+msgid "Wallmounted Signal (left)"
+msgstr "An der linken Seite montiertes Signal"
+
+#: advtrains/signals.lua:192
+msgid "Wallmounted Signal (right)"
+msgstr "An der rechten Seite montiertes Signal"
+
+#: advtrains/signals.lua:193
+msgid "Wallmounted Signal (top)"
+msgstr "An der Decke montiertes Signal"
+
+#: advtrains/signals.lua:281 advtrains/signals.lua:322
+msgid "Andrew's Cross"
+msgstr "Andreaskreuz"
+
+#: advtrains/trackplacer.lua:313
+msgid ""
+"Track Worker Tool\n"
+"\n"
+"Left-click: change rail type (straight/curve/switch)\n"
+"Right-click: rotate object"
+msgstr ""
+"Gleiswerkzeug\n"
+"\n"
+"Linksklick: Gleistyp ändern\n"
+"Rechtsklick: Objekt drehen"
+
+#: advtrains/trackplacer.lua:340 advtrains/trackplacer.lua:377
+msgid "This node can't be rotated using the trackworker."
+msgstr "Dieser Block kann nicht mit dem Gleiswerkzeug gedreht werden."
+
+#: advtrains/trackplacer.lua:350
+msgid "This track can not be rotated."
+msgstr "Dieses Gleis kann nicht gedreht werden."
+
+#: advtrains/trackplacer.lua:404
+msgid "This node can't be changed using the trackworker."
+msgstr "Dieser Block kann nicht mit dem Gleiswerkzeug bearbeitet werden."
+
+#: advtrains/trackplacer.lua:414
+msgid "This track can not be changed."
+msgstr "Dieses Gleis kann nicht geändert werden."
+
+#: advtrains/tracks.lua:449
+msgid "This track can not be removed."
+msgstr "Dieses Gleis kann nicht entfernt werden."
+
+#: advtrains/tracks.lua:616
+msgid "Position is occupied by a train."
+msgstr "Ein Zug steht an dieser Position."
+
+#: advtrains/tracks.lua:622
+msgid "There's a Track Circuit Break here."
+msgstr "Hier ist eine Gleisabschnittsgrenze (TCB)."
+
+#: advtrains/tracks.lua:626
+msgid "There's a Signal Influence Point here."
+msgstr "Hier ist ein Signal-Beeinflussungspunkt."
+
+#: advtrains/tracks.lua:637
+msgid "@1 Slope"
+msgstr "@1 Steigung"
+
+#: advtrains/tracks.lua:648 advtrains/tracks.lua:653
+msgid "Can't place slope: not pointing at node."
+msgstr "Es kann nicht platziert werden: Sie zeigen nicht auf einem Block."
+
+#: advtrains/tracks.lua:658
+msgid "Can't place slope: space occupied."
+msgstr "Es kann nicht platziert werden: Diese Position ist besetzt."
+
+#: advtrains/tracks.lua:711
+msgid "Can't place slope: Not enough slope items left (@1 required)."
+msgstr ""
+"Es kann nicht platziert werden: Sie haben nicht genug Steigungsblöcke, es "
+"werden insgesamt @1 benötigt."
+
+#: advtrains/tracks.lua:714
+msgid "Can't place slope: There's no slope of length @1."
+msgstr ""
+"Es kann nicht platziert werden: die Steigung der Länge @1 ist nicht "
+"definiert."
+
+#: advtrains/tracks.lua:721
+msgid "Can't place slope: no supporting node at upper end."
+msgstr ""
+"Es kann nicht platziert werden: es gibt keinen unterstützenden Block am Ende "
+"der Steigung."
+
+#: advtrains/trainhud.lua:305
+msgid "OVERRUN RED SIGNAL! Examine situation and reverse train to move again."
+msgstr ""
+
+#: advtrains/wagons.lua:179
+msgid "This wagon is owned by @1, you can't destroy it."
+msgstr "Dieser Waggon gehört @1, Sie dürfen ihn nicht abbauen."
+
+#: advtrains/wagons.lua:203
+msgid "The wagon's inventory is not empty."
+msgstr "Das Inventar dieses Waggons ist nicht leer."
+
+#: advtrains/wagons.lua:210
+msgid "Wagon needs to be decoupled from other wagons in order to destroy it."
+msgstr "Der Waggon muss abgekoppelt sein, damit Sie ihn abbauen können."
+
+#: advtrains/wagons.lua:216
+msgid ""
+"Warning: If you destroy this wagon, you only get some steel back! If you are "
+"sure, hold Sneak and left-click the wagon."
+msgstr ""
+"Warnung: Durch den Abbau des Waggons erhalten Sie nur etwas Stahl zurück. "
+"Nutzen Sie Schleichen+Linksklick, um dem Waggon abzubauen."
+
+#: advtrains/wagons.lua:649 advtrains/wagons.lua:850
+msgid "Show Inventory"
+msgstr "Inventar Zeigen"
+
+#: advtrains/wagons.lua:652
+msgid "Onboard Computer"
+msgstr ""
+
+#: advtrains/wagons.lua:655 advtrains/wagons.lua:1328
+msgid "Wagon properties"
+msgstr "Waggon-Einstellungen"
+
+#: advtrains/wagons.lua:658
+msgid "Get off"
+msgstr "Aussteigen"
+
+#: advtrains/wagons.lua:661
+msgid "Get off (forced)"
+msgstr "Ausstieg zwingen"
+
+#: advtrains/wagons.lua:663
+msgid "(Doors closed)"
+msgstr "(Türen geschlossen)"
+
+#: advtrains/wagons.lua:692
+msgid "This wagon has no seats."
+msgstr "In diesem Waggon ist kein Sitzplatz vorhanden."
+
+#: advtrains/wagons.lua:703
+msgid "This wagon is full."
+msgstr "Der Waggon ist voll."
+
+#: advtrains/wagons.lua:706
+msgid "Doors are closed! (Try holding sneak key!)"
+msgstr "Die Türen sind geschlossen."
+
+#: advtrains/wagons.lua:712
+msgid "You can't get on this wagon."
+msgstr "Sie können nicht in diesen Waggon einsteigen."
+
+#: advtrains/wagons.lua:838
+msgid "Select seat:"
+msgstr "Wählen Sie einen Sitzplatz aus:"
+
+#: advtrains/wagons.lua:880
+msgid "Save wagon properties"
+msgstr "Waggon-Einstellungen speichern"
+
+#: advtrains/wagons.lua:965
+msgid "Text displayed outside on train"
+msgstr "Äußere Anzeige"
+
+#: advtrains/wagons.lua:966
+msgid "Text displayed inside train"
+msgstr "Innere Anzeige"
+
+#: advtrains/wagons.lua:967
+msgid "Line"
+msgstr "Linie"
+
+#: advtrains/wagons.lua:968
+msgid "Routingcode"
+msgstr ""
+
+#: advtrains/wagons.lua:1241
+msgid ""
+"Doors are closed. Use Sneak+rightclick to ignore the closed doors and get "
+"off."
+msgstr ""
+"Die Türen sind geschlossen. Nutzen Sie Schleichen+Rechtsklick, um trotz "
+"geschlossener Türen auszusteigen."
+
+#: advtrains/wagons.lua:1250
+msgid "You are not allowed to access the driver stand."
+msgstr "Sie haben keinen Zugang zum Führerstand."
+
+#: advtrains_interlocking/tsr_rail.lua:13
+msgid "Point speed restriction: @1"
+msgstr "Geschwindigkeitskontrolle: @1"
+
+#: advtrains_interlocking/tsr_rail.lua:14
+msgid "Set point speed restriction:"
+msgstr ""
+
+#: advtrains_interlocking/tsr_rail.lua:30
+msgid "You are not allowed to configure this track without the @1 privilege."
+msgstr "Sie dürfen ohne das „@1“-Privileg dieses Gleis nicht konfigurieren."
+
+#: advtrains_interlocking/tsr_rail.lua:34
+#: advtrains_line_automation/stoprail.lua:31
+#: advtrains_line_automation/stoprail.lua:76
+msgid "You are not allowed to configure this track."
+msgstr "Sie dürfen dieses Gleis nicht konfigurieren."
+
+#: advtrains_interlocking/tsr_rail.lua:64
+msgid "Point Speed Restriction Track"
+msgstr "Geschwindigkeitskontrollgleis"
+
+#: advtrains_line_automation/stoprail.lua:54
+msgid "Station Code"
+msgstr "Kennzeichen der Haltestelle"
+
+#: advtrains_line_automation/stoprail.lua:55
+msgid "Station Name"
+msgstr "Name der Haltestelle"
+
+#: advtrains_line_automation/stoprail.lua:56
+msgid "Door Delay"
+msgstr "Zeit für die Türschließung"
+
+#: advtrains_line_automation/stoprail.lua:57
+msgid "Dep. Speed"
+msgstr "Zielgeschwindigkeit bei Abfahrt"
+
+#: advtrains_line_automation/stoprail.lua:58 advtrains_train_track/init.lua:11
+#: advtrains_train_track/init.lua:156
+msgid "Track"
+msgstr "Gleis"
+
+#: advtrains_line_automation/stoprail.lua:59
+msgid "Stop Time"
+msgstr "Wartezeit"
+
+#: advtrains_line_automation/stoprail.lua:60
+msgid "Door Side"
+msgstr "Türseite"
+
+#: advtrains_line_automation/stoprail.lua:62
+msgid "Reverse train"
+msgstr "Zug Umkehren"
+
+#: advtrains_line_automation/stoprail.lua:63
+msgid "Kick out passengers"
+msgstr "Fahrgäste zum Ausstieg zwingen"
+
+#: advtrains_line_automation/stoprail.lua:97
+msgid "Station code \"@1\" already exists and is owned by @2."
+msgstr ""
+"Die Haltestelle mit dem Kennzeichen „@1“ ist bereits vorhanden und wird von "
+"@2 verwaltet."
+
+#: advtrains_line_automation/stoprail.lua:111
+msgid "This station is owned by @1. You are not allowed to edit its name."
+msgstr ""
+"Diese Haltestelle wird von @1 verwaltet. Sie dürfen sie nicht umbenennen."
+
+#: advtrains_line_automation/stoprail.lua:221
+msgid "Station/Stop Track"
+msgstr "Gleis zur Kennzeichnung einer Haltestelle"
+
+#: advtrains_luaautomation/active_common.lua:17
+msgid "Unconfigured LuaATC component"
+msgstr "Nicht konfiguierter LuaATC-Bauteil"
+
+#: advtrains_luaautomation/active_common.lua:46
+msgid "LuaATC Environment"
+msgstr ""
+
+#: advtrains_luaautomation/active_common.lua:49
+msgid "Clear Local Environment"
+msgstr ""
+
+#: advtrains_luaautomation/active_common.lua:50
+msgid "Code"
+msgstr ""
+
+#: advtrains_luaautomation/active_common.lua:64
+msgid ""
+"You are not allowed to configure this LuaATC component without the @1 "
+"privilege."
+msgstr ""
+"Sie dürfen ohne das „@1“-Privileg diesen LuaATC-Bauteil nicht konfigurieren."
+
+#: advtrains_luaautomation/active_common.lua:94
+msgid "LuaATC component assigned to environment '@1'"
+msgstr ""
+
+#: advtrains_luaautomation/active_common.lua:96
+msgid "LuaATC component assigned to an invalid environment"
+msgstr ""
+
+#: advtrains_luaautomation/active_common.lua:171
+msgid "LuaATC component with error: @1"
+msgstr "LuaATC-Bauteil mit Fehlermeldung: @1"
+
+#: advtrains_luaautomation/init.lua:13
+msgid ""
+"Can place and configure LuaATC components, including execute potentially "
+"harmful Lua code"
+msgstr ""
+"Kann LuaATC-Bauteile platzieren und konfigurieren (auch evtl. schädliche "
+"Programme ausführen)"
+
+#: advtrains_luaautomation/mesecon_controller.lua:211
+msgid "LuaATC Mesecon Controller"
+msgstr ""
+
+#: advtrains_luaautomation/operation_panel.lua:11
+msgid "LuaATC Operation Panel"
+msgstr ""
+
+#: advtrains_luaautomation/pcnaming.lua:28
+msgid ""
+"Passive Component Naming Tool\n"
+"\n"
+"Right-click to name a passive component."
+msgstr ""
+"PC-Benennungswerkzeug\n"
+"\n"
+"Rechtsklick zur Benennung der passiven Komponente."
+
+#: advtrains_luaautomation/pcnaming.lua:39
+msgid ""
+"You are not allowed to name LuaATC passive components without the @1 "
+"privilege."
+msgstr "Sie dürfen ohne das „@1“ keinen passiven LuaATC-Bauteil benennen."
+
+#: advtrains_luaautomation/pcnaming.lua:62
+msgid "Set name of component (empty to clear)"
+msgstr ""
+
+#: advtrains_train_industrial/init.lua:10
+#: advtrains_train_industrial/init.lua:49 advtrains_train_steam/init.lua:20
+#: advtrains_train_steam/init.lua:91
+msgid "Driver Stand (right)"
+msgstr "Führerstand Rechts"
+
+#: advtrains_train_industrial/init.lua:17
+#: advtrains_train_industrial/init.lua:56 advtrains_train_steam/init.lua:14
+#: advtrains_train_steam/init.lua:85
+msgid "Driver Stand (left)"
+msgstr "Führerstand Links"
+
+#: advtrains_train_industrial/init.lua:40
+msgid "Industrial Train Engine"
+msgstr "Industrielle Lokomotive"
+
+#: advtrains_train_industrial/init.lua:79
+msgid "Big Industrial Train Engine"
+msgstr "Große Industrielle Lokomotive"
+
+#: advtrains_train_industrial/init.lua:98
+msgid "Industrial tank wagon"
+msgstr "Tankwaggon"
+
+#: advtrains_train_industrial/init.lua:116
+msgid "Industrial wood wagon"
+msgstr "Holztransportwaggon"
+
+#: advtrains_train_japan/init.lua:4
+msgid "Japanese Train Inter-Wagon Connection"
+msgstr "Waggonzwischenverbindung Japanischer Personenzüge"
+
+#: advtrains_train_japan/init.lua:37
+msgid "Driver stand"
+msgstr "Führerstand"
+
+#: advtrains_train_japan/init.lua:101
+msgid "Japanese Train Engine"
+msgstr "Japanische Personenzug-Lokomotive"
+
+#: advtrains_train_japan/init.lua:176
+msgid "Japanese Train Wagon"
+msgstr "Japanischer Personenzug-Passagierwaggon"
+
+#: advtrains_train_steam/init.lua:75
+msgid "Steam Engine"
+msgstr "Dampflokomotive"
+
+#: advtrains_train_steam/init.lua:159
+msgid "Detailed Steam Engine"
+msgstr "Detaillierte Dampflokomotive"
+
+#: advtrains_train_steam/init.lua:206
+msgid "Passenger Wagon"
+msgstr "Passagierwaggon"
+
+#: advtrains_train_steam/init.lua:226
+msgid "Box Wagon"
+msgstr "Güterwaggon"
+
+#: advtrains_train_subway/init.lua:144
+msgid "Subway Passenger Wagon"
+msgstr "U-Bahn-Waggon"
+
+#: advtrains_train_track/init.lua:31
+msgid "Y-turnout"
+msgstr "Y-Weiche"
+
+#: advtrains_train_track/init.lua:49
+msgid "3-way turnout"
+msgstr "Dreiwegweiche"
+
+#: advtrains_train_track/init.lua:69
+msgid "Perpendicular Diamond Crossing Track"
+msgstr "Kreuzung mit zueinander orthogonalen Gleisen"
+
+#: advtrains_train_track/init.lua:91
+msgid "90+Angle Diamond Crossing Track"
+msgstr "Kreuzung mit einem achsenparallelen Gleis"
+
+#: advtrains_train_track/init.lua:132
+msgid "Diagonal Diamond Crossing Track"
+msgstr "Diagonale Gleiskreuzung"
+
+#: advtrains_train_track/init.lua:179
+msgid "Bumper"
+msgstr "Prellbock"
+
+#: advtrains_train_track/init.lua:201
+msgid "ATC controller"
+msgstr "Zugbeeinflussungsgleis"
+
+#: advtrains_train_track/init.lua:317
+msgid "Unloading Track"
+msgstr "Abladungsgleis"
+
+#: advtrains_train_track/init.lua:342
+msgid "Loading Track"
+msgstr "Beladungsgleis"
+
+#: advtrains_train_track/init.lua:406
+msgid "Detector Rail"
+msgstr "Detektorgleis"
+
+#~ msgid ""
+#~ "ATC controller, mode @1\n"
+#~ "Channel: @2"
+#~ msgstr ""
+#~ "Zugbeeinflussungsgleis in Betriebsart „@1“\n"
+#~ "Kanal: @2"
+
+#~ msgid "Access to @1"
+#~ msgstr "Zugang zu @1"
+
+#~ msgid "Can't get on: wagon full or doors closed!"
+#~ msgstr ""
+#~ "Sie können nicht einsteigen: der Waggon ist voll oder die Türen sind "
+#~ "geschlossen."
+
+#~ msgid "Can't place: protected position!"
+#~ msgstr "Es kann nicht platziert werden: diese Position ist geschützt."
+
+#~ msgid "Default Seat"
+#~ msgstr "Standardsitzplatz"
+
+#~ msgid "Default Seat (driver stand)"
+#~ msgstr "Standardsitzplatz (Führerstand)"
+
+#~ msgid "Deprecated Track"
+#~ msgstr "ausrangiertes Gleis, nicht verwenden."
+
+#~ msgid "Lock couples"
+#~ msgstr "Kupplungen sperren"
+
+#~ msgid "Speed:"
+#~ msgstr "Geschw.:"
+
+#~ msgid "Target:"
+#~ msgstr "Zielges.:"
+
+#~ msgid "This position is protected!"
+#~ msgstr "Diese Position ist geschützt!"
+
+#~ msgid "Use Sneak+rightclick to bypass closed doors!"
+#~ msgstr ""
+#~ "Nutzen Sie Schleichen+Rechtsklick, um trotz geschlossener Türen "
+#~ "einzusteigen."
+
+#, fuzzy
+#~ msgid "You are not allowed to modify this protected track."
+#~ msgstr "Sie dürfen an geschützten Stellen kein Gleis bauen."
+
+#~ msgid ""
+#~ "You need to own at least one neighboring wagon to destroy this couple."
+#~ msgstr ""
+#~ "Sie müssen Besitzer eines angrenzenden Waggons sein, um hier abzukuppeln."
diff --git a/advtrains/po/fr.po b/advtrains/po/fr.po
new file mode 100644
index 0000000..c744d2c
--- /dev/null
+++ b/advtrains/po/fr.po
@@ -0,0 +1,728 @@
+msgid ""
+msgstr ""
+"Project-Id-Version: advtrains\n"
+"Report-Msgid-Bugs-To: advtrains-discuss@lists.sr.ht\n"
+"POT-Creation-Date: 2023-10-09 11:02+0200\n"
+"PO-Revision-Date: 2024-11-02 21:31+0100\n"
+"Last-Translator: Tanavit <tanavit@posto.ovh>\n"
+"Language-Team: French\n"
+"Language: fr\n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+"X-Generator: Poedit 2.4.2\n"
+
+#: advtrains/atc.lua:109
+msgid "Unconfigured ATC controller"
+msgstr "Controlleur ATC, non-configuré"
+
+#: advtrains/atc.lua:150
+msgid ""
+"ATC controller, mode @1\n"
+"Command: @2"
+msgstr ""
+"Controlleur ATC, mode @1\n"
+"Commande : @2"
+
+#: advtrains/atc.lua:180
+msgid "Command"
+msgstr "Commande"
+
+#: advtrains/atc.lua:184
+msgid "Command (on)"
+msgstr "Commande (marche)"
+
+#: advtrains/atc.lua:187
+msgid "Digiline channel"
+msgstr "Canal Digiline"
+
+#: advtrains/atc.lua:189 advtrains_line_automation/stoprail.lua:65
+#: advtrains_luaautomation/active_common.lua:48
+msgid "Save"
+msgstr "Sauvegarder"
+
+#: advtrains/atc.lua:236
+msgid "ATC Reverse command warning: didn't reverse train, train moving."
+msgstr ""
+"Attention : Commande ATC de renversement impossible car le train se déplace."
+
+#: advtrains/atc.lua:248
+msgid "ATC Kick command warning: doors are closed."
+msgstr "Avertissement commande ATC Éjecter : portes closes."
+
+#: advtrains/atc.lua:252
+msgid "ATC Kick command warning: train moving."
+msgstr "Avertissement commande ATC Éjecter : train en mouvement."
+
+#: advtrains/atc.lua:322
+msgid "ATC command syntax error: I statement not closed: @1"
+msgstr "Erreur de syntaxe de commande ATC : instruction \"I\" incomplète : @1"
+
+#: advtrains/atc.lua:385
+msgid "ATC command parse error: Unknown command: @1"
+msgstr "Erreur d'analyse de commande ATC : Commande inconnue : @1"
+
+#: advtrains/copytool.lua:8
+msgid ""
+"Train copy/paste tool\n"
+"\n"
+"Left-click: copy train\n"
+"Right-click: paste train"
+msgstr ""
+"Outil de copie/collage de train\n"
+"\n"
+"Clic-Gauche : copie\n"
+"\n"
+"Clic-Droit : collage"
+
+#: advtrains/copytool.lua:29
+msgid "You do not have the @1 privilege."
+msgstr "Vous ne possédez pas le privilège \"@1\"."
+
+#: advtrains/copytool.lua:41
+msgid "The track you are trying to place the wagon on is not long enough."
+msgstr "La voie sur laquelle vous tentez de placer le wagon est trop courte."
+
+#: advtrains/copytool.lua:47
+msgid "The clipboard couldn't access the metadata. Paste failed."
+msgstr "Le presse-papier ne peut accéder aux métadonnées. Échec du collage."
+
+#: advtrains/copytool.lua:52 advtrains/copytool.lua:57
+msgid "The clipboard is empty."
+msgstr "Le presse-papier est vide."
+
+#: advtrains/copytool.lua:74
+msgid "Back of train would end up off track, cancelling."
+msgstr "La fin du train serait hors voie : annulation."
+
+#: advtrains/copytool.lua:92
+msgid "No such lua entity."
+msgstr "Pas de telle entité lua."
+
+#: advtrains/copytool.lua:98
+msgid "No such wagon: @1."
+msgstr "Pas de tel wagon : @1."
+
+#: advtrains/copytool.lua:104
+msgid "No such train: @1."
+msgstr "Pas de tel train : @1."
+
+#: advtrains/copytool.lua:176
+msgid "The clipboard couldn't access the metadata. Copy failed."
+msgstr "Le presse-papier ne peut accéder aux métadonnées. Échec de la copie."
+
+#: advtrains/copytool.lua:180
+msgid "Train copied."
+msgstr "Train copié."
+
+#: advtrains/couple.lua:28
+msgid "Buffer and Chain Coupler"
+msgstr "Attelage à tampon et vis"
+
+#: advtrains/couple.lua:29
+msgid "Scharfenberg Coupler"
+msgstr "Attelage Scharfenberg"
+
+#: advtrains/couple.lua:185
+msgid ""
+"You are not allowed to couple trains without the train_operator privilege."
+msgstr ""
+"Vous n'êtes pas autorisé à coupler des trains sans le privilège "
+"\"train_operator\"."
+
+#: advtrains/couple.lua:329 advtrains/couple.lua:333
+msgid "<No coupler>"
+msgstr "<Pas de coupleur>"
+
+#: advtrains/couple.lua:334
+msgid "Can not couple: The couplers of the trains do not match (@1 and @2)."
+msgstr ""
+"Accouplement impossible: les attelages des trains ne concordent pas (@1 et "
+"@2)."
+
+#: advtrains/craft_items.lua:3
+msgid "Boiler"
+msgstr "Chaudière à vapeur"
+
+#: advtrains/craft_items.lua:9
+msgid "Driver's cab"
+msgstr "Cabine de pilotage"
+
+#: advtrains/craft_items.lua:15
+msgid "Wheel"
+msgstr "Roue"
+
+#: advtrains/craft_items.lua:21
+msgid "Chimney"
+msgstr "Cheminée"
+
+#: advtrains/misc_nodes.lua:16
+msgid "@1 Platform (low)"
+msgstr "Quai @1 (bas)"
+
+#: advtrains/misc_nodes.lua:33
+msgid "@1 Platform (high)"
+msgstr "Quai @1 (haut)"
+
+#: advtrains/misc_nodes.lua:59
+msgid "@1 Platform (45 degree)"
+msgstr "Quai @1 (haut, 45°)"
+
+#: advtrains/misc_nodes.lua:81
+msgid "@1 Platform (low, 45 degree)"
+msgstr "Quai @1 (bas, 45°)"
+
+#: advtrains/protection.lua:7
+msgid "Can place, remove and operate trains"
+msgstr "Possibilité de poser, retirer ou opérer les trains"
+
+#: advtrains/protection.lua:12
+msgid ""
+"Can place, remove and operate any train, regardless of owner, whitelist, or "
+"protection"
+msgstr ""
+"Possibilité de poser, retirer ou opérer un quelconque train, indépendamment "
+"du propriétaire, de la liste blanche ou de protection"
+
+#: advtrains/protection.lua:18
+msgid "Can place and dig tracks in unprotected areas"
+msgstr "Possibilité de poser ou retirer des voies dans les zones non protégées"
+
+#: advtrains/protection.lua:24
+msgid "Can operate turnouts and signals in unprotected areas"
+msgstr ""
+"Possibilité d'opérer des embranchements et signaux dans les zones non "
+"protégées"
+
+#: advtrains/protection.lua:148
+msgid ""
+"You are not allowed to build near tracks without the track_builder privilege."
+msgstr ""
+"Vous ne pouvez pas construire à proximité d'une voie sans le privilège "
+"\"track_builder\" (?)"
+
+#: advtrains/protection.lua:148
+msgid ""
+"You are not allowed to build tracks without the track_builder privilege."
+msgstr ""
+"Vous ne pouvez pas construire une voie sans le privilège \"track_builder\"."
+
+#: advtrains/protection.lua:153
+msgid "You are not allowed to build near tracks at this protected position."
+msgstr ""
+"Vous ne pouvez pas construire à proximité d'une voie à cet emplacement "
+"protégé."
+
+#: advtrains/protection.lua:153
+msgid "You are not allowed to build tracks at this protected position."
+msgstr "Vous ne pouvez pas construire une voie à cet emplacement protégé."
+
+#: advtrains/protection.lua:184
+msgid ""
+"You are not allowed to operate turnouts and signals without the "
+"railway_operator privilege."
+msgstr ""
+"Vous ne pouvez pas actionner les aiguillages ou les signaux (privilège "
+"\"railway_operator\" manquant)"
+
+#: advtrains/signals.lua:63
+msgid "Lampless Signal"
+msgstr "Sémaphore"
+
+#: advtrains/signals.lua:127
+msgid "Signal"
+msgstr "Signal"
+
+#: advtrains/signals.lua:191
+msgid "Wallmounted Signal (left)"
+msgstr "Signal mural (gauche)"
+
+#: advtrains/signals.lua:192
+msgid "Wallmounted Signal (right)"
+msgstr "Signal mural (droit)"
+
+#: advtrains/signals.lua:193
+msgid "Wallmounted Signal (top)"
+msgstr "Signal mural (plafond)"
+
+#: advtrains/signals.lua:281 advtrains/signals.lua:322
+msgid "Andrew's Cross"
+msgstr "Croix de Saint André"
+
+#: advtrains/trackplacer.lua:313
+msgid ""
+"Track Worker Tool\n"
+"\n"
+"Left-click: change rail type (straight/curve/switch)\n"
+"Right-click: rotate object"
+msgstr ""
+"Outil \"Trackworker\"\n"
+"\n"
+"Clic-Gauche : change le type de rail (droit/courbé/aiguillage)\n"
+"\n"
+"Clic-Droit : tourne l'objet"
+
+#: advtrains/trackplacer.lua:340 advtrains/trackplacer.lua:377
+msgid "This node can't be rotated using the trackworker."
+msgstr "Ce nœud ne peut être tourné avec l'outil \"Trackworker\"."
+
+#: advtrains/trackplacer.lua:350
+msgid "This track can not be rotated."
+msgstr "Cette voie ne peut pas être tournée."
+
+#: advtrains/trackplacer.lua:404
+msgid "This node can't be changed using the trackworker."
+msgstr "Ce nœud ne peut être modifié avec l'outil \"Trackworker\"."
+
+#: advtrains/trackplacer.lua:414
+msgid "This track can not be changed."
+msgstr "Cette voie ne peut pas être modifiée."
+
+#: advtrains/tracks.lua:449
+msgid "This track can not be removed."
+msgstr "Cette voie ne peut pas être enlevée."
+
+#: advtrains/tracks.lua:616
+msgid "Position is occupied by a train."
+msgstr "Cet emplacement est occupé par un train."
+
+#: advtrains/tracks.lua:622
+msgid "There's a Track Circuit Break here."
+msgstr "Il y a un \"Track Circuit Break\" ici."
+
+#: advtrains/tracks.lua:626
+msgid "There's a Signal Influence Point here."
+msgstr "Il y a un \"Signal Influence Point\" ici."
+
+#: advtrains/tracks.lua:637
+msgid "@1 Slope"
+msgstr "Pente @1"
+
+#: advtrains/tracks.lua:648 advtrains/tracks.lua:653
+msgid "Can't place slope: not pointing at node."
+msgstr "Placement impossible : ne pointe pas un nœud."
+
+#: advtrains/tracks.lua:658
+msgid "Can't place slope: space occupied."
+msgstr "Placement impossible : espace occupé."
+
+#: advtrains/tracks.lua:711
+msgid "Can't place slope: Not enough slope items left (@1 required)."
+msgstr ""
+"Placement impossible : quantité insuffisante de voie pentue (@1 manquant)."
+
+#: advtrains/tracks.lua:714
+msgid "Can't place slope: There's no slope of length @1."
+msgstr "Placement impossible : il n'y a pas de voie pentue de longueur @1."
+
+#: advtrains/tracks.lua:721
+msgid "Can't place slope: no supporting node at upper end."
+msgstr "Placement impossible : pas de nœud d'appui à l'extrémité supérieure."
+
+#: advtrains/trainhud.lua:305
+msgid "OVERRUN RED SIGNAL! Examine situation and reverse train to move again."
+msgstr ""
+"Franchissement de signal rouge : examinez la situation et inversez le sens "
+"de marche du train."
+
+#: advtrains/wagons.lua:179
+msgid "This wagon is owned by @1, you can't destroy it."
+msgstr "Ce wagon est la propriété de @1, vous ne pouvez pas le détruire."
+
+#: advtrains/wagons.lua:203
+msgid "The wagon's inventory is not empty."
+msgstr "Le stock de ce wagon n'est pas vide."
+
+#: advtrains/wagons.lua:210
+msgid "Wagon needs to be decoupled from other wagons in order to destroy it."
+msgstr ""
+"Les wagons doivent être désaccouplés des autres pour pouvoir être détruits."
+
+#: advtrains/wagons.lua:216
+msgid ""
+"Warning: If you destroy this wagon, you only get some steel back! If you are "
+"sure, hold Sneak and left-click the wagon."
+msgstr ""
+"Attention: Si vous détruisez ce wagon, vous ne récupérerez que de la "
+"ferraille ! Si vous êtes sûr de vous, appuyez la touche \"Marcher lentement "
+"(Sneak)\" et Clic-Gauche."
+
+#: advtrains/wagons.lua:649 advtrains/wagons.lua:850
+msgid "Show Inventory"
+msgstr "Montrer le stock"
+
+#: advtrains/wagons.lua:652
+msgid "Onboard Computer"
+msgstr "Ordinateur embarqué"
+
+#: advtrains/wagons.lua:655 advtrains/wagons.lua:1328
+msgid "Wagon properties"
+msgstr "Propriétés du wagon"
+
+#: advtrains/wagons.lua:658
+msgid "Get off"
+msgstr "Débarquer"
+
+#: advtrains/wagons.lua:661
+msgid "Get off (forced)"
+msgstr "Débarquer (de force)"
+
+#: advtrains/wagons.lua:663
+msgid "(Doors closed)"
+msgstr "(Portes closes)"
+
+#: advtrains/wagons.lua:692
+msgid "This wagon has no seats."
+msgstr "Ce wagon n'a pas de siège."
+
+#: advtrains/wagons.lua:703
+msgid "This wagon is full."
+msgstr "Ce wagon est plein."
+
+#: advtrains/wagons.lua:706
+msgid "Doors are closed! (Try holding sneak key!)"
+msgstr "Portes closes : (Essayez la \"sneak key\"!\")"
+
+#: advtrains/wagons.lua:712
+msgid "You can't get on this wagon."
+msgstr "Montée impossible dans ce wagon."
+
+#: advtrains/wagons.lua:838
+msgid "Select seat:"
+msgstr "Choisir le siège :"
+
+#: advtrains/wagons.lua:880
+msgid "Save wagon properties"
+msgstr "Sauvegarder les propriétés du wagon"
+
+#: advtrains/wagons.lua:965
+msgid "Text displayed outside on train"
+msgstr "Texte affiché à l'extérieur du train"
+
+#: advtrains/wagons.lua:966
+msgid "Text displayed inside train"
+msgstr "Texte affiché à l'intérieur du train"
+
+#: advtrains/wagons.lua:967
+msgid "Line"
+msgstr "Ligne"
+
+#: advtrains/wagons.lua:968
+msgid "Routingcode"
+msgstr "Code de routage"
+
+#: advtrains/wagons.lua:1241
+msgid ""
+"Doors are closed. Use Sneak+rightclick to ignore the closed doors and get "
+"off."
+msgstr ""
+"Portes closes ! Utilisez \"Marcher lentement (Sneak)\" et Clic-Droit pour "
+"franchir les portes et débarquer."
+
+#: advtrains/wagons.lua:1250
+msgid "You are not allowed to access the driver stand."
+msgstr "Accès interdit au poste de pilotage."
+
+#: advtrains_interlocking/tsr_rail.lua:13
+msgid "Point speed restriction: @1"
+msgstr "Point de limitation de vitesse : @1"
+
+#: advtrains_interlocking/tsr_rail.lua:14
+msgid "Set point speed restriction:"
+msgstr "Placez un point de limitation de vitesse :"
+
+#: advtrains_interlocking/tsr_rail.lua:30
+msgid "You are not allowed to configure this track without the @1 privilege."
+msgstr "Vous n'êtes pas autorisé à configurer cette voie sans le privilège @1."
+
+#: advtrains_interlocking/tsr_rail.lua:34
+#: advtrains_line_automation/stoprail.lua:31
+#: advtrains_line_automation/stoprail.lua:76
+msgid "You are not allowed to configure this track."
+msgstr "Vous n'êtes pas autorisé à configurer cette voie."
+
+#: advtrains_interlocking/tsr_rail.lua:64
+msgid "Point Speed Restriction Track"
+msgstr "Voie de point de limitation de vitesse"
+
+#: advtrains_line_automation/stoprail.lua:54
+msgid "Station Code"
+msgstr "Code de Station"
+
+#: advtrains_line_automation/stoprail.lua:55
+msgid "Station Name"
+msgstr "Nom de Station"
+
+#: advtrains_line_automation/stoprail.lua:56
+msgid "Door Delay"
+msgstr "Durée d'ouverture des portes"
+
+#: advtrains_line_automation/stoprail.lua:57
+msgid "Dep. Speed"
+msgstr "Vitesse de départ"
+
+#: advtrains_line_automation/stoprail.lua:58 advtrains_train_track/init.lua:11
+#: advtrains_train_track/init.lua:156
+msgid "Track"
+msgstr "Voie"
+
+#: advtrains_line_automation/stoprail.lua:59
+msgid "Stop Time"
+msgstr "Durée d'arrêt"
+
+#: advtrains_line_automation/stoprail.lua:60
+msgid "Door Side"
+msgstr "Coté d'ouvertures des portes"
+
+#: advtrains_line_automation/stoprail.lua:62
+msgid "Reverse train"
+msgstr "Inversion du sens de marche"
+
+#: advtrains_line_automation/stoprail.lua:63
+msgid "Kick out passengers"
+msgstr "Éjecter les passagers"
+
+#: advtrains_line_automation/stoprail.lua:97
+msgid "Station code \"@1\" already exists and is owned by @2."
+msgstr "Le code de station \"@1\" existe et est possédé par @2."
+
+#: advtrains_line_automation/stoprail.lua:111
+msgid "This station is owned by @1. You are not allowed to edit its name."
+msgstr ""
+"Cette station est la propriété de @1. Vous n'êtes pas autorisé à modifier "
+"son nom."
+
+#: advtrains_line_automation/stoprail.lua:221
+msgid "Station/Stop Track"
+msgstr "Voie d'arrêt en station"
+
+#: advtrains_luaautomation/active_common.lua:17
+msgid "Unconfigured LuaATC component"
+msgstr "Composant LuaATC non configuré"
+
+#: advtrains_luaautomation/active_common.lua:46
+msgid "LuaATC Environment"
+msgstr "Environnement LuaATC"
+
+#: advtrains_luaautomation/active_common.lua:49
+msgid "Clear Local Environment"
+msgstr "Effacer l'environnement LuaATC"
+
+#: advtrains_luaautomation/active_common.lua:50
+msgid "Code"
+msgstr "Code"
+
+#: advtrains_luaautomation/active_common.lua:64
+msgid ""
+"You are not allowed to configure this LuaATC component without the @1 "
+"privilege."
+msgstr "Vous ne pouvez configurer ce composant LuaATC sans le privilege @1."
+
+#: advtrains_luaautomation/active_common.lua:94
+msgid "LuaATC component assigned to environment '@1'"
+msgstr "Composant LuaATC assigné à l'environnement '@1'"
+
+#: advtrains_luaautomation/active_common.lua:96
+msgid "LuaATC component assigned to an invalid environment"
+msgstr "Composant LuaATC assigné à un environnement invalide"
+
+#: advtrains_luaautomation/active_common.lua:171
+msgid "LuaATC component with error: @1"
+msgstr "Erreur @1 du composant LuaATC"
+
+#: advtrains_luaautomation/init.lua:13
+msgid ""
+"Can place and configure LuaATC components, including execute potentially "
+"harmful Lua code"
+msgstr ""
+"Permet le placement et la configuration de composants LuaATC avec risque "
+"d'exécution de code Lua dangereux"
+
+#: advtrains_luaautomation/mesecon_controller.lua:211
+msgid "LuaATC Mesecon Controller"
+msgstr "Commande Mesecon de LuaATC"
+
+#: advtrains_luaautomation/operation_panel.lua:11
+msgid "LuaATC Operation Panel"
+msgstr "Panneau de commande de LuaATC"
+
+#: advtrains_luaautomation/pcnaming.lua:28
+msgid ""
+"Passive Component Naming Tool\n"
+"\n"
+"Right-click to name a passive component."
+msgstr ""
+"Outil de nommage de composant passif\n"
+"\n"
+"Clic-Droit pour nommer un composant passif."
+
+#: advtrains_luaautomation/pcnaming.lua:39
+msgid ""
+"You are not allowed to name LuaATC passive components without the @1 "
+"privilege."
+msgstr "Vous ne pouvez nommer un composant LuaATC passif sans le privilege @1."
+
+#: advtrains_luaautomation/pcnaming.lua:62
+msgid "Set name of component (empty to clear)"
+msgstr "Nommer le composant (chaîne vide pour effacer)"
+
+#: advtrains_train_industrial/init.lua:10
+#: advtrains_train_industrial/init.lua:49 advtrains_train_steam/init.lua:20
+#: advtrains_train_steam/init.lua:91
+msgid "Driver Stand (right)"
+msgstr "Poste de pilotage (droit)"
+
+#: advtrains_train_industrial/init.lua:17
+#: advtrains_train_industrial/init.lua:56 advtrains_train_steam/init.lua:14
+#: advtrains_train_steam/init.lua:85
+msgid "Driver Stand (left)"
+msgstr "Poste de pilotage (gauche)"
+
+#: advtrains_train_industrial/init.lua:40
+msgid "Industrial Train Engine"
+msgstr "Locomotive industrielle"
+
+#: advtrains_train_industrial/init.lua:79
+msgid "Big Industrial Train Engine"
+msgstr "Grosse locomotive industrielle"
+
+#: advtrains_train_industrial/init.lua:98
+msgid "Industrial tank wagon"
+msgstr "Wagon-citerne industriel"
+
+#: advtrains_train_industrial/init.lua:116
+msgid "Industrial wood wagon"
+msgstr "Wagon grumier industriel"
+
+#: advtrains_train_japan/init.lua:4
+msgid "Japanese Train Inter-Wagon Connection"
+msgstr "Passage inter-voiture de train Japonais"
+
+#: advtrains_train_japan/init.lua:37
+msgid "Driver stand"
+msgstr "Poste de pilotage"
+
+#: advtrains_train_japan/init.lua:101
+msgid "Japanese Train Engine"
+msgstr "Motrice Japonaise"
+
+#: advtrains_train_japan/init.lua:176
+msgid "Japanese Train Wagon"
+msgstr "Voiture Japonaise"
+
+#: advtrains_train_steam/init.lua:75
+msgid "Steam Engine"
+msgstr "Locomotive à vapeur"
+
+#: advtrains_train_steam/init.lua:159
+msgid "Detailed Steam Engine"
+msgstr "Locomotive à vapeur complexe"
+
+#: advtrains_train_steam/init.lua:206
+msgid "Passenger Wagon"
+msgstr "Voiture passager"
+
+#: advtrains_train_steam/init.lua:226
+msgid "Box Wagon"
+msgstr "Wagon de frêt"
+
+#: advtrains_train_subway/init.lua:144
+msgid "Subway Passenger Wagon"
+msgstr "Voiture de Métropolitain"
+
+#: advtrains_train_track/init.lua:31
+msgid "Y-turnout"
+msgstr "Embranchement en Y"
+
+#: advtrains_train_track/init.lua:49
+msgid "3-way turnout"
+msgstr "Embranchement triple"
+
+#: advtrains_train_track/init.lua:69
+msgid "Perpendicular Diamond Crossing Track"
+msgstr "Croisement perpendiculaire"
+
+#: advtrains_train_track/init.lua:91
+msgid "90+Angle Diamond Crossing Track"
+msgstr "Croisement perpendiculo-diagonal"
+
+#: advtrains_train_track/init.lua:132
+msgid "Diagonal Diamond Crossing Track"
+msgstr "Croisement diagonal"
+
+#: advtrains_train_track/init.lua:179
+msgid "Bumper"
+msgstr "Heurtoir"
+
+#: advtrains_train_track/init.lua:201
+msgid "ATC controller"
+msgstr "Controlleur ATC"
+
+#: advtrains_train_track/init.lua:317
+msgid "Unloading Track"
+msgstr "Voie de Déchargement"
+
+#: advtrains_train_track/init.lua:342
+msgid "Loading Track"
+msgstr "Voie de Chargement"
+
+#: advtrains_train_track/init.lua:406
+msgid "Detector Rail"
+msgstr "Voie détectrice"
+
+#~ msgid ""
+#~ "ATC controller, mode @1\n"
+#~ "Channel: @2"
+#~ msgstr ""
+#~ "Controlleur ATC, mode @1\n"
+#~ "Canal : @2"
+
+#~ msgid "Access to @1"
+#~ msgstr "Accès à @1"
+
+#~ msgid "Can't get on: wagon full or doors closed!"
+#~ msgstr ""
+#~ "Embarquement impossible : le wagon est plein ou ses portes sont closes !"
+
+#~ msgid "Can't place: protected position!"
+#~ msgstr "Placement impossible : emplacement protégé"
+
+#~ msgid "Default Seat"
+#~ msgstr "Siège par défaut"
+
+#~ msgid "Default Seat (driver stand)"
+#~ msgstr "Siège par défaut (poste de pilotage)"
+
+#~ msgid "Deprecated Track"
+#~ msgstr "Voie déconseillée"
+
+#~ msgid "Lock couples"
+#~ msgstr "Verrouiller l'accouplement"
+
+#~ msgid "Speed:"
+#~ msgstr "Vitesse : "
+
+#~ msgid "Target:"
+#~ msgstr "Destination : "
+
+#, fuzzy
+#~ msgid "This node can't be rotated using the trackworker,"
+#~ msgstr "Ce nœud ne peut être tourné avec l'outil \"Trackworker\" !"
+
+#~ msgid "This position is protected!"
+#~ msgstr "Cet emplacement est protégé !"
+
+#~ msgid "Use Sneak+rightclick to bypass closed doors!"
+#~ msgstr ""
+#~ "Utilisez \"Marcher lentement (Sneak)\" et Clic-Droit pour franchir les "
+#~ "portes closes !"
+
+#, fuzzy
+#~ msgid "You are not allowed to modify this protected track."
+#~ msgstr "Vous ne pouvez pas construire une voie à cet emplacement protégé"
+
+#~ msgid ""
+#~ "You need to own at least one neighboring wagon to destroy this couple."
+#~ msgstr ""
+#~ "Vous devez être propriétaire d'au moins un wagon voisin pour supprimer "
+#~ "cet attelage."
diff --git a/advtrains/po/update-translations.sh b/advtrains/po/update-translations.sh
new file mode 100755
index 0000000..3a56c7c
--- /dev/null
+++ b/advtrains/po/update-translations.sh
@@ -0,0 +1,28 @@
+#!/bin/sh
+# NOTE: Please make sure you also have basic_trains installed, as it uses attrans for historical reasons
+
+PODIR=`dirname "$0"`
+ATDIR="$PODIR/../.."
+BTDIR="$ATDIR/../basic_trains"
+POTFILE="$PODIR/advtrains.pot"
+
+xgettext \
+	-D "$ATDIR" \
+	-D "$BTDIR" \
+	-d advtrains \
+	-o "$POTFILE" \
+	-p . \
+	-L lua \
+	--from-code=UTF-8 \
+	--sort-by-file \
+	--keyword='attrans' \
+	--keyword='S' \
+	--package-name='advtrains' \
+	--msgid-bugs-address='advtrains-discuss@lists.sr.ht' \
+	`find $ATDIR $BTDIR -name '*.lua' -printf '%P\n'` \
+	&&
+for i in "$PODIR"/*.po; do
+	msgmerge -U \
+		--sort-by-file \
+		$i "$POTFILE"
+done
diff --git a/advtrains/po/zh_CN.po b/advtrains/po/zh_CN.po
new file mode 100644
index 0000000..5bcc316
--- /dev/null
+++ b/advtrains/po/zh_CN.po
@@ -0,0 +1,696 @@
+msgid ""
+msgstr ""
+"Project-Id-Version: advtrains\n"
+"Report-Msgid-Bugs-To: advtrains-discuss@lists.sr.ht\n"
+"POT-Creation-Date: 2023-10-09 11:02+0200\n"
+"PO-Revision-Date: 2023-10-09 11:24+0200\n"
+"Last-Translator: Y. Wang <yw05@forksworld.de>\n"
+"Language-Team: Chinese (Simplified)\n"
+"Language: zh_CN\n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+"X-Generator: Poedit 3.3.2\n"
+
+#: advtrains/atc.lua:109
+msgid "Unconfigured ATC controller"
+msgstr "ATC 控制器 (未配置)"
+
+#: advtrains/atc.lua:150
+msgid ""
+"ATC controller, mode @1\n"
+"Command: @2"
+msgstr ""
+"ATC 控制器\n"
+"模式：@1\n"
+"命令：@2"
+
+#: advtrains/atc.lua:180
+msgid "Command"
+msgstr "命令"
+
+#: advtrains/atc.lua:184
+msgid "Command (on)"
+msgstr "命令 (激活时)"
+
+#: advtrains/atc.lua:187
+msgid "Digiline channel"
+msgstr "Digiline 频道"
+
+#: advtrains/atc.lua:189 advtrains_line_automation/stoprail.lua:65
+#: advtrains_luaautomation/active_common.lua:48
+msgid "Save"
+msgstr "保存"
+
+#: advtrains/atc.lua:236
+msgid "ATC Reverse command warning: didn't reverse train, train moving."
+msgstr "ATC 警告：火车正在移动，无法改变行车方向。"
+
+#: advtrains/atc.lua:248
+msgid "ATC Kick command warning: doors are closed."
+msgstr "ATC 警告：车门已关闭，无法踢出乘客。"
+
+#: advtrains/atc.lua:252
+msgid "ATC Kick command warning: train moving."
+msgstr "ATC 警告：火车正在移动，无法踢出乘客。"
+
+#: advtrains/atc.lua:322
+msgid "ATC command syntax error: I statement not closed: @1"
+msgstr "ATC 语法错误：“I”命令不完整：@1"
+
+#: advtrains/atc.lua:385
+msgid "ATC command parse error: Unknown command: @1"
+msgstr "ATC 语法错误：未知命令：@1"
+
+#: advtrains/copytool.lua:8
+msgid ""
+"Train copy/paste tool\n"
+"\n"
+"Left-click: copy train\n"
+"Right-click: paste train"
+msgstr ""
+"火车复制工具\n"
+"\n"
+"左键单击：复制\n"
+"右键单击：粘帖"
+
+#: advtrains/copytool.lua:29
+msgid "You do not have the @1 privilege."
+msgstr "您没有“@1”权限。"
+
+#: advtrains/copytool.lua:41
+msgid "The track you are trying to place the wagon on is not long enough."
+msgstr "轨道太短。"
+
+#: advtrains/copytool.lua:47
+msgid "The clipboard couldn't access the metadata. Paste failed."
+msgstr "无法粘贴：剪贴板无法访问元数据。"
+
+#: advtrains/copytool.lua:52 advtrains/copytool.lua:57
+msgid "The clipboard is empty."
+msgstr "剪贴板是空的。"
+
+#: advtrains/copytool.lua:74
+msgid "Back of train would end up off track, cancelling."
+msgstr "火车后部不在轨道上。"
+
+#: advtrains/copytool.lua:92
+msgid "No such lua entity."
+msgstr "您没有指向一个可以用火车复制工具复制的物体。"
+
+#: advtrains/copytool.lua:98
+msgid "No such wagon: @1."
+msgstr "ID 为“@1”的车厢不存在。"
+
+#: advtrains/copytool.lua:104
+msgid "No such train: @1."
+msgstr "ID 为“@1”的列车不存在。"
+
+#: advtrains/copytool.lua:176
+msgid "The clipboard couldn't access the metadata. Copy failed."
+msgstr "无法复制：剪贴板无法访问元数据。"
+
+#: advtrains/copytool.lua:180
+msgid "Train copied."
+msgstr "已复制列车。"
+
+#: advtrains/couple.lua:28
+msgid "Buffer and Chain Coupler"
+msgstr "链式车钩"
+
+#: advtrains/couple.lua:29
+msgid "Scharfenberg Coupler"
+msgstr "Scharfenberg 式车钩"
+
+#: advtrains/couple.lua:185
+msgid ""
+"You are not allowed to couple trains without the train_operator privilege."
+msgstr "您没有“train_operator”权限，不能连接这两节车厢。"
+
+#: advtrains/couple.lua:329 advtrains/couple.lua:333
+msgid "<No coupler>"
+msgstr "<没有车钩>"
+
+#: advtrains/couple.lua:334
+msgid "Can not couple: The couplers of the trains do not match (@1 and @2)."
+msgstr "您无法连接这两节车厢：这两节车厢使用不同的车钩 (@1和@2)。"
+
+#: advtrains/craft_items.lua:3
+msgid "Boiler"
+msgstr "锅炉"
+
+#: advtrains/craft_items.lua:9
+msgid "Driver's cab"
+msgstr "驾驶室"
+
+#: advtrains/craft_items.lua:15
+msgid "Wheel"
+msgstr "车轮"
+
+#: advtrains/craft_items.lua:21
+msgid "Chimney"
+msgstr "烟囱"
+
+#: advtrains/misc_nodes.lua:16
+msgid "@1 Platform (low)"
+msgstr "较低的@1站台"
+
+#: advtrains/misc_nodes.lua:33
+msgid "@1 Platform (high)"
+msgstr "较高的@1站台"
+
+#: advtrains/misc_nodes.lua:59
+msgid "@1 Platform (45 degree)"
+msgstr "较高的@1站台 (45°)"
+
+#: advtrains/misc_nodes.lua:81
+msgid "@1 Platform (low, 45 degree)"
+msgstr "较低的@1站台 (45°)"
+
+#: advtrains/protection.lua:7
+msgid "Can place, remove and operate trains"
+msgstr ""
+
+#: advtrains/protection.lua:12
+msgid ""
+"Can place, remove and operate any train, regardless of owner, whitelist, or "
+"protection"
+msgstr ""
+
+#: advtrains/protection.lua:18
+msgid "Can place and dig tracks in unprotected areas"
+msgstr ""
+
+#: advtrains/protection.lua:24
+msgid "Can operate turnouts and signals in unprotected areas"
+msgstr ""
+
+#: advtrains/protection.lua:148
+msgid ""
+"You are not allowed to build near tracks without the track_builder privilege."
+msgstr "您没有“train_operator”权限，不能在铁路附近建任何东西。"
+
+#: advtrains/protection.lua:148
+msgid ""
+"You are not allowed to build tracks without the track_builder privilege."
+msgstr "您没有“train_operator”权限，不能在这里建造铁路。"
+
+#: advtrains/protection.lua:153
+msgid "You are not allowed to build near tracks at this protected position."
+msgstr "这里已被保护，您不能在这里的铁路附近建任何东西。"
+
+#: advtrains/protection.lua:153
+msgid "You are not allowed to build tracks at this protected position."
+msgstr "这里已被保护，您不能在这里建造铁路。"
+
+#: advtrains/protection.lua:184
+msgid ""
+"You are not allowed to operate turnouts and signals without the "
+"railway_operator privilege."
+msgstr "您没有“railway_operator”权限，不能控制铁路设施。"
+
+#: advtrains/signals.lua:63
+msgid "Lampless Signal"
+msgstr "臂板信号机"
+
+#: advtrains/signals.lua:127
+msgid "Signal"
+msgstr "信号灯"
+
+#: advtrains/signals.lua:191
+msgid "Wallmounted Signal (left)"
+msgstr "壁挂式信号灯 (左侧)"
+
+#: advtrains/signals.lua:192
+msgid "Wallmounted Signal (right)"
+msgstr "壁挂式信号灯 (右侧)"
+
+#: advtrains/signals.lua:193
+msgid "Wallmounted Signal (top)"
+msgstr "悬挂式信号灯"
+
+#: advtrains/signals.lua:281 advtrains/signals.lua:322
+msgid "Andrew's Cross"
+msgstr "铁路道口信号灯"
+
+#: advtrains/trackplacer.lua:313
+msgid ""
+"Track Worker Tool\n"
+"\n"
+"Left-click: change rail type (straight/curve/switch)\n"
+"Right-click: rotate object"
+msgstr ""
+"铁路调整工具\n"
+"\n"
+"左键单击：切换轨道类型\n"
+"右键单击：旋转方块"
+
+#: advtrains/trackplacer.lua:340 advtrains/trackplacer.lua:377
+msgid "This node can't be rotated using the trackworker."
+msgstr "您不能使用铁路调整工具旋转这个方块。"
+
+#: advtrains/trackplacer.lua:350
+msgid "This track can not be rotated."
+msgstr "您不能旋转这段轨道。"
+
+#: advtrains/trackplacer.lua:404
+msgid "This node can't be changed using the trackworker."
+msgstr "您不能使用铁路调整工具调整这个方块。"
+
+#: advtrains/trackplacer.lua:414
+msgid "This track can not be changed."
+msgstr "您不能调整这段轨道。"
+
+#: advtrains/tracks.lua:449
+msgid "This track can not be removed."
+msgstr "您不能移除这段轨道。"
+
+#: advtrains/tracks.lua:616
+msgid "Position is occupied by a train."
+msgstr ""
+
+#: advtrains/tracks.lua:622
+msgid "There's a Track Circuit Break here."
+msgstr ""
+
+#: advtrains/tracks.lua:626
+msgid "There's a Signal Influence Point here."
+msgstr ""
+
+#: advtrains/tracks.lua:637
+msgid "@1 Slope"
+msgstr "@1斜坡"
+
+#: advtrains/tracks.lua:648 advtrains/tracks.lua:653
+msgid "Can't place slope: not pointing at node."
+msgstr "无法放置斜坡：您没有选择任何方块。"
+
+#: advtrains/tracks.lua:658
+msgid "Can't place slope: space occupied."
+msgstr "无法放置斜坡：此区域已被占用。"
+
+#: advtrains/tracks.lua:711
+msgid "Can't place slope: Not enough slope items left (@1 required)."
+msgstr "无法放置斜坡：您没有足够的铁路斜坡放置工具 (您总共需要@1个)"
+
+#: advtrains/tracks.lua:714
+msgid "Can't place slope: There's no slope of length @1."
+msgstr "无法放置斜坡：advtrains 不支持长度为@1米的斜坡。"
+
+#: advtrains/tracks.lua:721
+msgid "Can't place slope: no supporting node at upper end."
+msgstr "无法放置斜坡：较高端没有支撑方块。"
+
+#: advtrains/trainhud.lua:305
+msgid "OVERRUN RED SIGNAL! Examine situation and reverse train to move again."
+msgstr ""
+
+#: advtrains/wagons.lua:179
+msgid "This wagon is owned by @1, you can't destroy it."
+msgstr "这是 @1 的车厢，您不能摧毁它。"
+
+#: advtrains/wagons.lua:203
+msgid "The wagon's inventory is not empty."
+msgstr ""
+
+#: advtrains/wagons.lua:210
+msgid "Wagon needs to be decoupled from other wagons in order to destroy it."
+msgstr ""
+
+#: advtrains/wagons.lua:216
+msgid ""
+"Warning: If you destroy this wagon, you only get some steel back! If you are "
+"sure, hold Sneak and left-click the wagon."
+msgstr ""
+"警告：如果您摧毁此车厢，您只能拿到一些钢方块。如果您确定要摧毁这节车厢，请按"
+"潜行键并左键单击此车厢。"
+
+#: advtrains/wagons.lua:649 advtrains/wagons.lua:850
+msgid "Show Inventory"
+msgstr "显示物品栏"
+
+#: advtrains/wagons.lua:652
+msgid "Onboard Computer"
+msgstr ""
+
+#: advtrains/wagons.lua:655 advtrains/wagons.lua:1328
+msgid "Wagon properties"
+msgstr "车厢属性"
+
+#: advtrains/wagons.lua:658
+msgid "Get off"
+msgstr "下车"
+
+#: advtrains/wagons.lua:661
+msgid "Get off (forced)"
+msgstr "强制下车"
+
+#: advtrains/wagons.lua:663
+msgid "(Doors closed)"
+msgstr "(车门已关闭)"
+
+#: advtrains/wagons.lua:692
+msgid "This wagon has no seats."
+msgstr "这节车厢没有座位。"
+
+#: advtrains/wagons.lua:703
+msgid "This wagon is full."
+msgstr "车厢已满。"
+
+#: advtrains/wagons.lua:706
+msgid "Doors are closed! (Try holding sneak key!)"
+msgstr ""
+
+#: advtrains/wagons.lua:712
+msgid "You can't get on this wagon."
+msgstr ""
+
+#: advtrains/wagons.lua:838
+msgid "Select seat:"
+msgstr "请选择座位："
+
+#: advtrains/wagons.lua:880
+msgid "Save wagon properties"
+msgstr "保存车厢属性"
+
+#: advtrains/wagons.lua:965
+msgid "Text displayed outside on train"
+msgstr "车厢外部显示"
+
+#: advtrains/wagons.lua:966
+msgid "Text displayed inside train"
+msgstr "车厢内部显示"
+
+#: advtrains/wagons.lua:967
+msgid "Line"
+msgstr "火车线路"
+
+#: advtrains/wagons.lua:968
+msgid "Routingcode"
+msgstr "路由码"
+
+#: advtrains/wagons.lua:1241
+msgid ""
+"Doors are closed. Use Sneak+rightclick to ignore the closed doors and get "
+"off."
+msgstr "车门已关闭，请使用潜行+右键单击下车。"
+
+#: advtrains/wagons.lua:1250
+msgid "You are not allowed to access the driver stand."
+msgstr ""
+
+#: advtrains_interlocking/tsr_rail.lua:13
+msgid "Point speed restriction: @1"
+msgstr ""
+
+#: advtrains_interlocking/tsr_rail.lua:14
+msgid "Set point speed restriction:"
+msgstr ""
+
+#: advtrains_interlocking/tsr_rail.lua:30
+msgid "You are not allowed to configure this track without the @1 privilege."
+msgstr "您没有“@1”权限，不能调整这段轨道。"
+
+#: advtrains_interlocking/tsr_rail.lua:34
+#: advtrains_line_automation/stoprail.lua:31
+#: advtrains_line_automation/stoprail.lua:76
+msgid "You are not allowed to configure this track."
+msgstr "您不能调整这段轨道。"
+
+#: advtrains_interlocking/tsr_rail.lua:64
+msgid "Point Speed Restriction Track"
+msgstr ""
+
+#: advtrains_line_automation/stoprail.lua:54
+msgid "Station Code"
+msgstr "车站代码"
+
+#: advtrains_line_automation/stoprail.lua:55
+msgid "Station Name"
+msgstr "车站名称"
+
+#: advtrains_line_automation/stoprail.lua:56
+msgid "Door Delay"
+msgstr "车门关闭时间"
+
+#: advtrains_line_automation/stoprail.lua:57
+msgid "Dep. Speed"
+msgstr "出发速度"
+
+#: advtrains_line_automation/stoprail.lua:58 advtrains_train_track/init.lua:11
+#: advtrains_train_track/init.lua:156
+msgid "Track"
+msgstr "轨道"
+
+#: advtrains_line_automation/stoprail.lua:59
+msgid "Stop Time"
+msgstr "停站时间"
+
+#: advtrains_line_automation/stoprail.lua:60
+msgid "Door Side"
+msgstr ""
+
+#: advtrains_line_automation/stoprail.lua:62
+msgid "Reverse train"
+msgstr "改变行车方向"
+
+#: advtrains_line_automation/stoprail.lua:63
+msgid "Kick out passengers"
+msgstr "踢出乘客"
+
+#: advtrains_line_automation/stoprail.lua:97
+msgid "Station code \"@1\" already exists and is owned by @2."
+msgstr ""
+
+#: advtrains_line_automation/stoprail.lua:111
+msgid "This station is owned by @1. You are not allowed to edit its name."
+msgstr ""
+
+#: advtrains_line_automation/stoprail.lua:221
+msgid "Station/Stop Track"
+msgstr "车站轨道"
+
+#: advtrains_luaautomation/active_common.lua:17
+msgid "Unconfigured LuaATC component"
+msgstr "LuaATC 部件 (未配置)"
+
+#: advtrains_luaautomation/active_common.lua:46
+msgid "LuaATC Environment"
+msgstr ""
+
+#: advtrains_luaautomation/active_common.lua:49
+msgid "Clear Local Environment"
+msgstr ""
+
+#: advtrains_luaautomation/active_common.lua:50
+msgid "Code"
+msgstr ""
+
+#: advtrains_luaautomation/active_common.lua:64
+msgid ""
+"You are not allowed to configure this LuaATC component without the @1 "
+"privilege."
+msgstr "您没有“@1”权限，不能配置这个 LuaATC 部件。"
+
+#: advtrains_luaautomation/active_common.lua:94
+msgid "LuaATC component assigned to environment '@1'"
+msgstr ""
+
+#: advtrains_luaautomation/active_common.lua:96
+msgid "LuaATC component assigned to an invalid environment"
+msgstr ""
+
+#: advtrains_luaautomation/active_common.lua:171
+msgid "LuaATC component with error: @1"
+msgstr ""
+
+#: advtrains_luaautomation/init.lua:13
+msgid ""
+"Can place and configure LuaATC components, including execute potentially "
+"harmful Lua code"
+msgstr ""
+
+#: advtrains_luaautomation/mesecon_controller.lua:211
+msgid "LuaATC Mesecon Controller"
+msgstr ""
+
+#: advtrains_luaautomation/operation_panel.lua:11
+msgid "LuaATC Operation Panel"
+msgstr ""
+
+#: advtrains_luaautomation/pcnaming.lua:28
+msgid ""
+"Passive Component Naming Tool\n"
+"\n"
+"Right-click to name a passive component."
+msgstr ""
+"被动元件命名工具\n"
+"\n"
+"右键单击命名所选元件。"
+
+#: advtrains_luaautomation/pcnaming.lua:39
+msgid ""
+"You are not allowed to name LuaATC passive components without the @1 "
+"privilege."
+msgstr "您没有“@1”权限，不能命名被动元件。"
+
+#: advtrains_luaautomation/pcnaming.lua:62
+msgid "Set name of component (empty to clear)"
+msgstr ""
+
+#: advtrains_train_industrial/init.lua:10
+#: advtrains_train_industrial/init.lua:49 advtrains_train_steam/init.lua:20
+#: advtrains_train_steam/init.lua:91
+msgid "Driver Stand (right)"
+msgstr "右侧司机座位"
+
+#: advtrains_train_industrial/init.lua:17
+#: advtrains_train_industrial/init.lua:56 advtrains_train_steam/init.lua:14
+#: advtrains_train_steam/init.lua:85
+msgid "Driver Stand (left)"
+msgstr "左侧司机座位"
+
+#: advtrains_train_industrial/init.lua:40
+msgid "Industrial Train Engine"
+msgstr "工业用火车头"
+
+#: advtrains_train_industrial/init.lua:79
+msgid "Big Industrial Train Engine"
+msgstr "大型工业用火车头"
+
+#: advtrains_train_industrial/init.lua:98
+msgid "Industrial tank wagon"
+msgstr "液体运输车厢"
+
+#: advtrains_train_industrial/init.lua:116
+msgid "Industrial wood wagon"
+msgstr "木材运输车厢"
+
+#: advtrains_train_japan/init.lua:4
+msgid "Japanese Train Inter-Wagon Connection"
+msgstr "日本火车车钩"
+
+#: advtrains_train_japan/init.lua:37
+msgid "Driver stand"
+msgstr "司机座位"
+
+#: advtrains_train_japan/init.lua:101
+msgid "Japanese Train Engine"
+msgstr "高速列车车头"
+
+#: advtrains_train_japan/init.lua:176
+msgid "Japanese Train Wagon"
+msgstr "高速列车车厢"
+
+#: advtrains_train_steam/init.lua:75
+msgid "Steam Engine"
+msgstr "蒸汽机车"
+
+#: advtrains_train_steam/init.lua:159
+msgid "Detailed Steam Engine"
+msgstr "精细的蒸汽机车"
+
+#: advtrains_train_steam/init.lua:206
+msgid "Passenger Wagon"
+msgstr "客车"
+
+#: advtrains_train_steam/init.lua:226
+msgid "Box Wagon"
+msgstr "货运车厢"
+
+#: advtrains_train_subway/init.lua:144
+msgid "Subway Passenger Wagon"
+msgstr "地铁车厢"
+
+#: advtrains_train_track/init.lua:31
+msgid "Y-turnout"
+msgstr "对称道岔"
+
+#: advtrains_train_track/init.lua:49
+msgid "3-way turnout"
+msgstr "三开道岔"
+
+#: advtrains_train_track/init.lua:69
+msgid "Perpendicular Diamond Crossing Track"
+msgstr "垂直交叉轨道"
+
+#: advtrains_train_track/init.lua:91
+msgid "90+Angle Diamond Crossing Track"
+msgstr "交叉轨道 (其中一条轨道与坐标轴平行)"
+
+#: advtrains_train_track/init.lua:132
+msgid "Diagonal Diamond Crossing Track"
+msgstr "交叉轨道"
+
+#: advtrains_train_track/init.lua:179
+msgid "Bumper"
+msgstr "保险杠"
+
+#: advtrains_train_track/init.lua:201
+msgid "ATC controller"
+msgstr "ATC 控制器"
+
+#: advtrains_train_track/init.lua:317
+msgid "Unloading Track"
+msgstr "卸货轨道"
+
+#: advtrains_train_track/init.lua:342
+msgid "Loading Track"
+msgstr "装货轨道"
+
+#: advtrains_train_track/init.lua:406
+msgid "Detector Rail"
+msgstr "探测轨道"
+
+#~ msgid ""
+#~ "ATC controller, mode @1\n"
+#~ "Channel: @2"
+#~ msgstr ""
+#~ "ATC 控制器\n"
+#~ "模式：@1\n"
+#~ "频道：@2"
+
+#~ msgid "Access to @1"
+#~ msgstr "可前往@1"
+
+#~ msgid "Can't get on: wagon full or doors closed!"
+#~ msgstr "无法上车：车门已关闭或车厢已满。"
+
+#~ msgid "Can't place: protected position!"
+#~ msgstr "无法放置：此区域已被保护。"
+
+#~ msgid "Default Seat"
+#~ msgstr "默认座位"
+
+#~ msgid "Default Seat (driver stand)"
+#~ msgstr "默认座位 (司机座位)"
+
+#~ msgid "Deprecated Track"
+#~ msgstr "请不要使用"
+
+#~ msgid "Lock couples"
+#~ msgstr "锁定连接处"
+
+#~ msgid "Speed:"
+#~ msgstr "速度"
+
+#~ msgid "Target:"
+#~ msgstr "目标速度"
+
+#, fuzzy
+#~ msgid "This node can't be rotated using the trackworker,"
+#~ msgstr "您不能使用铁路调整工具旋转这个方块。"
+
+#~ msgid "This position is protected!"
+#~ msgstr "这里已被保护。"
+
+#~ msgid "Use Sneak+rightclick to bypass closed doors!"
+#~ msgstr "请使用潜行+右键上车。"
+
+#, fuzzy
+#~ msgid "You are not allowed to modify this protected track."
+#~ msgstr "这里已被保护，您不能在这里建造铁路。"
+
+#~ msgid ""
+#~ "You need to own at least one neighboring wagon to destroy this couple."
+#~ msgstr "您必须至少拥有其中一节车厢才能分开这两节车厢。"
diff --git a/advtrains/po/zh_TW.po b/advtrains/po/zh_TW.po
new file mode 100644
index 0000000..ece82c3
--- /dev/null
+++ b/advtrains/po/zh_TW.po
@@ -0,0 +1,696 @@
+msgid ""
+msgstr ""
+"Project-Id-Version: advtrains\n"
+"Report-Msgid-Bugs-To: advtrains-discuss@lists.sr.ht\n"
+"POT-Creation-Date: 2023-10-09 11:02+0200\n"
+"PO-Revision-Date: 2023-10-09 11:31+0200\n"
+"Last-Translator: Y. Wang <yw05@forksworld.de>\n"
+"Language-Team: Chinese (Traditional)\n"
+"Language: zh_TW\n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+"X-Generator: Poedit 3.3.2\n"
+
+#: advtrains/atc.lua:109
+msgid "Unconfigured ATC controller"
+msgstr "ATC 控制器 (未配置)"
+
+#: advtrains/atc.lua:150
+msgid ""
+"ATC controller, mode @1\n"
+"Command: @2"
+msgstr ""
+"ATC 控制器\n"
+"模式：@1\n"
+"命令：@2"
+
+#: advtrains/atc.lua:180
+msgid "Command"
+msgstr "命令"
+
+#: advtrains/atc.lua:184
+msgid "Command (on)"
+msgstr "命令 (啟用時)"
+
+#: advtrains/atc.lua:187
+msgid "Digiline channel"
+msgstr "Digiline 頻道"
+
+#: advtrains/atc.lua:189 advtrains_line_automation/stoprail.lua:65
+#: advtrains_luaautomation/active_common.lua:48
+msgid "Save"
+msgstr "儲存"
+
+#: advtrains/atc.lua:236
+msgid "ATC Reverse command warning: didn't reverse train, train moving."
+msgstr "ATC 警告：火車正在移動，無法改變行車方向。"
+
+#: advtrains/atc.lua:248
+msgid "ATC Kick command warning: doors are closed."
+msgstr "ATC 警告：車門已關閉，無法踢出乘客。"
+
+#: advtrains/atc.lua:252
+msgid "ATC Kick command warning: train moving."
+msgstr "ATC 警告：火車正在移動，無法踢出乘客。"
+
+#: advtrains/atc.lua:322
+msgid "ATC command syntax error: I statement not closed: @1"
+msgstr "ATC 語法錯誤：「I」命令不完整：@1"
+
+#: advtrains/atc.lua:385
+msgid "ATC command parse error: Unknown command: @1"
+msgstr "ATC 語法錯誤：未知命令：@1"
+
+#: advtrains/copytool.lua:8
+msgid ""
+"Train copy/paste tool\n"
+"\n"
+"Left-click: copy train\n"
+"Right-click: paste train"
+msgstr ""
+"火車複製工具\n"
+"\n"
+"左鍵單擊：複製\n"
+"右鍵單擊：粘帖"
+
+#: advtrains/copytool.lua:29
+msgid "You do not have the @1 privilege."
+msgstr "您沒有「@1」許可權。"
+
+#: advtrains/copytool.lua:41
+msgid "The track you are trying to place the wagon on is not long enough."
+msgstr "軌道太短。"
+
+#: advtrains/copytool.lua:47
+msgid "The clipboard couldn't access the metadata. Paste failed."
+msgstr "無法貼上：剪貼簿無法訪問元資料。"
+
+#: advtrains/copytool.lua:52 advtrains/copytool.lua:57
+msgid "The clipboard is empty."
+msgstr "剪貼簿是空的。"
+
+#: advtrains/copytool.lua:74
+msgid "Back of train would end up off track, cancelling."
+msgstr "火車後部不在軌道上。"
+
+#: advtrains/copytool.lua:92
+msgid "No such lua entity."
+msgstr "您沒有指向一個可以用火車複製工具複製的物體。"
+
+#: advtrains/copytool.lua:98
+msgid "No such wagon: @1."
+msgstr "ID 為「@1」的車廂不存在。"
+
+#: advtrains/copytool.lua:104
+msgid "No such train: @1."
+msgstr "ID 為「@1」的列車不存在。"
+
+#: advtrains/copytool.lua:176
+msgid "The clipboard couldn't access the metadata. Copy failed."
+msgstr "無法複製：剪貼簿無法訪問元資料。"
+
+#: advtrains/copytool.lua:180
+msgid "Train copied."
+msgstr "已複製火車。"
+
+#: advtrains/couple.lua:28
+msgid "Buffer and Chain Coupler"
+msgstr "鏈式連結器"
+
+#: advtrains/couple.lua:29
+msgid "Scharfenberg Coupler"
+msgstr "Scharfenberg 式連結器"
+
+#: advtrains/couple.lua:185
+msgid ""
+"You are not allowed to couple trains without the train_operator privilege."
+msgstr "您沒有「train_operator」許可權，不能連結這兩節車廂。"
+
+#: advtrains/couple.lua:329 advtrains/couple.lua:333
+msgid "<No coupler>"
+msgstr "<無連結器>"
+
+#: advtrains/couple.lua:334
+msgid "Can not couple: The couplers of the trains do not match (@1 and @2)."
+msgstr "您無法連結這兩節車廂：這兩節車廂使用不同的連結器 (@1和@2)。"
+
+#: advtrains/craft_items.lua:3
+msgid "Boiler"
+msgstr "鍋爐"
+
+#: advtrains/craft_items.lua:9
+msgid "Driver's cab"
+msgstr "駕駛室"
+
+#: advtrains/craft_items.lua:15
+msgid "Wheel"
+msgstr "車輪"
+
+#: advtrains/craft_items.lua:21
+msgid "Chimney"
+msgstr "煙囪"
+
+#: advtrains/misc_nodes.lua:16
+msgid "@1 Platform (low)"
+msgstr "較低的@1月臺"
+
+#: advtrains/misc_nodes.lua:33
+msgid "@1 Platform (high)"
+msgstr "較高的@1月臺"
+
+#: advtrains/misc_nodes.lua:59
+msgid "@1 Platform (45 degree)"
+msgstr "較高的@1月臺 (45°)"
+
+#: advtrains/misc_nodes.lua:81
+msgid "@1 Platform (low, 45 degree)"
+msgstr "較低的@1月臺 (45°)"
+
+#: advtrains/protection.lua:7
+msgid "Can place, remove and operate trains"
+msgstr ""
+
+#: advtrains/protection.lua:12
+msgid ""
+"Can place, remove and operate any train, regardless of owner, whitelist, or "
+"protection"
+msgstr ""
+
+#: advtrains/protection.lua:18
+msgid "Can place and dig tracks in unprotected areas"
+msgstr ""
+
+#: advtrains/protection.lua:24
+msgid "Can operate turnouts and signals in unprotected areas"
+msgstr ""
+
+#: advtrains/protection.lua:148
+msgid ""
+"You are not allowed to build near tracks without the track_builder privilege."
+msgstr "您沒有「train_operator」許可權，不能在鐵路附近建任何東西。"
+
+#: advtrains/protection.lua:148
+msgid ""
+"You are not allowed to build tracks without the track_builder privilege."
+msgstr "您沒有「train_operator」許可權，不能在這裡建造鐵路。"
+
+#: advtrains/protection.lua:153
+msgid "You are not allowed to build near tracks at this protected position."
+msgstr "這裡已被保護，您不能在這裡的鐵路附近建任何東西。"
+
+#: advtrains/protection.lua:153
+msgid "You are not allowed to build tracks at this protected position."
+msgstr "這裡已被保護，您不能在這裡建造鐵路。"
+
+#: advtrains/protection.lua:184
+msgid ""
+"You are not allowed to operate turnouts and signals without the "
+"railway_operator privilege."
+msgstr "您沒有「railway_operator」許可權，不能控制鐵路設施。"
+
+#: advtrains/signals.lua:63
+msgid "Lampless Signal"
+msgstr "臂木式號誌機"
+
+#: advtrains/signals.lua:127
+msgid "Signal"
+msgstr "色燈號誌機"
+
+#: advtrains/signals.lua:191
+msgid "Wallmounted Signal (left)"
+msgstr "壁掛式色燈號誌機 (左側)"
+
+#: advtrains/signals.lua:192
+msgid "Wallmounted Signal (right)"
+msgstr "壁掛式色燈號誌機 (右側)"
+
+#: advtrains/signals.lua:193
+msgid "Wallmounted Signal (top)"
+msgstr "懸掛式色燈號誌機"
+
+#: advtrains/signals.lua:281 advtrains/signals.lua:322
+msgid "Andrew's Cross"
+msgstr "平交道號誌燈"
+
+#: advtrains/trackplacer.lua:313
+msgid ""
+"Track Worker Tool\n"
+"\n"
+"Left-click: change rail type (straight/curve/switch)\n"
+"Right-click: rotate object"
+msgstr ""
+"鐵路調整工具\n"
+"\n"
+"左鍵單擊：切換軌道型別\n"
+"右鍵單擊：旋轉方塊"
+
+#: advtrains/trackplacer.lua:340 advtrains/trackplacer.lua:377
+msgid "This node can't be rotated using the trackworker."
+msgstr "您不能使用鐵路調整工具旋轉這個方塊。"
+
+#: advtrains/trackplacer.lua:350
+msgid "This track can not be rotated."
+msgstr "您不能旋轉這段軌道。"
+
+#: advtrains/trackplacer.lua:404
+msgid "This node can't be changed using the trackworker."
+msgstr "您不能使用鐵路調整工具調整這個方塊。"
+
+#: advtrains/trackplacer.lua:414
+msgid "This track can not be changed."
+msgstr "您不能調整這段軌道。"
+
+#: advtrains/tracks.lua:449
+msgid "This track can not be removed."
+msgstr "您不能移除這段軌道。"
+
+#: advtrains/tracks.lua:616
+msgid "Position is occupied by a train."
+msgstr ""
+
+#: advtrains/tracks.lua:622
+msgid "There's a Track Circuit Break here."
+msgstr ""
+
+#: advtrains/tracks.lua:626
+msgid "There's a Signal Influence Point here."
+msgstr ""
+
+#: advtrains/tracks.lua:637
+msgid "@1 Slope"
+msgstr "@1斜坡"
+
+#: advtrains/tracks.lua:648 advtrains/tracks.lua:653
+msgid "Can't place slope: not pointing at node."
+msgstr "無法放置斜坡：您沒有選擇任何方塊。"
+
+#: advtrains/tracks.lua:658
+msgid "Can't place slope: space occupied."
+msgstr "無法放置斜坡：此區域已被佔用。"
+
+#: advtrains/tracks.lua:711
+msgid "Can't place slope: Not enough slope items left (@1 required)."
+msgstr "無法放置斜坡：您沒有足夠的鐵路斜坡放置工具 (您總共需要@1個)"
+
+#: advtrains/tracks.lua:714
+msgid "Can't place slope: There's no slope of length @1."
+msgstr "無法放置斜坡：advtrains 不支援長度為@1米的斜坡。"
+
+#: advtrains/tracks.lua:721
+msgid "Can't place slope: no supporting node at upper end."
+msgstr "無法放置斜坡：較高階沒有支撐方塊。"
+
+#: advtrains/trainhud.lua:305
+msgid "OVERRUN RED SIGNAL! Examine situation and reverse train to move again."
+msgstr ""
+
+#: advtrains/wagons.lua:179
+msgid "This wagon is owned by @1, you can't destroy it."
+msgstr "這是 @1 的車廂，您不能摧毀它。"
+
+#: advtrains/wagons.lua:203
+msgid "The wagon's inventory is not empty."
+msgstr ""
+
+#: advtrains/wagons.lua:210
+msgid "Wagon needs to be decoupled from other wagons in order to destroy it."
+msgstr ""
+
+#: advtrains/wagons.lua:216
+msgid ""
+"Warning: If you destroy this wagon, you only get some steel back! If you are "
+"sure, hold Sneak and left-click the wagon."
+msgstr ""
+"警告：如果您摧毀此車廂，您只能拿到一些鋼方塊。如果您確定要摧毀這節車廂，請按"
+"潛行鍵並左鍵單擊此車廂。"
+
+#: advtrains/wagons.lua:649 advtrains/wagons.lua:850
+msgid "Show Inventory"
+msgstr "顯示物品欄"
+
+#: advtrains/wagons.lua:652
+msgid "Onboard Computer"
+msgstr ""
+
+#: advtrains/wagons.lua:655 advtrains/wagons.lua:1328
+msgid "Wagon properties"
+msgstr "車廂屬性"
+
+#: advtrains/wagons.lua:658
+msgid "Get off"
+msgstr "下車"
+
+#: advtrains/wagons.lua:661
+msgid "Get off (forced)"
+msgstr "強制下車"
+
+#: advtrains/wagons.lua:663
+msgid "(Doors closed)"
+msgstr "(車門已關閉)"
+
+#: advtrains/wagons.lua:692
+msgid "This wagon has no seats."
+msgstr "這節車廂沒有座位。"
+
+#: advtrains/wagons.lua:703
+msgid "This wagon is full."
+msgstr "車廂已滿。"
+
+#: advtrains/wagons.lua:706
+msgid "Doors are closed! (Try holding sneak key!)"
+msgstr ""
+
+#: advtrains/wagons.lua:712
+msgid "You can't get on this wagon."
+msgstr ""
+
+#: advtrains/wagons.lua:838
+msgid "Select seat:"
+msgstr "請選擇座位："
+
+#: advtrains/wagons.lua:880
+msgid "Save wagon properties"
+msgstr "儲存車廂屬性"
+
+#: advtrains/wagons.lua:965
+msgid "Text displayed outside on train"
+msgstr "車廂外部顯示"
+
+#: advtrains/wagons.lua:966
+msgid "Text displayed inside train"
+msgstr "車廂內部顯示"
+
+#: advtrains/wagons.lua:967
+msgid "Line"
+msgstr "火車線路"
+
+#: advtrains/wagons.lua:968
+msgid "Routingcode"
+msgstr "路由碼"
+
+#: advtrains/wagons.lua:1241
+msgid ""
+"Doors are closed. Use Sneak+rightclick to ignore the closed doors and get "
+"off."
+msgstr "車門已關閉，請使用潛行+右鍵單擊下車。"
+
+#: advtrains/wagons.lua:1250
+msgid "You are not allowed to access the driver stand."
+msgstr ""
+
+#: advtrains_interlocking/tsr_rail.lua:13
+msgid "Point speed restriction: @1"
+msgstr ""
+
+#: advtrains_interlocking/tsr_rail.lua:14
+msgid "Set point speed restriction:"
+msgstr ""
+
+#: advtrains_interlocking/tsr_rail.lua:30
+msgid "You are not allowed to configure this track without the @1 privilege."
+msgstr "您沒有「@1」許可權，不能調整這段軌道。"
+
+#: advtrains_interlocking/tsr_rail.lua:34
+#: advtrains_line_automation/stoprail.lua:31
+#: advtrains_line_automation/stoprail.lua:76
+msgid "You are not allowed to configure this track."
+msgstr "您不能調整這段軌道。"
+
+#: advtrains_interlocking/tsr_rail.lua:64
+msgid "Point Speed Restriction Track"
+msgstr ""
+
+#: advtrains_line_automation/stoprail.lua:54
+msgid "Station Code"
+msgstr "車站碼"
+
+#: advtrains_line_automation/stoprail.lua:55
+msgid "Station Name"
+msgstr "車站名稱"
+
+#: advtrains_line_automation/stoprail.lua:56
+msgid "Door Delay"
+msgstr "車門關閉時間"
+
+#: advtrains_line_automation/stoprail.lua:57
+msgid "Dep. Speed"
+msgstr "出發速度"
+
+#: advtrains_line_automation/stoprail.lua:58 advtrains_train_track/init.lua:11
+#: advtrains_train_track/init.lua:156
+msgid "Track"
+msgstr "軌道"
+
+#: advtrains_line_automation/stoprail.lua:59
+msgid "Stop Time"
+msgstr "停站時間"
+
+#: advtrains_line_automation/stoprail.lua:60
+msgid "Door Side"
+msgstr ""
+
+#: advtrains_line_automation/stoprail.lua:62
+msgid "Reverse train"
+msgstr "改變行車方向"
+
+#: advtrains_line_automation/stoprail.lua:63
+msgid "Kick out passengers"
+msgstr "踢出乘客"
+
+#: advtrains_line_automation/stoprail.lua:97
+msgid "Station code \"@1\" already exists and is owned by @2."
+msgstr ""
+
+#: advtrains_line_automation/stoprail.lua:111
+msgid "This station is owned by @1. You are not allowed to edit its name."
+msgstr ""
+
+#: advtrains_line_automation/stoprail.lua:221
+msgid "Station/Stop Track"
+msgstr "車站軌道"
+
+#: advtrains_luaautomation/active_common.lua:17
+msgid "Unconfigured LuaATC component"
+msgstr "LuaATC 元件 (未配置)"
+
+#: advtrains_luaautomation/active_common.lua:46
+msgid "LuaATC Environment"
+msgstr ""
+
+#: advtrains_luaautomation/active_common.lua:49
+msgid "Clear Local Environment"
+msgstr ""
+
+#: advtrains_luaautomation/active_common.lua:50
+msgid "Code"
+msgstr ""
+
+#: advtrains_luaautomation/active_common.lua:64
+msgid ""
+"You are not allowed to configure this LuaATC component without the @1 "
+"privilege."
+msgstr "您沒有「@1」許可權，不能配置這個 LuaATC 元件。"
+
+#: advtrains_luaautomation/active_common.lua:94
+msgid "LuaATC component assigned to environment '@1'"
+msgstr ""
+
+#: advtrains_luaautomation/active_common.lua:96
+msgid "LuaATC component assigned to an invalid environment"
+msgstr ""
+
+#: advtrains_luaautomation/active_common.lua:171
+msgid "LuaATC component with error: @1"
+msgstr ""
+
+#: advtrains_luaautomation/init.lua:13
+msgid ""
+"Can place and configure LuaATC components, including execute potentially "
+"harmful Lua code"
+msgstr ""
+
+#: advtrains_luaautomation/mesecon_controller.lua:211
+msgid "LuaATC Mesecon Controller"
+msgstr ""
+
+#: advtrains_luaautomation/operation_panel.lua:11
+msgid "LuaATC Operation Panel"
+msgstr ""
+
+#: advtrains_luaautomation/pcnaming.lua:28
+msgid ""
+"Passive Component Naming Tool\n"
+"\n"
+"Right-click to name a passive component."
+msgstr ""
+"被動元件命名工具\n"
+"\n"
+"右鍵單擊命名所選元件。"
+
+#: advtrains_luaautomation/pcnaming.lua:39
+msgid ""
+"You are not allowed to name LuaATC passive components without the @1 "
+"privilege."
+msgstr "您沒有「@1」許可權，不能命名這個元件。"
+
+#: advtrains_luaautomation/pcnaming.lua:62
+msgid "Set name of component (empty to clear)"
+msgstr ""
+
+#: advtrains_train_industrial/init.lua:10
+#: advtrains_train_industrial/init.lua:49 advtrains_train_steam/init.lua:20
+#: advtrains_train_steam/init.lua:91
+msgid "Driver Stand (right)"
+msgstr "右側司機座位"
+
+#: advtrains_train_industrial/init.lua:17
+#: advtrains_train_industrial/init.lua:56 advtrains_train_steam/init.lua:14
+#: advtrains_train_steam/init.lua:85
+msgid "Driver Stand (left)"
+msgstr "左側司機座位"
+
+#: advtrains_train_industrial/init.lua:40
+msgid "Industrial Train Engine"
+msgstr "工業用火車頭"
+
+#: advtrains_train_industrial/init.lua:79
+msgid "Big Industrial Train Engine"
+msgstr "大型工業用火車頭"
+
+#: advtrains_train_industrial/init.lua:98
+msgid "Industrial tank wagon"
+msgstr "液體運輸車廂"
+
+#: advtrains_train_industrial/init.lua:116
+msgid "Industrial wood wagon"
+msgstr "木材運輸車廂"
+
+#: advtrains_train_japan/init.lua:4
+msgid "Japanese Train Inter-Wagon Connection"
+msgstr "日本火車連結器"
+
+#: advtrains_train_japan/init.lua:37
+msgid "Driver stand"
+msgstr "司機座位"
+
+#: advtrains_train_japan/init.lua:101
+msgid "Japanese Train Engine"
+msgstr "高速列車車頭"
+
+#: advtrains_train_japan/init.lua:176
+msgid "Japanese Train Wagon"
+msgstr "高速列車車廂"
+
+#: advtrains_train_steam/init.lua:75
+msgid "Steam Engine"
+msgstr "蒸汽機車"
+
+#: advtrains_train_steam/init.lua:159
+msgid "Detailed Steam Engine"
+msgstr "精細的蒸汽機車"
+
+#: advtrains_train_steam/init.lua:206
+msgid "Passenger Wagon"
+msgstr "客車"
+
+#: advtrains_train_steam/init.lua:226
+msgid "Box Wagon"
+msgstr "貨運車廂"
+
+#: advtrains_train_subway/init.lua:144
+msgid "Subway Passenger Wagon"
+msgstr "地鐵車廂"
+
+#: advtrains_train_track/init.lua:31
+msgid "Y-turnout"
+msgstr "對稱道岔"
+
+#: advtrains_train_track/init.lua:49
+msgid "3-way turnout"
+msgstr "三開道岔"
+
+#: advtrains_train_track/init.lua:69
+msgid "Perpendicular Diamond Crossing Track"
+msgstr "垂直交叉軌道"
+
+#: advtrains_train_track/init.lua:91
+msgid "90+Angle Diamond Crossing Track"
+msgstr "交叉軌道 (其中一條軌道與座標軸平行)"
+
+#: advtrains_train_track/init.lua:132
+msgid "Diagonal Diamond Crossing Track"
+msgstr "交叉軌道"
+
+#: advtrains_train_track/init.lua:179
+msgid "Bumper"
+msgstr "保險槓"
+
+#: advtrains_train_track/init.lua:201
+msgid "ATC controller"
+msgstr "ATC 控制器"
+
+#: advtrains_train_track/init.lua:317
+msgid "Unloading Track"
+msgstr "卸貨軌道"
+
+#: advtrains_train_track/init.lua:342
+msgid "Loading Track"
+msgstr "裝貨軌道"
+
+#: advtrains_train_track/init.lua:406
+msgid "Detector Rail"
+msgstr "探測軌道"
+
+#~ msgid ""
+#~ "ATC controller, mode @1\n"
+#~ "Channel: @2"
+#~ msgstr ""
+#~ "ATC 控制器\n"
+#~ "模式：@1\n"
+#~ "頻道：@2"
+
+#~ msgid "Access to @1"
+#~ msgstr "可前往@1"
+
+#~ msgid "Can't get on: wagon full or doors closed!"
+#~ msgstr "無法上車：車門已關閉或車廂已滿。"
+
+#~ msgid "Can't place: protected position!"
+#~ msgstr "無法放置：此區域已被保護。"
+
+#~ msgid "Default Seat"
+#~ msgstr "預設座位"
+
+#~ msgid "Default Seat (driver stand)"
+#~ msgstr "預設座位 (司機座位)"
+
+#~ msgid "Deprecated Track"
+#~ msgstr "請不要使用"
+
+#~ msgid "Lock couples"
+#~ msgstr "鎖定連結處"
+
+#~ msgid "Speed:"
+#~ msgstr "速度"
+
+#~ msgid "Target:"
+#~ msgstr "目標速度"
+
+#, fuzzy
+#~ msgid "This node can't be rotated using the trackworker,"
+#~ msgstr "您不能使用鐵路調整工具旋轉這個方塊。"
+
+#~ msgid "This position is protected!"
+#~ msgstr "這裡已被保護。"
+
+#~ msgid "Use Sneak+rightclick to bypass closed doors!"
+#~ msgstr "請使用潛行+右鍵上車。"
+
+#, fuzzy
+#~ msgid "You are not allowed to modify this protected track."
+#~ msgstr "這裡已被保護，您不能在這裡建造鐵路。"
+
+#~ msgid ""
+#~ "You need to own at least one neighboring wagon to destroy this couple."
+#~ msgstr "您必須至少擁有其中一節車廂才能分開這兩節車廂。"
diff --git a/advtrains/poconvert.lua b/advtrains/poconvert.lua
new file mode 100644
index 0000000..74f962e
--- /dev/null
+++ b/advtrains/poconvert.lua
@@ -0,0 +1,185 @@
+local unescape_string
+do
+	local schartbl = { -- https://en.wikipedia.org/wiki/Escape_sequences_in_C
+		a = "\a",
+		b = "\b",
+		e = string.char(0x1b),
+		f = "\f",
+		n = "\n",
+		r = "\r",
+		t = "\t",
+		v = "\v",
+	}
+	local function replace_single(pfx, c)
+		local pl = #pfx
+		if pl % 2 == 0 then
+			return string.sub(pfx, 1, pl/2) .. c
+		end
+		return string.sub(pfx, 1, math.floor(pl/2)) .. (schartbl[c] or c)
+	end
+	unescape_string = function(str)
+		return string.gsub(str, [[(\+)([abefnrtv'"?])]], replace_single)
+	end
+end
+
+local function readstring_aux(str, pos)
+	local _, spos = string.find(str, [[^%s*"]], pos)
+	if not spos then
+		return nil
+	end
+	local ipos = spos
+	while true do
+		local _, epos, m = string.find(str, [[(\*)"]], ipos+1)
+		if not epos then
+			return error("String extends beyond the end of input")
+		end
+		ipos = epos
+		if #m % 2 == 0 then
+			return unescape_string(string.sub(str, spos+1, epos-1)), epos+1
+		end
+	end
+end
+
+local function readstring(str, pos)
+	local st = {}
+	local nxt = pos
+	while true do
+		local s, npos = readstring_aux(str, nxt)
+		if not s then
+			if not st[1] then
+				return nil, nxt
+			else
+				return table.concat(st), nxt
+			end
+		end
+		nxt = npos
+		table.insert(st, s)
+	end
+end
+
+local function readtoken(str, pos)
+	local _, epos, tok = string.find(str, [[^%s*(%S+)]], pos)
+	if epos == nil then
+		return nil, pos
+	end
+	return tok, epos+1
+end
+
+local function readcomment_add_flags(flags, s)
+	for flag in string.gmatch(s, ",%s*([^,]+)") do
+		flags[flag] = true
+	end
+end
+
+local function readcomment_aux(str, pos)
+	local _, epos, sval = string.find(str, "^\n*#([^\n]*)", pos)
+	if not epos then
+		return nil
+	end
+	return sval, epos+1
+end
+
+local function readcomment(str, pos)
+	local st = {}
+	local nxt = pos
+	local flags = {}
+	while true do
+		local s, npos = readcomment_aux(str, nxt)
+		if not npos then
+			local t = {
+				comment = table.concat(st, "\n"),
+				flags = flags,
+			}
+			return t, nxt
+		end
+		if string.sub(s, 1, 1) == "," then
+			readcomment_add_flags(flags, s)
+		end
+		table.insert(st, s)
+		nxt = npos
+	end
+end
+
+local function readpo(str)
+	local st = {}
+	local pos = 1
+	while true do
+		local entry, nxt = readcomment(str, pos)
+		local msglines = 0
+		while true do
+			local tok, npos = readtoken(str, nxt)
+			if tok == nil or string.sub(tok, 1, 1) == "#" then
+				break
+			elseif string.sub(tok, 1, 3) ~= "msg" then
+				return error("Invalid token: " .. tok)
+			elseif entry[tok] ~= nil then
+				break
+			else
+				local value, npos = readstring(str, npos)
+				assert(value ~= nil, "No string provided for " .. tok)
+				entry[tok] = value
+				nxt = npos
+				msglines = msglines+1
+			end
+		end
+		if msglines == 0 then
+			return st
+		elseif entry.msgid ~= "" then
+			assert(entry.msgid ~= nil, "Missing untranslated string")
+			assert(entry.msgstr ~= nil, "Missing translated string")
+			table.insert(st, entry)
+		end
+		pos = nxt
+	end
+end
+
+local escape_lookup = {
+	["="] = "@=",
+	["\n"] = "@n"
+}
+local function escape_string(st)
+	return (string.gsub(st, "[=\n]", escape_lookup))
+end
+
+local function convert_po_string(textdomain, str)
+	local st = {string.format("# textdomain: %s", textdomain)}
+	for _, entry in ipairs(readpo(str)) do
+		local line = ("%s=%s"):format(escape_string(entry.msgid), escape_string(entry.msgstr))
+		if entry.flags.fuzzy then
+			line = "#" .. line
+		end
+		table.insert(st, line)
+	end
+	return table.concat(st, "\n")
+end
+
+local function convert_po_file(textdomain, inpath, outpath)
+	local f, err = io.open(inpath, "rb")
+	assert(f, err)
+	local str = convert_po_string(textdomain, f:read("*a"))
+	f:close()
+	minetest.safe_file_write(outpath, str)
+	return str
+end
+
+local function convert_flat_po_directory(textdomain, modpath)
+	assert(textdomain, "No textdomain specified for po file conversion")
+	local mp = modpath or minetest.get_modpath(textdomain)
+	assert(mp ~= nil, "No path to write for " .. textdomain)
+	local popath = mp .. "/po"
+	local trpath = mp .. "/locale"
+	for _, infile in pairs(minetest.get_dir_list(popath, false)) do
+		local lang = string.match(infile, [[^([^%.]+)%.po$]])
+		if lang then
+			local inpath = popath .. "/" .. infile
+			local outpath = ("%s/%s.%s.tr"):format(trpath, textdomain, lang)
+			convert_po_file(textdomain, inpath, outpath)
+		end
+	end
+end
+
+return {
+	from_string = convert_po_string,
+	from_file = convert_po_file,
+	from_flat = convert_flat_po_directory,
+}
diff --git a/advtrains/protection.lua b/advtrains/protection.lua
index 7c5cf0b..36f4192 100644
--- a/advtrains/protection.lua
+++ b/advtrains/protection.lua
@@ -4,24 +4,24 @@
 
 -- Privileges to control TRAIN DRIVING/COUPLING
 minetest.register_privilege("train_operator", {
-	description = "Without this privilege, a player can't do anything about trains, neither place or remove them nor drive or couple them (but he can build tracks if he has track_builder)",
+	description = attrans("Can place, remove and operate trains"),
 	give_to_singleplayer= true,
 });
 
 minetest.register_privilege("train_admin", {
-	description = "Player may drive, place or remove any trains from/to anywhere, regardless of owner, whitelist or protection",
+	description = attrans("Can place, remove and operate any train, regardless of owner, whitelist, or protection"),
 	give_to_singleplayer= true,
 });
 
 -- Privileges to control TRACK BUILDING
 minetest.register_privilege("track_builder", {
-	description = "Player can place and/or dig rails not protected from him. If he also has protection_bypass, he can place/dig any rails",
+	description = attrans("Can place and dig tracks in unprotected areas"),
 	give_to_singleplayer= true,
 });
 
 -- Privileges to control OPERATING TURNOUTS/SIGNALS
 minetest.register_privilege("railway_operator", {
-	description = "Player can operate turnouts and signals not protected from him. If he also has protection_bypass, he can operate any turnouts/signals",
+	description = attrans("Can operate turnouts and signals in unprotected areas"),
 	give_to_singleplayer= true,
 });
 
diff --git a/advtrains/settingtypes.txt b/advtrains/settingtypes.txt
index 2b627cb..a09da71 100644
--- a/advtrains/settingtypes.txt
+++ b/advtrains/settingtypes.txt
@@ -7,6 +7,10 @@ advtrains_show_ids (Show ID's in infotext) bool false
 #    You probably want to leave this setting set to false.
 advtrains_enable_debugging (Enable debugging) bool false
 
+#    Register certain debug items, for example the tunnelborer
+#    Do not use on productive servers!
+advtrains_register_debugitems (Register Debug Items) bool false
+
 #    Enable the logging of certain events related to advtrains
 #    Logs are saved in the world directory as advtrains.log
 #    This setting is useful for multiplayer servers
@@ -61,3 +65,6 @@ advtrains_save_interval (Save Interval) int 60 20 3600
 #    If enabled, trains only collide with nodes with "normal" drawtype.
 advtrains_forgiving_collision (Forgiving Collision mode) bool false
 
+#    Enable universal couplers for wagons
+#    If enabled, wagons will bypass the checks that compare the coupler types when coupling.
+advtrains_universal_couplers (Universal Couplers) bool false
\ No newline at end of file
diff --git a/advtrains/signals.lua b/advtrains/signals.lua
index d533227..93fd99e 100644
--- a/advtrains/signals.lua
+++ b/advtrains/signals.lua
@@ -3,15 +3,15 @@
 
 local mrules_wallsignal = advtrains.meseconrules
 
-local function can_dig_func(pos)
+local function can_dig_func(pos, player)
 	if advtrains.interlocking then
-		return advtrains.interlocking.signal_can_dig(pos)
+		return advtrains.interlocking.signal.can_dig(pos, player)
 	end
 	return true
 end
-local function after_dig_func(pos)
+local function after_dig_func(pos, oldnode, oldmetadata, digger)
 	if advtrains.interlocking then
-		return advtrains.interlocking.signal_after_dig(pos)
+		return advtrains.interlocking.signal.after_dig(pos, oldnode, oldmetadata, digger)
 	end
 	return true
 end
@@ -26,22 +26,24 @@ return {
 }
 end
 
-local suppasp = {
-		main = {0, -1},
-		dst = {false},
-		shunt = nil,
-		proceed_as_main = true,
-		info = {
-			call_on = false,
-			dead_end = false,
-			w_speed = nil,
-		}
+local main_aspects = {
+	{ name = "free", description = "Free" }
 }
 
+local function simple_apply_aspect(offname, onname)
+	return function(pos, node, main_aspect, rem_aspect, rem_aspinfo)
+		if main_aspect.halt then
+			advtrains.ndb.swap_node(pos, {name = offname, param2 = node.param2})
+		else
+			advtrains.ndb.swap_node(pos, {name = onname, param2 = node.param2})
+		end
+	end
+end
+
 for r,f in pairs({on={as="off", ls="green", als="red"}, off={as="on", ls="red", als="green"}}) do
 
-	advtrains.trackplacer.register_tracktype("advtrains:retrosignal", "")
-	advtrains.trackplacer.register_tracktype("advtrains:signal", "")
+	-- advtrains.trackplacer.register_tracktype("advtrains:retrosignal", "")
+	-- advtrains.trackplacer.register_tracktype("advtrains:signal", "")
 
 	for rotid, rotation in ipairs({"", "_30", "_45", "_60"}) do
 		local crea=1
@@ -75,7 +77,10 @@ for r,f in pairs({on={as="off", ls="green", als="red"}, off={as="on", ls="red",
 				["action_"..f.as] = function (pos, node)
 					advtrains.ndb.swap_node(pos, {name = "advtrains:retrosignal_"..f.as..rotation, param2 = node.param2}, true)
 					if advtrains.interlocking then
-						advtrains.interlocking.signal_on_aspect_changed(pos)
+						-- forcefully clears any set aspect, so that aspect system doesnt override it again
+						advtrains.interlocking.signal.unregister_aspect(pos)
+						-- notify trains
+						advtrains.interlocking.signal.notify_trains(pos)
 					end
 				end
 			}},
@@ -89,29 +94,24 @@ for r,f in pairs({on={as="off", ls="green", als="red"}, off={as="on", ls="red",
 				elseif advtrains.check_turnout_signal_protection(pos, player:get_player_name()) then
 					advtrains.ndb.swap_node(pos, {name = "advtrains:retrosignal_"..f.as..rotation, param2 = node.param2}, true)
 					if advtrains.interlocking then
-						advtrains.interlocking.signal_on_aspect_changed(pos)
+						-- forcefully clears any set aspect, so that aspect system doesnt override it again
+						advtrains.interlocking.signal.unregister_aspect(pos)
+						-- notify trains
+						advtrains.interlocking.signal.notify_trains(pos)
 					end
 				end
 			end,
-			-- new signal API
+			-- very new signal API
 			advtrains = {
-				set_aspect = function(pos, node, asp)
-					if asp.main ~= 0 then
-						advtrains.ndb.swap_node(pos, {name = "advtrains:retrosignal_on"..rotation, param2 = node.param2}, true)
-					else
-						advtrains.ndb.swap_node(pos, {name = "advtrains:retrosignal_off"..rotation, param2 = node.param2}, true)
-					end
-				end,
-				get_aspect = function(pos, node)
-					return aspect(r=="on")
-				end,
-				supported_aspects = suppasp,
+				main_aspects = main_aspects,
+				apply_aspect = simple_apply_aspect("advtrains:retrosignal_off"..rotation, "advtrains:retrosignal_on"..rotation),
+				get_aspect_info = function() return aspect(r=="on") end,
 			},
 			can_dig = can_dig_func,
 			after_dig_node = after_dig_func,
-			check_for_pole = true,
+			--TODO add rotation using trackworker
 		})
-		advtrains.trackplacer.add_worked("advtrains:retrosignal", r, rotation, nil)
+		-- advtrains.trackplacer.add_worked("advtrains:retrosignal", r, rotation, nil)
 		
 		minetest.register_node("advtrains:signal_"..r..rotation, {
 			drawtype = "mesh",
@@ -140,9 +140,6 @@ for r,f in pairs({on={as="off", ls="green", als="red"}, off={as="on", ls="red",
 				rules=advtrains.meseconrules,
 				["action_"..f.as] = function (pos, node)
 					advtrains.setstate(pos, f.als, node)
-					if advtrains.interlocking then
-						advtrains.interlocking.signal_on_aspect_changed(pos)
-					end
 				end
 			}},
 			on_rightclick=function(pos, node, player)
@@ -154,36 +151,29 @@ for r,f in pairs({on={as="off", ls="green", als="red"}, off={as="on", ls="red",
 					advtrains.interlocking.show_ip_form(pos, pname)
 				elseif advtrains.check_turnout_signal_protection(pos, player:get_player_name()) then
 					advtrains.setstate(pos, f.als, node)
-					if advtrains.interlocking then
-						advtrains.interlocking.signal_on_aspect_changed(pos)
-					end
 				end
 			end,
-			-- new signal API
+			-- very new signal API
 			advtrains = {
-				set_aspect = function(pos, node, asp)
-					if asp.main ~= 0 then
-						advtrains.ndb.swap_node(pos, {name = "advtrains:signal_on"..rotation, param2 = node.param2}, true)
-					else
-						advtrains.ndb.swap_node(pos, {name = "advtrains:signal_off"..rotation, param2 = node.param2}, true)
-					end
-				end,
-				get_aspect = function(pos, node)
-					return aspect(r=="on")
-				end,
-				supported_aspects = suppasp,
-				getstate = f.ls,
-				setstate = function(pos, node, newstate)
-					if newstate == f.als then
-						advtrains.ndb.swap_node(pos, {name = "advtrains:signal_"..f.as..rotation, param2 = node.param2}, true)
+				main_aspects = main_aspects,
+				apply_aspect = simple_apply_aspect("advtrains:signal_off"..rotation, "advtrains:signal_on"..rotation),
+				get_aspect_info = function() return aspect(r=="on") end,
+				node_state = f.ls,
+				node_state_map = { red = "advtrains:signal_off"..rotation, green = "advtrains:signal_on"..rotation},
+				node_on_switch_state = function(pos, new_node, old_state, new_state)
+					if advtrains.interlocking then
+						-- forcefully clears any set aspect, so that aspect system doesnt override it again
+						advtrains.interlocking.signal.unregister_aspect(pos)
+						-- notify trains
+						advtrains.interlocking.signal.notify_trains(pos)
 					end
 				end,
 			},
 			can_dig = can_dig_func,
 			after_dig_node = after_dig_func,
-			check_for_pole = true,
+			--TODO add rotation using trackworker
 		})
-		advtrains.trackplacer.add_worked("advtrains:signal", r, rotation, nil)
+		-- advtrains.trackplacer.add_worked("advtrains:signal", r, rotation, nil)
 	end
 	
 	local crea=1
@@ -197,7 +187,7 @@ for r,f in pairs({on={as="off", ls="green", als="red"}, off={as="on", ls="red",
 		b={-1/4, -1/2, 1/2 - 1/8, 1/4, 1/2, 1/2},
 		p={-1/4, -1/2, 5/8, 1/4, 1/2, 7/8},
 	}) do
-		local def ={
+		local def = {
 			drawtype = "mesh",
 			paramtype="light",
 			paramtype2="4dir",
@@ -223,9 +213,6 @@ for r,f in pairs({on={as="off", ls="green", als="red"}, off={as="on", ls="red",
 				rules = mrules_wallsignal,
 				["action_"..f.as] = function (pos, node)
 					advtrains.setstate(pos, f.als, node)
-					if advtrains.interlocking then
-						advtrains.interlocking.signal_on_aspect_changed(pos)
-					end
 				end
 			}},
 			on_rightclick=function(pos, node, player)
@@ -237,28 +224,21 @@ for r,f in pairs({on={as="off", ls="green", als="red"}, off={as="on", ls="red",
 					advtrains.interlocking.show_ip_form(pos, pname)
 				elseif advtrains.check_turnout_signal_protection(pos, player:get_player_name()) then
 					advtrains.setstate(pos, f.als, node)
-					if advtrains.interlocking then
-						advtrains.interlocking.signal_on_aspect_changed(pos)
-					end
 				end
 			end,
-			-- new signal API
+			-- very new signal API
 			advtrains = {
-				set_aspect = function(pos, node, asp)
-					if asp.main ~= 0 then
-						advtrains.ndb.swap_node(pos, {name = "advtrains:signal_wall_"..loc.."_on", param2 = node.param2}, true)
-					else
-						advtrains.ndb.swap_node(pos, {name = "advtrains:signal_wall_"..loc.."_off", param2 = node.param2}, true)
-					end
-				end,
-				get_aspect = function(pos, node)
-					return aspect(r=="on")
-				end,
-				supported_aspects = suppasp,
-				getstate = f.ls,
-				setstate = function(pos, node, newstate)
-					if newstate == f.als then
-						advtrains.ndb.swap_node(pos, {name = "advtrains:signal_wall_"..loc.."_"..f.as, param2 = node.param2}, true)
+				main_aspects = main_aspects,
+				apply_aspect = simple_apply_aspect("advtrains:signal_wall_"..loc.."_off", "advtrains:signal_wall_"..loc.."_on"),
+				get_aspect_info = function() return aspect(r=="on") end,
+				node_state = f.ls,
+				node_state_map = { red = "advtrains:signal_wall_"..loc.."_off", green = "advtrains:signal_wall_"..loc.."_on" },
+				node_on_switch_state = function(pos, new_node, old_state, new_state)
+					if advtrains.interlocking then
+						-- forcefully clears any set aspect, so that aspect system doesnt override it again
+						advtrains.interlocking.signal.unregister_aspect(pos)
+						-- notify trains
+						advtrains.interlocking.signal.notify_trains(pos)
 					end
 				end,
 			},
@@ -298,22 +278,15 @@ minetest.register_node("advtrains:across_off", {
 	mesecons = {effector = {
 		rules = advtrains.meseconrules,
 		action_on = function (pos, node)
-			minetest.get_meta(pos):set_int("crossing_state", 0)
 			advtrains.ndb.swap_node(pos, {name = "advtrains:across_on", param2 = node.param2}, true)
 		end
 	}},
 	advtrains = {
-		getstate = "off",
-		setstate = function(pos, node, newstate)
-			if newstate == "on" then
-				minetest.get_meta(pos):set_int("crossing_state", 0)
-				advtrains.ndb.swap_node(pos, {name = "advtrains:across_on", param2 = node.param2}, true)
-			end
-		end,
+		node_state = "off",
+		node_state_map = { on = "advtrains:across_on", off = "advtrains:across_off" },
 	},
 	on_rightclick=function(pos, node, player)
 		if advtrains.check_turnout_signal_protection(pos, player:get_player_name()) then
-			minetest.get_meta(pos):set_int("crossing_state", 0)
 			advtrains.ndb.swap_node(pos, {name = "advtrains:across_on", param2 = node.param2}, true)
 		end
 	end,
@@ -330,7 +303,7 @@ minetest.register_node("advtrains:across_on", {
 	mesh = "advtrains_across.obj",
 	tiles = {{name="advtrains_across_anim.png", animation={type="vertical_frames", aspect_w=64, aspect_h=64, length=1.0}}},
 	drop="advtrains:across_off",
-	description=attrans("Andrew's Cross (on) (you hacker you)"),
+	description=attrans("Andrew's Cross"),
 	groups = {
 		cracky=3,
 		not_blocking_trains=1,
@@ -346,13 +319,9 @@ minetest.register_node("advtrains:across_on", {
 		end
 	}},
 	advtrains = {
-		getstate = "on",
-		setstate = function(pos, node, newstate)
-			if newstate == "off" then
-				advtrains.ndb.swap_node(pos, {name = "advtrains:across_off", param2 = node.param2}, true)
-			end
-		end,
-		fallback_state = "off",
+		node_state = "on",
+		node_state_map = { on = "advtrains:across_on", off = "advtrains:across_off" },
+		node_fallback_state = "off",
 	},
 	on_rightclick=function(pos, node, player)
 		if advtrains.check_turnout_signal_protection(pos, player:get_player_name()) then
@@ -374,7 +343,7 @@ minetest.register_abm(
 	{
         label = "Sound for Level Crossing",
         nodenames = {"advtrains:across_on"},
-        interval = 1,
+        interval = 3,
         chance = 1,
         action = function(pos, node, active_object_count, active_object_count_wider)
 			local meta = minetest.get_meta(pos)
diff --git a/advtrains/sounds/advtrains_crossing_bell.ogg b/advtrains/sounds/advtrains_crossing_bell.ogg
index 3235b52..2b441ae 100644
--- a/advtrains/sounds/advtrains_crossing_bell.ogg
+++ b/advtrains/sounds/advtrains_crossing_bell.ogg
diff --git a/advtrains/spec/poconvert_spec.lua b/advtrains/spec/poconvert_spec.lua
new file mode 100644
index 0000000..51f33e7
--- /dev/null
+++ b/advtrains/spec/poconvert_spec.lua
@@ -0,0 +1,70 @@
+package.path = "../?.lua;" .. package.path
+advtrains = {}
+_G.advtrains = advtrains
+local poconvert = require("poconvert")
+
+describe("PO file converter", function()
+	it("should convert PO files", function()
+		assert.equals([[
+# textdomain: foo
+foo=bar
+baz=
+#@=wh\at\\@n=@=w\as\\@n
+multiline@nstrings=multiline@nresult
+with context?=oder doch nicht]], poconvert.from_string("foo", [[
+msgid ""
+msgstr "whatever metadata"
+
+msgid "foo"
+msgstr "bar"
+
+msgid "baz"
+msgstr ""
+
+#, fuzzy
+msgid "=wh\\at\\\\\n"
+msgstr "=w\\as\\\\\n"
+
+msgid "multi"
+"line\n"
+"strings"
+msgstr "multi"
+"line\n"
+"result"
+
+msgctxt "i18n context"
+msgid "with context?"
+msgstr "oder doch nicht"]]))
+	end)
+	it("should reject invalid tokens", function()
+		assert.has.errors(function()
+			poconvert.from_string("", [[
+foo ""
+bar ""]])
+		end, "Invalid token: foo")
+	end)
+	it("should reject entries without a msgstr", function()
+		assert.has.errors(function()
+			poconvert.from_string("", [[msgid "foo"]])
+		end, "Missing translated string")
+	end)
+	it("should reject entries without a msgid", function()
+		assert.has.errors(function()
+			poconvert.from_string("", [[msgstr "foo"]])
+		end, "Missing untranslated string")
+	end)
+	it("should reject entries with improperly enclosed strings", function()
+		assert.has.errors(function()
+			poconvert.from_string("", [[
+msgid "foo"
+msgstr "bar \]])
+		end, "String extends beyond the end of input")
+	end)
+	it("should reject incomplete input", function()
+		assert.has.errors(function()
+			poconvert.from_string("", [[
+msgid "foo"
+msgstr]])
+		end, "No string provided for msgstr")
+	end)
+end)
diff --git a/advtrains/spec/texture_spec.lua b/advtrains/spec/texture_spec.lua
new file mode 100644
index 0000000..2e3bd5d
--- /dev/null
+++ b/advtrains/spec/texture_spec.lua
@@ -0,0 +1,19 @@
+package.path = "../?.lua;" .. package.path
+local T = require "texture"
+
+describe("Texture creation", function()
+	it("works", function()
+		assert.same("^.png", tostring(T.raw"^.png"))
+		assert.same("foo\\:bar.png", tostring(T"foo:bar.png"))
+	end)
+end)
+
+describe("Texture modifiers", function()
+	it("work", function()
+		assert.same("x^[colorize:c", tostring(T"x":colorize"c"))
+		assert.same("x^[colorize:c:alpha", tostring(T"x":colorize("c", "alpha")))
+		assert.same("x^[multiply:c", tostring(T"x":multiply"c"))
+		assert.same("x^[resize:2x3", tostring(T"x":resize(2, 3)))
+		assert.same("x^[transformI", tostring(T"x":transform"I"))
+	end)
+end)
diff --git a/advtrains/spec/wagons_spec.lua b/advtrains/spec/wagons_spec.lua
new file mode 100644
index 0000000..df0687b
--- /dev/null
+++ b/advtrains/spec/wagons_spec.lua
@@ -0,0 +1,40 @@
+require "mineunit"
+mineunit "core"
+
+_G.advtrains = {
+	wagon_load_range = 32
+}
+sourcefile "wagons"
+
+local myproto = {_test = true}
+advtrains.register_wagon(":mywagon", myproto, "My wagon", "", false)
+advtrains.register_wagon_alias(":myalias", ":mywagon")
+advtrains.register_wagon_alias(":myotheralias", ":myalias")
+
+local myotherproto = {_other = true}
+advtrains.register_wagon(":noalias", myotherproto, "Not aliased wagon", "", false)
+advtrains.register_wagon_alias(":noalias", ":mywagon")
+
+advtrains.register_wagon_alias(":nilalias", ":nil")
+
+advtrains.register_wagon_alias(":R1", ":R2")
+advtrains.register_wagon_alias(":R2", ":R3")
+advtrains.register_wagon_alias(":R3", ":R1")
+
+describe("wagon alias system", function()
+	it("should work", function()
+		assert.same({":mywagon", myproto}, {advtrains.resolve_wagon_alias(":myalias")})
+		assert.equal(myproto, advtrains.wagon_prototypes[":myalias"])
+		assert.same({":mywagon", myproto}, {advtrains.resolve_wagon_alias(":myotheralias")})
+	end)
+	it("should respect wagon registration", function()
+		assert.same({":noalias", myotherproto}, {advtrains.resolve_wagon_alias(":noalias")})
+	end)
+	it("should handle recursive loops", function()
+		assert.same({}, {advtrains.resolve_wagon_alias(":R1")})
+	end)
+	it("should return nil for missing entries", function()
+		assert.same({}, {advtrains.resolve_wagon_alias(":what")})
+		assert.same({}, {advtrains.resolve_wagon_alias(":nilalias")})
+	end)
+end)
diff --git a/advtrains/texture.lua b/advtrains/texture.lua
new file mode 100644
index 0000000..e6d83b0
--- /dev/null
+++ b/advtrains/texture.lua
@@ -0,0 +1,228 @@
+local tx = {}
+setmetatable(tx, {__call = function(_, ...) return tx.base(...) end})
+
+function tx.escape(str)
+	return (string.gsub(tostring(str), [[([%^:\])]], [[\%1]]))
+end
+
+local function getargs(...)
+	return select("#", ...), {...}
+end
+
+local function curry(f, x)
+	return function(...)
+		return f(x, ...)
+	end
+end
+
+local function xmkmodifier(func)
+	return function(self, ...)
+		table.insert(self, (func(...)))
+		return self
+	end
+end
+
+local function mkmodifier(fmt, spec)
+	return xmkmodifier(function(...)
+		local count = select("#", ...)
+		local args = {...}
+		for k, f in pairs(spec) do
+			args[k] = f(args[k])
+		end
+		return string.format(fmt, unpack(args, 1, count))
+	end)
+end
+
+-- Texture object
+local tx_lib = {}
+local tx_mt = {
+	__index = tx_lib,
+	__tostring = function(self)
+		return table.concat(self, "^")
+	end,
+	__concat = function(a, b)
+		return tx.raw(("%s^%s"):format(tostring(a), tostring(b)))
+	end,
+}
+
+function tx.raw(str)
+	return setmetatable({str}, tx_mt)
+end
+function tx.base(str)
+	return tx.raw(tx.escape(str))
+end
+-- TODO: use [fill when 5.8.0 becomes widely used client-side
+function tx.fill(w, h, color)
+	return tx"advtrains_hud_bg.png":resize(w, h):colorize(color)
+end
+
+-- Most texture modifiers
+tx_lib.colorize = xmkmodifier(function(c, a)
+	local str = ("[colorize:%s"):format(tx.escape(c))
+	if a then
+		str = str .. ":" .. a
+	end
+	return str
+end)
+tx_lib.multiply = mkmodifier("[multiply:%s", {tx.escape})
+tx_lib.resize = mkmodifier("[resize:%dx%d", {})
+tx_lib.transform = mkmodifier("[transform%s", {tx.escape})
+
+-- [combine
+
+local combine = {}
+
+function combine:add(x, y, ent)
+	table.insert(self.st, ([[%d,%d=%s]]):format(x, y, tx.escape(tostring(ent))))
+	return self
+end
+
+local combine_mt = {
+	__index = combine,
+	__tostring = function(self)
+		return table.concat(self.st, ":")
+	end,
+}
+
+function tx.combine(w, h, bg)
+	local base = ("[combine:%dx%d"):format(w, h)
+	local obj = setmetatable({width = w, height = h, st = {base}}, combine_mt)
+	if bg then
+		obj:add_fill(0, 0, w, h, bg)
+	end
+	return obj
+end
+
+function combine:add_fill(x, y, ...)
+	return self:add(x, y, tx.fill(...))
+end
+
+local function add_multicolor_fill(n, self, x, y, w, h, ...)
+	local argc, argv = getargs(...)
+	local t = 0
+	for k = 1, argc, 2 do
+		t = t + argv[k]
+	end
+	local newargs = {x, y, w, h}
+	local sk, wk = n, n+2
+	local s = newargs[wk]/t
+	for k = 1, argc, 2 do
+		local v = argv[k] * s
+		newargs[wk] = v
+		newargs[5] = argv[k+1]
+		self:add_fill(unpack(newargs))
+		newargs[sk] = newargs[sk] + v
+	end
+	return self
+end
+combine.add_multicolor_fill_topdown = curry(add_multicolor_fill, 2)
+combine.add_multicolor_fill_leftright = curry(add_multicolor_fill, 1)
+
+local function add_segmentbar(n, self, x, y, w, h, m, c, ...)
+	local argc, argv = getargs(...)
+	local baseargs = {x, y, w, h}
+	local ss = (baseargs[n+2]+m)/c
+	local bs = ss - m
+	for k = 1, argc, 3 do
+		local lower, upper, fill = argv[k], argv[k+1], argv[k+2]
+		lower = math.max(0, math.floor(lower))+1
+		upper = math.min(c, math.floor(upper))
+		if lower <= upper then
+			local args = {x, y, w, h, fill}
+			args[n+2] = bs
+			args[n] = args[n] + ss*(lower-1)
+			for i = lower, upper do
+				self:add_fill(unpack(args))
+				args[n] = args[n] + ss
+			end
+		end
+	end
+	return self
+end
+combine.add_segmentbar_topdown = curry(add_segmentbar, 2)
+combine.add_segmentbar_leftright = curry(add_segmentbar, 1)
+
+local function add_lever(n, self, x, y, w, h, hs, ss, val, hf, sf)
+	local baseargs = {x, y, w, h}
+	local sargs = {x, y, w, h, sf}
+	sargs[5-n] = ss
+	sargs[n+2] = baseargs[n+2] + ss - hs
+	for k = 1, 2 do
+		sargs[k] = baseargs[k] + (baseargs[k+2] - sargs[k+2])/2
+	end
+	self:add_fill(unpack(sargs))
+	local hargs = {x, y, w, h, hf}
+	hargs[n+2] = hs
+	hargs[n] = baseargs[n] + (baseargs[n+2]-hs)*val
+	self:add_fill(unpack(hargs))
+	return self
+end
+combine.add_lever_topdown = curry(add_lever, 2)
+combine.add_lever_leftright = curry(add_lever, 1)
+
+--[[ Seven-segment display
+ -1-
+6   2
+ -7-
+5   3
+ -4-
+--]]
+local sevenseg_digits = {
+	["0"] = {1, 2, 3, 4, 5, 6},
+	["1"] = {2, 3},
+	["2"] = {1, 2, 4, 5, 7},
+	["3"] = {1, 2, 3, 4, 7},
+	["4"] = {2, 3, 6, 7},
+	["5"] = {1, 3, 4, 6, 7},
+	["6"] = {1, 3, 4, 5, 6, 7},
+	["7"] = {1, 2, 3},
+	["8"] = {1, 2, 3, 4, 5, 6, 7},
+	["9"] = {1, 2, 3, 4, 6, 7},
+}
+
+function combine:add_str7seg(x0, y0, tw, th, str, fill)
+	--[[ w and h (as width/height of individual (horizontal) segments) have the following properties:
+	tw = n(w+3h)-h
+	th = 2w+3h
+	--]]
+	local len = #str
+	local h = (2*tw-len*th)/(3*len-2)
+	local w = (th-3*h)/2
+	local ws = w+3*h
+	local segs = {
+		{h, 0, w, h},
+		{w+h, h, h, w},
+		{w+h, w+2*h, h, w},
+		{h, 2*(w+h), w, h},
+		{0, w+2*h, h, w},
+		{0, h, h, w},
+		{h, w+h, w, h},
+	}
+	for i = 1, len do
+		for _, k in pairs(sevenseg_digits[string.sub(str, i, i)] or {}) do
+			local s = segs[k]
+			self:add_fill(s[1]+x0, s[2]+y0, s[3], s[4], fill)
+		end
+		x0 = x0 + ws
+	end
+	return self
+end
+
+function combine:add_n7seg(x, y, w, h, n, prec, ...)
+	if not (type(n) == "number" and type(prec) == "number") then
+		error("passed non-numeric value or precision to numeric display")
+	elseif prec < 0 then
+		error("negative length")
+	end
+	local pfx = ""
+	if n >= 0 then
+		n = math.min(10^prec-1, n)
+	else
+		n = math.min(10^(prec-1)-1, -n)
+		pfx = "-"
+	end
+	local str = ("%d"):format(n)
+	return self:add_str7seg(x, y, w, h, pfx .. ("0"):rep(prec-#str-#pfx) .. str, ...)
+end
+
+return tx
diff --git a/advtrains/textures/advtrains_wagon_prop_tool.png b/advtrains/textures/advtrains_wagon_prop_tool.png
new file mode 100644
index 0000000..6352c55
--- /dev/null
+++ b/advtrains/textures/advtrains_wagon_prop_tool.png
diff --git a/advtrains/track_reg_helper.lua b/advtrains/track_reg_helper.lua
new file mode 100644
index 0000000..97ab069
--- /dev/null
+++ b/advtrains/track_reg_helper.lua
@@ -0,0 +1,779 @@
+-- New track registration helper
+-- Retains the old table-template-based definition format, but adapts it to the new (advtrains 2.5)
+-- track definition system
+-- Note to future: This is actually just a work-saver, avoiding me to port over all the crossing nodes as well as the linetrack tracks.
+-- Future track mods should please directly use the appropriate advtrains.register_node_4rot() API and not rely on this!
+
+--definition preparation
+local function conns(c1, c2, r1, r2) return {{c=c1, y=r1}, {c=c2, y=r2}} end
+local function conns3(c1, c2, c3, r1, r2, r3) return {{c=c1, y=r1}, {c=c2, y=r2}, {c=c3, y=r3}} end
+
+advtrains.ap={}
+advtrains.ap.t_30deg_flat={
+	v25_format = true,
+	regstep=1,
+	variant={
+		st={
+			conns = conns(0,8),
+			desc = "straight",
+			tpdouble = true,
+			tpsingle = true,
+			trackworker = "cr",
+		},
+		cr={
+			conns = conns(0,7),
+			desc = "curve",
+			tpdouble = true,
+			trackworker = "swlst",
+		},
+		swlst={
+			conns = conns3(0,8,7),
+			desc = "left switch (straight)",
+			trackworker = "swrst",
+			switchalt = "cr",
+			switchmc = "on",
+			switchst = "st",
+			switchprefix = "swl",
+			conn_map = {2,1,1},
+			stmref = "swl",
+		},
+		swlcr={
+			conns = conns3(0,8,7),
+			desc = "left switch (curve)",
+			trackworker = "swrcr",
+			switchalt = "st",
+			switchmc = "off",
+			switchst = "cr",
+			switchprefix = "swl",
+			conn_map = {3,1,1},
+			stmref = "swl",
+		},
+		swrst={
+			conns = conns3(0,8,9),
+			desc = "right switch (straight)",
+			trackworker = "st",
+			switchalt = "cr",
+			switchmc = "on",
+			switchst = "st",
+			switchprefix = "swr",
+			conn_map = {2,1,1},
+			stmref = "swr",
+		},
+		swrcr={
+			conns = conns3(0,8,9),
+			desc = "right switch (curve)",
+			trackworker = "st",
+			switchalt = "st",
+			switchmc = "off",
+			switchst = "cr",
+			switchprefix = "swr",
+			conn_map = {3,1,1},
+			stmref = "swr",
+		},
+	},
+	regtp=true,
+	tpdefault="st",
+	trackworker={
+		["swrcr"]="st",
+		["swrst"]="st",
+		["cr"]="swlst",
+		["swlcr"]="swrcr",
+		["swlst"]="swrst",
+	},
+	rotation={"", "_30", "_45", "_60"},
+	statemaps = {
+		swl = { st = "swlst", cr = "swlcr"},
+		swr = { st = "swrst", cr = "swrcr"}
+	}
+}
+advtrains.ap.t_yturnout={
+	v25_format = true,
+	regstep=1,
+	variant={
+		l={
+			conns = conns3(0,7,9),
+			desc = "Y-turnout (left)",
+			switchalt = "r",
+			switchmc = "off",
+			switchst = "l",
+			switchprefix = "",
+			conn_map = {2,1,1},
+			stmref = "sw",
+			tpsingle = true,
+		},
+		r={
+			conns = conns3(0,7,9),
+			desc = "Y-turnout (right)",
+			switchalt = "l",
+			switchmc = "on",
+			switchst = "r",
+			switchprefix = "",
+			conn_map = {3,1,1},
+			stmref = "sw",
+		}
+	},
+	regtp=true,
+	tpdefault="l",
+	rotation={"", "_30", "_45", "_60"},
+	statemaps = {
+		sw = { l = "l", r = "r"}
+	}
+}
+advtrains.ap.t_s3way={
+	v25_format = true,
+	regstep=1,
+	variant={
+		l={
+			conns = { {c=0}, {c=7}, {c=8}, {c=9}},
+			desc = "3-way turnout (left)",
+			switchalt = "s",
+			switchst="l",
+			switchprefix = "",
+			conn_map = {2,1,1,1},
+			stmref = "sw",
+		},
+		s={
+			conns = { {c=0}, {c=7}, {c=8}, {c=9}},
+			desc = "3-way turnout (straight)",
+			switchalt ="r",
+			switchst = "s",
+			switchprefix = "",
+			conn_map = {3,1,1,1},
+			stmref = "sw",
+			tpsingle = true,
+		},
+		r={
+			conns = { {c=0}, {c=7}, {c=8}, {c=9}},
+			desc = "3-way turnout (right)",
+			switchalt = "l",
+			switchst="r",
+			switchprefix = "",
+			conn_map = {4,1,1,1},
+			stmref = "sw",
+		}
+	},
+	regtp=true,
+	tpdefault="l",
+	rotation={"", "_30", "_45", "_60"},
+	statemaps = {
+		sw = { l = "l", s = "s", r = "r"}
+	}
+}
+advtrains.ap.t_30deg_slope={
+	v25_format = true,
+	regstep=1,
+	variant={
+		vst1={conns = conns(8,0,0,0.5), rail_y = 0.25, desc = "steep uphill 1/2", slope=true},
+		vst2={conns = conns(8,0,0.5,1), rail_y = 0.75, desc = "steep uphill 2/2", slope=true},
+		vst31={conns = conns(8,0,0,0.33), rail_y = 0.16, desc = "uphill 1/3", slope=true},
+		vst32={conns = conns(8,0,0.33,0.66), rail_y = 0.5, desc = "uphill 2/3", slope=true},
+		vst33={conns = conns(8,0,0.66,1), rail_y = 0.83, desc = "uphill 3/3", slope=true},
+		vst41={conns = conns(8,0,0,1/4), rail_y = 1/4 - 1/8, desc = "uphill 1/4", slope=true},
+		vst42={conns = conns(8,0,1/4,2/4), rail_y = 2/4 - 1/8, desc = "uphill 2/4", slope=true},
+		vst43={conns = conns(8,0,2/4,3/4), rail_y = 3/4 - 1/8, desc = "uphill 3/4", slope=true},
+		vst44={conns = conns(8,0,3/4,1), rail_y = 1 - 1/8, desc = "uphill 4/4", slope=true},
+		vst51={conns = conns(8,0,0,1/5), rail_y = 1/5 - 1/10, desc = "uphill 1/5", slope=true},
+		vst52={conns = conns(8,0,1/5,2/5), rail_y = 2/5 - 1/10, desc = "uphill 2/5", slope=true},
+		vst53={conns = conns(8,0,2/5,3/5), rail_y = 3/5 - 1/10, desc = "uphill 3/5", slope=true},
+		vst54={conns = conns(8,0,3/5,4/5), rail_y = 4/5 - 1/10, desc = "uphill 4/5", slope=true},
+		vst55={conns = conns(8,0,4/5,1), rail_y = 5/5 - 1/10, desc = "uphill 5/5", slope=true},
+		vst61={conns = conns(8,0,0,1/6), rail_y = 1/6 - 1/12, desc = "uphill 1/6", slope=true},
+		vst62={conns = conns(8,0,1/6,2/6), rail_y = 2/6 - 1/12, desc = "uphill 2/6", slope=true},
+		vst63={conns = conns(8,0,2/6,3/6), rail_y = 3/6 - 1/12, desc = "uphill 3/6", slope=true},
+		vst64={conns = conns(8,0,3/6,4/6), rail_y = 4/6 - 1/12, desc = "uphill 4/6", slope=true},
+		vst65={conns = conns(8,0,4/6,5/6), rail_y = 5/6 - 1/12, desc = "uphill 5/6", slope=true},
+		vst66={conns = conns(8,0,5/6,1), rail_y = 6/6 - 1/12, desc = "uphill 6/6", slope=true},
+		vst71={conns = conns(8,0,0,1/7), rail_y = 1/7 - 1/14, desc = "uphill 1/7", slope=true},
+		vst72={conns = conns(8,0,1/7,2/7), rail_y = 2/7 - 1/14, desc = "uphill 2/7", slope=true},
+		vst73={conns = conns(8,0,2/7,3/7), rail_y = 3/7 - 1/14, desc = "uphill 3/7", slope=true},
+		vst74={conns = conns(8,0,3/7,4/7), rail_y = 4/7 - 1/14, desc = "uphill 4/7", slope=true},
+		vst75={conns = conns(8,0,4/7,5/7), rail_y = 5/7 - 1/14, desc = "uphill 5/7", slope=true},
+		vst76={conns = conns(8,0,5/7,6/7), rail_y = 6/7 - 1/14, desc = "uphill 6/7", slope=true},
+		vst77={conns = conns(8,0,6/7,1), rail_y = 7/7 - 1/14, desc = "uphill 7/7", slope=true},
+		vst81={conns = conns(8,0,0,1/8), rail_y = 1/8 - 1/16, desc = "uphill 1/8", slope=true},
+		vst82={conns = conns(8,0,1/8,2/8), rail_y = 2/8 - 1/16, desc = "uphill 2/8", slope=true},
+		vst83={conns = conns(8,0,2/8,3/8), rail_y = 3/8 - 1/16, desc = "uphill 3/8", slope=true},
+		vst84={conns = conns(8,0,3/8,4/8), rail_y = 4/8 - 1/16, desc = "uphill 4/8", slope=true},
+		vst85={conns = conns(8,0,4/8,5/8), rail_y = 5/8 - 1/16, desc = "uphill 5/8", slope=true},
+		vst86={conns = conns(8,0,5/8,6/8), rail_y = 6/8 - 1/16, desc = "uphill 6/8", slope=true},
+		vst87={conns = conns(8,0,6/8,7/8), rail_y = 7/8 - 1/16, desc = "uphill 7/8", slope=true},
+		vst88={conns = conns(8,0,7/8,1), rail_y = 8/8 - 1/16, desc = "uphill 8/8", slope=true},
+	},
+	regsp=true,
+	slopeplacer={
+		[2]={"vst1", "vst2"},
+		[3]={"vst31", "vst32", "vst33"},
+		[4]={"vst41", "vst42", "vst43", "vst44"},
+		[5]={"vst51", "vst52", "vst53", "vst54", "vst55"},
+		[6]={"vst61", "vst62", "vst63", "vst64", "vst65", "vst66"},
+		[7]={"vst71", "vst72", "vst73", "vst74", "vst75", "vst76", "vst77"},
+		[8]={"vst81", "vst82", "vst83", "vst84", "vst85", "vst86", "vst87", "vst88"},
+		max=8,--highest entry
+	},
+	slopeplacer_45={
+		[2]={"vst1_45", "vst2_45"},
+		max=2,
+	},
+	rotation={"", "_30", "_45", "_60"},
+	trackworker={},
+	increativeinv={},
+}
+advtrains.ap.t_30deg_straightonly={
+	v25_format = true,
+	regstep=1,
+	variant={
+		st={
+			conns = conns(0,8),
+			desc = "straight",
+			tpdouble = true,
+			tpsingle = true,
+			trackworker = "st",
+		},
+	},
+	regtp=true,
+	tpdefault="st",
+	rotation={"", "_30", "_45", "_60"},
+}
+advtrains.ap.t_30deg_straightonly_noplacer={
+	v25_format = true,
+	regstep=1,
+	variant={
+		st={
+			conns = conns(0,8),
+			desc = "straight",
+			tpdouble = true,
+			tpsingle = true,
+			trackworker = "st",
+		},
+	},
+	tpdefault="st",
+	rotation={"", "_30", "_45", "_60"},
+}
+advtrains.ap.t_45deg={
+	v25_format = true,
+	regstep=2,
+	variant={
+		st={
+			conns = conns(0,8),
+			desc = "straight",
+			tpdouble = true,
+			tpsingle = true,
+			trackworker = "cr",
+		},
+		cr={
+			conns = conns(0,6),
+			desc = "curve",
+			tpdouble = true,
+			trackworker = "swlst",
+		},
+		swlst={
+			conns = conns3(0,8,6),
+			desc = "left switch (straight)",
+			trackworker = "swrst",
+			switchalt = "cr",
+			switchmc = "on",
+			switchst = "st",
+		},
+		swlcr={
+			conns = conns3(0,6,8),
+			desc = "left switch (curve)",
+			trackworker = "swrcr",
+			switchalt = "st",
+			switchmc = "off",
+			switchst = "cr",
+		},
+		swrst={
+			conns = conns3(0,8,10),
+			desc = "right switch (straight)",
+			trackworker = "st",
+			switchalt = "cr",
+			switchmc = "on",
+			switchst = "st",
+		},
+		swrcr={
+			conns = conns3(0,10,8),
+			desc = "right switch (curve)",
+			trackworker = "st",
+			switchalt = "st",
+			switchmc = "off",
+			switchst = "cr",
+		},
+	},
+	regtp=true,
+	tpdefault="st",
+	trackworker={
+		["swrcr"]="st",
+		["swrst"]="st",
+		["cr"]="swlst",
+		["swlcr"]="swrcr",
+		["swlst"]="swrst",
+	},
+	rotation={"", "_30", "_45", "_60"},
+}
+advtrains.ap.t_perpcrossing={
+	v25_format = true,
+	regstep = 1,
+	variant={
+		st={
+			conns = { {c=0}, {c=8}, {c=4}, {c=12} },
+			desc = "perpendicular crossing",
+			tpdouble = true,
+			tpsingle = true,
+			trackworker = "st",
+			conn_map = {2,1,4,3},
+		},
+	},
+	regtp=true,
+	tpdefault="st",
+	rotation={"", "_30", "_45", "_60"},
+}
+advtrains.ap.t_90plusx_crossing={
+	v25_format = true,
+	regstep = 1,
+	variant={
+		["30l"]={
+			conns = { {c=0}, {c=8}, {c=1}, {c=9} },
+			desc = "30/90 degree crossing (left)",
+			tpdouble = true,
+			tpsingle = true,
+			trackworker = "45l",
+			conn_map = {2,1,4,3},
+		},
+		["45l"]={
+			conns = { {c=0}, {c=8}, {c=2}, {c=10} },
+			desc = "45/90 degree crossing (left)",
+			tpdouble = true,
+			tpsingle = true,
+			trackworker = "60l",
+			conn_map = {2,1,4,3},
+		},
+		["60l"]={
+			conns = { {c=0}, {c=8}, {c=3}, {c=11}},
+			desc = "60/90 degree crossing (left)",
+			tpdouble = true,
+			tpsingle = true,
+			trackworker = "60r",
+			conn_map = {2,1,4,3},
+		},
+		["60r"]={
+			conns = { {c=0}, {c=8}, {c=5}, {c=13} },
+			desc = "60/90 degree crossing (right)",
+			tpdouble = true,
+			tpsingle = true,
+			trackworker = "45r",
+			conn_map = {2,1,4,3},
+		},
+		["45r"]={
+			conns = { {c=0}, {c=8}, {c=6}, {c=14} },
+			desc = "45/90 degree crossing (right)",
+			tpdouble = true,
+			tpsingle = true,
+			trackworker = "30r",
+			conn_map = {2,1,4,3},
+		},
+		["30r"]={
+			conns = { {c=0}, {c=8}, {c=7}, {c=15}},
+			desc = "30/90 degree crossing (right)",
+			tpdouble = true,
+			tpsingle = true,
+			trackworker = "30l",
+			conn_map = {2,1,4,3},
+		},
+	},
+	regtp=true,
+	tpdefault="30l",
+	rotation={""},
+	trackworker = {
+		["30l"] = "45l",
+		["45l"] = "60l",
+		["60l"] = "60r",
+		["60r"] = "45r",
+		["45r"] = "30r",
+		["30r"] = "30l",
+	}
+}
+
+advtrains.ap.t_diagonalcrossing = {
+	v25_format = true,
+	regstep=1,
+	variant={
+		["30l45r"]={
+			conns = {{c=1}, {c=9}, {c=6}, {c=14}},
+			desc = "30left-45right diagonal crossing",
+			tpdouble=true,
+			tpsingle=true,
+			trackworker="60l30l",
+			conn_map = {2,1,4,3},
+		},
+		["60l30l"]={
+			conns = {{c=3}, {c=11}, {c=1}, {c=9}},
+			desc = "30left-60right diagonal crossing",
+			tpdouble=true,
+			tpsingle=true,
+			trackworker="60l45r",
+			conn_map = {2,1,4,3},
+		},
+		["60l45r"]={
+			conns = {{c=3}, {c=11}, {c=6}, {c=14}},
+			desc = "60left-45right diagonal crossing",
+			tpdouble=true,
+			tpsingle=true,
+			trackworker="60l60r",
+			conn_map = {2,1,4,3},
+		},
+		["60l60r"]={
+			conns = {{c=3}, {c=11}, {c=5}, {c=13}},
+			desc = "60left-60right diagonal crossing",
+			tpdouble=true,
+			tpsingle=true,
+			trackworker="60r45l",
+			conn_map = {2,1,4,3},
+		},
+		--If 60l60r had a mirror image, it would be here, but it's symmetric.
+		-- 60l60r is also equivalent to 30l30r but rotated 90 degrees.
+		["60r45l"]={
+			conns = {{c=5}, {c=13}, {c=2}, {c=10}},
+			desc = "60right-45left diagonal crossing",
+			tpdouble=true,
+			tpsingle=true,
+			trackworker="60r30r",
+			conn_map = {2,1,4,3},
+		},
+		["60r30r"]={
+			conns = {{c=5}, {c=13}, {c=7}, {c=15}},
+			desc = "60right-30right diagonal crossing",
+			tpdouble=true,
+			tpsingle=true,
+			trackworker="30r45l",
+			conn_map = {2,1,4,3},
+		},
+		["30r45l"]={
+			conns = {{c=7}, {c=15}, {c=2}, {c=10}},
+			desc = "30right-45left diagonal crossing",
+			tpdouble=true,
+			tpsingle=true,
+			trackworker="30l45r",
+			conn_map = {2,1,4,3},
+		},
+
+	},
+	regtp=true,
+	tpdefault="30l45r",
+	rotation={""},
+	trackworker = {
+		["30l45r"] = "60l30l",
+		["60l30l"] = "60l45r",
+		["60l45r"] = "60l60r",
+		["60l60r"] = "60r45l",
+		["60r45l"] = "60r30r",
+		["60r30r"] = "30r45l",
+		["30r45l"] = "30l45r",
+	}
+}
+
+advtrains.trackpresets = advtrains.ap
+
+--definition format: ([] optional)
+--[[{
+	nodename_prefix
+	texture_prefix
+	[shared_texture]
+	models_prefix
+	models_suffix (with dot)
+	[shared_model]
+	formats={
+		st,cr,swlst,swlcr,swrst,swrcr,vst1,vst2
+		(each a table with indices 0-3, for if to register a rail with this 'rotation' table entry. nil is assumed as 'all', set {} to not register at all)
+	}
+	common={} change something on common rail appearance
+}
+[18.12.17] Note on new connection system:
+In order to support real rail crossing nodes and finally make the trackplacer respect switches, I changed the connection system.
+There can be a variable number of connections available. These are specified as tuples {c=<connection>, y=<rely>}
+The table "at_conns" consists of {<conn1>, <conn2>...}
+the "at_rail_y" property holds the value that was previously called "railheight"
+Depending on the number of connections:
+2 conns: regular rail
+3 conns: switch:
+	- when train passes in at conn1, will move out of conn2
+	- when train passes in at conn2 or conn3, will move out of conn1
+4 conns: cross (or cross switch, depending on arrangement of conns):
+	- conn1 <> conn2
+	- conn3 <> conn4
+]]
+
+-- Notify the user if digging the rail is not allowed
+local function can_dig_callback(pos, player)
+	local ok, reason = advtrains.can_dig_or_modify_track(pos)
+	if not ok and player then
+		minetest.chat_send_player(player:get_player_name(), attrans("This track can not be removed!") .. " " .. reason)
+	end
+	return ok
+end
+
+local function append_statemap_suffix(state_map, nnpref, rot)
+	local t = {}
+	for state, nn in pairs(state_map) do
+		t[state] = nnpref .. "_" .. nn .. rot
+	end
+	return t
+end
+
+function advtrains.register_tracks(tracktype, def, preset)
+	if not preset.v25_format then
+		error("advtrains.register_tracks(): A track preset for pre-v2.5 is used with advtrains 2.5+. Mod probably defines own track preset instead of using it from the advtrains.ap table! Please check track mod compatibility!")
+	end
+
+	if preset.regtp then
+		local nnprefix = def.nodename_prefix
+		minetest.register_craftitem(":"..nnprefix.."_placer", {
+			description = def.description,
+			inventory_image = def.texture_prefix.."_placer.png",
+			wield_image = def.texture_prefix.."_placer.png",
+			groups={advtrains_trackplacer=1, digtron_on_place=1},
+			liquids_pointable = false,
+			on_place = function(itemstack, placer, pointed_thing)
+				local name = placer:get_player_name()
+				if not name then
+				   return itemstack, false
+				end
+				if pointed_thing.type=="node" then
+					local pos=pointed_thing.above
+					local upos=vector.subtract(pointed_thing.above, {x=0, y=1, z=0})
+					if not advtrains.check_track_protection(pos, name) then
+						return itemstack, false
+					end
+					if minetest.registered_nodes[minetest.get_node(pos).name] and minetest.registered_nodes[minetest.get_node(pos).name].buildable_to then
+						local s = minetest.registered_nodes[minetest.get_node(upos).name] and minetest.registered_nodes[minetest.get_node(upos).name].walkable
+						if s then
+	--						minetest.chat_send_all(nnprefix)
+							local yaw = placer:get_look_horizontal()
+							advtrains.trackplacer.place_track(pos, nnprefix, name, yaw)
+							if not advtrains.is_creative(name) then
+								itemstack:take_item()
+							end
+						end
+					end
+				end
+				return itemstack, true
+			end,
+		})
+		
+		advtrains.trackplacer.set_default_place_candidate(def.nodename_prefix, def.nodename_prefix.."_"..preset.tpdefault)
+	end
+	if preset.regsp then
+		advtrains.slope.register_placer(def, preset)			
+	end
+	
+	for suffix, var in pairs(preset.variant) do
+		for rotid, rotation in ipairs(preset.rotation) do
+			if not def.formats[suffix] or def.formats[suffix][rotid] then
+				local img_suffix = suffix..rotation
+				local ndef = advtrains.merge_tables({
+					description=def.description.."("..(var.desc or "any")..rotation..")",
+					drawtype = "mesh",
+					paramtype="light",
+					paramtype2="facedir",
+					use_texture_alpha = "clip",
+					walkable = false,
+					selection_box = {
+						type = "fixed",
+						fixed = {-1/2-1/16, -1/2, -1/2, 1/2+1/16, -1/2+2/16, 1/2},
+					},
+					
+					mesh = def.shared_model or (def.models_prefix.."_"..img_suffix..def.models_suffix),
+					tiles = {def.shared_texture or (def.texture_prefix.."_"..img_suffix..".png"), def.second_texture},
+					
+					groups = {
+						attached_node = advtrains.IGNORE_WORLD and 0 or 1,
+						advtrains_track=1,
+						["advtrains_track_"..tracktype]=1,
+						save_in_at_nodedb=1,
+						dig_immediate=2,
+						not_in_creative_inventory=1,
+						not_blocking_trains=1,
+					},
+						
+					can_dig = advtrains.track_can_dig_callback,
+					after_dig_node = advtrains.track_update_callback,
+					after_place_node = advtrains.track_update_callback,
+					
+					at_rail_y = var.rail_y
+				}, def.common or {})
+				
+				if preset.regtp then
+					ndef.drop = def.nodename_prefix.."_placer"
+				end
+				if preset.regsp and var.slope then
+					ndef.drop = def.nodename_prefix.."_slopeplacer"
+				end
+				
+				--connections
+				ndef.at_conns = advtrains.rotate_conn_by(var.conns, (rotid-1)*preset.regstep)
+				-- NEW since 2.5
+				ndef.at_conn_map = var.conn_map
+				
+				local ndef_avt_table = {}
+				
+				if var.switchalt and var.switchst then
+					-- NEW since 2.5
+					ndef.on_rightclick = advtrains.state_node_on_rightclick_callback
+					ndef_avt_table.node_state = var.switchst
+					ndef_avt_table.node_next_state = var.switchalt
+					-- obtain and build statemap
+					local state_map = preset.statemaps[var.stmref]
+					if not state_map then error("On registering "..def.nodename_prefix.."_"..suffix..rotation..", stmref of variant doesn't reference entry in preset.statemaps") end
+					ndef_avt_table.node_state_map = append_statemap_suffix(state_map, def.nodename_prefix, rotation)
+					
+					if var.switchmc then
+						local vswitchalt = var.switchalt
+						ndef.mesecons = {effector = {
+							["action_"..var.switchmc] = function(pos, node) 
+								advtrains.setstate(pos, vswitchalt, node)
+							end,
+							rules=advtrains.meseconrules
+						}}
+					end
+				end
+				
+				local adef={}
+				if def.get_additional_definiton then
+					adef=def.get_additional_definiton(def, preset, suffix, rotation)
+				end
+				ndef = advtrains.merge_tables(ndef, adef)
+				
+				-- insert getstate/setstate functions after merging the additional definitions
+				if ndef_avt_table then
+					ndef.advtrains = advtrains.merge_tables(ndef.advtrains or {}, ndef_avt_table)
+				end
+				
+				-- NEW since 2.5: add appropriate fields for trackworker rotation
+				-- get the next rotation step
+				local num_rots = #preset.rotation
+				if rotid >= num_rots then
+					ndef.advtrains.trackworker_next_rot = def.nodename_prefix.."_"..suffix..preset.rotation[1]
+					ndef.advtrains.trackworker_rot_incr_param2 = true
+				else
+					ndef.advtrains.trackworker_next_rot = def.nodename_prefix.."_"..suffix..preset.rotation[rotid+1]
+				end
+				if var.trackworker then
+					ndef.advtrains.trackworker_next_var = def.nodename_prefix.."_"..var.trackworker..rotation
+				end
+
+				local the_node_name = def.nodename_prefix.."_"..suffix..rotation
+				
+				--trackplacer
+				if preset.regtp and (var.tpsingle or var.tpdouble) then
+					advtrains.trackplacer.register_candidate(
+						def.nodename_prefix,
+						the_node_name,
+						ndef,
+						var.tpsingle,
+						var.tpdouble,
+						true)
+				end
+				
+				-- All set, go ahead and register node!
+				--atdebug("track_reg_helper: Registering ",the_node_name," as",ndef)
+				minetest.register_node(":"..the_node_name, ndef)
+				
+			end
+		end
+	end
+end
+
+-- slope placer. Defined in register_tracks.
+--crafted with rail and gravel
+local sl={}
+function sl.register_placer(def, preset)
+	minetest.register_craftitem(":"..def.nodename_prefix.."_slopeplacer",{
+		description = attrans("@1 Slope", def.description),
+		inventory_image = def.texture_prefix.."_slopeplacer.png",
+		wield_image = def.texture_prefix.."_slopeplacer.png",
+		groups={},
+		on_place = sl.create_slopeplacer_on_place(def, preset)
+	})
+end
+--(itemstack, placer, pointed_thing)
+function sl.create_slopeplacer_on_place(def, preset)
+	return function(istack, player, pt)
+		if not pt.type=="node" then 
+			minetest.chat_send_player(player:get_player_name(), attrans("Can't place: not pointing at node"))
+			return istack 
+		end
+		local pos=pt.above
+		if not pos then 
+			minetest.chat_send_player(player:get_player_name(), attrans("Can't place: not pointing at node"))
+			return istack
+		end
+		local node=minetest.get_node(pos)
+		if not minetest.registered_nodes[node.name] or not minetest.registered_nodes[node.name].buildable_to then
+			minetest.chat_send_player(player:get_player_name(), attrans("Can't place: space occupied!"))
+			return istack
+		end
+		if not advtrains.check_track_protection(pos, player:get_player_name()) then 
+			minetest.record_protection_violation(pos, player:get_player_name())
+			return istack
+		end
+		--determine player orientation (only horizontal component)
+		--get_look_horizontal may not be available
+		local yaw=player.get_look_horizontal and player:get_look_horizontal() or (player:get_look_yaw() - math.pi/2)
+		
+		--rounding unit vectors is a nice way for selecting 1 of 8 directions since sin(30°) is 0.5.
+		local dirvec={x=math.floor(math.sin(-yaw)+0.5), y=0, z=math.floor(math.cos(-yaw)+0.5)}
+		--translate to direction to look up inside the preset table
+		local param2, rot45=({
+			[-1]={
+				[-1]=2,
+				[0]=3,
+				[1]=3,
+				},
+			[0]={
+				[-1]=2,
+				[1]=0,
+				},
+			[1]={
+				[-1]=1,
+				[0]=1,
+				[1]=0,
+				},
+		})[dirvec.x][dirvec.z], dirvec.x~=0 and dirvec.z~=0
+		local lookup=preset.slopeplacer
+		if rot45 then lookup=preset.slopeplacer_45 end
+		
+		--go unitvector forward and look how far the next node is
+		local step=1
+		while step<=lookup.max do
+			local node=minetest.get_node(vector.add(pos, dirvec))
+			--next node solid?
+			if not minetest.registered_nodes[node.name] or not minetest.registered_nodes[node.name].buildable_to or advtrains.is_protected(pos, player:get_player_name()) then 
+				--do slopes of this distance exist?
+				if lookup[step] then
+					if minetest.settings:get_bool("creative_mode") or istack:get_count()>=step then
+						--start placing
+						local placenodes=lookup[step]
+						while step>0 do
+							minetest.set_node(pos, {name=def.nodename_prefix.."_"..placenodes[step], param2=param2})
+							if not minetest.settings:get_bool("creative_mode") then
+								istack:take_item()
+							end
+							step=step-1
+							pos=vector.subtract(pos, dirvec)
+						end
+					else
+						minetest.chat_send_player(player:get_player_name(), attrans("Can't place: Not enough slope items left (@1 required)", step))
+					end
+				else
+					minetest.chat_send_player(player:get_player_name(), attrans("Can't place: There's no slope of length @1",step))
+				end
+				return istack
+			end
+			step=step+1
+			pos=vector.add(pos, dirvec)
+		end
+		minetest.chat_send_player(player:get_player_name(), attrans("Can't place: no supporting node at upper end."))
+		return itemstack
+	end
+end
+
+advtrains.slope=sl
diff --git a/advtrains/trackdb_legacy.lua b/advtrains/trackdb_legacy.lua
deleted file mode 100644
index 99349e8..0000000
--- a/advtrains/trackdb_legacy.lua
+++ /dev/null
@@ -1,27 +0,0 @@
---trackdb_legacy.lua
---loads the (old) track database. the only use for this is to provide data for rails that haven't been written into the ndb database.
---nothing will be saved.
---if the user thinks that he has loaded every track in his world at least once, he can delete the track database.
-
---trackdb[[y][x][z]={conn1, conn2, rely1, rely2, railheight}
-
-
---trackdb keeps its own save file.
-advtrains.fpath_tdb=minetest.get_worldpath().."/advtrains_trackdb2"
-local file, err = io.open(advtrains.fpath_tdb, "r")
-if not file then
-	atprint("Not loading a trackdb file.")
-else
-	local tbl = minetest.deserialize(file:read("*a"))
-	if type(tbl) == "table" then
-		advtrains.trackdb=tbl
-		atprint("Loaded trackdb file.")
-	end
-	file:close()
-end
-	
-
-
-
-
-
diff --git a/advtrains/trackplacer.lua b/advtrains/trackplacer.lua
index 5291923..3278b8c 100644
--- a/advtrains/trackplacer.lua
+++ b/advtrains/trackplacer.lua
@@ -3,475 +3,333 @@
 
 --all new trackplacer code
 local tp={
-	tracks={}
+	groups={}
 }
 
-function tp.register_tracktype(nnprefix, n_suffix)
-	if tp.tracks[nnprefix] then return end--due to the separate registration of slopes and flats for the same nnpref, definition would be overridden here. just don't.
-	tp.tracks[nnprefix]={
-		default=n_suffix,
-		single_conn={},
-		single_conn_1={},
-		single_conn_2={},
-		double_conn={},
-		double_conn_1={},
-		double_conn_2={},
-		--keys:conn1_conn2 (example:1_4)
-		--values:{name=x, param2=x}
-		twcycle={},
-		twrotate={},--indexed by suffix, list, tells order of rotations
-		modify={},
-	}
-end
-function tp.add_double_conn(nnprefix, suffix, rotation, conns)
-	local nodename=nnprefix.."_"..suffix..rotation
-	for i=0,3 do
-		tp.tracks[nnprefix].double_conn[((conns.conn1+4*i)%16).."_"..((conns.conn2+4*i)%16)]={name=nodename, param2=i}
-		tp.tracks[nnprefix].double_conn[((conns.conn2+4*i)%16).."_"..((conns.conn1+4*i)%16)]={name=nodename, param2=i}
-		tp.tracks[nnprefix].double_conn_1[((conns.conn1+4*i)%16).."_"..((conns.conn2+4*i)%16)]={name=nodename, param2=i}
-		tp.tracks[nnprefix].double_conn_2[((conns.conn2+4*i)%16).."_"..((conns.conn1+4*i)%16)]={name=nodename, param2=i}
-	end
-	tp.tracks[nnprefix].modify[nodename]=true
-end
-function tp.add_single_conn(nnprefix, suffix, rotation, conns)
-	local nodename=nnprefix.."_"..suffix..rotation
-	for i=0,3 do
-		tp.tracks[nnprefix].single_conn[((conns.conn1+4*i)%16)]={name=nodename, param2=i}
-		tp.tracks[nnprefix].single_conn[((conns.conn2+4*i)%16)]={name=nodename, param2=i}
-		tp.tracks[nnprefix].single_conn_1[((conns.conn1+4*i)%16)]={name=nodename, param2=i}
-		tp.tracks[nnprefix].single_conn_2[((conns.conn2+4*i)%16)]={name=nodename, param2=i}
-	end
-	tp.tracks[nnprefix].modify[nodename]=true
-end
+--[[ New in version 2.5:
 
+The track placer no longer uses hacky nodename pattern matching.
+The base criterion for rotating or matching tracks is the common "ndef.advtrains.track_place_group" property.
+Only rails where this field is set are considered for replacement. Other rails can still be considered for connection.
+Replacement ("bending") of rails can only happen within their respective track place group. Only two-conn rails are allowed in the trackplacer.
 
-function tp.add_worked(nnprefix, suffix, rotation, cycle_follows)
-	tp.tracks[nnprefix].twcycle[suffix]=cycle_follows
-	if not tp.tracks[nnprefix].twrotate[suffix] then tp.tracks[nnprefix].twrotate[suffix]={} end
-	table.insert(tp.tracks[nnprefix].twrotate[suffix], rotation)
-end
+The track registration functions register the candidates for any given track_place_group in two separate collections:
+- double: tracks that can be used to connect both ends of the rail
+- single: tracks that will be used to connect conn1 when only a single end is to be connected
 
+When track placing is requested, the calling code just supplies the track_place_group to be placed.
 
---[[
-	rewrite algorithm.
-	selection criteria: these will never be changed or even selected:
-	- tracks being already connected on both sides
-	- tracks that are already connected on one side but are not bendable to the desired position
-	the following situations can occur:
-	1. there are two more than two rails around
-		1.1 there is one or more subset(s) that can be directly connected
-			-> choose the first possibility
-		2.2 not
-			-> choose the first one and orient straight
-	2. there's exactly 1 rail around
-		-> choose and orient straight
-	3. there's no rail around
-		-> set straight
-]]
+]]--
 
-local function istrackandbc(pos_p, conn)
-	local tpos = pos_p
-	local cnode=minetest.get_node(advtrains.dirCoordSet(tpos, conn.c))
-	if advtrains.is_track_and_drives_on(cnode.name, advtrains.all_tracktypes) then
-		local cconns=advtrains.get_track_connections(cnode.name, cnode.param2)
-		return advtrains.conn_matches_to(conn, cconns)
-	end
-	--try the same 1 node below
-	tpos = {x=tpos.x, y=tpos.y-1, z=tpos.z}
-	cnode=minetest.get_node(advtrains.dirCoordSet(tpos, conn.c))
-	if advtrains.is_track_and_drives_on(cnode.name, advtrains.all_tracktypes) then
-		local cconns=advtrains.get_track_connections(cnode.name, cnode.param2)
-		return advtrains.conn_matches_to(conn, cconns)
-	end
-	return false
+local function rotate(conn, rot)
+	return (conn + rot) % 16
 end
 
-function tp.find_already_connected(pos)
-	local dnode=minetest.get_node(pos)
-	local dconns=advtrains.get_track_connections(dnode.name, dnode.param2)
-	local found_conn
-	for connid, conn in ipairs(dconns) do
-		if istrackandbc(pos, conn) then
-			if found_conn then --we found one in previous iteration
-				return true, true --signal that it's connected
-			else
-				found_conn = conn.c
-			end
-		end
+-- Register a track node as candidate
+-- tpg: the track place group to register the candidates for
+--        NOTE: This value is automatically added to the node definition (ndef) in field ndef.advtrains.track_place_group!
+-- name, ndef: the node name and node definition table to register
+-- as_single: whether the rail should be considered as candidate for one-endpoint connection
+--            Typically only set for the straight rail variants
+-- as_double: whether the rail should be considered as candidate for two-endpoint connection
+--            Typically set for straights and curves
+-- ignore_2conn_for_legacy_xing: skips the 2-connection assertion - ONLY for compatibility with the legacy crossing nodes, DO NOT USE!
+function tp.register_candidate(tpg, name, ndef, as_single, as_double, ignore_2conn_for_legacy_xing)
+	--atdebug("TP Register candidate:",tpg, name, as_single, as_double)
+	--get or create TP group
+	if not tp.groups[tpg] then
+		tp.groups[tpg] = {double = {}, single1 = {}, single2 = {}, default = {name = name, param2 = 0} }
+		-- note: this causes the first candidate to ever be registered to be the default (which is typically what you want)
+		-- But it can be overwritten using tp.set_default_place_candidate
 	end
-	return found_conn
-end
-function tp.rail_and_can_be_bent(originpos, conn)
-	local pos=advtrains.dirCoordSet(originpos, conn)
-	local newdir=(conn+8)%16
-	local node=minetest.get_node(pos)
-	if not advtrains.is_track_and_drives_on(node.name, advtrains.all_tracktypes) then
-		return false
+	local g = tp.groups[tpg]
+	
+	-- get conns
+	if not ignore_2conn_for_legacy_xing then
+		assert(#ndef.at_conns == 2)
 	end
-	local ndef=minetest.registered_nodes[node.name]
-	local nnpref = ndef and ndef.at_nnpref
-	if not nnpref then return false end
-	local tr=tp.tracks[nnpref]
-	if not tr then return false end
-	if not tr.modify[node.name] then 
-		--we actually can use this rail, but only if it already points to the desired direction.
-		if advtrains.is_track_and_drives_on(node.name, advtrains.all_tracktypes) then
-			local cconns=advtrains.get_track_connections(node.name, node.param2)
-			return advtrains.conn_matches_to(conn, cconns)
+	local c1, c2 = ndef.at_conns[1].c, ndef.at_conns[2].c
+	local is_symmetrical = (rotate(c1, 8) == c2)
+	
+	-- store all possible rotations (param2 values)
+	for i=0,3 do
+		if as_double then
+			g.double[rotate(c1,i*4).."_"..rotate(c2,i*4)] = {name=name, param2=i}
+			if not is_symmetrical then
+				g.double[rotate(c2,i*4).."_"..rotate(c1,i*4)] = {name=name, param2=i}
+				-- if the track is unsymmetric (e.g. a curve), we may require the "wrong" orientation to fill a gap.
+			end
+		end
+		if as_single then
+			g.single1[rotate(c1,i*4)] = {name=name, param2=i}
+			g.single2[rotate(c2,i*4)] = {name=name, param2=i}
 		end
 	end
-	-- If the rail is not allowed to be modified, also only use if already in desired direction
-	if not advtrains.can_dig_or_modify_track(pos) then
-		local cconns=advtrains.get_track_connections(node.name, node.param2)
-		return advtrains.conn_matches_to(conn, cconns)
+	
+	-- Set track place group on the node
+	if not ndef.advtrains then
+		ndef.advtrains = {}
 	end
-	--rail at other end?
-	local adj1, adj2=tp.find_already_connected(pos)
-	if adj1 and adj2 then
-		return false--dont destroy existing track
-	elseif adj1 and not adj2 then
-		if tr.double_conn[adj1.."_"..newdir] then
-			return true--if exists, connect new rail and old end
-		end
-		return false
+	ndef.advtrains.track_place_group = tpg
+end
+
+-- Sets the node that is placed by the track placer when there is no track nearby. param2 defaults to 0
+function tp.set_default_place_candidate(tpg, name, param2)
+	if not tp.groups[tpg] then
+		tp.groups[tpg] = {double = {}, single1 = {}, single2 = {}, default = {name = name, param2 = param2 or 0} }
 	else
-		if tr.single_conn[newdir] then--just rotate old rail to right orientation
-			return true
-		end
-		return false
+		tp.groups[tpg].default = {name = name, param2 = param2 or 0}
 	end
 end
-function tp.bend_rail(originpos, conn)
-	local pos=advtrains.dirCoordSet(originpos, conn)
-	local newdir=advtrains.oppd(conn)
-	local node=minetest.get_node(pos)
-	local ndef=minetest.registered_nodes[node.name]
-	local nnpref = ndef and ndef.at_nnpref
-	if not nnpref then return false end
-	local tr=tp.tracks[nnpref]
-	if not tr then return false end
-	--is rail already connected? no need to bend.
-	local conns=advtrains.get_track_connections(node.name, node.param2)
-	if advtrains.conn_matches_to(conn, conns) then
-		return
+
+local function check_or_bend_rail(origin, dir, pname, commit)
+	local pos = advtrains.pos_add_dir(origin, dir)
+	local back_dir = advtrains.oppd(dir);
+	
+	local node_ok, conns = advtrains.get_rail_info_at(pos)
+	if not node_ok then
+		-- try the node one level below
+		pos.y = pos.y - 1
+		node_ok, conns = advtrains.get_rail_info_at(pos)
 	end
-	--rail at other end?
-	local adj1, adj2=tp.find_already_connected(pos)
-	if adj1 and adj2 then
-		return false--dont destroy existing track
-	elseif adj1 and not adj2 then
-		if tr.double_conn[adj1.."_"..newdir] then
-			advtrains.ndb.swap_node(pos, tr.double_conn[adj1.."_"..newdir])
-			return true--if exists, connect new rail and old end
-		end
+	if not node_ok then
 		return false
-	else
-		if tr.single_conn[newdir] then--just rotate old rail to right orientation
-			advtrains.ndb.swap_node(pos, tr.single_conn[newdir])
+	end
+	-- if one conn of the node here already points towards us, nothing to do
+	for connid, conn in ipairs(conns) do
+		if back_dir == conn.c then
 			return true
 		end
+	end
+	-- can we bend the node here?
+	local node = advtrains.ndb.get_node(pos)
+	local ndef = minetest.registered_nodes[node.name]
+	if not ndef or not ndef.advtrains or not ndef.advtrains.track_place_group then
 		return false
 	end
-end
-function tp.placetrack(pos, nnpref, placer, itemstack, pointed_thing, yaw)
-	--1. find all rails that are likely to be connected
-	local tr=tp.tracks[nnpref]
-	local p_rails={}
-	local p_railpos={}
-	for i=0,15 do
-		if tp.rail_and_can_be_bent(pos, i, nnpref) then
-			p_rails[#p_rails+1]=i
-			p_railpos[i] = pos
-		else
-			local upos = {x=pos.x, y=pos.y-1, z=pos.z}
-			if tp.rail_and_can_be_bent(upos, i, nnpref) then
-				p_rails[#p_rails+1]=i
-				p_railpos[i] = upos
-			end
-		end
+	-- now the track must be two-conn, else it wouldn't be allowed to have track_place_group set.
+	--assert(#conns == 2) -- cannot check here, because of legacy crossing hack
+	-- Is player and game allowed to do this?
+	if not advtrains.can_dig_or_modify_track(pos) then
+		return false
 	end
-	
-	-- try double_conn
-	if #p_rails > 1 then
-		--iterate subsets
-		for k1, conn1 in ipairs(p_rails) do
-			for k2, conn2 in ipairs(p_rails) do
-				if k1~=k2 then
-					local dconn1 = tr.double_conn_1
-					local dconn2 = tr.double_conn_2
-					if not (advtrains.yawToDirection(yaw, conn1, conn2) == conn1) then
-						dconn1 = tr.double_conn_2
-						dconn2 = tr.double_conn_1
-					end
-					-- Checks are made this way round so that dconn1 has priority (this will make arrows of atc rails
-					-- point in the right direction)
-					local using
-					if (dconn2[conn1.."_"..conn2]) then
-						using = dconn2[conn1.."_"..conn2]
-					end
-					if (dconn1[conn1.."_"..conn2]) then
-						using = dconn1[conn1.."_"..conn2]
-					end
-					if using then
-						-- has found a fitting rail in either direction
-						-- if not, continue loop
-						tp.bend_rail(p_railpos[conn1], conn1, nnpref)
-						tp.bend_rail(p_railpos[conn2], conn2, nnpref)
-						advtrains.ndb.swap_node(pos, using)
-						local nname=using.name
-						if minetest.registered_nodes[nname] and minetest.registered_nodes[nname].after_place_node then
-							minetest.registered_nodes[nname].after_place_node(pos, placer, itemstack, pointed_thing)
-						end
-						return
-					end
-				end
-			end
+	if not advtrains.check_track_protection(pos, pname) then
+		return false
+	end
+	-- we confirmed that track can be modified. Does there exist a suitable connection candidate?
+	-- check if there are any unbound ends
+	local bound_connids = {}
+	for connid, conn in ipairs(conns) do
+		local adj_pos, adj_connid = advtrains.get_adjacent_rail(pos, conns, connid)
+		if adj_pos then
+			bound_connids[#bound_connids+1] = connid
 		end
 	end
-	-- try single_conn
-	if #p_rails > 0 then
-		for ix, p_rail in ipairs(p_rails) do
-			local sconn1 = tr.single_conn_1
-			local sconn2 = tr.single_conn_2
-			if not (advtrains.yawToDirection(yaw, p_rail, (p_rail+8)%16) == p_rail) then
-				sconn1 = tr.single_conn_2
-				sconn2 = tr.single_conn_1
-			end
-			if sconn1[p_rail] then
-				local using = sconn1[p_rail]
-				tp.bend_rail(p_railpos[p_rail], p_rail, nnpref)
-				advtrains.ndb.swap_node(pos, using)
-				local nname=using.name
-				if minetest.registered_nodes[nname] and minetest.registered_nodes[nname].after_place_node then
-					minetest.registered_nodes[nname].after_place_node(pos, placer, itemstack, pointed_thing)
-				end
-				return
+	-- depending on the nummber of ends, decide
+	if #bound_connids == 2 then
+		-- rail is within a fixed track, do not break up
+		return false
+	end
+	-- obtain the group table
+	local g = tp.groups[ndef.advtrains.track_place_group]
+	if #bound_connids == 1 then
+		-- we can attempt double
+		local bound_dir = conns[bound_connids[1]].c
+		if g.double[back_dir.."_"..bound_dir] then
+			if commit then
+				advtrains.ndb.swap_node(pos, g.double[back_dir.."_"..bound_dir])
 			end
-			if sconn2[p_rail] then
-				local using = sconn2[p_rail]
-				tp.bend_rail(p_railpos[p_rail], p_rail, nnpref)
-				advtrains.ndb.swap_node(pos, using)
-				local nname=using.name
-				if minetest.registered_nodes[nname] and minetest.registered_nodes[nname].after_place_node then
-					minetest.registered_nodes[nname].after_place_node(pos, placer, itemstack, pointed_thing)
-				end
-				return
+			return true
+		end
+	else
+		-- rail is entirely unbound, we can attempt single1
+		if g.single1[back_dir] then
+			if commit then
+				advtrains.ndb.swap_node(pos, g.single1[back_dir])
 			end
+			return true
 		end
 	end
-	--use default
-	minetest.set_node(pos, {name=nnpref.."_"..tr.default})
-	if minetest.registered_nodes[nnpref.."_"..tr.default] and minetest.registered_nodes[nnpref.."_"..tr.default].after_place_node then
-		minetest.registered_nodes[nnpref.."_"..tr.default].after_place_node(pos, placer, itemstack, pointed_thing)
-	end
 end
 
-local function on_place(itemstack, placer, pointed_thing, nnprefix, def)
-	local s, pos, name
-
-	name = placer:get_player_name()
-	if not name then
-		return itemstack, false
-	end
-
-	if pointed_thing.type ~= "node" then
-		return itemstack, true
-	end
-
-	if pointed_thing.above.y == pointed_thing.under.y then
-		pos = pointed_thing.under
-	else
-		pos = pointed_thing.above
+local function track_place_node(pos, node, ndef_p, pname)
+	--atdebug("track_place_node: ",pos, node)
+	advtrains.ndb.swap_node(pos, node)
+	local ndef = ndef_p or minetest.registered_nodes[node.name]
+	if ndef and ndef.after_place_node then
+		-- resolve player again
+		local player = pname and core.get_player_by_name(pname) or nil
+		ndef.after_place_node(pos, player) -- note: itemstack and pointed_thing are NOT available here anymore (crap!)
 	end
+end
 
-	local upos = vector.offset(pos, 0, -1, 0)
-	local ndef = minetest.registered_nodes[minetest.get_node(pos).name]
-	local undef = minetest.registered_nodes[minetest.get_node(upos).name] -- definition of the node under
 
-	if not advtrains.check_track_protection(pos, name) then
-		return itemstack, false
-	end
-	if not ndef or not ndef.buildable_to then
-		return itemstack, true -- not place for a track
-	end
-	if def.suitable_substrate then
-		s = def.suitable_substrate(upos)
-	else
-		s = undef and undef.walkable
-	end
-	if s then
-		--	minetest.chat_send_all(nnprefix)
-		local yaw = placer:get_look_horizontal()
-		tp.placetrack(pos, nnprefix, placer, itemstack, pointed_thing, yaw)
-		if not minetest.is_creative_enabled(name) then
-			itemstack:take_item()
+-- Main API function to place a track. Replaces the older "placetrack"
+-- This function will attempt to place a track of the specified track placing group at the specified position, connecting it
+-- with neighboring rails. Neighboring rails can themselves be replaced ("bent") within their own track place group,
+-- if the player is permitted to do this.
+-- Order of preference is:
+--    Connect two track ends if possible
+--    Connect one track end if any rail is near
+--    Place the default track if no tracks are near
+-- The function returns true on success.
+function tp.place_track(pos, tpg, pname, yaw)
+	-- 1. collect neighboring tracks and whether they can be connected
+	--atdebug("tp.place_track(",pos, tpg, pname, yaw,")")
+	local cand = {}
+	for i=0,15 do
+		if check_or_bend_rail(pos, i, pname) then
+			cand[#cand+1] = i
 		end
-		return itemstack, true
 	end
-
-	-- try the position below
-	pos.y = pos.y - 1
-	upos.y = upos.y - 1
-	ndef = undef
-	undef = minetest.registered_nodes[minetest.get_node(upos).name]
-	pointed_thing = table.copy(pointed_thing)
-	pointed_thing.below = upos
-	pointed_thing.above = pos
-
-	if not advtrains.check_track_protection(pos, name) then
-		return itemstack, false
-	end
-	if not ndef or not ndef.buildable_to then
-		return itemstack, true -- not place for a track
+	--atdebug("Candidates: ",cand)
+	-- obtain the group table
+	local g = tp.groups[tpg]
+	if not g then
+		error("tp.place_track: for tpg="..tpg.." couldn't find the group table")
 	end
-	if def.suitable_substrate then
-		s = def.suitable_substrate(upos)
-	else
-		s = undef and undef.walkable
+	--atdebug("Group table:",g)
+	-- 2. try all possible two-endpoint connections
+	for k1, conn1 in ipairs(cand) do
+		for k2, conn2 in ipairs(cand) do
+			if k1~=k2 then
+				-- order of conn1/conn2: prefer conn1 being in the direction of the player facing.
+				-- the combination the other way round will be run through in a later loop iteration
+				if advtrains.yawToDirection(yaw, conn1, conn2) == conn1 then
+					-- does there exist a suitable double-connection rail?
+					--atdebug("Try double conn: ",conn1, conn2)
+					local node = g.double[conn1.."_"..conn2]
+					if node then
+						check_or_bend_rail(pos, conn1, pname, true)
+						check_or_bend_rail(pos, conn2, pname, true)
+						track_place_node(pos, node, nil, pname) -- calls after_place_node implicitly
+						return true
+					end
+				end
+			end
+		end
 	end
-	if s then
-		--	minetest.chat_send_all(nnprefix)
-		local yaw = placer:get_look_horizontal()
-		tp.placetrack(pos, nnprefix, placer, itemstack, pointed_thing, yaw)
-		if not minetest.is_creative_enabled(name) then
-			itemstack:take_item()
+	-- 3. try all possible one_endpoint connections
+	for k1, conn1 in ipairs(cand) do
+		-- select single1 or single2? depending on yaw
+		local single
+		if advtrains.yawToDirection(yaw, conn1, advtrains.oppd(conn1)) == conn1 then
+			single = g.single1
+		else
+			single = g.single2
+		end
+		--atdebug("Try single conn: ",conn1)
+		local node = single[conn1]
+		if node then
+			check_or_bend_rail(pos, conn1, pname, true)
+			track_place_node(pos, node, nil, pname) -- calls after_place_node implicitly
+			return true
 		end
 	end
-	return itemstack, true
+	-- 4. if nothing worked, set the default
+	local node = g.default
+	track_place_node(pos, node, nil, pname) -- calls after_place_node implicitly
+	return true
 end
 
-function tp.register_track_placer(nnprefix, imgprefix, dispname, def)
-	minetest.register_craftitem(":"..nnprefix.."_placer",{
-		description = dispname,
-		inventory_image = imgprefix.."_placer.png",
-		wield_image = imgprefix.."_placer.png",
-		groups={advtrains_trackplacer=1, digtron_on_place=1},
-		liquids_pointable = def.liquids_pointable,
-		on_place = function(itemstack, placer, pointed_thing)
-			return on_place(itemstack, placer, pointed_thing, nnprefix, def)
-		end,
-	})
-end
 
+-- TRACK WORKER --
 
 
 minetest.register_craftitem("advtrains:trackworker",{
-	description = attrans("Track Worker Tool\n\nLeft-click: change rail type (straight/curve/switch)\nRight-click: rotate rail/bumper/signal/etc."),
+	description = attrans("Track Worker Tool\n\nLeft-click: change rail type (straight/curve/switch)\nRight-click: rotate object"),
 	groups = {cracky=1}, -- key=name, value=rating; rating=1..3.
 	inventory_image = "advtrains_trackworker.png",
 	wield_image = "advtrains_trackworker.png",
 	stack_max = 1,
 	on_place = function(itemstack, placer, pointed_thing)
-			local name = placer:get_player_name()
-			if not name then
+		local name = placer:get_player_name()
+		if not name then
+			return
+		end
+		local has_aux1_down = placer:get_player_control().aux1
+		if pointed_thing.type=="node" then
+			local pos=pointed_thing.under
+			if not advtrains.check_track_protection(pos, name) then
 				return
 			end
-			local has_aux1_down = placer:get_player_control().aux1
-			if pointed_thing.type=="node" then
-				local pos=pointed_thing.under
-				if not advtrains.check_track_protection(pos, name) then
-					return
-				end
-				local node=minetest.get_node(pos)
+			local node=minetest.get_node(pos)
 
-				--if not advtrains.is_track_and_drives_on(minetest.get_node(pos).name, advtrains.all_tracktypes) then return end
-				
-				local nnprefix, suffix, rotation=string.match(node.name, "^(.+)_([^_]+)(_[^_]+)$")
-				--atdebug(node.name.."\npattern recognizes:"..nnprefix.." / "..suffix.." / "..rotation)
-				--atdebug("nntab: ",tp.tracks[nnprefix])
-				if not tp.tracks[nnprefix] or not tp.tracks[nnprefix].twrotate[suffix] then
-					nnprefix, suffix=string.match(node.name, "^(.+)_([^_]+)$")
-					rotation = ""
-					if not tp.tracks[nnprefix] or not tp.tracks[nnprefix].twrotate[suffix] then
-						minetest.chat_send_player(placer:get_player_name(), attrans("This node can't be rotated using the trackworker!"))
-						return
-					end
-				end
-				
-				-- check if the node is modify-protected
-				if advtrains.is_track_and_drives_on(minetest.get_node(pos).name, advtrains.all_tracktypes) then
-					-- is a track, we can query
-					local can_modify, reason = advtrains.can_dig_or_modify_track(pos)
-					if not can_modify then
-						local str = attrans("This track can not be rotated!")
-						if reason then
-							str = str .. " " .. reason
-						end
-						minetest.chat_send_player(placer:get_player_name(), str)
-						return
+			-- New since 2.5: only the fields in the node definition are considered, no more hacky pattern matching on the nodename
+			
+			local ndef = minetest.registered_nodes[node.name]
+			
+			if not ndef.advtrains or not ndef.advtrains.trackworker_next_rot then
+				minetest.chat_send_player(placer:get_player_name(), attrans("This node can't be rotated using the trackworker!"))
+				return
+			end
+			
+			-- check if the node is modify-protected
+			if advtrains.is_track(node.name) then
+				-- is a track, we can query
+				local can_modify, reason = advtrains.can_dig_or_modify_track(pos)
+				if not can_modify then
+					local str = attrans("This track can not be rotated!")
+					if reason then
+						str = str .. " " .. reason
 					end
-				end
-				
-				if has_aux1_down then
-					--feature: flip the node by 180°
-					--i've always wanted this!
-					advtrains.ndb.swap_node(pos, {name=node.name, param2=(node.param2+2)%4})
+					minetest.chat_send_player(placer:get_player_name(), str)
 					return
 				end
-				
-				local modext=tp.tracks[nnprefix].twrotate[suffix]
-
-				if rotation==modext[#modext] then --increase param2
-					advtrains.ndb.swap_node(pos, {name=nnprefix.."_"..suffix..modext[1], param2=(node.param2+1)%4})
-					return
-				else
-					local modpos
-					for k,v in pairs(modext) do
-						if v==rotation then modpos=k end
-					end
-					if not modpos then
-						minetest.chat_send_player(placer:get_player_name(), attrans("This node can't be rotated using the trackworker!"))
-						return
-					end
-					advtrains.ndb.swap_node(pos, {name=nnprefix.."_"..suffix..modext[modpos+1], param2=node.param2})
-				end
 			end
+			
+			if has_aux1_down then
+				--feature: flip the node by 180°
+				--i've always wanted this!
+				advtrains.ndb.swap_node(pos, {name=node.name, param2=(node.param2+2)%4})
+				return
+			end
+			
+			local new_node = {name = ndef.advtrains.trackworker_next_rot, param2 = node.param2}
+			if ndef.advtrains.trackworker_rot_incr_param2 then
+				new_node.param2 = ((node.param2 + 1) % 4)
+			end
+			advtrains.ndb.swap_node(pos, new_node)
+		end
 	end,
-	on_use=function(itemstack, user, pointed_thing)
-				local name = user:get_player_name()
-			if not name then
-			   return
+	on_use=function(itemstack, player, pointed_thing)
+		local name = player:get_player_name()
+		if not name then
+		   return
+		end
+		if pointed_thing.type=="node" then
+			local pos=pointed_thing.under
+			local node=minetest.get_node(pos)
+			if not advtrains.check_track_protection(pos, name) then
+				return
 			end
-			if pointed_thing.type=="node" then
-				local pos=pointed_thing.under
-				local node=minetest.get_node(pos)
-				if not advtrains.check_track_protection(pos, name) then
-					return
-				end
-				
-				--if not advtrains.is_track_and_drives_on(minetest.get_node(pos).name, advtrains.all_tracktypes) then return end
-				if advtrains.get_train_at_pos(pos) then return end
-				local nnprefix, suffix, rotation=string.match(node.name, "^(.+)_([^_]+)(_[^_]+)$")
-				--atdebug(node.name.."\npattern recognizes:"..nodeprefix.." / "..railtype.." / "..rotation)
-				if not tp.tracks[nnprefix] or not tp.tracks[nnprefix].twcycle[suffix] then
-				  nnprefix, suffix=string.match(node.name, "^(.+)_([^_]+)$")
-				  rotation = ""
-				  if not tp.tracks[nnprefix] or not tp.tracks[nnprefix].twcycle[suffix] then
-					minetest.chat_send_player(user:get_player_name(), attrans("This node can't be changed using the trackworker!"))
-					return
-				  end
-				end
-				
-				-- check if the node is modify-protected
-				if advtrains.is_track_and_drives_on(minetest.get_node(pos).name, advtrains.all_tracktypes) then
-					-- is a track, we can query
-					local can_modify, reason = advtrains.can_dig_or_modify_track(pos)
-					if not can_modify then
-						local str = attrans("This track can not be changed!")
-						if reason then
-							str = str .. " " .. reason
-						end
-						minetest.chat_send_player(user:get_player_name(), str)
-						return
+			
+			-- New since 2.5: only the fields in the node definition are considered, no more hacky pattern matching on the nodename
+			
+			local ndef = minetest.registered_nodes[node.name]
+			
+			if not ndef.advtrains or not ndef.advtrains.trackworker_next_var then
+				minetest.chat_send_player(name, attrans("This node can't be changed using the trackworker!"))
+				return
+			end
+			
+			-- check if the node is modify-protected
+			if advtrains.is_track(node.name) then
+				-- is a track, we can query
+				local can_modify, reason = advtrains.can_dig_or_modify_track(pos)
+				if not can_modify then
+					local str = attrans("This track can not be rotated!")
+					if reason then
+						str = str .. " " .. reason
 					end
+					minetest.chat_send_player(name, str)
+					return
 				end
-				
-				local nextsuffix=tp.tracks[nnprefix].twcycle[suffix]
-				advtrains.ndb.swap_node(pos, {name=nnprefix.."_"..nextsuffix..rotation, param2=node.param2})
-				
-			else
-				atprint(name, dump(tp.tracks))
 			end
+			
+			local new_node = {name = ndef.advtrains.trackworker_next_var, param2 = node.param2}
+			advtrains.ndb.swap_node(pos, new_node)
+		end
 	end,
 })
 
diff --git a/advtrains/tracks.lua b/advtrains/tracks.lua
index 3acde74..dba0d7a 100644
--- a/advtrains/tracks.lua
+++ b/advtrains/tracks.lua
@@ -1,484 +1,128 @@
---advtrains by orwell96, see readme.txt
+-- tracks.lua
+-- rewritten with advtrains 2.5 according to new track registration system
 
---dev-time settings:
---EDIT HERE
---If the old non-model rails on straight tracks should be replaced by the new...
---false: no
---true: yes
-advtrains.register_replacement_lbms=false
 
---[[TracksDefinition
-nodename_prefix
-texture_prefix
-description
-common={}
-straight={}
-straight45={}
-curve={}
-curve45={}
-lswitchst={}
-lswitchst45={}
-rswitchst={}
-rswitchst45={}
-lswitchcr={}
-lswitchcr45={}
-rswitchcr={}
-rswitchcr45={}
-vert1={
-	--you'll probably want to override mesh here
-}
-vert2={
-	--you'll probably want to override mesh here
-}
-]]--
-advtrains.all_tracktypes={}
+--[[
 
---definition preparation
-local function conns(c1, c2, r1, r2) return {{c=c1, y=r1}, {c=c2, y=r2}} end
-local function conns3(c1, c2, c3, r1, r2, r3) return {{c=c1, y=r1}, {c=c2, y=r2}, {c=c3, y=r3}} end
+Tracks in advtrains are defined by the node definition. They must have at least 2 connections, but can have any number.
+Switchable nodes (turnouts, single/double-slip switches) are implemented by having a separate node (node name) for each of the possible states.
 
-advtrains.ap={}
-advtrains.ap.t_30deg_flat={
-	regstep=1,
-	variant={
-		st={
-			conns = conns(0,8),
-			desc = "straight",
-			tpdouble = true,
-			tpsingle = true,
-			trackworker = "cr",
-		},
-		cr={
-			conns = conns(0,7),
-			desc = "curve",
-			tpdouble = true,
-			trackworker = "swlst",
-		},
-		swlst={
-			conns = conns3(0,8,7),
-			desc = "left switch (straight)",
-			trackworker = "swrst",
-			switchalt = "cr",
-			switchmc = "on",
-			switchst = "st",
-			switchprefix = "swl",
-		},
-		swlcr={
-			conns = conns3(0,7,8),
-			desc = "left switch (curve)",
-			trackworker = "swrcr",
-			switchalt = "st",
-			switchmc = "off",
-			switchst = "cr",
-			switchprefix = "swl",
-		},
-		swrst={
-			conns = conns3(0,8,9),
-			desc = "right switch (straight)",
-			trackworker = "st",
-			switchalt = "cr",
-			switchmc = "on",
-			switchst = "st",
-			switchprefix = "swr",
-		},
-		swrcr={
-			conns = conns3(0,9,8),
-			desc = "right switch (curve)",
-			trackworker = "st",
-			switchalt = "st",
-			switchmc = "off",
-			switchst = "cr",
-			switchprefix = "swr",
-		},
-	},
-	regtp=true,
-	tpdefault="st",
-	trackworker={
-		["swrcr"]="st",
-		["swrst"]="st",
-		["cr"]="swlst",
-		["swlcr"]="swrcr",
-		["swlst"]="swrst",
-	},
-	rotation={"", "_30", "_45", "_60"},
-}
-advtrains.ap.t_yturnout={
-	regstep=1,
-	variant={
-		l={
-			conns = conns3(0,7,9),
-			desc = "Y-turnout (left)",
-			switchalt = "r",
-			switchmc = "off",
-			switchst = "l",
-			switchprefix = "",
-		},
-		r={
-			conns = conns3(0,9,7),
-			desc = "Y-turnout (right)",
-			switchalt = "l",
-			switchmc = "on",
-			switchst = "r",
-			switchprefix = "",
-		}
+	minetest.register_node(nodename, {
+	... usual node definition ...
+	groups = {
+		advtrains_track = 1,
+		advtrains_track_<tracktype>=1
+		^- these groups tell that the node is a track
+		not_blocking_trains=1,
+		^- this group tells that the node should not block trains although it's walkable.
 	},
-	regtp=true,
-	tpdefault="l",
-	rotation={"", "_30", "_45", "_60"},
-}
-advtrains.ap.t_s3way={
-	regstep=1,
-	variant={
-		l={
-			conns = { {c=0}, {c=7}, {c=8}, {c=9}, {c=0} },
-			desc = "3-way turnout (left)",
-			switchalt = "s",
-			switchst="l",
-			switchprefix = "",
-		},
-		s={
-			conns = { {c=0}, {c=8}, {c=7}, {c=9}, {c=0} },
-			desc = "3-way turnout (straight)",
-			switchalt ="r",
-			switchst = "s",
-			switchprefix = "",
-		},
-		r={
-			conns = { {c=0}, {c=9}, {c=8}, {c=7}, {c=0} },
-			desc = "3-way turnout (right)",
-			switchalt = "l",
-			switchst="r",
-			switchprefix = "",
+	
+	at_rail_y = 0,
+	^- Height of this rail node (the y position of a wagon that stands centered on this rail)
+	at_conns = {
+		  [1] = { c=0..15, y=0..1 },
+		  [2] = { c=0..15, y=0..1 },
+		( [3] = { c=0..15, y=0..1 }, )
+		( [4] = { c=0..15, y=0..1 }, )
+		( ... )
+	}
+	^- Connections of this rail. There are two general cases:
+	   a) SIMPLE TRACK - the track has exactly 2 connections, and does not feature a turnout, crossing or other contraption
+	      For simple tracks, except for the at_conns table no further setup needs to be specified. A train entering on conn 1 will go out at conn 2 and vice versa.
+		  A track with only one connection defined is not permitted.
+	   b) COMPOUND TRACK - the track has more than 2 connections
+	      This will be used for turnouts and crossings. Tracks with more than 2 conns MUST define 'at_conn_map'.
+		  Switchable nodes, whose state can be changed (e.g. turnouts) MUST define a 'state_map' within the advtrains table as well.
+		  This differs from the behavior up until 2.4.2, where the conn mapping was fixed.
+	^- Connection definition:
+	   - c is the direction of the connection (0-16). For the mapping to world directions see helpers.lua.
+	   - Connections will be auto-rotated with param2 of the node (horizontal, param2 values 0-3 only)
+	   - y is the height of the connection (rail will only connect when this matches)
+	^- The index of a connection inside the conns table (1, 2, 3, ...) is referred throughout advtrains code as 'connid'
+	^- IMPORTANT: For switchable nodes (any kind of turnout), it is crucial that for all of the node's variants the at_conns table stays the same. See below.
+	   
+	at_conn_map = {
+		[1] = 2,
+		[2] = 1,
+		[3] = 1,
+	}
+	^- Connection map of this rail. It specifies when a train enters the track on connid X, on which connid it will leave
+	   This field MUST be specified when the number of connections in at_conns is greater than 2
+	   This field may, and obviously will, vary between nodes for switchable nodes.
+	
+	can_dig = advtrains.track_can_dig_callback
+	after_dig_node = advtrains.track_update_callback
+	after_place_node = advtrains.track_update_callback
+	^- the code in these 3 default minetest API functions is required for advtrains to work, however you can add your own code
+	
+	on_rightclick = advtrains.state_node_on_rightclick_callback
+	^- Must be added if the node is a turnout and if it should be switched by right-click. It will cause the turnout to be switched to next_state.
+	
+	advtrains = {
+		on_train_enter=function(pos, train_id, train, index) end
+		^- called when a train enters the rail
+		on_train_leave=function(pos, train_id, train, index) end
+		^- called when a train leaves the rail
+		
+		-- The following function is only in effect when interlocking is enabled:
+		on_train_approach = function(pos, train_id, train, index, has_entered, lzbdata)
+		^- called when a train is approaching this position, called exactly once for every path recalculation (which can happen at any time)
+		^- This is called so that if the train would start braking now, it would come to halt about(wide approx) 5 nodes before the rail.
+		^- has_entered: when true, the train is already standing on this node with its front tip, and the enter callback has already been called.
+		   Possibly, some actions need not to be taken in this case. Only set if it's the very first node the train is standing on.
+		^- lzbdata should be ignored and nothing should be assigned to it
+		
+		-- The following information is required if the node is a turnout (e.g. can be switched into different positions)
+		node_state = "st"
+		^- The name of the state this node represents
+		^- Conventions for this field are as follows:
+		   - Two-way straight/turn switches: 'st'=straight branch, 'cr'=diverting/turn branch
+		   - 3-way turnouts, Y-turnouts: 'l'=left branch, 's'=straight branch, 'r'=right branch
+		   
+		node_next_state = "cr"
+		^- The name of the state that the turnout should be switched to when it is right-clicked
+		
+		node_fallback_state = "st"
+		^- The name of the state that the turnout should "fall back" to when it is released
+		   Only used by the interlocking system, when a route on the node is released it is switched back to this state.
+		
+		node_state_map = {
+			["st"] = "<node name of the st variant>",
+			["cr"] = "<node name of the cr variant>",
+			... etc ...
 		}
-	},
-	regtp=true,
-	tpdefault="l",
-	rotation={"", "_30", "_45", "_60"},
-}
-advtrains.ap.t_30deg_slope={
-	regstep=1,
-	variant={
-		vst1={conns = conns(8,0,0,0.5), rail_y = 0.25, desc = "steep uphill 1/2", slope=true},
-		vst2={conns = conns(8,0,0.5,1), rail_y = 0.75, desc = "steep uphill 2/2", slope=true},
-		vst31={conns = conns(8,0,0,0.33), rail_y = 0.16, desc = "uphill 1/3", slope=true},
-		vst32={conns = conns(8,0,0.33,0.66), rail_y = 0.5, desc = "uphill 2/3", slope=true},
-		vst33={conns = conns(8,0,0.66,1), rail_y = 0.83, desc = "uphill 3/3", slope=true},
-		vst41={conns = conns(8,0,0,1/4), rail_y = 1/4 - 1/8, desc = "uphill 1/4", slope=true},
-		vst42={conns = conns(8,0,1/4,2/4), rail_y = 2/4 - 1/8, desc = "uphill 2/4", slope=true},
-		vst43={conns = conns(8,0,2/4,3/4), rail_y = 3/4 - 1/8, desc = "uphill 3/4", slope=true},
-		vst44={conns = conns(8,0,3/4,1), rail_y = 1 - 1/8, desc = "uphill 4/4", slope=true},
-		vst51={conns = conns(8,0,0,1/5), rail_y = 1/5 - 1/10, desc = "uphill 1/5", slope=true},
-		vst52={conns = conns(8,0,1/5,2/5), rail_y = 2/5 - 1/10, desc = "uphill 2/5", slope=true},
-		vst53={conns = conns(8,0,2/5,3/5), rail_y = 3/5 - 1/10, desc = "uphill 3/5", slope=true},
-		vst54={conns = conns(8,0,3/5,4/5), rail_y = 4/5 - 1/10, desc = "uphill 4/5", slope=true},
-		vst55={conns = conns(8,0,4/5,1), rail_y = 5/5 - 1/10, desc = "uphill 5/5", slope=true},
-		vst61={conns = conns(8,0,0,1/6), rail_y = 1/6 - 1/12, desc = "uphill 1/6", slope=true},
-		vst62={conns = conns(8,0,1/6,2/6), rail_y = 2/6 - 1/12, desc = "uphill 2/6", slope=true},
-		vst63={conns = conns(8,0,2/6,3/6), rail_y = 3/6 - 1/12, desc = "uphill 3/6", slope=true},
-		vst64={conns = conns(8,0,3/6,4/6), rail_y = 4/6 - 1/12, desc = "uphill 4/6", slope=true},
-		vst65={conns = conns(8,0,4/6,5/6), rail_y = 5/6 - 1/12, desc = "uphill 5/6", slope=true},
-		vst66={conns = conns(8,0,5/6,1), rail_y = 6/6 - 1/12, desc = "uphill 6/6", slope=true},
-		vst71={conns = conns(8,0,0,1/7), rail_y = 1/7 - 1/14, desc = "uphill 1/7", slope=true},
-		vst72={conns = conns(8,0,1/7,2/7), rail_y = 2/7 - 1/14, desc = "uphill 2/7", slope=true},
-		vst73={conns = conns(8,0,2/7,3/7), rail_y = 3/7 - 1/14, desc = "uphill 3/7", slope=true},
-		vst74={conns = conns(8,0,3/7,4/7), rail_y = 4/7 - 1/14, desc = "uphill 4/7", slope=true},
-		vst75={conns = conns(8,0,4/7,5/7), rail_y = 5/7 - 1/14, desc = "uphill 5/7", slope=true},
-		vst76={conns = conns(8,0,5/7,6/7), rail_y = 6/7 - 1/14, desc = "uphill 6/7", slope=true},
-		vst77={conns = conns(8,0,6/7,1), rail_y = 7/7 - 1/14, desc = "uphill 7/7", slope=true},
-		vst81={conns = conns(8,0,0,1/8), rail_y = 1/8 - 1/16, desc = "uphill 1/8", slope=true},
-		vst82={conns = conns(8,0,1/8,2/8), rail_y = 2/8 - 1/16, desc = "uphill 2/8", slope=true},
-		vst83={conns = conns(8,0,2/8,3/8), rail_y = 3/8 - 1/16, desc = "uphill 3/8", slope=true},
-		vst84={conns = conns(8,0,3/8,4/8), rail_y = 4/8 - 1/16, desc = "uphill 4/8", slope=true},
-		vst85={conns = conns(8,0,4/8,5/8), rail_y = 5/8 - 1/16, desc = "uphill 5/8", slope=true},
-		vst86={conns = conns(8,0,5/8,6/8), rail_y = 6/8 - 1/16, desc = "uphill 6/8", slope=true},
-		vst87={conns = conns(8,0,6/8,7/8), rail_y = 7/8 - 1/16, desc = "uphill 7/8", slope=true},
-		vst88={conns = conns(8,0,7/8,1), rail_y = 8/8 - 1/16, desc = "uphill 8/8", slope=true},
-	},
-	regsp=true,
-	slopeplacer={
-		[2]={"vst1", "vst2"},
-		[3]={"vst31", "vst32", "vst33"},
-		[4]={"vst41", "vst42", "vst43", "vst44"},
-		[5]={"vst51", "vst52", "vst53", "vst54", "vst55"},
-		[6]={"vst61", "vst62", "vst63", "vst64", "vst65", "vst66"},
-		[7]={"vst71", "vst72", "vst73", "vst74", "vst75", "vst76", "vst77"},
-		[8]={"vst81", "vst82", "vst83", "vst84", "vst85", "vst86", "vst87", "vst88"},
-		max=8,--highest entry
-	},
-	slopeplacer_45={
-		[2]={"vst1_45", "vst2_45"},
-		max=2,
-	},
-	rotation={"", "_30", "_45", "_60"},
-	trackworker={},
-	increativeinv={},
-}
-advtrains.ap.t_30deg_straightonly={
-	regstep=1,
-	variant={
-		st={
-			conns = conns(0,8),
-			desc = "straight",
-			tpdouble = true,
-			tpsingle = true,
-			trackworker = "st",
-		},
-	},
-	regtp=true,
-	tpdefault="st",
-	rotation={"", "_30", "_45", "_60"},
-}
-advtrains.ap.t_30deg_straightonly_noplacer={
-	regstep=1,
-	variant={
-		st={
-			conns = conns(0,8),
-			desc = "straight",
-			tpdouble = true,
-			tpsingle = true,
-			trackworker = "st",
-		},
-	},
-	tpdefault="st",
-	rotation={"", "_30", "_45", "_60"},
-}
-advtrains.ap.t_45deg={
-	regstep=2,
-	variant={
-		st={
-			conns = conns(0,8),
-			desc = "straight",
-			tpdouble = true,
-			tpsingle = true,
-			trackworker = "cr",
-		},
-		cr={
-			conns = conns(0,6),
-			desc = "curve",
-			tpdouble = true,
-			trackworker = "swlst",
-		},
-		swlst={
-			conns = conns3(0,8,6),
-			desc = "left switch (straight)",
-			trackworker = "swrst",
-			switchalt = "cr",
-			switchmc = "on",
-			switchst = "st",
-		},
-		swlcr={
-			conns = conns3(0,6,8),
-			desc = "left switch (curve)",
-			trackworker = "swrcr",
-			switchalt = "st",
-			switchmc = "off",
-			switchst = "cr",
-		},
-		swrst={
-			conns = conns3(0,8,10),
-			desc = "right switch (straight)",
-			trackworker = "st",
-			switchalt = "cr",
-			switchmc = "on",
-			switchst = "st",
-		},
-		swrcr={
-			conns = conns3(0,10,8),
-			desc = "right switch (curve)",
-			trackworker = "st",
-			switchalt = "st",
-			switchmc = "off",
-			switchst = "cr",
-		},
-	},
-	regtp=true,
-	tpdefault="st",
-	trackworker={
-		["swrcr"]="st",
-		["swrst"]="st",
-		["cr"]="swlst",
-		["swlcr"]="swrcr",
-		["swlst"]="swrst",
-	},
-	rotation={"", "_30", "_45", "_60"},
-}
-advtrains.ap.t_perpcrossing={
-	regstep = 1,
-	variant={
-		st={
-			conns = { {c=0}, {c=8}, {c=4}, {c=12} },
-			desc = "perpendicular crossing",
-			tpdouble = true,
-			tpsingle = true,
-			trackworker = "st",
-		},
-	},
-	regtp=true,
-	tpdefault="st",
-	rotation={"", "_30", "_45", "_60"},
-}
-advtrains.ap.t_90plusx_crossing={
-	regstep = 1,
-	variant={
-		["30l"]={
-			conns = { {c=0}, {c=8}, {c=1}, {c=9} },
-			desc = "30/90 degree crossing (left)",
-			tpdouble = true,
-			tpsingle = true,
-			trackworker = "45l"
-		},
-		["45l"]={
-			conns = { {c=0}, {c=8}, {c=2}, {c=10} },
-			desc = "45/90 degree crossing (left)",
-			tpdouble = true,
-			tpsingle = true,
-			trackworker = "60l",
-		},
-		["60l"]={
-			conns = { {c=0}, {c=8}, {c=3}, {c=11}},
-			desc = "60/90 degree crossing (left)",
-			tpdouble = true,
-			tpsingle = true,
-			trackworker = "60r",
-		},
-		["60r"]={
-			conns = { {c=0}, {c=8}, {c=5}, {c=13} },
-			desc = "60/90 degree crossing (right)",
-			tpdouble = true,
-			tpsingle = true,
-			trackworker = "45r"
-		},
-		["45r"]={
-			conns = { {c=0}, {c=8}, {c=6}, {c=14} },
-			desc = "45/90 degree crossing (right)",
-			tpdouble = true,
-			tpsingle = true,
-			trackworker = "30r",
-		},
-		["30r"]={
-			conns = { {c=0}, {c=8}, {c=7}, {c=15}},
-			desc = "30/90 degree crossing (right)",
-			tpdouble = true,
-			tpsingle = true,
-			trackworker = "30l",
-		},
-	},
-	regtp=true,
-	tpdefault="30l",
-	rotation={""},
-	trackworker = {
-		["30l"] = "45l",
-		["45l"] = "60l",
-		["60l"] = "60r",
-		["60r"] = "45r",
-		["45r"] = "30r",
-		["30r"] = "30l",
+		^- Map of state name to the appropriate node name that should be set by advtrains when a switch is requested
+		   Note that for all of those nodes, the at_conns table must be identical (however the conn_map will vary)
+		   
+		node_on_switch_state = function(pos, node, oldstate, newstate)
+		^- Called when the node state is switched by advtrains, after the node replacement has commenced.
+		
+		Turnout switching can happen programmatically via advtrains.setstate(pos, state), via user right_click or via the interlocking system.
+		In no other situation is it permissible to exchange track nodes in-place, unless both at_conns and at_conn_map stay identical.
+		
+		Note that the fields node_state, node_next_state and node_state_map completely replace the getstate/setstate functions.
+		There must be a one-to-one mapping between states and node names and no function can be defined for state switching.
+		This principle enables the seamless working of the interlocking autorouter and reduces failure points.
+		The node_state_* system can also be used as drop-in replacement for the passive-API-enabled nodes (andrews-cross, mesecon_switch etc.)
+		The advtrains API functions advtrains.getstate() and advtrains.setstate() remain the programmatic access points, but will now utilize the new state system.
+		
+		
+		trackworker_next_rot = <nodename of next rotation step>,
+		^- if set, right-click with trackworker will set this node
+		trackworker_rot_incr_param2 = true
+		^- if set, trackworker will increase node param2 on rightclick
+		
+		trackworker_next_var = <nodename of next variant>
+		^- if set, left-click with trackworker will set this node
 	}
-}
-
-advtrains.ap.t_diagonalcrossing = {
-	regstep=1,
-	variant={
-		["30l45r"]={
-			conns = {{c=1}, {c=9}, {c=6}, {c=14}},
-			desc = "30left-45right diagonal crossing",
-			tpdouble=true,
-			tpsingle=true,
-			trackworker="60l30l",
-		},
-		["60l30l"]={
-			conns = {{c=3}, {c=11}, {c=1}, {c=9}},
-			desc = "30left-60right diagonal crossing",
-			tpdouble=true,
-			tpsingle=true,
-			trackworker="60l45r"
-		},
-		["60l45r"]={
-			conns = {{c=3}, {c=11}, {c=6}, {c=14}},
-			desc = "60left-45right diagonal crossing",
-			tpdouble=true,
-			tpsingle=true,
-			trackworker="60l60r"
-		},
-		["60l60r"]={
-			conns = {{c=3}, {c=11}, {c=5}, {c=13}},
-			desc = "60left-60right diagonal crossing",
-			tpdouble=true,
-			tpsingle=true,
-			trackworker="60r45l",
-		},
-		--If 60l60r had a mirror image, it would be here, but it's symmetric.
-		-- 60l60r is also equivalent to 30l30r but rotated 90 degrees.
-		["60r45l"]={
-			conns = {{c=5}, {c=13}, {c=2}, {c=10}},
-			desc = "60right-45left diagonal crossing",
-			tpdouble=true,
-			tpsingle=true,
-			trackworker="60r30r",
-		},
-		["60r30r"]={
-			conns = {{c=5}, {c=13}, {c=7}, {c=15}},
-			desc = "60right-30right diagonal crossing",
-			tpdouble=true,
-			tpsingle=true,
-			trackworker="30r45l",
-		},
-		["30r45l"]={
-			conns = {{c=7}, {c=15}, {c=2}, {c=10}},
-			desc = "30right-45left diagonal crossing",
-			tpdouble=true,
-			tpsingle=true,
-			trackworker="30l45r",
-		},
+	})
 
-	},
-	regtp=true,
-	tpdefault="30l45r",
-	rotation={""},
-	trackworker = {
-		["30l45r"] = "60l30l",
-		["60l30l"] = "60l45r",
-		["60l45r"] = "60l60r",
-		["60l60r"] = "60r45l",
-		["60r45l"] = "60r30r",
-		["60r30r"] = "30r45l",
-		["30r45l"] = "30l45r",
-	}
-}
+]]--
 
-advtrains.trackpresets = advtrains.ap
+-- This file provides some utilities to register tracks, but tries to not get into the way too much
 
---definition format: ([] optional)
---[[{
-	nodename_prefix
-	texture_prefix
-	[shared_texture]
-	models_prefix
-	models_suffix (with dot)
-	[shared_model]
-	formats={
-		st,cr,swlst,swlcr,swrst,swrcr,vst1,vst2
-		(each a table with indices 0-3, for if to register a rail with this 'rotation' table entry. nil is assumed as 'all', set {} to not register at all)
-	}
-	common={} change something on common rail appearance
-}
-[18.12.17] Note on new connection system:
-In order to support real rail crossing nodes and finally make the trackplacer respect switches, I changed the connection system.
-There can be a variable number of connections available. These are specified as tuples {c=<connection>, y=<rely>}
-The table "at_conns" consists of {<conn1>, <conn2>...}
-the "at_rail_y" property holds the value that was previously called "railheight"
-Depending on the number of connections:
-2 conns: regular rail
-3 conns: switch:
-	- when train passes in at conn1, will move out of conn2
-	- when train passes in at conn2 or conn3, will move out of conn1
-4 conns: cross (or cross switch, depending on arrangement of conns):
-	- conn1 <> conn2
-	- conn3 <> conn4
-]]
 
--- Notify the user if digging the rail is not allowed
-local function can_dig_callback(pos, player)
+function advtrains.track_can_dig_callback(pos, player)
 	local ok, reason = advtrains.can_dig_or_modify_track(pos)
 	if not ok and player then
 		minetest.chat_send_player(player:get_player_name(), attrans("This track can not be removed!") .. " " .. reason)
@@ -486,148 +130,113 @@ local function can_dig_callback(pos, player)
 	return ok
 end
 
-function advtrains.register_tracks(tracktype, def, preset)
-	advtrains.trackplacer.register_tracktype(def.nodename_prefix, preset.tpdefault)
-	if preset.regtp then
-		advtrains.trackplacer.register_track_placer(def.nodename_prefix, def.texture_prefix, def.description, def)			
-	end
-	if preset.regsp then
-		advtrains.slope.register_placer(def, preset)			
-	end
-	for suffix, var in pairs(preset.variant) do
-		for rotid, rotation in ipairs(preset.rotation) do
-			if not def.formats[suffix] or def.formats[suffix][rotid] then
-				local img_suffix = suffix..rotation
-				local ndef = advtrains.merge_tables({
-					description=def.description.."("..(var.desc or "any")..rotation..")",
-					drawtype = "mesh",
-					paramtype="light",
-					paramtype2="facedir",
-					walkable = false,
-					selection_box = {
-						type = "fixed",
-						fixed = {-1/2, -1/2, -1/2, 1/2, -1/2+1/16, 1/2},
-					},
-					
-					mesh = def.shared_model or (def.models_prefix.."_"..img_suffix..def.models_suffix),
-					tiles = {def.shared_texture or (def.texture_prefix.."_"..img_suffix..".png"), def.second_texture},
-					use_texture_alpha = "clip",
+function advtrains.track_update_callback(pos)
+	advtrains.ndb.update(pos)
+end
 
-					groups = {
-						attached_node = advtrains.IGNORE_WORLD and 0 or 1,
-						advtrains_track=1,
-						["advtrains_track_"..tracktype]=1,
-						save_in_at_nodedb=1,
-						dig_immediate=2,
-						not_in_creative_inventory=1,
-						not_blocking_trains=1,
-					},
-						
-					can_dig = can_dig_callback,
-					after_dig_node=function(pos)
-						advtrains.ndb.update(pos)
-					end,
-					after_place_node=function(pos)
-						advtrains.ndb.update(pos)
-					end,
-					at_nnpref = def.nodename_prefix,
-					at_suffix = suffix,
-					at_rotation = rotation,
-					at_rail_y = var.rail_y
-				}, def.common or {})
-				
-				if preset.regtp then
-					ndef.drop = def.nodename_prefix.."_placer"
-				end
-				if preset.regsp and var.slope then
-					ndef.drop = def.nodename_prefix.."_slopeplacer"
-				end
-				
-				--connections
-				ndef.at_conns = advtrains.rotate_conn_by(var.conns, (rotid-1)*preset.regstep)
-				
-				local ndef_avt_table
-				
-				if var.switchalt and var.switchst then
-					local switchfunc=function(pos, node, newstate)
-						newstate = newstate or var.switchalt -- support for 3 (or more) state switches
-						-- this code is only called from the internal setstate function, which
-						-- ensures that it is safe to switch the turnout
-						if newstate~=var.switchst then
-							advtrains.ndb.swap_node(pos, {name=def.nodename_prefix.."_"..(var.switchprefix or "")..newstate..rotation, param2=node.param2})
-							advtrains.invalidate_all_paths(pos)
-						end
-					end
-					ndef.on_rightclick = function(pos, node, player)
-						if advtrains.check_turnout_signal_protection(pos, player:get_player_name()) then
-							advtrains.setstate(pos, nil, node)
-							advtrains.log("Switch", player:get_player_name(), pos)
-						end
-					end
-					if var.switchmc then
-						ndef.mesecons = {effector = {
-							["action_"..var.switchmc] = function(pos, node) 
-								advtrains.setstate(pos, nil, node)
-							end,
-							rules=advtrains.meseconrules
-						}}
-					end
-					ndef_avt_table = {
-						getstate = var.switchst,
-						setstate = switchfunc,
-					}
-				end
-				
-				local adef={}
-				if def.get_additional_definiton then
-					adef=def.get_additional_definiton(def, preset, suffix, rotation)
-				end
-				ndef = advtrains.merge_tables(ndef, adef)
-				
-				-- insert getstate/setstate functions after merging the additional definitions
-				if ndef_avt_table then
-					ndef.advtrains = advtrains.merge_tables(ndef.advtrains or {}, ndef_avt_table)
-				end
+function advtrains.state_node_on_rightclick_callback(pos, node, player)
+	if advtrains.check_turnout_signal_protection(pos, player:get_player_name()) then
+		local ndef = minetest.registered_nodes[node.name]
+		if ndef and ndef.advtrains and ndef.advtrains.node_next_state then
+			advtrains.setstate(pos, ndef.advtrains.node_next_state, node)
+			advtrains.log("Switch", player:get_player_name(), pos)
+		end
+	end
+end
 
-				minetest.register_node(":"..def.nodename_prefix.."_"..suffix..rotation, ndef)
-				--trackplacer
-				if preset.regtp then
-					local tpconns = {conn1=ndef.at_conns[1].c, conn2=ndef.at_conns[2].c}
-					if var.tpdouble then
-						advtrains.trackplacer.add_double_conn(def.nodename_prefix, suffix, rotation, tpconns)
-					end
-					if var.tpsingle then
-						advtrains.trackplacer.add_single_conn(def.nodename_prefix, suffix, rotation, tpconns)
-					end
+-- advtrains.register_node_4rot(name, nodedef)
+-- Registers four rotations for the node defined by nodedef (0°, 30°, 45° and 60°; the 4 90°-steps are already handled by the param2, resulting in 16 directions total).
+-- You must provide the definition for the base node, and certain fields are altered automatically for the 3 additional rotations:
+--  name: appends the suffix "_30", "_45" or "_60"
+--  description: appends the rotation (human-readable) in parenthesis
+--  tiles_prefix: if defined, "tiles" field will be set as prefix..rotationExtension..".png"
+--  mesh_prefix, mesh_suffix: if defined, "mesh" field will be set as prefix..rotationExtension..suffix
+--  at_conns: are rotated according to the node rotation
+--  node_state_map, trackworker_next_var: appends the suffix appropriately.
+--  groups: applies save_in_at_nodedb and not_blocking_trains groups if not already present
+-- The nodes are registered in the trackworker to be rotated with right-click.
+-- definition_mangling_function is an optional parameter. For each of the 4 rotations, it gets passed the modified node definition and may perform final modifications to it.
+--  signature: function definition_mangling_function(name, nodedef, rotationIndex, rotationSuffix)
+--  Example usage: define the setstate function of turnouts (if that is not done via the "automatic" way of state_node_map)
+local rotations = {
+	{i = 0, s = "",    h = " (0)",  n = "_30"},
+	{i = 1, s = "_30", h = " (30)", n = "_45"},
+	{i = 2, s = "_45", h = " (45)", n = "_60"},
+	{i = 3, s = "_60", h = " (60)", n = ""},
+}
+function advtrains.register_node_4rot(ori_name, ori_ndef, definition_mangling_function)
+	for _, rot in ipairs(rotations) do
+		local ndef = table.copy(ori_ndef)
+		if ori_ndef.advtrains then
+			-- make sure advtrains table is deep-copied because we may need to replace node_state_map
+			ndef.advtrains = table.copy(ori_ndef.advtrains)
+		else
+			ndef.advtrains = {} -- we need the table later for trackworker
+		end
+		-- Perform the name mangling
+		local suffix = rot.s
+		local name = ori_name..suffix
+		ndef.description = ori_ndef.description .. rot.h
+		if ori_ndef.tiles_prefix then
+			ndef.tiles = { ori_ndef.tiles_prefix .. suffix .. ".png" }
+		end
+		if ori_ndef.mesh_prefix then
+			ndef.mesh = ori_ndef.mesh_prefix .. suffix .. ori_ndef.mesh_suffix
+		end
+		-- rotate connections
+		if ori_ndef.at_conns then
+			ndef.at_conns = advtrains.rotate_conn_by(ori_ndef.at_conns, rot.i)
+		end
+		-- update node state map if present
+		if ori_ndef.advtrains then
+			if ori_ndef.advtrains.node_state_map then
+				local new_nsm = {}
+				for state, nname in pairs(ori_ndef.advtrains.node_state_map) do
+					new_nsm[state] = nname .. suffix
 				end
-				advtrains.trackplacer.add_worked(def.nodename_prefix, suffix, rotation, var.trackworker)
+				ndef.advtrains.node_state_map = new_nsm
 			end
+			if ori_ndef.advtrains.trackworker_next_var then
+				ndef.advtrains.trackworker_next_var = ori_ndef.advtrains.trackworker_next_var .. suffix
+			end
+			-- apply trackworker rot field
+			ndef.advtrains.trackworker_next_rot = ori_name .. rot.n
+			ndef.advtrains.trackworker_rot_incr_param2 = (rot.n=="")
+		end
+		-- apply groups
+		ndef.groups.save_in_at_nodedb = 1
+		ndef.groups.not_blocking_trains = 1
+		
+		-- give the definition mangling function an option to do some adjustments
+		if definition_mangling_function then
+			definition_mangling_function(name, ndef, rot.i, suffix)
+		end
+		
+		-- register node
+		minetest.register_node(":"..name, ndef)
+		
+		-- if this has the track_place_group set, register as a candidate for the track_place_group
+		if ndef.advtrains.track_place_group then
+			advtrains.trackplacer.register_candidate(ndef.advtrains.track_place_group, name, ndef, ndef.advtrains.track_place_single, true)
 		end
 	end
-	advtrains.all_tracktypes[tracktype]=true
 end
 
-function advtrains.is_track_and_drives_on(nodename, drives_on_p)
-	local drives_on = drives_on_p
-	if not drives_on then drives_on = advtrains.all_tracktypes end
-	local hasentry = false
-	for _,_ in pairs(drives_on) do
-		hasentry=true
-	end
-	if not hasentry then drives_on = advtrains.all_tracktypes end
-	
+-- track-related helper functions
+
+function advtrains.is_track(nodename)
 	if not minetest.registered_nodes[nodename] then
 		return false
 	end
 	local nodedef=minetest.registered_nodes[nodename]
-	for k,v in pairs(drives_on) do
-		if nodedef.groups["advtrains_track_"..k] then
-			return true
-		end
+	if nodedef and nodedef.groups.advtrains_track then
+		return true
 	end
 	return false
 end
 
+-- returns the connection tables of the track with given node details
+-- returns: conns table, railheight, conn_map table
 function advtrains.get_track_connections(name, param2)
 	local nodedef=minetest.registered_nodes[name]
 	if not nodedef then atprint(" get_track_connections couldn't find nodedef for nodename "..(name or "nil")) return nil end
@@ -635,18 +244,16 @@ function advtrains.get_track_connections(name, param2)
 	if not param2 then noderot=0 end
 	if noderot > 3 then atprint(" get_track_connections: rail has invaild param2 of "..noderot) noderot=0 end
 	
-	local tracktype
-	for k,_ in pairs(nodedef.groups) do
-		local tt=string.match(k, "^advtrains_track_(.+)$")
-		if tt then
-			tracktype=tt
-		end
+	if not nodedef.at_conns then
+		return nil
 	end
-	return advtrains.rotate_conn_by(nodedef.at_conns, noderot*AT_CMAX/4), (nodedef.at_rail_y or 0), tracktype
+	--atdebug("Track connections of ",name,param2,":",nodedef.at_conns)
+	return advtrains.rotate_conn_by(nodedef.at_conns, noderot*AT_CMAX/4), (nodedef.at_rail_y or 0), nodedef.at_conn_map
 end
 
 -- Function called when a track is about to be dug or modified by the trackworker
 -- Returns either true (ok) or false,"translated string describing reason why it isn't allowed"
+-- Impl Note: possibly duplicate code in "self contained TCB" - see interlocking/tcb_ts_ui.lua!
 function advtrains.can_dig_or_modify_track(pos)
 	if advtrains.get_train_at_pos(pos) then
 		return false, attrans("Position is occupied by a train.")
@@ -664,125 +271,3 @@ function advtrains.can_dig_or_modify_track(pos)
 	end
 	return true
 end
-
--- slope placer. Defined in register_tracks.
---crafted with rail and gravel
-local sl={}
-function sl.register_placer(def, preset)
-	minetest.register_craftitem(":"..def.nodename_prefix.."_slopeplacer",{
-		description = attrans("@1 Slope", def.description),
-		inventory_image = def.texture_prefix.."_slopeplacer.png",
-		wield_image = def.texture_prefix.."_slopeplacer.png",
-		groups={},
-		on_place = sl.create_slopeplacer_on_place(def, preset),
-		liquids_pointable = def.liquids_pointable,
-	})
-end
---(itemstack, placer, pointed_thing)
-function sl.create_slopeplacer_on_place(def, preset)
-	return function(istack, player, pt)
-		if not pt.type=="node" then 
-			minetest.chat_send_player(player:get_player_name(), attrans("Can't place: not pointing at node"))
-			return istack 
-		end
-		local pos=pt.above
-		if not pos then 
-			minetest.chat_send_player(player:get_player_name(), attrans("Can't place: not pointing at node"))
-			return istack
-		end
-		local node=minetest.get_node(pos)
-		if not minetest.registered_nodes[node.name] or not minetest.registered_nodes[node.name].buildable_to then
-			minetest.chat_send_player(player:get_player_name(), attrans("Can't place: space occupied!"))
-			return istack
-		end
-		if not advtrains.check_track_protection(pos, player:get_player_name()) then 
-			minetest.record_protection_violation(pos, player:get_player_name())
-			return istack
-		end
-		--determine player orientation (only horizontal component)
-		--get_look_horizontal may not be available
-		local yaw=player.get_look_horizontal and player:get_look_horizontal() or (player:get_look_yaw() - math.pi/2)
-		
-		--rounding unit vectors is a nice way for selecting 1 of 8 directions since sin(30°) is 0.5.
-		local dirvec={x=math.floor(math.sin(-yaw)+0.5), y=0, z=math.floor(math.cos(-yaw)+0.5)}
-		--translate to direction to look up inside the preset table
-		local param2, rot45=({
-			[-1]={
-				[-1]=2,
-				[0]=3,
-				[1]=3,
-				},
-			[0]={
-				[-1]=2,
-				[1]=0,
-				},
-			[1]={
-				[-1]=1,
-				[0]=1,
-				[1]=0,
-				},
-		})[dirvec.x][dirvec.z], dirvec.x~=0 and dirvec.z~=0
-		local lookup=preset.slopeplacer
-		if rot45 then lookup=preset.slopeplacer_45 end
-		
-		--go unitvector forward and look how far the next node is
-		local step=1
-		while step<=lookup.max do
-			local node=minetest.get_node(vector.add(pos, dirvec))
-			--next node solid?
-			if not minetest.registered_nodes[node.name] or not minetest.registered_nodes[node.name].buildable_to or advtrains.is_protected(pos, player:get_player_name()) then 
-				--do slopes of this distance exist?
-				if lookup[step] then
-					if minetest.is_creative_enabled(player:get_player_name()) or istack:get_count()>=step then
-						--start placing
-						local placenodes=lookup[step]
-						while step>0 do
-							minetest.set_node(pos, {name=def.nodename_prefix.."_"..placenodes[step], param2=param2})
-							if not minetest.is_creative_enabled(player:get_player_name()) then
-								istack:take_item()
-							end
-							step=step-1
-							pos=vector.subtract(pos, dirvec)
-						end
-					else
-						minetest.chat_send_player(player:get_player_name(), attrans("Can't place: Not enough slope items left (@1 required)", step))
-					end
-				else
-					minetest.chat_send_player(player:get_player_name(), attrans("Can't place: There's no slope of length @1",step))
-				end
-				return istack
-			end
-			step=step+1
-			pos=vector.add(pos, dirvec)
-		end
-		minetest.chat_send_player(player:get_player_name(), attrans("Can't place: no supporting node at upper end."))
-		return istack
-	end
-end
-
-advtrains.slope=sl
-
---END code, BEGIN definition
---definition format: ([] optional)
---[[{
-	nodename_prefix
-	texture_prefix
-	[shared_texture]
-	models_prefix
-	models_suffix (with dot)
-	[shared_model]
-	formats={
-		st,cr,swlst,swlcr,swrst,swrcr,vst1,vst2
-		(each a table with indices 0-3, for if to register a rail with this 'rotation' table entry. nil is assumed as 'all', set {} to not register at all)
-	}
-	common={} change something on common rail appearance
-}]]
-
-
-
-
-
-
-
-
-
diff --git a/advtrains/trainhud.lua b/advtrains/trainhud.lua
index e0fc259..9d9d475 100644
--- a/advtrains/trainhud.lua
+++ b/advtrains/trainhud.lua
@@ -1,5 +1,7 @@
 --trainhud.lua: holds all the code for train controlling
 
+local T = advtrains.texture
+
 advtrains.hud = {}
 advtrains.hhud = {}
 
@@ -8,6 +10,8 @@ advtrains.hud[player:get_player_name()] = nil
 advtrains.hhud[player:get_player_name()] = nil
 end)
 
+local hud_type_key = minetest.features.hud_def_type_field and "type" or "hud_elem_type"
+
 local mletter={[1]="F", [-1]="R", [0]="N"}
 
 function advtrains.on_control_change(pc, train, flip)
@@ -46,6 +50,10 @@ function advtrains.on_control_change(pc, train, flip)
 			train.ctrl_user = 1
 			act=true
 		end
+		if train.ars_disable and pc.up then
+			-- up clears ars disable flag in any situation
+			train.ars_disable = nil
+		end
 		-- If atc command set, only "Jump" key can clear command. To prevent accidental control.
 		if train.tarvelocity or train.atc_command then
 			return
@@ -101,19 +109,21 @@ function advtrains.set_trainhud(name, text, driver)
 	if not player then
 	   return
 	end
+	local drivertext = driver or ""
 	local driverhud = {
-		type = "image",
+		[hud_type_key] = "image",
 		name = "ADVTRAINS_DRIVER",
 		position = {x=0.5, y=1},
 		offset = {x=0,y=-170},
-		text = driver or "",
+		text = drivertext,
 		alignment = {x=0,y=-1},
-		scale = {x=1,y=1},}
+		scale = {x=1,y=1},
+	}
 	if not hud then
-		hud = {["driver"]={}}
+		hud = {}
 		advtrains.hud[name] = hud
 		hud.id = player:hud_add({
-			type = "text",
+			[hud_type_key] = "text",
 			name = "ADVTRAINS",
 			number = 0xFFFFFF,
 			position = {x=0.5, y=1},
@@ -122,17 +132,22 @@ function advtrains.set_trainhud(name, text, driver)
 			scale = {x=200, y=60},
 			alignment = {x=0, y=-1},
 		})
-		hud.oldText=text
 		hud.driver = player:hud_add(driverhud)
+		hud.oldText = text
+		hud.oldDriver = drivertext
 	else
 		if hud.oldText ~= text then
 			player:hud_change(hud.id, "text", text)
 			hud.oldText=text
 		end
 		if hud.driver then
-			player:hud_change(hud.driver, "text", driver or "")
+			if hud.oldDriver ~= drivertext then
+				player:hud_change(hud.driver, "text", drivertext)
+				hud.oldDriver = drivertext
+			end
 		elseif driver then
 			hud.driver = player:hud_add(driverhud)
+			hud.oldDriver = drivertext
 		end
 	end
 end
@@ -147,7 +162,7 @@ function advtrains.set_help_hud(name, text)
 		hud = {}
 		advtrains.hhud[name] = hud
 		hud.id = player:hud_add({
-			type = "text",
+			[hud_type_key] = "text",
 			name = "ADVTRAINS_HELP",
 			number = 0xFFFFFF,
 			position = {x=1, y=0.3},
@@ -184,138 +199,108 @@ function advtrains.hud_train_format(train, flip)
 	local vel = advtrains.abs_ceil(train.velocity)
 	local vel_kmh=advtrains.abs_ceil(advtrains.ms_to_kmh(train.velocity))
 	
-	local tlev=train.lever or 1
+	local tlev=train.lever or 3
 	if train.velocity==0 and not train.active_control then tlev=1 end
 	if train.hud_lzb_effect_tmr then
 		tlev=1
 	end
 	
-	local ht = {"[combine:440x110:0,0=(advtrains_hud_bg.png^[resize\\:440x110)"}
+	local hud = T.combine(440, 110, "black")
 	local st = {}
 	if train.debug then st = {train.debug} end
 	
-	-- seven-segment display
-	local function sevenseg(digit, x, y, w, h, m)
-		--[[
-		 -1-
-		2   3
-		 -4-
-		5   6
-		 -7-
-		]]
-		local segs = {
-			{h, 0, w, h},
-			{0, h, h, w},
-			{w+h, h, h, w},
-			{h, w+h, w, h},
-			{0, w+2*h, h, w},
-			{w+h, w+2*h, h, w},
-			{h, 2*(w+h), w, h}}
-		local trans = {
-			[0] = {true, true, true, false, true, true, true},
-			[1] = {false, false, true, false, false, true, false},
-			[2] = {true, false, true, true, true, false, true},
-			[3] = {true, false, true, true, false, true, true},
-			[4] = {false, true, true, true, false, true, false},
-			[5] = {true, true, false, true, false, true, true},
-			[6] = {true, true, false, true, true, true, true},
-			[7] = {true, false, true, false, false, true, false},
-			[8] = {true, true, true, true, true, true, true},
-			[9] = {true, true, true, true, false, true, true}}
-		local ent = trans[digit or 10]
-		if not ent then return end
-		for i = 1, 7, 1 do
-			if ent[i] then
-				local s = segs[i]
-				ht[#ht+1] = sformat("%d,%d=(advtrains_hud_bg.png^[resize\\:%dx%d^%s)",x+s[1], y+s[2], s[3], s[4], m)
-			end
-		end
-	end
-	
 	-- lever
-	ht[#ht+1] = "275,10=(advtrains_hud_bg.png^[colorize\\:cyan^[resize\\:5x18)"
-	ht[#ht+1] = "275,28=(advtrains_hud_bg.png^[colorize\\:white^[resize\\:5x18)"
-	ht[#ht+1] = "275,46=(advtrains_hud_bg.png^[colorize\\:orange^[resize\\:5x36)"
-	ht[#ht+1] = "275,82=(advtrains_hud_bg.png^[colorize\\:red^[resize\\:5x18)"
-	ht[#ht+1] = "292,16=(advtrains_hud_bg.png^[colorize\\:darkslategray^[resize\\:6x78)"
-	ht[#ht+1] = sformat("280,%s=(advtrains_hud_bg.png^[colorize\\:gray^[resize\\:30x18)",18*(4-tlev)+10)
+	hud:add_multicolor_fill_topdown(275, 10, 5, 90, 1, "cyan", 1, "white", 2, "orange", 1, "red")
+	hud:add_lever_topdown(280, 10, 30, 90, 18, 6, (4-tlev)/4, "gray", "darkslategray")
 	-- reverser
-	ht[#ht+1] = sformat("245,10=(advtrains_hud_arrow.png^[transformFY%s)", flip and "" or "^[multiply\\:cyan")
-	ht[#ht+1] = sformat("245,85=(advtrains_hud_arrow.png%s)", flip and "^[multiply\\:orange" or "")
-	ht[#ht+1] = "250,35=(advtrains_hud_bg.png^[colorize\\:darkslategray^[resize\\:5x40)"
-	ht[#ht+1] = sformat("240,%s=(advtrains_hud_bg.png^[resize\\:25x15^[colorize\\:gray)", flip and 65 or 30)
+	hud:add(245, 10, T"advtrains_hud_arrow.png":transform"FY":multiply(flip and "gray" or "cyan"))
+	hud:add(245, 85, T"advtrains_hud_arrow.png":multiply(flip and "orange" or "gray"))
+	hud:add_lever_topdown(240, 30, 25, 50, 15, 5, flip and 1 or 0, "gray", "darkslategray")
 	-- train control/safety indication
-	if train.tarvelocity or train.atc_command then
-		ht[#ht+1] = "10,10=(advtrains_hud_atc.png^[resize\\:30x30^[multiply\\:cyan)"
-	end
-	if train.hud_lzb_effect_tmr then
-		ht[#ht+1] = "50,10=(advtrains_hud_lzb.png^[resize\\:30x30^[multiply\\:red)"
-	end
-	if train.is_shunt then
-		ht[#ht+1] = "90,10=(advtrains_hud_shunt.png^[resize\\:30x30^[multiply\\:orange)"
-	end
+	hud:add(10, 10, T"advtrains_hud_atc.png":resize(30, 30):multiply((train.tarvelocity or train.atc_command) and "cyan" or "darkslategray"))
+	hud:add(50, 10, T"advtrains_hud_lzb.png":resize(30, 30):multiply(train.hud_lzb_effect_tmr and "red" or "darkslategray"))
+	hud:add(90, 10, T"advtrains_hud_shunt.png":resize(30, 30):multiply(train.is_shunt and "orange" or "darkslategray"))
 	-- door
-	ht[#ht+1] = "187,10=(advtrains_hud_bg.png^[resize\\:26x30^[colorize\\:white)"
-	ht[#ht+1] = "189,12=(advtrains_hud_bg.png^[resize\\:22x11)"
-	ht[#ht+1] = sformat("170,10=(advtrains_hud_bg.png^[resize\\:15x30^[colorize\\:%s)", train.door_open==-1 and "white" or "darkslategray")
-	ht[#ht+1] = "172,12=(advtrains_hud_bg.png^[resize\\:11x11)"
-	ht[#ht+1] = sformat("215,10=(advtrains_hud_bg.png^[resize\\:15x30^[colorize\\:%s)", train.door_open==1 and "white" or "darkslategray")
-	ht[#ht+1] = "217,12=(advtrains_hud_bg.png^[resize\\:11x11)"
+	hud:add_fill(187, 10, 26, 30, "white"):add_fill(189, 12, 22, 11, "black")
+	hud:add_fill(170, 10, 15, 30, train.door_open==-1 and "white" or "darkslategray"):add_fill(172, 12, 11, 11, "black")
+	hud:add_fill(215, 10, 15, 30, train.door_open==1 and "white" or "darkslategray"):add_fill(217, 12, 11, 11, "black")
 	-- speed indication(s)
-	sevenseg(math.floor(vel/10), 320, 10, 30, 10, "[colorize\\:red\\:255")
-	sevenseg(vel%10, 380, 10, 30, 10, "[colorize\\:red\\:255")
-	for i = 1, vel, 1 do
-		ht[#ht+1] = sformat("%d,65=(advtrains_hud_bg.png^[resize\\:8x20^[colorize\\:white)", i*11-1)
-	end
-	for i = max+1, 20, 1 do
-		ht[#ht+1] = sformat("%d,65=(advtrains_hud_bg.png^[resize\\:8x20^[colorize\\:darkslategray)", i*11-1)
-	end
+	hud:add_n7seg(320, 10, 110, 90, vel, 2, "red")
+	hud:add_segmentbar_leftright(10, 65, 217, 20, 3, 20, max, 20, "darkslategray", 0, vel, "white")
 	if res and res > 0 then
-		ht[#ht+1] = sformat("%d,60=(advtrains_hud_bg.png^[resize\\:3x30^[colorize\\:red\\:255)", 7+res*11)
+		hud:add_fill(7+res*11, 60, 3, 30, "red")
 	end
 	if train.tarvelocity then
-		ht[#ht+1] = sformat("%d,85=(advtrains_hud_arrow.png^[multiply\\:cyan^[transformFY^[makealpha\\:#000000)", 1+train.tarvelocity*11)
+		hud:add(1+train.tarvelocity*11, 85, T"advtrains_hud_arrow.png":transform"FY":multiply"cyan")
 	end
 	local lzb = train.lzb
-	if lzb and lzb.checkpoints then
-		local oc = lzb.checkpoints
-		for i = 1, #oc do
-			local spd = oc[i].speed
-			spd = advtrains.speed.min(spd, train.speed_restriction)
-			if spd == -1 then spd = nil end
-			local c = not spd and "lime" or (type(spd) == "number" and (spd == 0) and "red" or "orange") or nil
-			if c then
-				ht[#ht+1] = sformat("130,10=(advtrains_hud_bg.png^[resize\\:30x5^[colorize\\:%s)",c)
-				ht[#ht+1] = sformat("130,35=(advtrains_hud_bg.png^[resize\\:30x5^[colorize\\:%s)",c)
-				if spd and spd~=0 then
-					ht[#ht+1] = sformat("%d,50=(advtrains_hud_arrow.png^[multiply\\:red^[makealpha\\:#000000)", 1+spd*11) 
-				end
-				local floor = math.floor
-				local dist = floor(((oc[i].index or train.index)-train.index))
-				dist = math.max(0, math.min(999, dist))
-				for j = 1, 3, 1 do
-					sevenseg(floor((dist/10^(3-j))%10), 119+j*11, 18, 4, 2, "[colorize\\:"..c)
+	local lzbdisp = {c = "darkslategray", d = 888}
+	if lzb and lzb.checkpoints and lzb.checkpoints[1] then
+		local cp = lzb.checkpoints[1]
+		if advtrains.interlocking and cp.udata and cp.udata.signal_pos then
+			local sigd = advtrains.interlocking.db.get_sigd_for_signal(cp.udata.signal_pos)
+			if sigd then
+				local tcbs = advtrains.interlocking.db.get_tcbs(sigd) or {}
+				if tcbs.route_rsn then
+					table.insert(st, ("%s: %s"):format(minetest.pos_to_string(sigd.p), tcbs.route_rsn))
 				end
-				break
 			end
 		end
+		local spd = cp.speed
+		local c, arrow
+		if not spd or spd == -1 then
+			c = "lime"
+		elseif spd == 0 then
+			c = "red"
+		elseif not res or spd <= res then
+			c = "orange"
+			arrow = true
+		elseif spd <= max then
+			c = "yellow"
+			arrow = true
+		else
+			c = "cyan"
+			arrow = true
+		end
+		if arrow then
+			hud:add(1+spd*11, 50, T"advtrains_hud_arrow.png":multiply"red")
+		end
+		local dist = math.floor(((cp.index or train.index)-train.index))
+		dist = math.max(0, math.min(999, dist))
+		lzbdisp = {c = c, d = dist}
 	end
+	hud:add_fill(130, 10, 30, 5, lzbdisp.c)
+	hud:add_fill(130, 35, 30, 5, lzbdisp.c)
+	hud:add_n7seg(131, 18, 28, 14, lzbdisp.d, 3, lzbdisp.c)
 	
 	if res and res == 0 then
-		st[#st+1] = attrans("OVERRUN RED SIGNAL! Examine situation and reverse train to move again.")
+		table.insert(st, attrans("OVERRUN RED SIGNAL! Examine situation and reverse train to move again."))
 	end
 	
 	if train.atc_command then
-			st[#st+1] = sformat("ATC: %s%s", train.atc_delay and advtrains.abs_ceil(train.atc_delay).."s " or "", train.atc_command or "")
+		local delay_str = ""
+		if train.atc_delay and train.atc_delay >= 0 then
+			delay_str = advtrains.abs_ceil(train.atc_delay).."s "
+		end
+		if train.atc_wait_finish then
+			delay_str = delay_str.."[W] "
+		end
+		if train.atc_wait_autocouple then
+			delay_str = delay_str.."[Cpl] "
+		end
+		if train.atc_wait_signal then
+			delay_str = delay_str.."[G] "
+		end
+		table.insert(st, ("ATC: %s%s"):format(delay_str, train.atc_command or ""))
 	end
 	
-	return table.concat(st,"\n"), table.concat(ht,":")
+	return table.concat(st,"\n"), tostring(hud)
 end
 
 local _, texture = advtrains.hud_train_format { -- dummy train object to demonstrate the train hud
 	max_speed = 15, speed_restriction = 15, velocity = 15, tarvelocity = 12,
 	active_control = true, lever = 3, ctrl = {lzb = true}, is_shunt = true,
-	door_open = 1, lzb = {oncoming = {{spd=6, idx=125.7}}}, index = 0,
+	door_open = 1, lzb = {checkpoints = {{speed=6, index=125.7}}}, index = 100,
 }
 
 minetest.register_node("advtrains:hud_demo",{
diff --git a/advtrains/trainlogic.lua b/advtrains/trainlogic.lua
index 4177bc2..14f3f8b 100644
--- a/advtrains/trainlogic.lua
+++ b/advtrains/trainlogic.lua
@@ -149,10 +149,8 @@ minetest.register_on_joinplayer(function(player)
 		local pname = player:get_player_name()
 		local id=advtrains.player_to_train_mapping[pname]
 		if id then
-			for _,wagon in pairs(minetest.luaentities) do
-				if wagon.is_wagon and wagon.initialized and wagon.train_id==id then
-					wagon:reattach_all()
-				end
+			for _, wagon in advtrains.wagon_entity_pairs_in_train(id) do
+				wagon:reattach_all()
 			end
 		end
 end)
@@ -164,12 +162,10 @@ minetest.register_on_dieplayer(function(player)
 		if id then
 			local train=advtrains.trains[id]
 			if not train then advtrains.player_to_train_mapping[pname]=nil return end
-			for _,wagon in pairs(minetest.luaentities) do
-				if wagon.is_wagon and wagon.initialized and wagon.train_id==id then
-					--when player dies, detach him from the train
-					--call get_off_plr on every wagon since we don't know which one he's on.
-					wagon:get_off_plr(pname)
-				end
+			for _, wagon in advtrains.wagon_entity_pairs_in_train(id) do
+				--when player dies, detach him from the train
+				--call get_off_plr on every wagon since we don't know which one he's on.
+				wagon:get_off_plr(pname)
 			end
 			-- just in case no wagon felt responsible for this player: clear train mapping
 			advtrains.player_to_train_mapping[pname] = nil
@@ -274,6 +270,10 @@ function advtrains.train_ensure_init(id, train)
 		atwarn(debug.traceback())
 		return nil
 	end
+
+	if not train.staticdata then
+		train.staticdata = {}
+	end
 	
 	train.dirty = true
 	if train.no_step then
@@ -284,10 +284,12 @@ function advtrains.train_ensure_init(id, train)
 	assertdef(train, "velocity", 0)
 	--assertdef(train, "tarvelocity", 0)
 	assertdef(train, "acceleration", 0)
-	assertdef(train, "id", id)
-	
+	if train.id ~= id then
+		train.id = id
+	end
+	assertdef(train, "path_ori_cp", {})
 	
-	if not train.drives_on or not train.max_speed then
+	if not train.max_speed then
 		--atprint("in ensure_init: missing properties, updating!")
 		advtrains.update_trainpart_properties(id)
 	end
@@ -432,7 +434,8 @@ function advtrains.train_step_b(id, train, dtime)
 		if train.atc_command then
 			if (not train.atc_delay or train.atc_delay<=0)
 					and not train.atc_wait_finish
-					and not train.atc_wait_autocouple then
+					and not train.atc_wait_autocouple
+					and not train.atc_wait_signal then
 				advtrains.atc.execute_atc_command(id, train)
 			elseif train.atc_delay and train.atc_delay > 0 then
 				train.atc_delay=train.atc_delay-dtime
@@ -461,6 +464,15 @@ function advtrains.train_step_b(id, train, dtime)
 				train.atc_wait_finish=nil
 			end
 		end
+		-- clear atc_wait_signal immediately when the next LZB checkpoint is not a "stop"
+		-- (but make sure lzb is initialized, otherwise wait for it)
+		if train.atc_wait_signal and train.lzb then
+			local first_ckp = train.lzb.checkpoints and train.lzb.checkpoints[1]
+			-- no checkpoint exists, or it has a speed of either nil or >0
+			if not first_ckp or first_ckp.speed ~= 0 then
+				train.atc_wait_signal = nil
+			end
+		end
 		
 		if train.tarvelocity and train.tarvelocity>v0 then
 			--atprint("in train_step_b: applying ATC ACCEL", train.tarvelocity)
@@ -623,7 +635,7 @@ function advtrains.train_step_b(id, train, dtime)
 		local base_cn =  train.path_cn[base_idx]
 		--atdebug(id,"Begin Checking for on-track collisions new_idx=",new_index_curr_tv,"base_idx=",base_idx,"base_pos=",base_pos,"base_cn=",base_cn)
 		-- query occupation
-		local occ = advtrains.occ.get_trains_over(base_pos)
+		local occ = advtrains.occ.reverse_lookup_sel(base_pos, "close_proximity")
 		-- iterate other trains
 		for otid, ob_idx in pairs(occ) do
 			if otid ~= id then
@@ -653,7 +665,7 @@ function advtrains.train_step_b(id, train, dtime)
 
 				-- Phase 2 - project ref_index back onto our path and check again (necessary because there might be a turnout on the way and we are driving into the flank
 				if target_is_inside then
-					local our_index = advtrains.path_project(otrn, ref_index, id)
+					local our_index = advtrains.path_project(otrn, ref_index, id, "before_end")
 					--atdebug("Backprojected our_index",our_index)
 					if our_index and our_index <= new_index_curr_tv
 							and our_index >= train.index then --FIX: If train was already past the collision point in the previous step, there is no collision! Fixes bug with split_at_index
@@ -820,9 +832,12 @@ function advtrains.train_step_c(id, train, dtime)
 			if is_loaded_area then
 				local objs = minetest.get_objects_inside_radius(rcollpos, 2)
 				for _,obj in ipairs(objs) do
-					if not obj:is_player() and obj:get_armor_groups().fleshy and obj:get_armor_groups().fleshy > 0 
-							and obj:get_luaentity() and obj:get_luaentity().name~="signs_lib:text" then
-						obj:punch(obj, 1, { full_punch_interval = 1.0, damage_groups = {fleshy = 1000}, }, nil)
+					if not obj:is_player() then
+						local armor = obj:get_armor_groups()
+						local luaentity = obj:get_luaentity()
+						if armor.fleshy and armor.fleshy > 0 and luaentity and luaentity.name ~= "signs_lib:text" then
+							obj:punch(obj, 1, { full_punch_interval = 1.0, damage_groups = {fleshy = 1000}, }, nil)
+						end
 					end
 				end
 			end
@@ -860,7 +875,7 @@ local callbacks_leave_node, run_callbacks_leave_node = mknodecallback("leave")
 -- Node callback for approaching
 -- Might be called multiple times, whenever path is recalculated. Also called for the first node the train is standing on, then has_entered is true.
 -- signature is function(pos, id, train, index, has_entered, lzbdata)
--- has_entered: true if the "enter" callback has already been executed for this train in this location
+-- has_entered: Provided for legacy reasons. Always false. (used to signify that the enter callback has already been called, at a time where enter was still called at .5 index)
 -- lzbdata: arbitrary data (shared between all callbacks), deleted when LZB is restarted.
 -- These callbacks are called in order of distance as train progresses along tracks, so lzbdata can be used to
 -- keep track of a train's state once it passes this point
@@ -879,13 +894,10 @@ local function tnc_call_enter_callback(pos, train_id, train, index)
 	run_callbacks_enter_node(pos, train_id, train, index)
 	
 	-- check for split points
-	if mregnode and mregnode.at_conns and #mregnode.at_conns == 3 and train.path_cp[index] == 3 then
-		-- train came from connection 3 of a switch, so it split points.
-		if not train.points_split then
-			train.points_split = {}
-		end
-		train.points_split[advtrains.encode_pos(pos)] = true
-		--atdebug(train_id,"split points at",pos)
+	if mregnode and mregnode.at_conn_map then
+		-- If this node has >2 conns (and a connmap), remember the connection where we came from to handle split points
+		--atdebug("Train",train_id,"at",pos,"saving turnout origin CP",train.path_cp[index],"for path item",index)
+		train.path_ori_cp[advtrains.encode_pos(pos)] = train.path_cp[index]
 	end
 end
 local function tnc_call_leave_callback(pos, train_id, train, index)
@@ -900,23 +912,16 @@ local function tnc_call_leave_callback(pos, train_id, train, index)
 	run_callbacks_leave_node(pos, train_id, train, index)
 	
 	-- split points do not matter anymore. clear them
-	if train.points_split then
-		if train.points_split[advtrains.encode_pos(pos)] then
-			train.points_split[advtrains.encode_pos(pos)] = nil
-			--atdebug(train_id,"has passed split points at",pos)
-		end
-		-- any entries left?
-		for _,_ in pairs(train.points_split) do
-			return
-		end
-		train.points_split = nil
+	if mregnode and mregnode.at_conn_map then
+		-- If this node has >2 conns (and a connmap), remember the connection where we came from to handle split points
+		--atdebug("Train",train_id,"at",pos,"removing turnout origin CP for path item",index," because train has left it")
+		train.path_ori_cp[advtrains.encode_pos(pos)] = nil
 	end
-	-- WARNING possibly unreachable place!
 end
 
 function advtrains.tnc_call_approach_callback(pos, train_id, train, index, lzbdata)
 	--atdebug("tnc approach",pos,train_id, lzbdata)
-	local has_entered = atround(train.index) == index
+	local has_entered = false -- 2024-11-25: has_entered is now always false, because enter point = LZB hit point!
 	
 	local node = advtrains.ndb.get_node(pos) --this spares the check if node is nil, it has a name in any case
 	local mregnode=minetest.registered_nodes[node.name]
@@ -929,18 +934,21 @@ function advtrains.tnc_call_approach_callback(pos, train_id, train, index, lzbda
 end
 
 -- === te callback definition for tnc node callbacks ===
+-- Change 2024-11-25: Enter node happens when index surpasses whole number (i.e. at center of rail)
+-- Instead of atround (prev behavior) nouw use floor and ceil (note this also fixes issues where index was exactly on .0)
+local atceil = math.ceil
 
 advtrains.te_register_on_new_path(function(id, train)
 	train.tnc = {
-		old_index = atround(train.index),
-		old_end_index = atround(train.end_index),
+		old_index = atfloor(train.index),
+		old_end_index = atceil(train.end_index),
 	}
 	--atdebug(id,"tnc init",train.index,train.end_index)
 end)
 
 advtrains.te_register_on_update(function(id, train)
-	local new_index = atround(train.index)
-	local new_end_index = atround(train.end_index)
+	local new_index = atfloor(train.index)
+	local new_end_index = atceil(train.end_index)
 	local old_index = train.tnc.old_index
 	local old_end_index = train.tnc.old_end_index
 	while old_index < new_index do
@@ -958,8 +966,8 @@ advtrains.te_register_on_update(function(id, train)
 end)
 
 advtrains.te_register_on_create(function(id, train)
-	local index = atround(train.index)
-	local end_index = atround(train.end_index)
+	local index = atfloor(train.index)
+	local end_index = atceil(train.end_index)
 	while end_index <= index do
 		local pos = advtrains.round_vector_floor_y(advtrains.path_get(train,end_index))
 		tnc_call_enter_callback(pos, id, train, end_index)
@@ -969,8 +977,8 @@ advtrains.te_register_on_create(function(id, train)
 end)
 
 advtrains.te_register_on_remove(function(id, train)
-	local index = atround(train.index)
-	local end_index = atround(train.end_index)
+	local index = atfloor(train.index)
+	local end_index = atceil(train.end_index)
 	while end_index <= index do
 		local pos = advtrains.round_vector_floor_y(advtrains.path_get(train,end_index))
 		tnc_call_leave_callback(pos, id, train, end_index)
@@ -1052,10 +1060,9 @@ end
 
 -- Note: safe_decouple_wagon() has been moved to wagons.lua
 
--- this function sets wagon's pos_in_train(parts) properties and train's max_speed and drives_on (and more)
+-- this function sets wagon's pos_in_train(parts) properties and train's max_speed (and more)
 function advtrains.update_trainpart_properties(train_id, invert_flipstate)
 	local train=advtrains.trains[train_id]
-	train.drives_on=advtrains.merge_tables(advtrains.all_tracktypes)
 	--FIX: deep-copy the table!!!
 	train.max_speed=20
 	train.extent_h = 0;
@@ -1071,7 +1078,16 @@ function advtrains.update_trainpart_properties(train_id, invert_flipstate)
 		if data then
 			local wagon = advtrains.wagon_prototypes[data.type or data.entity_name]
 			if not wagon then
-				atwarn("Wagon '",data.type,"' couldn't be found. Please check that all required modules are loaded!")
+				local ent = advtrains.wagon_objects[w_id]
+				local pdesc
+				if ent and ent:get_pos() then
+					pdesc = "at " .. minetest.pos_to_string(ent:get_pos())
+				elseif train.last_pos then
+					pdesc = "near " .. minetest.pos_to_string(train.last_pos)
+				else
+					pdesc = "at an unknown location"
+				end
+				atwarn(string.format("Wagon %q %s could not be found. Please check that all required modules are loaded!", data.type, pdesc))
 				wagon = advtrains.wagon_prototypes["advtrains:wagon_placeholder"]
 
 			end
@@ -1088,13 +1104,6 @@ function advtrains.update_trainpart_properties(train_id, invert_flipstate)
 			end
 			rel_pos=rel_pos+wagon.wagon_span
 			
-			if wagon.drives_on then
-				for k,_ in pairs(train.drives_on) do
-					if not wagon.drives_on[k] then
-						train.drives_on[k]=nil
-					end
-				end
-			end
 			train.max_speed=math.min(train.max_speed, wagon.max_speed)
 			train.extent_h = math.max(train.extent_h, wagon.extent_h or 1);
 		end
@@ -1126,8 +1135,17 @@ function advtrains.spawn_wagons(train_id)
 				if advtrains.position_in_range(pos, ablkrng) then
 					--atdebug("wagon",w_id,"spawning")
 					local wt = advtrains.get_wagon_prototype(data)
-					local wagon = minetest.add_entity(pos, wt):get_luaentity()
-					wagon:set_id(w_id)
+					local wobj = minetest.add_entity(pos, wt)
+					if not wobj then
+						atwarn("Failed to spawn wagon", w_id, "of type", wt)
+					else
+						local wagon = wobj:get_luaentity()
+						if not wagon then
+							atwarn("Wagon", w_id, "of type", wt, "spawned with nil luaentity")
+						else
+							wagon:set_id(w_id)
+						end
+					end
 				end
 			end
 		else
@@ -1194,6 +1212,8 @@ function advtrains.split_train_at_index(train, index)
 	newtrain.points_split = advtrains.merge_tables(train.points_split)
 	newtrain.autocouple = train.autocouple
 
+	advtrains.te_run_callbacks_on_decouple(train, newtrain, index)
+
 	return newtrain_id -- return new train ID, so new train can be manipulated
 
 end
@@ -1206,8 +1226,24 @@ function advtrains.invert_train(train_id)
 		return
 	end
 	
+	-- Before flipping the train, we must check if there are any points on the path
+	-- which will become split on rotating, and store their cn (which will become the cp)
+	local ori_cp_after_flip = {}
+	for index = atround(train.end_index),atround(train.index) do
+		local pos = advtrains.path_get(train, index)
+		local ok, conns, railheight, connmap = advtrains.get_rail_info_at(pos)
+		if ok and connmap then
+			--atdebug("Reversing Train",train.id," ori_cp Checks: at",pos,"saving turnout origin CP",train.path_cn[index],"for path item",index)
+			ori_cp_after_flip[advtrains.encode_pos(pos)] = train.path_cn[index]
+		end
+	end
+	
+	-- Actual rotation happens here! This sets the path restore position to the end of the train, inverting the connid.
 	advtrains.path_setrestore(train, true)
 	
+	-- clear the origin cp list because it is now invalid, and replace it by what we built prior.
+	train.path_ori_cp = ori_cp_after_flip
+	
 	-- rotate some other stuff
 	if train.door_open then
 		train.door_open = - train.door_open
@@ -1227,7 +1263,6 @@ function advtrains.invert_train(train_id)
 	advtrains.update_trainpart_properties(train_id, true)
 	
 	-- recalculate path
-	advtrains.train_ensure_init(train_id, train)
 	
 	-- If interlocking present, check whether this train is in a section and then set as shunt move after reversion
 	if advtrains.interlocking and train.il_sections and #train.il_sections > 0 then
@@ -1253,7 +1288,7 @@ function advtrains.invalidate_all_paths(pos)
 	local tab
 	if pos then
 		-- if position given, check occupation system
-		tab = advtrains.occ.get_trains_over(pos)
+		tab = advtrains.occ.reverse_lookup_quick(pos)
 	else
 		tab = advtrains.trains
 	end
@@ -1266,7 +1301,7 @@ end
 -- Calls invalidate_path_ahead on all trains occupying (having paths over) this node
 -- Can be called during train step.
 function advtrains.invalidate_all_paths_ahead(pos)
-	local tab = advtrains.occ.get_trains_over(pos)
+	local tab = advtrains.occ.reverse_lookup_sel(pos, "first_ahead")
 	
 	for id,index in pairs(tab) do
 		local train = advtrains.trains[id]
diff --git a/advtrains/wagonprop_tool.lua b/advtrains/wagonprop_tool.lua
new file mode 100644
index 0000000..2a4a9e2
--- /dev/null
+++ b/advtrains/wagonprop_tool.lua
@@ -0,0 +1,43 @@
+minetest.register_craftitem("advtrains:wagon_prop_tool",{ --craftitem because it does nothing on its own
+	description = attrans("Wagon Properties Tool\nPunch a wagon to view and edit the Wagon Properties"),
+	short_description = attrans("Wagon Properties Tool"),
+	groups = {},
+	inventory_image = "advtrains_wagon_prop_tool.png",
+	wield_image = "advtrains_wagon_prop_tool.png",
+	stack_max = 1,
+	on_use = function(itemstack, user, pointed_thing)
+		local pname = user:get_player_name()
+		if not pname or pname == "" then
+			return
+		end
+
+		--sanity checks in case of clicking the wrong entity/node/nothing
+		if pointed_thing.type ~= "object" then return end --not an entity
+		local object = pointed_thing.ref:get_luaentity()
+		if not object.id then return end --entity doesn't have an id field
+
+		local wagon = advtrains.wagons[object.id] --check if wagon exists in advtrains
+		if not wagon then --not a wagon
+			return
+		end --end sanity checks
+
+		--whitelist protection check
+		if not advtrains.check_driving_couple_protection(pname,wagon.owner,wagon.whitelist) then
+			minetest.chat_send_player(pname, attrans("Insufficient privileges to use this!"))
+			return
+		end
+		object:show_wagon_properties(pname)
+		return itemstack
+	end,
+})
+
+if minetest.get_modpath("default") then --register recipe
+	minetest.register_craft({
+		output = "advtrains:wagon_prop_tool",
+		recipe = {
+			{"advtrains:dtrack_placer","dye:black","default:paper"},
+			{"screwdriver:screwdriver","default:paper","default:paper"},
+			{"","","group:wood"},
+		}
+	})
+end
\ No newline at end of file
diff --git a/advtrains/wagons.lua b/advtrains/wagons.lua
index 7c952f5..38210ef 100644
--- a/advtrains/wagons.lua
+++ b/advtrains/wagons.lua
@@ -14,7 +14,13 @@ local IGNORE_WORLD = advtrains.IGNORE_WORLD
 local has_wielded_light = core.get_modpath("wielded_light")
 
 advtrains.wagons = {}
-advtrains.wagon_prototypes = {}
+advtrains.wagon_alias = {}
+advtrains.wagon_prototypes = setmetatable({}, {
+	__index = function(t, k)
+		local _, proto = advtrains.resolve_wagon_alias(k)
+		return proto
+	end
+})
 advtrains.wagon_objects = {}
 
 local unload_wgn_range = advtrains.wagon_load_range + 32
@@ -61,6 +67,7 @@ local wagon = {
 	has_inventory=false,
 }
 
+
 function wagon:train()
 	local data = advtrains.wagons[self.id]
 	return advtrains.trains[data.train_id]
@@ -203,7 +210,7 @@ function wagon:on_punch(puncher, time_from_last_punch, tool_capabilities, direct
 			end
 			for listname, _ in pairs(inv:get_lists()) do
 				if not inv:is_empty(listname) then
-					minetest.chat_send_player(puncher:get_player_name(), attrans("The wagon's inventory is not empty!"));
+					minetest.chat_send_player(puncher:get_player_name(), attrans("The wagon's inventory is not empty."));
 					return
 				end
 			end
@@ -283,7 +290,7 @@ function wagon:on_step(dtime)
 		local data = advtrains.wagons[self.id]
 		
 		if not pos then
-			--atdebug("["..self.id.."][fatal] missing position (object:getpos() returned nil)")
+			--atdebug("["..self.id.."][fatal] missing position (object:get_pos() returned nil)")
 			return
 		end
 		
@@ -366,7 +373,16 @@ function wagon:on_step(dtime)
 
 		--show off-track information in outside text instead of notifying the whole server about this
 		if train.off_track then
-			outside = outside .."\n" .. attrans("!!! Train off track !!!")
+			outside = outside .."\n!!! Vlak mimo koleje !!!"
+		end
+		
+		-- liquid container: display liquid contents in infotext
+		if self.techage_liquid_capacity then
+			if data.techage_liquid and data.techage_liquid.name then
+				outside = outside .."\nKapalina: "..data.techage_liquid.name..", "..data.techage_liquid.amount.." jednotek"
+			else
+				outside = outside .."\nKapalina: empty"
+			end
 		end
 		
 		if self.infotext_cache~=outside  then
@@ -696,7 +712,7 @@ function wagon:on_rightclick(clicker)
 				end
 				
 				local doors_open = self:train().door_open~=0 or clicker:get_player_control().sneak
-				local allow, rsn=false, "Wagon has no seats!"
+				local allow, rsn=false, attrans("This wagon has no seats.")
 				for _,sgr in ipairs(self.assign_to_seat_group) do
 					allow, rsn = self:check_seat_group_access(pname, sgr)
 					if allow then
@@ -707,16 +723,16 @@ function wagon:on_rightclick(clicker)
 										self:get_on(clicker, seatid)
 										return
 									else
-										rsn=attrans("Wagon is full.")
+										rsn=attrans("This wagon is full.")
 									end
 								else
-									rsn=attrans("Doors are closed! (try holding sneak key!)")
+									rsn=attrans("Doors are closed! (Try holding sneak key!)")
 								end
 							end
 						end
 					end
 				end
-				minetest.chat_send_player(pname, attrans("Can't get on: @1", rsn))
+				minetest.chat_send_player(pname, rsn or attrans("You can't get on this wagon."))
 			else
 				self:show_get_on_form(pname)
 			end
@@ -866,8 +882,9 @@ function wagon:show_wagon_properties(pname)
 	]]
 	local data = advtrains.wagons[self.id]
 	local form="size[5,5]"
-	form = form .. "field[0.5,1;4.5,1;whitelist;" .. attrans("Allow these players to access your wagon:") .. ";"..minetest.formspec_escape(data.whitelist or "").."]"
-	form = form .. "field[0.5,2;4.5,1;roadnumber;" .. attrans("Wagon road number:") .. ";"..minetest.formspec_escape(data.roadnumber or "").."]"
+	form=form.."label[0.2,0;"..attrans("This Wagon ID")..": "..self.id.."]"
+	form = form .. "field[0.5,1;4.5,1;whitelist;Allow these players to access your wagon:;"..minetest.formspec_escape(data.whitelist or "").."]"
+	form = form .. "field[0.5,2;4.5,1;roadnumber;Wagon road number:;"..minetest.formspec_escape(data.roadnumber or "").."]"
 	local fc = ""
 	if data.fc then
 		fc = table.concat(data.fc, "!")
@@ -979,6 +996,7 @@ function wagon:show_bordcom(pname)
 	local linhei
 	
 	local form = "size[11,9]label[0.5,0;AdvTrains Boardcom v0.1]"
+	form=form.."textarea[7.5,0.05;10,1;;"..attrans("Train ID")..": "..(minetest.formspec_escape(train.id or ""))..";]"
 	form=form.."textarea[0.5,1.5;7,1;text_outside;"..attrans("Text displayed outside on train")..";"..(minetest.formspec_escape(train.text_outside or "")).."]"
 	form=form.."textarea[0.5,3;7,1;text_inside;"..attrans("Text displayed inside train")..";"..(minetest.formspec_escape(train.text_inside or "")).."]"
 	form=form.."field[7.5,1.75;3,1;line;"..attrans("Line")..";"..(minetest.formspec_escape(train.line or "")).."]"
@@ -1096,12 +1114,11 @@ function wagon:handle_bordcom_fields(pname, formname, fields)
 	for i, tpid in ipairs(train.trainparts) do
 		if fields["dcpl_"..i] then
 			advtrains.safe_decouple_wagon(tpid, pname)
-		elseif fields["wgprp"..i] then
-			for _,wagon in pairs(minetest.luaentities) do
-				if wagon.is_wagon and wagon.initialized and wagon.id==tpid and data.owner==pname then
-					wagon:show_wagon_properties(pname)
-					return
-				end
+		elseif fields["wgprp"..i] and data.owner==pname then
+			local wagon = advtrains.get_wagon_entity(tpid)
+			if wagon then
+				wagon:show_wagon_properties(pname)
+				return
 			end
 		end
 	end
@@ -1147,44 +1164,48 @@ end
 minetest.register_on_player_receive_fields(function(player, formname, fields)
 		local uid=string.match(formname, "^advtrains_geton_(.+)$")
 		if uid then
-			for _,wagon in pairs(minetest.luaentities) do
-				if wagon.is_wagon and wagon.initialized and wagon.id==uid then
-					local data = advtrains.wagons[wagon.id]
-					if fields.inv then
-						if wagon.has_inventory and wagon.get_inventory_formspec then
-							minetest.show_formspec(player:get_player_name(), "advtrains_inv_"..uid, wagon:get_inventory_formspec(player:get_player_name(), make_inv_name(uid)))
-						end
-					elseif fields.seat then
-						local val=minetest.explode_textlist_event(fields.seat)
-						if val and val.type~="INV" and not data.seatp[player:get_player_name()] then
-						--get on
-							wagon:get_on(player, val.index)
-							--will work with the new close_formspec functionality. close exactly this formspec.
-							minetest.show_formspec(player:get_player_name(), formname, "")
-						end
+			local wagon = advtrains.get_wagon_entity(uid)
+			if wagon then
+				local data = advtrains.wagons[wagon.id]
+				if fields.inv then
+					if wagon.has_inventory and wagon.get_inventory_formspec then
+						minetest.show_formspec(player:get_player_name(), "advtrains_inv_"..uid, wagon:get_inventory_formspec(player:get_player_name(), make_inv_name(uid)))
+					end
+				elseif fields.seat then
+					local val=minetest.explode_textlist_event(fields.seat)
+					if val and val.type~="INV" and not data.seatp[player:get_player_name()] then
+					--get on
+						wagon:get_on(player, val.index)
+						--will work with the new close_formspec functionality. close exactly this formspec.
+						minetest.show_formspec(player:get_player_name(), formname, "")
 					end
 				end
 			end
+			return true
 		end
+
 		uid=string.match(formname, "^advtrains_seating_(.+)$")
 		if uid then
-			for _,wagon in pairs(minetest.luaentities) do
-				if wagon.is_wagon and wagon.initialized and wagon.id==uid then
-					local pname=player:get_player_name()
-					local no=wagon:get_seatno(pname)
-					if no then
-						if wagon.seat_groups then
-							wagon:seating_from_key_helper(pname, fields, no)
-						end
+			local wagon = advtrains.get_wagon_entity(uid)
+			if wagon then
+				local pname=player:get_player_name()
+				local no=wagon:get_seatno(pname)
+				if no then
+					if wagon.seat_groups then
+						wagon:seating_from_key_helper(pname, fields, no)
 					end
 				end
 			end
+			return true
 		end
+
 		uid=string.match(formname, "^advtrains_prop_(.+)$")
 		if uid then
 			local pname=player:get_player_name()
 			local data = advtrains.wagons[uid]
-			if pname~=data.owner and not minetest.check_player_privs(pname, {train_admin = true}) then
+			if not data then
+				return true
+			elseif pname~=data.owner and not minetest.check_player_privs(pname, {train_admin = true}) then
 				return true
 			end
 			if fields.save or not fields.quit then
@@ -1206,29 +1227,32 @@ minetest.register_on_player_receive_fields(function(player, formname, fields)
 					wagon.show_wagon_properties({id=uid}, pname)
 				end
 			end
+			return true
 		end
 		uid=string.match(formname, "^advtrains_bordcom_(.+)$")
 		if uid then
-			for _,wagon in pairs(minetest.luaentities) do
-				if wagon.is_wagon and wagon.initialized and wagon.id==uid then
-					wagon:handle_bordcom_fields(player:get_player_name(), formname, fields)
-				end
+			local wagon = advtrains.get_wagon_entity(uid)
+			if wagon then
+				wagon:handle_bordcom_fields(player:get_player_name(), formname, fields)
 			end
+			return true
 		end
+
 		uid=string.match(formname, "^advtrains_inv_(.+)$")
 		if uid then
 			local pname=player:get_player_name()
 			local data = advtrains.wagons[uid]
 			if fields.prop and data.owner==pname then
-				for _,wagon in pairs(minetest.luaentities) do
-					if wagon.is_wagon and wagon.initialized and wagon.id==uid and data.owner==pname then
-						wagon:show_wagon_properties(pname)
-						--wagon:handle_bordcom_fields(player:get_player_name(), formname, fields)
-					end
+				local wagon = advtrains.get_wagon_entity(uid)
+				if wagon then
+					wagon:show_wagon_properties(pname)
+					--wagon:handle_bordcom_fields(player:get_player_name(), formname, fields)
 				end
 			end
+			return true
 		end
 end)
+
 function wagon:seating_from_key_helper(pname, fields, no)
 	local data = advtrains.wagons[self.id]
 	local sgr=self.seats[no].group
@@ -1255,7 +1279,7 @@ function wagon:seating_from_key_helper(pname, fields, no)
 		minetest.after(0.1, function(pn) self:show_bordcom(pn) end, pname)
 	end
 	if fields.dcwarn then
-		minetest.chat_send_player(pname, attrans("Doors are closed! Use Sneak+rightclick to ignore the closed doors and get off!"))
+		minetest.chat_send_player(pname, attrans("Doors are closed. Use Sneak+rightclick to ignore the closed doors and get off."))
 	end
 	if fields.off then
 		self:get_off(no)
@@ -1264,7 +1288,7 @@ end
 function wagon:check_seat_group_access(pname, sgr)
 	local data = advtrains.wagons[self.id]
 	if self.seat_groups[sgr].driving_ctrl_access and not (advtrains.check_driving_couple_protection(pname, data.owner, data.whitelist)) then
-		return false, "Not allowed to access a driver stand!"
+		return false, attrans("You are not allowed to access the driver stand.")
 	end
 	if self.seat_groups[sgr].driving_ctrl_access then
 		advtrains.log("Drive", pname, self.object:get_pos(), self:train().text_outside)
@@ -1325,11 +1349,33 @@ function advtrains.get_wagon_prototype(data)
 		data.type = data.entity_name
 		data.entity_name = nil
 	end
-	if not wt or not advtrains.wagon_prototypes[wt] then
-		atwarn("Unable to load wagon type",wt,", using placeholder")
-		wt="advtrains:wagon_placeholder"
+	local rt, proto = advtrains.resolve_wagon_alias(wt)
+	if not rt then
+		--atwarn("Unable to load wagon type",wt,", using placeholder")
+		rt = "advtrains:wagon_placeholder"
+		proto = advtrains.wagon_prototypes[rt]
+	end
+	return rt, proto
+end
+
+function advtrains.register_wagon_alias(src, dst)
+	advtrains.wagon_alias[src] = dst
+end
+
+local function recursive_resolve_alias(name, seen)
+	local prototype = rawget(advtrains.wagon_prototypes, name)
+	if prototype then
+		return name, prototype
+	end
+	local resolved = advtrains.wagon_alias[name]
+	if resolved and not seen[resolved] then
+		seen[name] = true
+		return recursive_resolve_alias(resolved, seen)
 	end
-	return wt, advtrains.wagon_prototypes[wt]
+end
+
+function advtrains.resolve_wagon_alias(name)
+	return recursive_resolve_alias(name, {})
 end
 
 function advtrains.standard_inventory_formspec(self, pname, invname)
@@ -1394,15 +1440,25 @@ function advtrains.register_wagon(sysname_p, prototype, desc, inv_img, nincreati
 		groups = wagon_groups,
 
 		on_place = function(itemstack, placer, pointed_thing)
-				if not pointed_thing.type == "node" then
+				if pointed_thing.type ~= "node" then
 					return
 				end
+
+				local pos = pointed_thing.under
+				local node = minetest.get_node(pos)
+				local pointed_def = minetest.registered_nodes[node.name]
+				if pointed_def and pointed_def.on_rightclick then
+					local controls = placer:get_player_control()
+					if not controls.sneak then
+						return pointed_def.on_rightclick(pos, node, placer, itemstack, pointed_thing)
+					end
+				end
+
 				local pname = placer:get_player_name()
 
-				local node=minetest.get_node_or_nil(pointed_thing.under)
-				if not node then atprint("[advtrains]Ignore at placer position") return itemstack end
+				if node.name == "ignore" then atprint("[advtrains]Ignore at placer position") return itemstack end
 				local nodename=node.name
-				if(not advtrains.is_track_and_drives_on(nodename, prototype.drives_on)) then
+				if(not advtrains.is_track(nodename)) then
 					atprint("no track here, not placing.")
 					return itemstack
 				end
@@ -1410,7 +1466,7 @@ function advtrains.register_wagon(sysname_p, prototype, desc, inv_img, nincreati
 					minetest.chat_send_player(pname, attrans("You don't have the train_operator privilege."))
 					return itemstack
 				end
-				if not minetest.check_player_privs(placer, {train_admin = true }) and minetest.is_protected(pointed_thing.under, placer:get_player_name()) then
+				if not minetest.check_player_privs(placer, {train_admin = true }) and minetest.is_protected(pos, placer:get_player_name()) then
 					return itemstack
 				end
 				local tconns=advtrains.get_track_connections(node.name, node.param2)
@@ -1425,7 +1481,7 @@ function advtrains.register_wagon(sysname_p, prototype, desc, inv_img, nincreati
 				
 				local wid = advtrains.create_wagon(sysname, pname)
 				
-				local id=advtrains.create_new_train_at(pointed_thing.under, plconnid, 0, {wid})
+				local id=advtrains.create_new_train_at(pos, plconnid, 0, {wid})
 				
 				if not advtrains.is_creative(pname) then
 					itemstack:take_item()
@@ -1442,7 +1498,6 @@ advtrains.register_wagon("advtrains:wagon_placeholder", {
 	collisionbox = {-0.3,-0.3,-0.3, 0.3,0.3,0.3},
 	visual_size = {x=0.7, y=0.7},
 	initial_sprite_basepos = {x=0, y=0},
-	drives_on = advtrains.all_tracktypes,
 	max_speed = 5,
 	seats = {
 	},
@@ -1451,5 +1506,90 @@ advtrains.register_wagon("advtrains:wagon_placeholder", {
 	assign_to_seat_group = {},
 	wagon_span=1,
 	drops={},
-}, attrans("Wagon placeholder"), "advtrains_wagon_placeholder.png", true)
+}, "Wagon placeholder", "advtrains_wagon_placeholder.png", true)
 
+
+
+-- Helper function to retrieve the wagon at a certain position in a train, given its train ID and the desired index within that train's path
+--
+-- Returns: wagon_num, wagon_id, wagon_data, offset_from_center
+-- wagon_num: The n'th wagon in the train (index into "trainparts" table)
+-- wagon_id: The wagon ID. Obtain wagon data from advtrains.wagons[wagon_id], and subsequently the wagon prototype via advtrains.get_wagon_prototype(data)
+-- offset_from_center: The offset (an absolute distance value) from the center point of the wagon. Positive is towards the end of the train, negative towards the start. (note that this is inverse to the counting direction of the index!)
+--
+--[[ To get the wagon standing at a certain world position, you first need to retrieve the index via the occupation table, as follows:
+	local trains = advtrains.occ.get_trains_at(pos)
+	for train_id, index in pairs(trains) do
+		local wagon_num, wagon_id, wagon_data, offset_from_center = advtrains.get_wagon_at_index(train_id, index)
+		if wagon_num then
+			...
+		end
+	end
+]]--
+function advtrains.get_wagon_at_index(train_id, w_index)
+	local train = advtrains.trains[train_id]
+	if not train then error("Passed train id "..train_id.." doesnt exist") end
+	-- ensure init - always required
+	advtrains.train_ensure_init(train_id, train)
+	-- Use path dist to determine the offset from the start of the train
+	local dstart = advtrains.path_get_path_dist_fractional(train, train.index)
+	local dtarget = advtrains.path_get_path_dist_fractional(train, w_index)
+	local dist_from_start = dstart - dtarget -- NOTE: dist_from_start is supposed to be positive, but dtarget will be smaller than dstart
+	-- if dist_from_start is <0, we are outside of train
+	if dist_from_start < 0 then
+		return nil
+	end
+	-- scan over wagons to see if dist_from_start falls into its window
+	local start_pos = 0
+	local center_pos
+	local end_pos
+	local i = 1
+	while train.trainparts[i] do
+		local w_id = train.trainparts[i]
+		-- get wagon prototype to retrieve wagon span
+		local wdata = advtrains.wagons[w_id]
+		if wdata then
+			local wtype, wproto = advtrains.get_wagon_prototype(wdata)
+			local wagon_span = wproto.wagon_span
+			-- determine center and end pos
+			center_pos = start_pos + wagon_span
+			end_pos = center_pos + wagon_span
+			if start_pos <= dist_from_start and dist_from_start < end_pos then
+				-- Found the correct wagon in the train!
+				local offset_from_center = dist_from_start - center_pos
+				return i, w_id, wdata, offset_from_center
+			end
+			-- go on
+			start_pos = end_pos
+		else
+			error("Wagon "..w_id.." from train "..train_id.." doesnt exist!")
+		end
+		i = i + 1
+	end
+	-- nothing found, dist must be further back
+	return nil
+end
+
+function advtrains.get_wagon_entity(wagon_id)
+	if not advtrains.wagons[wagon_id] then return end
+	local object = advtrains.wagon_objects[wagon_id]
+	if object then
+		return object:get_luaentity()
+	end
+end
+
+function advtrains.next_wagon_entity_in_train(train, i)
+	local wagon_id = train.trainparts[i + 1]
+	if wagon_id then
+		local wagon = advtrains.get_wagon_entity(wagon_id)
+		if wagon then
+			return i + 1, wagon
+		end
+	end
+end
+
+function advtrains.wagon_entity_pairs_in_train(train_id)
+	local train = advtrains.trains[train_id]
+	if not train then return function() end end
+	return advtrains.next_wagon_entity_in_train, train, 0
+end
diff --git a/advtrains_interlocking/README.md b/advtrains_interlocking/README.md
new file mode 100644
index 0000000..d4a2699
--- /dev/null
+++ b/advtrains_interlocking/README.md
@@ -0,0 +1,85 @@
+# Interlocking for Advtrains
+
+The `advtrains_interlocking` mod provides various interlocking and signaling features for Advtrains.
+
+## Signal aspect tables
+
+Signal aspects are represented using tables with the following (optional) fields:
+
+* `main`: The main signal aspect. It provides information on the permitted speed after passing the signal.
+* `dst`: The distant signal aspect. It provides information on the permitted speed after passing the next signal.
+* `shunt`: Whether the train may proceed in shunt mode and, if the main aspect is danger, proceed in shunt mode.
+* `proceed_as_main`: Whether the train should exit shunt mode when proceeding.
+* `group`: The name of the signal group.
+* `name`: The name of the signal aspect.
+
+The `main` and `dst` fields may be:
+
+* An positive number indicating the permitted speed,
+* The number 0, indicating that the train should expect to stop at the current signal (or, for the `dst` field, the next signal),
+* The number -1, indicating that the train can proceed (or, for the `dst` field, expect to proceed) at maximum speed,
+* The constant `false`, indicating no change to the speed restriction, or
+* The constant `nil`, indicating that the default value for the name aspect (if present) is used. If no valid signal aspect is named, or the signal aspect does not provide a default value, the value is assumed to be `false`.
+
+### Node definitions
+
+Signals should belong the following node groups:
+
+* `advtrains_signal`: `1` for static signals, `2` for signals with variable aspects.
+* `save_in_at_nodedb`: This should be set to `1` to make sure that Advtrains always has access to the signal.
+* `not_blocking_trains`: Setting this to `1` prevents trains from colliding with the signal. Setting this is not necessary, but recommended.
+
+The node definition should contain an `advtrains` field.
+
+The `advtrains` field of the node definition should contain a `supported_aspects` table for signals with variable aspects.
+
+The `supported_aspects` table should contain the following fields:
+
+* `main`: A list of values supported for the main aspect.
+* `dst`: A list of values supported for the distant aspect.
+* `shunt`: The value for the `shunt` field of the signal aspect or `nil` if the value is variable.
+* `proceed_as_main`: The value for the `proceed_as_main` field of the signal aspect.
+* `group`: The name of the signal group.
+* `name`: A list of supported (named) aspects.
+* `dst_shift`: The phase shift for distant/repeater signals. This field should not be set for main signals.
+
+The `advtrains` field of the node definition should contain a `get_aspect` function. This function is given the position of the signal and the node at the position. It should return the signal aspect table or, in the case of type 2 signals, the name of the signal aspect.
+
+For signals with variable aspects, a corresponding `set_aspect` function should also be defined. This function is given the position of the signal, the node at the position, and the new aspect. The new aspect is not guaranteed to be supported by the signal itself.
+
+Signals should also have the following callbacks set:
+
+* `on_rightclick` should be set to `advtrains.interlocking.signal_rc_handler`
+* `can_dig` should be set to `advtrains.interlocking.signal_can_dig`
+* `after_dig_node` should be set to `advtrains.interlocking.signal_after_dig`
+
+Alternatively, custom callbacks should call the respective functions.
+
+## Signal groups
+
+Signals may belong to signal groups are registered using `advtrains.interlocking.aspect.register_group`.
+
+Signal group definitions include the following fields:
+
+* `name`: The internal name of the signal group. It is recommended to use the mod name as a prefix to avoid name collisions.
+* `label`: The description of the signal group.
+* `aspects`: A table of signal aspects. Entries with string indices define the signal aspect with the name. Entries with numeric indices (starting from 1, counting upward) contain a list of corresponding aspect names (the first entry is preferred) and are mainly used for routing, where larger indices indicate that the signal with the aspect is closer to the signal with the "danger" (or similar) aspect.
+
+Each aspect in the signal group definition table should contain the following fields:
+
+* `label`: The description of the signal aspect.
+* `main`, `shunt`, `proceed_as_main`: The default values for the aspect. Note that the `dst` field has no default value as it is automatically adjusted.
+
+## Notes
+
+It is allowed to provide other methods of setting the signal aspect. However:
+
+* These changes are ignored by the routesetting system.
+* Please call `advtrains.interlocking.signal_readjust_aspect` after the signal aspect has changed.
+
+## Examples
+An example of speed signals can be found in `advtrains_signals_ks`, which provides a subset of German signals.
+
+An example of route signals can be found in `advtrains_signals_japan`, which provides a subset of Japanese signals.
+
+The mods mentioned above are also used for demonstation purposes and can also be used for testing.
diff --git a/advtrains_interlocking/approach.lua b/advtrains_interlocking/approach.lua
index eecf09a..eaf0248 100644
--- a/advtrains_interlocking/approach.lua
+++ b/advtrains_interlocking/approach.lua
@@ -64,10 +64,7 @@ advtrains.tnc_register_on_approach(function(pos, id, train, index, has_entered,
 	-- resetting the path does not matter to the set route and ARS doesn't need to be called again.
 	if spos and ars_enabled then
 		--atdebug(id,"IL Spos (ARS)",spos,asp)
-		local sigd = il.db.get_sigd_for_signal(spos)
-		if sigd then
-			il.ars_check(sigd, train)
-		end
+		il.ars_check(spos, train)
 	end
 	--atdebug("trav: ",pos, cn, asp, spos, "travsht=", lzb.travsht)
 	local lspd
diff --git a/advtrains_interlocking/ars.lua b/advtrains_interlocking/ars.lua
index 4f50df9..eb10497 100644
--- a/advtrains_interlocking/ars.lua
+++ b/advtrains_interlocking/ars.lua
@@ -52,7 +52,7 @@ function il.ars_to_text(arstab)
 end
 
 function il.text_to_ars(t)
-	if t=="" then
+	if not string.match(t, "%S+") then
 		return nil
 	elseif t=="*" then
 		return {default=true}
@@ -129,29 +129,49 @@ function il.ars_check_rule_match(ars, train)
 		return nil
 end
 
-function advtrains.interlocking.ars_check(sigd, train)
-	local tcbs = il.db.get_tcbs(sigd)
-	if not tcbs or not tcbs.routes then return end
-	
-	if tcbs.ars_disabled or tcbs.ars_ignore_next then
-		-- No-ARS mode of signal.
-		-- ignore...
-		-- Note: ars_ignore_next is set by signalling formspec when route is cancelled
-		tcbs.ars_ignore_next = nil
-		return
-	end
-	
-	if tcbs.routeset then
-		-- ARS is not in effect when a route is already set
-		-- just "punch" routesetting, just in case callback got lost.
-		minetest.after(0, il.route.update_route, sigd, tcbs, nil, nil)
-		return
+function advtrains.interlocking.ars_check(signalpos, train, trig_from_dst)
+	-- check for distant signal
+	-- this whole check must be delayed until after the route setting has taken place, 
+	-- because before that the distant signal is yet unknown
+	if not trig_from_dst then
+		minetest.after(0.5, function()
+			-- does signal have dst?
+			local _, remote = il.signal.get_aspect(signalpos)
+			if remote then
+				advtrains.interlocking.ars_check(remote, train, true)
+			end
+		end)
 	end
-	
-	local rteid = find_rtematch(tcbs.routes, train)
-	if rteid then
-		--delay routesetting, it should not occur inside train step
-		-- using after here is OK because that gets called on every path recalculation
-		minetest.after(0, il.route.update_route, sigd, tcbs, rteid, nil)
+
+	local sigd = il.db.get_sigd_for_signal(signalpos)
+	local tcbs = sigd and il.db.get_tcbs(sigd)
+	-- trigger ARS on this signal
+	if tcbs and tcbs.routes then
+		
+		if tcbs.ars_disabled or tcbs.ars_ignore_next then
+			-- No-ARS mode of signal.
+			-- ignore...
+			-- Note: ars_ignore_next is set by signalling formspec when route is cancelled
+			tcbs.ars_ignore_next = nil
+			return
+		end
+		if trig_from_dst and tcbs.no_dst_ars_trig then
+			-- signal not to be triggered from distant
+			return
+		end
+		
+		if tcbs.routeset then
+			-- ARS is not in effect when a route is already set
+			-- just "punch" routesetting, just in case callback got lost.
+			minetest.after(0, il.route.update_route, sigd, tcbs, nil, nil)
+			return
+		end
+		
+		local rteid = find_rtematch(tcbs.routes, train)
+		if rteid then
+			--delay routesetting, it should not occur inside train step
+			-- using after here is OK because that gets called on every path recalculation
+			minetest.after(0, il.route.update_route, sigd, tcbs, rteid, nil)
+		end
 	end
 end
diff --git a/advtrains_interlocking/autonaming.lua b/advtrains_interlocking/autonaming.lua
new file mode 100644
index 0000000..f88ccbd
--- /dev/null
+++ b/advtrains_interlocking/autonaming.lua
@@ -0,0 +1,69 @@
+-- autonaming.lua
+-- Automatically set names of signals (and maybe track sections) based on numbering
+
+
+local function find_highest_count(prefix)
+	local cnt = 0
+	local pattern = "^"..prefix.."(%d+)$"
+	local alltcb = advtrains.interlocking.db.get_all_tcb()
+	for _,tcb in pairs(alltcb) do
+		for _,tcbs in pairs(tcb) do
+			if tcbs.signal_name then
+				local mnum = string.match(tcbs.signal_name, pattern)
+				if mnum then
+					local n = tonumber(mnum)
+					if n and n > cnt then
+						cnt = n
+					end
+				end
+			end
+		end
+	end
+	return cnt
+end
+
+-- { pname = { prefix = "FOO", count = 7 } }
+local player_prefix_info = {}
+
+function advtrains.interlocking.set_autoname_prefix(pname, prefix)
+	if prefix and #prefix>0 then
+		-- check that it is valid
+		if not string.match(prefix,"[A-Za-z_]+") then
+			return false, "Illegal prefix, only letters and _ allowed"
+		end
+		-- scan database for this prefix to find out the highest count
+		local count = find_highest_count(prefix)
+		player_prefix_info[pname] = { prefix = prefix, count = count}
+		return true, "Prefix set, next signal name will be: ".. advtrains.interlocking.get_next_autoname(pname, true)
+	else
+		player_prefix_info[pname] = nil
+		return true, "Prefix unset, signals are not auto-named for you!"
+	end
+end
+
+function advtrains.interlocking.get_next_autoname(pname, no_increment)
+	local pi = player_prefix_info[pname]
+	if pi then
+		local name = pi.prefix..(pi.count+1)
+		if not no_increment then pi.count = pi.count+1 end
+		return name
+	else
+		return nil
+	end
+end
+
+function advtrains.interlocking.add_autoname_to_tcbs(tcbs, pname)
+	if not tcbs or not pname then return end
+	if tcbs.signal_name then return end -- name already set
+	
+	tcbs.signal_name = advtrains.interlocking.get_next_autoname(pname)
+end
+
+minetest.register_chatcommand("at_nameprefix",
+	{
+		params = "<prefix>",
+		description = "Sets the current prefix for automatically naming interlocking components. Example: '/at_nameprefix TEST' - signals will be named TEST1, TEST2 and so on",
+		privs = {interlocking = true},
+		func = advtrains.interlocking.set_autoname_prefix,
+})
+
diff --git a/advtrains_interlocking/database.lua b/advtrains_interlocking/database.lua
index a362296..844d350 100644
--- a/advtrains_interlocking/database.lua
+++ b/advtrains_interlocking/database.lua
@@ -2,71 +2,19 @@
 -- saving the location of TCB's, their neighbors and their state
 --[[
 
-== THIS COMMENT IS PARTIALLY INCORRECT AND OUTDATED! ==
-
-The interlocking system is based on track circuits.
-Track circuit breaks must be manually set by the user. Signals must be assigned to track circuit breaks and to a direction(connid).
-To simplify the whole system, there is no overlap.
-== Trains ==
-Trains always occupy certain track circuits. These are shown red in the signalbox view (TRAIN occupation entry).
-== Database storage ==
-The things that are actually saved are the Track Circuit Breaks. Each TCB holds a list of the TCBs that are adjacent in each direction.
-TC occupation/state is then saved inside each (TCB,Direction) and held in sync across all TCBs adjacent to this one. If something should not be in sync,
-all entries are merged to perform the most restrictive setup.
-== Traverser function ==
-To determine and update the list of neighboring TCBs, we need a traverser function.
-It will start at one TCB in a specified direction (connid) and use get_adjacent_rail to crawl along the track. When encountering a turnout or a crossing,
-it needs to branch(call itself recursively) to find all required TCBs. Those found TCBs are then saved in a list as tuples (TCB,Dir)
-In the last step, they exchange their neighbors.
-== TC states ==
-A track circuit does not have a state as such, but has more or less a list of "reservations"
-type can be one of these:
-TRAIN See Trains obove
-ROUTE Route set from a signal, but no train has yet passed that signal.
-Not implemented (see note by reversible): OWNED - former ROUTE segments that a train has begun passing (train_id assigned)
-		  - Space behind a train up to the next signal, when a TC is set as REVERSIBLE
-Certain TCs can be marked as "allow call-on".
-== Route setting: ==
-Routes are set from a signal (the entry signal) to another signal facing the same direction (the exit signal)
-Remember that signals are assigned to a TCB and a connid.
-Whenever this is done, the following track circuits are set "reserved" by the train by saving the entry signal's ID:
-- all TCs on the direct way of the route - set as ROUTE
-Route setting fails whenever any TC that we want to set ROUTE to is already set ROUTE or TRAIN from another signal (except call-on, see below)
-Apart from this, we need to set turnouts
-- Turnouts on the track are set held as ROUTE
-- Turnouts that purpose as flank protection are set held as FLANK (NOTE: left as an idea for later, because it's not clear how to do this properly without an engineer)
-Note: In SimSig, it is possible to set a route into an still occupied section on the victoria line sim. (at the depot exit at seven sisters), although
-	there are still segments set ahead of the first train passing, remaining from another route.
-	Because our system will be able to remember "requested routes" and set them automatically once ready, this is not necessary here.
-== Call-On/Multiple Trains ==
-It will be necessary to join and split trains using call-on routes. A call-on route may be set when:
-- there are no ROUTE reservations
-- there are TRAIN reservations only inside TCs that have "allow call-on" set
-== TC Properties ==
-Note: Reversible property will not be implemented, assuming everything as non-rev.
-This is sufficient to cover all use cases, and is done this way in reality.
-	REVERSIBLE - Whether trains are allowed to reverse while on track circuit
-	This property is supposed to be set for station tracks, where there is a signal at each end, and for sidings.
-	It should in no case be set for TCs covering turnouts, or for main running lines.
-	When a TC is not set as reversible, the OWNED status is cleared from the TC right after the train left it,
-	to allow other trains to pass it.
-	If it is set reversible, interlocking will keep the OWNED state behind the train up to the next signal, clearing it
-	as soon as the train passes another signal or enters a non-reversible section.
-CALL_ON_ALLOWED - Whether this TC being blocked (TRAIN or ROUTE) does not prevent shunt routes being set through this TC
-== More notes ==
-- It may not be possible to switch turnouts when their TC has any state entry
-
 == Route releasing (TORR) ==
 A train passing through a route happens as follows:
 Route set from entry to exit signal
-Train passes entry signal and enters first TC past the signal
--> Route from signal cleared (TCs remain locked)
--> ROUTE status of first TC past signal cleared
+Train passes entry signal and enters first TS past the signal
+-> Route from signal cleared (TSs remain locked)
+-> 'route' status of first TS past signal cleared
+-> 'route_post' (holding the turnout locks) remains set
 Train continues along the route.
-Whenever train leaves a TC
+Whenever train leaves a TS
 -> Clearing any routes set from this TC outward recursively - see "Reversing problem"
-Whenever train enters a TC
--> Clear route status from the just entered TC
+-> Free turnout locks and clear 'route_post'
+Whenever train enters a TS
+-> Clear route status from the just entered TC (but not route_post)
 Note that this prohibits by design that the train clears the route ahead of it.
 == Reversing Problem ==
 Encountered at the Royston simulation in SimSig. It is solved there by imposing a time limit on the set route. Call-on routes can somehow be set anyway.
@@ -89,6 +37,22 @@ Another case of this:
 The / here is a non-interlocked turnout (to a non-frequently used siding). For some reason, there is no exit node there,
 so the route is set to the signal at the right end. The train is taking the exit to the siding and frees the TC, without ever
 having touched the right TC.
+
+
+== Terminology / Variable Names ==
+
+"tcb" : A TCB table (as in track_circuit_breaks)
+"tcbs" : One side of a tcb (that is tcb == {[1] = tcbs, [2] = tcbs})
+"sigd" : A table of format {p=<position>, s=<side aka connid>} by which a "tcbs" is uniqely identified.
+
+== Section Autorepair & Turnout Cache ==
+
+As fundamental part of reworked route programming mechanism, Track Section objects become weak now. They are created and destroyed on demand.
+ildb.repair_tcb automatically checks all nearby sections for issues and repairs them automatically.
+
+Also the database now holds a cache of the turnouts in the section and their position for all possible driving paths.
+Every time a repair operation takes place, and on every track edit operation, the affected sections need to have their cache updated.
+
 ]]--
 
 local TRAVERSER_LIMIT = 1000
@@ -111,7 +75,45 @@ advtrains.interlocking.npr_rails = {}
 function ildb.load(data)
 	if not data then return end
 	if data.tcbs then
-		track_circuit_breaks = data.tcbs
+		if data.tcbpts_conversion_applied then
+			track_circuit_breaks = data.tcbs
+		else
+			-- Convert legacy pos_to_string tcbs to new advtrains.encode_pos position strings
+			for pts, tcb in pairs(data.tcbs) do
+				local pos = minetest.string_to_pos(pts)
+				if pos then
+					-- that was a pos_to_string
+					local epos = advtrains.encode_pos(pos)
+					atdebug("ILDB converting TCB position format",pts,"->",epos)
+					track_circuit_breaks[epos] = tcb
+				else
+					-- keep entry, it is already new
+					track_circuit_breaks[pts] = tcb
+				end
+				-- convert the routes.[].locks table keys
+				for t_side,tcbs in pairs(tcb) do
+					if tcbs.routes then
+						for t_rnum,route in pairs(tcbs.routes) do
+							for t_rsnm,rseg in ipairs(route) do
+								local locks_n = {}
+								for lpts,state in pairs(rseg.locks) do
+									local lpos = minetest.string_to_pos(lpts)
+									if lpos then
+										local epos = advtrains.encode_pos(lpos)
+										atdebug("ILDB converting tcb",pts,"side",t_side,"route",t_rnum,"lock position format",lpts,"->",epos)
+										locks_n[epos] = state
+									else
+										-- already correct format
+										locks_n[lpts] = state
+									end
+								end
+								rseg.locks = locks_n
+							end
+						end
+					end
+				end
+			end
+		end
 	end
 	if data.ts then
 		track_sections = data.ts
@@ -120,7 +122,23 @@ function ildb.load(data)
 		signal_assignments = data.signalass
 	end
 	if data.rs_locks then
-		advtrains.interlocking.route.rte_locks = data.rs_locks
+		if data.tcbpts_conversion_applied then
+			advtrains.interlocking.route.rte_locks = data.rs_locks
+		else
+			advtrains.interlocking.route.rte_locks = {}
+			for pts, lta in pairs(data.rs_locks) do
+				local pos = minetest.string_to_pos(pts)
+				if pos then
+					-- that was a pos_to_string
+					local epos = advtrains.encode_pos(pos)
+					atdebug("ILDB converting Route Lock position format",pts,"->",epos)
+					advtrains.interlocking.route.rte_locks[epos] = lta
+				else
+					-- keep entry, it is already new
+					advtrains.interlocking.route.rte_locks[pts] = lta
+				end
+			end
+		end
 	end
 	if data.rs_callbacks then
 		advtrains.interlocking.route.rte_callbacks = data.rs_callbacks
@@ -132,6 +150,9 @@ function ildb.load(data)
 		advtrains.interlocking.npr_rails = data.npr_rails
 	end
 	
+	-- let signal_api load data
+	advtrains.interlocking.signal.load(data)
+	
 	--COMPATIBILITY to Signal aspect format
 	-- TODO remove in time...
 	for pts,tcb in pairs(track_circuit_breaks) do
@@ -165,7 +186,7 @@ function ildb.load(data)
 end
 
 function ildb.save()
-	return {
+	local data = {
 		tcbs = track_circuit_breaks,
 		ts=track_sections,
 		signalass = signal_assignments,
@@ -173,7 +194,10 @@ function ildb.save()
 		rs_callbacks = advtrains.interlocking.route.rte_callbacks,
 		influence_points = influence_points,
 		npr_rails = advtrains.interlocking.npr_rails,
+		tcbpts_conversion_applied = true, -- remark that legacy pos conversion has taken place
 	}
+	advtrains.interlocking.signal.save(data)
+	return data
 end
 
 --
@@ -183,6 +207,9 @@ TCB data structure
 -- This is the "A" side of the TCB
 [1] = { -- Variant: with adjacent TCs.
 	ts_id = <id> -- ID of the assigned track section
+	xlink = <other sigd> -- If two sections of track are not physically joined but must function as one TS (e.g. knights move crossing), a bidirectional link can be added with exactly one other TCB.
+	-- TS search will behave as if these two TCBs were physically connected.
+	
 	signal = <pos> -- optional: when set, routes can be set from this tcb/direction and signal
 	-- aspect will be set accordingly.
 	routeset = <index in routes> -- Route set from this signal. This is the entry that is cleared once
@@ -195,20 +222,63 @@ TCB data structure
 	signal_name = <string> -- The human-readable name of the signal, only for documenting purposes
 	routes = { <route definition> } -- a collection of routes from this signal
 	route_auto = <boolean> -- When set, we will automatically re-set the route (designated by routeset)
+	
+	auto_block_signal_mode = <boolean> -- Simplified mode for simple block signals:
+	-- Signal has only one route which is constantly re-set (route_auto is implied)
+	-- Supposed to be used when only a single track section is ahead and it directly ends at the next signal
+	-- UI only offers to enable or disable the signal
+	-- ARS is implicitly disabled on the signal
 },
 -- This is the "B" side of the TCB
 [2] = { -- Variant: end of track-circuited area (initial state of TC)
 	ts_id = nil, -- this is the indication for end_of_interlocking
-	section_free = <boolean>, --this can be set by an exit node via mesecons or atlatc, 
-	-- or from the tc formspec.
 }
 }
 
+Route definition
+routes = {
+	[i] = {
+		-- one table for each track section on the route
+		-- Note that the section ID is implicitly inferred from the TCB
+		1 = {
+			locks = { -- component locks for this section of the route.
+				800080008000 = st
+			}
+			next = S[(-23,9,0)/2] -- the start TCB of the next route segment (pointing forward)
+			-- Signal info: relates to the signal at the start of this section:
+			main_aspect = "_free" -- The main aspect that the route start signal is to show
+			assign_dst = false  -- Whether to assign distant signal (affects only the signal at the start of the route)
+								-- false: start signal does not set distant signal (the default), for long blocks
+								-- it is assumed that the next main signal will have its own distant sig
+								-- true: start signal sets distant signal to the next signal on the route with route_role "main" (typically the end signal)
+								-- for short blocks where end signal doesn't have its own distant sig
+			call_on = false	-- if true, when this route is set, section is allowed to be occupied by a train (but it must not have a route set in)
+		}
+		2 = {
+			locks = {}
+			-- if next is omitted, then there is no final TCB (e.g. a buffer)
+		}
+		name = "<the route name>"
+		ars = { <ARS rule definition table> }
+		use_rscache = false -- if true, the track section's rs_cache will be used to set locks in addition to the locks table
+							-- this is disabled for legacy routes, but enabled for all new routes by default
+		default_autoworking = false -- if true, when route is set autoworking will be by default on. Used for Blocksignal mode
+	}
+}
+
 Track section
 [id] = {
 	name = "Some human-readable name"
 	tc_breaks = { <signal specifier>,... } -- Bounding TC's (signal specifiers)
-	-- Can be direct ends (auto-detected), conflicting routes or TCBs that are too far away from each other
+	rs_cache = { [startTcbPosEnc] = { [endTcbPosEnc] = { [componentPosEnc] = "state" } } }
+	-- Saves the turnout states that need to be locked when a route is set from tcb#x to tcb#y
+	-- e.g. "800080008005" = { "800080007EEA" = { "800080008000" = "st" } }
+	--       start TCB           end TCB             switch pos
+	-- Recalculated on every change via update_rs_cache
+	-- Note that the tcb side number is not saved because it is unnecessary
+	fixed_locks = { "800080008000" = "st" }
+	-- table of fixed locks to be set for all routes thru this section (e.g. level crossings
+	
 	route = {
 		origin = <signal>,  -- route origin
 		entry = <sigd>,     -- supposed train entry point
@@ -224,7 +294,9 @@ Track section
 	-- first says whether to clear the routesetting status from the origin signal.
 	-- locks contains the positions where locks are held by this ts.
 	-- 'route' is cleared when train enters the section, while 'route_post' cleared when train leaves section.
+	
 	trains = {<id>, ...} -- Set whenever a train (or more) reside in this TC
+	-- Note: The same train ID may be contained in this mapping multiple times, when it has entered the section in two different places.
 }
 
 
@@ -237,24 +309,13 @@ signal_assignments = {
 }
 ]]
 
+-- Maximum scan length for track iterator
+local TS_MAX_SCAN = 1000
 
---
-function ildb.create_tcb(pos)
-	local new_tcb = {
-		[1] = {},
-		[2] = {},
-	}
-	local pts = advtrains.roundfloorpts(pos)
-	if not track_circuit_breaks[pts] then
-		track_circuit_breaks[pts] = new_tcb
-		return true
-	else
-		return false
-	end
-end
+-- basic functions
 
 function ildb.get_tcb(pos)
-	local pts = advtrains.roundfloorpts(pos)
+	local pts = advtrains.encode_pos(pos)
 	return track_circuit_breaks[pts]
 end
 
@@ -264,227 +325,635 @@ function ildb.get_tcbs(sigd)
 	return tcb[sigd.s]
 end
 
-
-function ildb.create_ts(sigd)
-	local tcbs = ildb.get_tcbs(sigd)
-	local id = advtrains.random_id()
-	
-	while track_sections[id] do
-		id = advtrains.random_id()
-	end
-	
-	track_sections[id] = {
-		name = tostring(id),
-		tc_breaks = { sigd }
-	}
-	tcbs.ts_id = id
-end
-
 function ildb.get_ts(id)
 	return track_sections[id]
 end
 
+-- retrieve full tables. Please use only read-only!
+function ildb.get_all_tcb()
+	return track_circuit_breaks
+end
+function ildb.get_all_ts()
+	return track_sections
+end
 
-
--- various helper functions handling sigd's
-local sigd_equal = advtrains.interlocking.sigd_equal
-local function insert_sigd_nodouble(list, sigd)
-	for idx, cmp in pairs(list) do
-		if sigd_equal(sigd, cmp) then
-			return
-		end
+function tsrepair_notify(notify_pname, ...)
+	if notify_pname then
+		minetest.chat_send_player(notify_pname, advtrains.print_concat_table({"TS Check:",...}))
 	end
-	table.insert(list, sigd)
 end
 
-
--- This function will actually handle the node that is in connid direction from the node at pos
--- so, this needs the conns of the node at pos, since these are already calculated
-local function traverser(found_tcbs, pos, conns, connid, count, brk_when_found_n)
-	local adj_pos, adj_connid, conn_idx, nextrail_y, next_conns = advtrains.get_adjacent_rail(pos, conns, connid, advtrains.all_tracktypes)
-	if not adj_pos then
-		--atdebug("Traverser found end-of-track at",pos, connid)
-		return
+-- Checks the consistency of the track section at the given position, attempts to autorepair track sections if they are inconsistent
+-- There are 2 operation modes:
+--		1: pos is NOT a TCB, tcb_connid MUST be nil
+-- 		2: pos is a TCB, tcb_connid MUST be given
+-- @param pos: the position to start from
+-- @param tcb_connid: If provided node is a TCB, the direction in which to search
+-- @param notify_pname: the player to notify about reparations
+-- Returns:
+-- ts_id - the track section that was found
+-- nil - No track section exists
+function ildb.check_and_repair_ts_at_pos(pos, tcb_connid, notify_pname, force_create)
+	--atdebug("check_and_repair_ts_at_pos", pos, tcb_connid)
+	-- check prereqs
+	if ildb.get_tcb(pos) then
+		if not tcb_connid then error("check_and_repair_ts_at_pos: Startpoint is TCB, must provide tcb_connid!") end
+	else
+		-- FIX 2025-01-07: If the checked pos is not a TCB, we always need to search in both directions, otherwise we errorneously split a ts
+		tcb_connid = nil
 	end
-	-- look whether there is a TCB here
-	if #next_conns == 2 then --if not, don't even try!
-		local tcb = ildb.get_tcb(adj_pos)
-		if tcb then
-			-- done with this branch
-			--atdebug("Traverser found tcb at",adj_pos, adj_connid)
-			insert_sigd_nodouble(found_tcbs, {p=adj_pos, s=adj_connid})
-			return
+	-- STEP 1: Ensure that only one section is at this place
+	-- get all TCBs adjacent to this 
+	local all_tcbs = ildb.get_all_tcbs_adjacent(pos, tcb_connid)
+	local first_ts = true
+	local ts_id
+	for _,sigd in ipairs(all_tcbs) do
+		ildb.tcbs_ensure_ts_ref_exists(sigd)
+		local tcbs_ts_id = sigd.tcbs.ts_id
+		if first_ts then
+			-- this one determines
+			ts_id = tcbs_ts_id
+			first_ts = false
+		else
+			-- these must be the same as the first
+			if ts_id ~= tcbs_ts_id then
+				-- inconsistency is found, repair it
+				--atdebug("check_and_repair_ts_at_pos: Inconsistency is found!")
+				tsrepair_notify(notify_pname, "Track section inconsistent here, repairing...")
+				return ildb.repair_ts_merge_all(all_tcbs, force_create, notify_pname)
+				-- Step2 check is no longer necessary since we just created that new section
+			end
 		end
 	end
-	-- recursion abort condition
-	if count > TRAVERSER_LIMIT then
-		--atdebug("Traverser hit counter at",adj_pos, adj_connid)
-		return true
-	end
-	-- continue traversing
-	local counter_hit = false
-	for nconnid, nconn in ipairs(next_conns) do
-		if adj_connid ~= nconnid then
-			counter_hit = counter_hit or traverser(found_tcbs, adj_pos, next_conns, nconnid, count + 1, brk_when_found_n)
-			if brk_when_found_n and #found_tcbs>=brk_when_found_n then
-				break
-			end
+	-- only one found (it is either nil or a ts id)
+	--atdebug("check_and_repair_ts_at_pos: TS consistent id=",ts_id,"")
+	if not ts_id then
+		if force_create and next(all_tcbs) then --ensure at least one tcb is in list
+			return ildb.repair_ts_merge_all(all_tcbs, force_create, notify_pname)
+		else
+			--tsrepair_notify(notify_pname, "No track section found here.")
+			return nil
+			-- All TCBs agreed that there is no section here
 		end
 	end
-	return counter_hit
+	
+	local ts = ildb.get_ts(ts_id)
+	if not ts then
+		-- This branch may never be reached, because ildb.tcbs_ensure_ts_ref_exists(sigd) is already supposed to clear out missing sections
+		error("check_and_repair_ts_at_pos: Resolved to nonexisting section although ildb.tcbs_ensure_ts_ref_exists(sigd) was supposed to prevent this. Panic!")
+	end
+	ildb.purge_ts_tcb_refs(ts_id)
+	-- STEP 2: Ensure that all_tcbs is equal to the track section's TCB list. If there are extra TCBs then the section should be split
+	-- ildb.tcbs_ensure_ts_ref_exists(sigd) has already make sure that all tcbs are found in the ts's tc_breaks list
+	-- That means it is sufficient to compare the LENGTHS of both lists, if one is longer then it is inconsistent
+	if #ts.tc_breaks ~= #all_tcbs then
+		--atdebug("check_and_repair_ts_at_pos: Partition is found!")
+		tsrepair_notify(notify_pname, "Track section partition found, repairing...")
+		return ildb.repair_ts_merge_all(all_tcbs, force_create, notify_pname)
+	end
+	--tsrepair_notify(notify_pname, "Found section", ts.name or ts_id, "here.")
+	ildb.update_rs_cache(ts_id)
+	return ts_id
 end
 
+-- Helper function to prevent duplicates
+local function insert_sigd_if_not_present(tab, sigd)
+	local found = false
+	for _, ssigd in ipairs(tab) do
+		if vector.equals(sigd.p, ssigd.p) and sigd.s==ssigd.s then
+			found = true
+		end
+	end
+	if not found then
+		table.insert(tab, sigd)
+	end
+	return not found
+end
 
-
--- Merges the TS with merge_id into root_id and then deletes merge_id
-local function merge_ts(root_id, merge_id)
-	local rts = ildb.get_ts(root_id)
-	local mts = ildb.get_ts(merge_id)
-	if not mts then return end -- This may be the case when sync_tcb_neighbors
-	-- inserts the same id twice. do nothing.
-	
-	if not ildb.may_modify_ts(rts) then return false end
-	if not ildb.may_modify_ts(mts) then return false end
-	
-	-- cobble together the list of TCBs
-	for _, msigd in ipairs(mts.tc_breaks) do
-		local tcbs = ildb.get_tcbs(msigd)
-		if tcbs then
-			insert_sigd_nodouble(rts.tc_breaks, msigd)
-			tcbs.ts_id = root_id
+-- Starting from a position, search all TCBs that can be reached from this position.
+-- In a non-faulty setup, all of these should have the same track section assigned.
+-- This function does not trigger a repair.
+-- @param inipos: the initial position
+-- @param inidir: the initial direction, or nil to search in all directions
+-- @param per_track_callback: A callback function called with signature (pos, connid, bconnid) for every track encountered
+-- Returns: a list of sigd's describing the TCBs found (sigd's point inward):
+-- 		{p=<pos>, s=<side>, tcbs=<ref to tcbs table>}
+function ildb.get_all_tcbs_adjacent(inipos, inidir, per_track_callback)
+	--atdebug("get_all_tcbs_adjacent: inipos",inipos,"inidir",inidir,"")
+	local found_sigd = {}
+	local ti = advtrains.get_track_iterator(inipos, inidir, TS_MAX_SCAN, true)
+	-- if initial start is TCBS and has xlink, need to add that to the TI
+	local inisi = {p=inipos, s=inidir};
+	local initcbs = ildb.get_tcbs(inisi)
+	if initcbs then
+		ildb.validate_tcb_xlink(inisi, true)
+		if initcbs.xlink then
+			-- adding the tcb will happen when this branch is retrieved again using ti:next_branch()
+			--atdebug("get_all_tcbs_adjacent: Putting xlink Branch for initial node",initcbs.xlink)
+			ti:add_branch(initcbs.xlink.p, initcbs.xlink.s)
 		end
-		advtrains.interlocking.show_tcb_marker(msigd.p)
 	end
-	-- done
-	track_sections[merge_id] = nil
+	local pos, connid, bconnid, tcb
+	while ti:has_next_branch() do
+		pos, connid = ti:next_branch()
+		--atdebug("get_all_tcbs_adjacent: BRANCH: ",pos, connid)
+		bconnid = nil
+		local is_branch_start = true
+		repeat
+			-- callback
+			if per_track_callback then
+				per_track_callback(pos, connid, bconnid)
+			end
+			tcb = ildb.get_tcb(pos)
+			if tcb then
+				local using_connid = bconnid
+				-- found a tcb
+				if is_branch_start then
+					-- A branch cannot be a TCB, as that would imply that it was a turnout/crossing (illegal)
+					-- UNLESS: (a) it is the start point or (b) it was added via xlink
+					-- Then the correct conn to use is connid (pointing forward)
+					--atdebug("get_all_tcbs_adjacent: Inserting TCB at branch start",pos, connid)
+					using_connid = connid
+				end
+				-- add the sigd of this tcb and a reference to the tcb table in it
+				--atdebug("get_all_tcbs_adjacent: Found TCB: ",pos, using_connid, "ts=", tcb[using_connid].ts_id)
+				local si = {p=pos, s=using_connid, tcbs=tcb[using_connid]}
+				-- if xlink exists, add it now (only if we are not in branch start)
+				ildb.validate_tcb_xlink(si, true)
+				if not is_branch_start and si.tcbs.xlink then
+					-- adding the tcb will happen when this branch is retrieved again using ti:next_branch()
+					--atdebug("get_all_tcbs_adjacent: Putting xlink Branch",si.tcbs.xlink)
+					ti:add_branch(si.tcbs.xlink.p, si.tcbs.xlink.s)
+				end
+				insert_sigd_if_not_present(found_sigd, si)
+				if not is_branch_start then
+					break
+				end
+			end
+			pos, connid, bconnid = ti:next_track()
+			is_branch_start = false
+			--atdebug("get_all_tcbs_adjacent: TRACK: ",pos, connid, bconnid)
+		until not pos
+	end
+	return found_sigd
 end
 
-local lntrans = { "A", "B" }
-local function sigd_to_string(sigd)
-	return minetest.pos_to_string(sigd.p).." / "..lntrans[sigd.s]
+-- Called by frontend functions when multiple tcbs's that logically belong to one section have been determined to have different sections
+-- Parameter is the output of ildb.get_all_tcbs_adjacent(pos)
+-- Returns the ID of the track section that results after the merge
+function ildb.repair_ts_merge_all(all_tcbs, force_create, notify_pname)
+	--atdebug("repair_ts_merge_all: Instructed to merge sections of following TCBs:")
+	-- The first loop does the following for each TCBS:
+	-- a) Store the TS ID in the set of TS to update
+	-- b) Set the TS ID to nil, so that the TCBS gets removed from the section
+	local ts_to_update = {}
+	local ts_name_repo = {}
+	local any_ts = false
+	for _,sigd in ipairs(all_tcbs) do
+		local ts_id = sigd.tcbs.ts_id
+		--atdebug(sigd, "ts=", ts_id)
+		if ts_id then
+			local ts = track_sections[ts_id]
+			if ts then
+				any_ts = true
+				ts_to_update[ts_id] = true
+				-- if nonstandard name, store this
+				if ts.name and not string.match(ts.name, "^Section") then
+					ts_name_repo[#ts_name_repo+1] = ts.name
+				end
+			end
+		end
+		sigd.tcbs.ts_id = nil
+	end
+	if not any_ts and not force_create then
+		-- nothing to do at all, just no interlocking. Why were we even called
+		--atdebug("repair_ts_merge_all: No track section present, will not create a new one")
+		return nil
+	end
+	-- Purge every TS in turn. TS's that are now empty will be deleted. TS's that still have TCBs will be kept
+	for ts_id, _ in pairs(ts_to_update) do
+		local remain_ts = ildb.purge_ts_tcb_refs(ts_id)
+	end
+	-- Create a new fresh track section with all the TCBs we have in our collection
+	local new_ts_id, new_ts = ildb.create_ts_from_tcb_list(all_tcbs)
+	tsrepair_notify(notify_pname, "Created track section",new_ts_id,"from",#all_tcbs,"TCBs")
+	return new_ts_id
 end
 
--- Check for near TCBs and connect to their TS if they have one, and syncs their data.
-function ildb.sync_tcb_neighbors(pos, connid)
-	local found_tcbs = { {p = pos, s = connid} }
-	local node_ok, conns, rhe = advtrains.get_rail_info_at(pos, advtrains.all_tracktypes)
-	if not node_ok then
-		atwarn("update_tcb_neighbors but node is NOK: "..minetest.pos_to_string(pos))
-		return
+-- For the specified TS, go through the list of TCBs and purge all TCBs that have no corresponding backreference in their TCBS table.
+-- If the track section ends up empty, it is deleted in this process.
+-- Should the track section still exist after the purge operation, it is returned.
+function ildb.purge_ts_tcb_refs(ts_id)
+	local ts = track_sections[ts_id]
+	if not ts then
+		return nil
 	end
-	
-	--atdebug("Traversing from ",pos, connid)
-	local counter_hit = traverser(found_tcbs, pos, conns, connid, 0)
-	
-	local ts_id
-	local list_eoi = {}
-	local list_ok = {}
-	local list_mismatch = {}
-	local ts_to_merge = {}
-	
-	for idx, sigd in pairs(found_tcbs) do
+	local has_changed = false
+	local i = 1
+	while ts.tc_breaks[i] do
+		-- get TCBS
+		local sigd = ts.tc_breaks[i]
 		local tcbs = ildb.get_tcbs(sigd)
-		if not tcbs.ts_id then
-			--atdebug("Sync: put",sigd_to_string(sigd),"into list_eoi")
-			table.insert(list_eoi, sigd)
-		elseif not ts_id and tcbs.ts_id then
-			if not ildb.get_ts(tcbs.ts_id) then
-				atwarn("Track section database is inconsistent, there's no TS with ID=",tcbs.ts_id)
-				tcbs.ts_id = nil
-				table.insert(list_eoi, sigd)
+		if tcbs then
+			if tcbs.ts_id == ts_id then
+				-- this one is legit
+				i = i+1
 			else
-				--atdebug("Sync: put",sigd_to_string(sigd),"into list_ok")
-				ts_id = tcbs.ts_id
-				table.insert(list_ok, sigd)
+				-- this one is to be purged
+				--atdebug("purge_ts_tcb_refs(",ts_id,"): purging",sigd,"(backreference = ",tcbs.ts_id,")")
+				table.remove(ts.tc_breaks, i)
+				has_changed = true
 			end
-		elseif ts_id and tcbs.ts_id and tcbs.ts_id ~= ts_id then
-			atwarn("Track section database is inconsistent, sections share track!")
-			atwarn("Merging",tcbs.ts_id,"into",ts_id,".")
-			table.insert(list_mismatch, sigd)
-			table.insert(ts_to_merge, tcbs.ts_id)
+		else
+			-- if not tcbs: was anyway an orphan, remove it
+			--atdebug("purge_ts_tcb_refs(",ts_id,"): purging",sigd,"(referred nonexisting TCB)")
+			table.remove(ts.tc_breaks, i)
+			has_changed = true
 		end
 	end
-	if ts_id then
-		local ts = ildb.get_ts(ts_id)
-		for _, sigd in ipairs(list_eoi) do
-			local tcbs = ildb.get_tcbs(sigd)
-			tcbs.ts_id = ts_id
-			table.insert(ts.tc_breaks, sigd)
-			advtrains.interlocking.show_tcb_marker(sigd.p)
-		end
-		for _, mts in ipairs(ts_to_merge) do
-			merge_ts(ts_id, mts)
+	if #ts.tc_breaks == 0 then
+		-- remove the section completely
+		--atdebug("purge_ts_tcb_refs(",ts_id,"): after purging, the section is empty, is being deleted")
+		track_sections[ts_id] = nil
+		return nil
+	else
+		if has_changed then
+			-- needs to update route cache
+			ildb.update_rs_cache(ts_id)
 		end
+		return ts
 	end
 end
 
-function ildb.link_track_sections(merge_id, root_id)
-	if merge_id == root_id then
+-- For the specified TCBS, make sure that the track section referenced by it
+-- (a) exists and
+-- (b) has a backreference to this TCBS stored in its tc_breaks list
+function ildb.tcbs_ensure_ts_ref_exists(sigd)
+	local tcbs = sigd.tcbs or ildb.get_tcbs(sigd)
+	if not tcbs or not tcbs.ts_id then return end
+	local ts = ildb.get_ts(tcbs.ts_id)
+	if not ts then
+		--atdebug("tcbs_ensure_ts_ref_exists(",sigd,"): TS does not exist, setting to nil")
+		-- TS is deleted, clear own ts id
+		tcbs.ts_id = nil
 		return
 	end
-	merge_ts(root_id, merge_id)
+	local did_insert = insert_sigd_if_not_present(ts.tc_breaks, {p=sigd.p, s=sigd.s})
+	if did_insert then
+		--atdebug("tcbs_ensure_ts_ref_exists(",sigd,"): TCBS was missing reference in TS",tcbs.ts_id)
+		ildb.update_rs_cache(tcbs.ts_id)
+	end
 end
 
-function ildb.remove_from_interlocking(sigd)
-	local tcbs = ildb.get_tcbs(sigd)
-	if not ildb.may_modify_tcbs(tcbs) then return false end
+function ildb.create_ts_from_tcb_list(sigd_list)
+	local id = advtrains.random_id(8)
 	
-	if tcbs.ts_id then
-		local tsid = tcbs.ts_id
-		local ts = ildb.get_ts(tsid)
-		if not ts then
-			tcbs.ts_id = nil
-			return true
+	while track_sections[id] do
+		id = advtrains.random_id(8)
+	end
+	--atdebug("create_ts_from_tcb_list: sigd_list=",sigd_list, "new ID will be ",id)
+
+	local tcbr = {}
+	-- makes a copy of the sigd list, for use in repair mechanisms where sigd may contain a tcbs field which we dont want
+	for _, sigd in ipairs(sigd_list) do
+		table.insert(tcbr, {p=sigd.p, s=sigd.s})
+		local tcbs = sigd.tcbs or ildb.get_tcbs(sigd)
+		if tcbs.ts_id then
+			error("Trying to create TS with TCBS that is already assigned to other section")
 		end
-		
-		-- remove entry from the list
-		local idx = 1
-		while idx <= #ts.tc_breaks do
-			local cmp = ts.tc_breaks[idx]
-			if sigd_equal(sigd, cmp) then
-				table.remove(ts.tc_breaks, idx)
+		tcbs.ts_id = id
+	end
+	
+	local new_ts = {
+		tc_breaks = tcbr
+	}
+	track_sections[id] = new_ts
+	-- update the TCB markers
+	for _, sigd in ipairs(sigd_list) do
+		advtrains.interlocking.show_tcb_marker(sigd.p)
+	end
+	
+	
+	ildb.update_rs_cache(id)
+	return id, new_ts
+end
+
+-- RS CACHE --
+
+--[[
+node_from_to_list - cache of from-to connid mappings and their associated state.
+Acts like a cache, built on demand by ildb.get_possible_out_connids(nodename)
+node_name = {
+	from_connid = {
+		to_connid = state
+	}
+}
+]]
+local node_from_to_state_cache = {}
+
+function ildb.get_possible_out_connids(node_name, in_connid)
+	if not node_from_to_state_cache[node_name] then
+		node_from_to_state_cache[node_name] = {}
+	end
+	local nt = node_from_to_state_cache[node_name]
+	if not nt[in_connid] then
+		local ta = {}
+		--atdebug("Node From/To State Cache: Caching for ",node_name,"connid",in_connid)
+		local ndef = minetest.registered_nodes[node_name]
+		if ndef.advtrains.node_state_map then
+			for state, tnode in pairs(ndef.advtrains.node_state_map) do
+				local tndef = minetest.registered_nodes[tnode]
+				-- verify that the conns table is identical - this is purely to catch setup errors!
+				if not tndef.at_conns or not tndef.at_conn_map then
+					--atdebug("ndef:",ndef,", tndef:",tndef)
+					error("In AT setup for node "..tnode..": Node set as state "..state.." of "..node_name.." in state_map, but is missing at_conns/at_conn_map!")
+				end
+				if #ndef.at_conns ~= #tndef.at_conns then
+					--atdebug("ndef:",ndef,", tndef:",tndef)
+					error("In AT setup for node "..tnode..": Conns table does not match that of "..node_name.." (of which this is state "..state..")")
+				end
+				for connid=1,#ndef.at_conns do
+					if ndef.at_conns[connid].c ~= tndef.at_conns[connid].c then
+						--atdebug("ndef:",ndef,", tndef:",tndef)
+						error("In AT setup for node "..tnode..": Conns table does not match that of "..node_name.." (of which this is state "..state..")")
+					end
+				end
+				-- do the actual caching by looking at the conn_map
+				local target_connid = tndef.at_conn_map[in_connid]
+				if ta[target_connid] then
+					-- Select the variant for which the other way would back-connect. This way, turnouts will switch to the appropriate branch if the train joins
+					local have_back_conn = (tndef.at_conn_map[target_connid])==in_connid
+					--atdebug("Found second state mapping",in_connid,"-",target_connid,"have_back_conn=",have_back_conn)
+					if have_back_conn then
+						--atdebug("Overwriting",in_connid,"-",target_connid,"=",state)
+						ta[target_connid] = state
+					end
+				else
+					--atdebug("Setting",in_connid,"-",target_connid,"=",state)
+					ta[target_connid] = state
+				end
+			end
+		else
+			error("Node From/To State Cache: "..node_name.." doesn't have a state map, is not a switchable track! Panic!")
+		end
+		nt[in_connid] = ta
+	end
+	return nt[in_connid]
+end
+
+local function recursively_find_routes(s_pos, s_connid, locks_found, result_table, scan_limit)
+	--atdebug("Recursively restarting at ",s_pos, s_connid, "limit left", scan_limit)
+	local ti = advtrains.get_track_iterator(s_pos, s_connid, scan_limit, false)
+	local pos, connid, bconnid = ti:next_branch()
+	pos, connid, bconnid = ti:next_track()-- step once to get ahead of previous turnout
+	local last_pos
+	while pos do -- this stops the loop when either the track end is reached or the limit is hit
+		local node = advtrains.ndb.get_node_or_nil(pos)
+		--atdebug("Walk ",pos, "nodename", node.name, "entering at conn",bconnid)
+		local ndef = minetest.registered_nodes[node.name]
+		if ndef.advtrains and ndef.advtrains.node_state_map then
+			-- Stop, this is a switchable node. Find out which conns we can go at
+			--atdebug("Found turnout ",pos, "nodename", node.name, "entering at conn",bconnid)
+			local pts = advtrains.encode_pos(pos)
+			if locks_found[pts] then
+				-- we've been here before. Stop
+				--atdebug("Was already seen! returning")
+				return
+			end
+			local out_conns = ildb.get_possible_out_connids(node.name, bconnid)
+			-- note 2025-01-06: get_possible_out_connids contains some logic so that the correct switch state is selected even if the turnout is entered from the branch side (see "have_back_conn")
+			for oconnid, state in pairs(out_conns) do
+				--atdebug("Going in direction",oconnid,"state",state)
+				locks_found[pts] = state
+				recursively_find_routes(pos, oconnid, locks_found, result_table, ti.limit)
+				locks_found[pts] = nil
+			end
+			return
+		end
+		--otherwise, this might be a tcb
+		local tcb = ildb.get_tcb(pos)
+		if tcb then
+			-- we found a tcb, store the current locks in the result_table
+			local end_pkey = advtrains.encode_pos(pos)
+			--atdebug("Found end TCB", pos, end_pkey,", returning")
+			if result_table[end_pkey] then
+				atwarn("While caching track section routing, found multiple route paths within same track section. Only first one found will be used")
 			else
-				idx = idx + 1
+				result_table[end_pkey] = table.copy(locks_found)
 			end
+			return
 		end
-		tcbs.ts_id = nil
-		
-		--ildb.sync_tcb_neighbors(sigd.p, sigd.s)
+		-- Go forward
+		last_pos = pos
+		pos, connid, bconnid = ti:next_track()
+	end 
+	--atdebug("recursively_find_routes: Reached track end or limit at", last_pos, ". This path is not saved, returning")
+end
+
+-- Updates the turnout cache of the given track section
+function ildb.update_rs_cache(ts_id)
+	local ts = ildb.get_ts(ts_id)
+	if not ts then
+		error("Update TS Cache called with nonexisting ts_id "..(ts_id or "nil"))
+	end
+	local rscache = {}
+	--atdebug("== Running update_rs_cache for ",ts_id) 
+	-- start on every of the TS's TCBs, walk the track forward and store locks along the way
+	for start_tcbi, start_tcbs in ipairs(ts.tc_breaks) do
+		start_pkey = advtrains.encode_pos(start_tcbs.p)
+		rscache[start_pkey] = {}
+		--atdebug("Starting for ",start_tcbi, start_tcbs)
+		local locks_found = {}
+		local result_table = {}
 		
-		if #ts.tc_breaks == 0 then
-			track_sections[tsid] = nil
+		recursively_find_routes(start_tcbs.p, start_tcbs.s, locks_found, result_table, TS_MAX_SCAN)
+		-- now result_table contains found route locks. Match them with the other TCBs we have in this section
+		for end_tcbi, end_tcbs in ipairs(ts.tc_breaks) do
+			if end_tcbi ~= start_tcbi then
+				end_pkey = advtrains.encode_pos(end_tcbs.p)
+				if result_table[end_pkey] then
+					--atdebug("Set RSCache entry",end_pkey.."-"..end_pkey,"=",result_table[end_pkey])
+					local lockstab = result_table[end_pkey]
+					if ts.fixed_locks then -- include the sections fixedlocks if present
+						for pts, st in pairs(ts.fixed_locks) do lockstab[pts] = st end
+					end
+					rscache[start_pkey][end_pkey] = lockstab
+					result_table[end_pkey] = nil
+				end
+			end
+		end
+		-- warn about superfluous entry
+		for sup_end_pkey, sup_entry in pairs(result_table) do
+			atwarn("In update_rs_cache for section",ts_id,"found superfluous endpoint",sup_end_pkey,"->",sup_entry)
 		end
 	end
-	advtrains.interlocking.show_tcb_marker(sigd.p)
-	if tcbs.signal then
-		return false
-	end
-	return true
+	ts.rs_cache = rscache
+	--atdebug("== Done update_rs_cache for ",ts_id, "result:",rscache) 
 end
 
-function ildb.remove_tcb(pos)
-	local pts = advtrains.roundfloorpts(pos)
-	if not track_circuit_breaks[pts] then
-		return true --FIX: not an error, because tcb is already removed
-	end
+
+--- DB API functions
+
+local lntrans = { "A", "B" }
+function ildb.sigd_to_string(sigd)
+	return minetest.pos_to_string(sigd.p).." / "..lntrans[sigd.s]
+end
+
+-- Create a new TCB at the position and update/repair the adjoining sections
+function ildb.create_tcb_at(pos)
+	--atdebug("create_tcb_at",pos)
+	local pts = advtrains.encode_pos(pos)
+	track_circuit_breaks[pts] = {[1] = {}, [2] = {}}
+	local all_tcbs_1 = ildb.get_all_tcbs_adjacent(pos, 1)
+	--atdebug("TCBs on A side",all_tcbs_1)
+	local all_tcbs_2 = ildb.get_all_tcbs_adjacent(pos, 2)
+	--atdebug("TCBs on B side",all_tcbs_2)
+	-- perform TS repair
+	ildb.repair_ts_merge_all(all_tcbs_1, false)
+	ildb.repair_ts_merge_all(all_tcbs_2, false)
+end
+
+-- Remove TCB at the position and update/repair the now joined section
+--   skip_tsrepair: should be set to true when the rail node at the TCB position is already gone.
+--                  Assumes the track sections are now separated and does not attempt the repair process.
+function ildb.remove_tcb_at(pos, pname, skip_tsrepair)
+	--atdebug("remove_tcb_at",pos)
+	local pts = advtrains.encode_pos(pos)
+	local old_tcb = track_circuit_breaks[pts]
+	-- unassign signals if defined
 	for connid=1,2 do
-		if not ildb.remove_from_interlocking({p=pos, s=connid}) then
-			return false
+		if old_tcb[connid].signal then
+			ildb.set_sigd_for_signal(old_tcb[connid].signal, nil)
 		end
 	end
 	track_circuit_breaks[pts] = nil
+	-- purge the track sections adjacent
+	if old_tcb[1].ts_id then
+		ildb.purge_ts_tcb_refs(old_tcb[1].ts_id)
+	end
+	if old_tcb[2].ts_id then
+		ildb.purge_ts_tcb_refs(old_tcb[2].ts_id)
+	end
+	-- update xlink partners
+	if old_tcb[1].xlink then
+		ildb.validate_tcb_xlink(old_tcb[1].xlink)
+	end
+	if old_tcb[2].xlink then
+		ildb.validate_tcb_xlink(old_tcb[2].xlink)
+	end
+	advtrains.interlocking.remove_tcb_marker(pos)
+	-- If needed, merge the track sections here
+	if not skip_tsrepair then
+		ildb.check_and_repair_ts_at_pos(pos, nil, pname)
+	end
 	return true
 end
 
-function ildb.dissolve_ts(ts_id)
-	local ts = ildb.get_ts(ts_id)
-	if not ildb.may_modify_ts(ts) then return false end
-	local tcbr = advtrains.merge_tables(ts.tc_breaks)
-	for _,sigd in ipairs(tcbr) do
-		ildb.remove_from_interlocking(sigd)
+-- Xlink: Connecting not-physically-connected sections handling
+
+-- Ensures that the xlink of this tcbs is bidirectional
+function ildb.validate_tcb_xlink(sigd, suppress_repairs)
+	local tcbs = sigd.tcbs or ildb.get_tcbs(sigd)
+	local osigd = tcbs.xlink
+	if not osigd then return end
+	local otcbs = ildb.get_tcbs(tcbs.xlink)
+	if not otcbs then
+		--atdebug("validate_tcb_xlink",sigd,": Link partner ",osigd,"orphaned")
+		tcbs.xlink = nil
+		if not suppress_repairs then
+			ildb.check_and_repair_ts_at_pos(sigd.p, sigd.s)
+		end
+		return
 	end
-	-- Note: ts gets removed in the moment of the removal of the last TCB.
-	return true
+	if otcbs.xlink then
+		if not vector.equals(otcbs.xlink.p, sigd.p) or otcbs.xlink.s~=sigd.s then
+			--atdebug("validate_tcb_xlink",sigd,": Link partner ",osigd,"backreferencing to someone else (namely",otcbs.xlink,") clearing it")
+			tcbs.xlink = nil
+			if not suppress_repairs then
+				ildb.check_and_repair_ts_at_pos(sigd.p, sigd.s)
+				--atdebug("validate_tcb_xlink",sigd,": Link partner ",osigd," was backreferencing to someone else, now updating that")
+				ildb.validate_tcb_xlink(osigd)
+			end
+		end
+	else
+		--atdebug("validate_tcb_xlink",sigd,": Link partner ",osigd,"wasn't backreferencing, clearing it")
+		tcbs.xlink = nil
+		if not suppress_repairs then
+			ildb.check_and_repair_ts_at_pos(sigd.p, sigd.s)
+		end
+	end
+end
+
+function ildb.add_tcb_xlink(sigd1, sigd2)
+	--("add_tcb_xlink",sigd1, sigd2)
+	local tcbs1 = sigd1.tcbs or ildb.get_tcbs(sigd1)
+	local tcbs2 = sigd2.tcbs or ildb.get_tcbs(sigd2)
+	if vector.equals(sigd1.p, sigd2.p) then
+		--atdebug("add_tcb_xlink Cannot xlink with same TCB")
+		return
+	end
+	if not tcbs1 or not tcbs2 then
+		--atdebug("add_tcb_xlink TCBS doesnt exist")
+		return
+	end
+	if tcbs1.xlink or tcbs2.xlink then
+		--atdebug("add_tcb_xlink One already linked")
+		return
+	end
+	-- apply link
+	tcbs1.xlink = {p=sigd2.p, s=sigd2.s}
+	tcbs2.xlink = {p=sigd1.p, s=sigd1.s}
+	-- update section. It should be sufficient to call update only once because the TCBs are linked anyway now
+	ildb.check_and_repair_ts_at_pos(sigd1.p, sigd1.s)
+end
+
+function ildb.remove_tcb_xlink(sigd)
+	--atdebug("remove_tcb_xlink",sigd)
+	-- Validate first. If Xlink is gone already then, nothing to do
+	ildb.validate_tcb_xlink(sigd)
+	-- Checking all of these already done by validate
+	local tcbs = sigd.tcbs or ildb.get_tcbs(sigd)
+	local osigd = tcbs.xlink
+	if not osigd then
+		-- validate already cleared us
+		--atdebug("remove_tcb_xlink: Already gone by validate")
+		return
+	end
+	local otcbs = ildb.get_tcbs(tcbs.xlink)
+	-- clear it
+	otcbs.xlink = nil
+	tcbs.xlink = nil
+	-- Update section for ourself and the other one
+	ildb.check_and_repair_ts_at_pos(sigd.p, sigd.s)
+	ildb.check_and_repair_ts_at_pos(osigd.p, osigd.s)
+end
+
+function ildb.create_ts_from_tcbs(sigd)
+	--atdebug("create_ts_from_tcbs",sigd)
+	local all_tcbs = ildb.get_all_tcbs_adjacent(sigd.p, sigd.s)
+	ildb.repair_ts_merge_all(all_tcbs, true)
+end
+
+-- Remove the given track section, leaving its TCBs with no section assigned
+function ildb.remove_ts(ts_id)
+	--atdebug("remove_ts",ts_id)
+	local ts = track_sections[ts_id]
+	if not ts then
+		error("remove_ts: "..ts_id.." doesn't exist")
+	end
+	while ts.tc_breaks[i] do
+		-- get TCBS
+		local sigd = ts.tc_breaks[i]
+		local tcbs = ildb.get_tcbs(sigd)
+		if tcbs then
+			--atdebug("cleared TCB",sigd)
+			tcbs.ts_id = nil
+		else
+			--atdebug("orphan TCB",sigd)
+		end
+		i = i+1
+	end
+	track_sections[ts_id] = nil
 end
 
 -- Returns true if it is allowed to modify any property of a track section, such as
@@ -509,38 +978,8 @@ function ildb.may_modify_tcbs(tcbs)
 	return true
 end
 
--- Utilize the traverser to find the track section at the specified position
--- Returns:
--- ts_id, origin - the first found ts and the sigd of the found tcb
--- nil - there were no TCBs in TRAVERSER_MAX range of the position
--- false - the first found TCB stated End-Of-Interlocking, or track ends were reached
-function ildb.get_ts_at_pos(pos)
-	local node_ok, conns, rhe = advtrains.get_rail_info_at(pos, advtrains.all_tracktypes)
-	if not node_ok then
-		error("get_ts_at_pos but node is NOK: "..minetest.pos_to_string(pos))
-	end
-	local limit_hit = false
-	local found_tcbs = {}
-	for connid, conn in ipairs(conns) do -- Note: a breadth-first-search would be better for performance
-		limit_hit = limit_hit or traverser(found_tcbs, pos, conns, connid, 0, 1)
-		if #found_tcbs >= 1 then
-			local tcbs = ildb.get_tcbs(found_tcbs[1])
-			local ts
-			if tcbs.ts_id then
-				return tcbs.ts_id, found_tcbs[1]
-			else
-				return false
-			end
-		end
-	end
-	if limit_hit then
-		-- there was at least one limit hit
-		return nil
-	else
-		-- all traverser ends were track ends
-		return false
-	end
-end
+
+-- Signals/IP --
 
 
 -- returns the sigd the signal at pos belongs to, if this is known
@@ -556,11 +995,34 @@ function ildb.get_sigd_for_signal(pos)
 	end
 	return nil
 end
-function ildb.set_sigd_for_signal(pos, sigd)
+function ildb.set_sigd_for_signal(pos, sigd) -- do not use!
 	local pts = advtrains.roundfloorpts(pos)
 	signal_assignments[pts] = sigd
 end
 
+-- Assign the signal at pos to the given TCB side.
+function ildb.assign_signal_to_tcbs(pos, sigd)
+	local tcbs = ildb.get_tcbs(sigd)
+	assert(tcbs, "assign_signal_to_tcbs invalid sigd!")
+	tcbs.signal = pos
+	if not tcbs.routes then
+		tcbs.routes = {}
+	end
+	ildb.set_sigd_for_signal(pos, sigd)
+end
+
+-- unassign the signal from the given sigd (looks in tcbs.signal for the signalpos)
+function ildb.unassign_signal_for_tcbs(sigd)
+	local tcbs = advtrains.interlocking.db.get_tcbs(sigd)
+	if not tcbs then return end
+	local pos = tcbs.signal
+	if not pos then return end
+	ildb.set_sigd_for_signal(pos, nil)
+	tcbs.signal = nil
+	tcbs.route_aspect = nil
+	tcbs.route_remote = nil
+end
+
 -- checks if there's any influence point set to this position
 -- if purge is true, checks whether the associated signal still exists
 -- and deletes the ip if not.
@@ -570,7 +1032,7 @@ function ildb.is_ip_at(pos, purge)
 		if purge then
 			-- is there still a signal assigned to it?
 			for connid, sigpos in pairs(influence_points[pts]) do
-				local asp = advtrains.interlocking.signal_get_aspect(sigpos)
+				local asp = advtrains.interlocking.signal.get_aspect_info(sigpos)
 				if not asp then
 					atlog("Clearing orphaned signal influence point", pts, "/", connid)
 					ildb.clear_ip_signal(pts, connid)
@@ -597,7 +1059,7 @@ end
 function ildb.get_ip_signal_asp(pts, connid)
 	local p = ildb.get_ip_signal(pts, connid)
 	if p then
-		local asp = advtrains.interlocking.signal_get_aspect(p)
+		local asp = advtrains.interlocking.signal.get_aspect_info(p)
 		if not asp then
 			atlog("Clearing orphaned signal influence point", pts, "/", connid)
 			ildb.clear_ip_signal(pts, connid)
diff --git a/advtrains_interlocking/demosignals.lua b/advtrains_interlocking/demosignals.lua
deleted file mode 100644
index 98fa421..0000000
--- a/advtrains_interlocking/demosignals.lua
+++ /dev/null
@@ -1,104 +0,0 @@
--- Demonstration signals
--- Those can display the 3 main aspects of Ks signals
-
--- Note that the group value of advtrains_signal is 2, which means "step 2 of signal capabilities"
--- advtrains_signal=1 is meant for signals that do not implement set_aspect.
-
-
-local setaspect = function(pos, node, asp)
-	if asp.main == 0 then
-		advtrains.ndb.swap_node(pos, {name="advtrains_interlocking:ds_danger"})
-	else
-		if asp.dst ~= 0 and asp.main == -1 then
-			advtrains.ndb.swap_node(pos, {name="advtrains_interlocking:ds_free"})
-		else
-			advtrains.ndb.swap_node(pos, {name="advtrains_interlocking:ds_slow"})
-		end
-	end
-	local meta = minetest.get_meta(pos)
-	if meta then
-		meta:set_string("infotext", minetest.serialize(asp))
-	end
-end
-
-local suppasp = {
-		main = {0, 6, -1},
-		dst = {0, false},
-		shunt = false,
-		proceed_as_main = true,
-		info = {
-			call_on = false,
-			dead_end = false,
-			w_speed = nil,
-		}
-}
-
-minetest.register_node("advtrains_interlocking:ds_danger", {
-	description = attrans("Demo signal at Danger"),
-	tiles = {"at_il_signal_asp_danger.png"},
-	groups = {
-		cracky = 3,
-		advtrains_signal = 2,
-		save_in_at_nodedb = 1,
-	},
-	advtrains = {
-		set_aspect = setaspect,
-		supported_aspects = suppasp,
-		get_aspect = function(pos, node)
-			return advtrains.interlocking.DANGER
-		end,
-	},
-	on_rightclick = advtrains.interlocking.signal_rc_handler,
-	can_dig = advtrains.interlocking.signal_can_dig,
-	after_dig_node = advtrains.interlocking.signal_after_dig,
-})
-minetest.register_node("advtrains_interlocking:ds_free", {
-	description = attrans("Demo signal at Free"),
-	tiles = {"at_il_signal_asp_free.png"},
-	groups = {
-		cracky = 3,
-		advtrains_signal = 2,
-		save_in_at_nodedb = 1,
-	},
-	advtrains = {
-		set_aspect = setaspect,
-		supported_aspects = suppasp,
-		get_aspect = function(pos, node)
-			return {
-				main = -1,
-			}
-		end,
-	},
-	on_rightclick = advtrains.interlocking.signal_rc_handler,
-	can_dig = advtrains.interlocking.signal_can_dig,
-	after_dig_node = advtrains.interlocking.signal_after_dig,
-})
-minetest.register_node("advtrains_interlocking:ds_slow", {
-	description = attrans("Demo signal at Slow"),
-	tiles = {"at_il_signal_asp_slow.png"},
-	groups = {
-		cracky = 3,
-		advtrains_signal = 2,
-		save_in_at_nodedb = 1,
-	},
-	advtrains = {
-		set_aspect = setaspect,
-		supported_aspects = suppasp,
-		get_aspect = function(pos, node)
-			return {
-				main = 6,
-			}
-		end,
-	},
-	on_rightclick = advtrains.interlocking.signal_rc_handler,
-	can_dig = advtrains.interlocking.signal_can_dig,
-	after_dig_node = advtrains.interlocking.signal_after_dig,
-})
-
-minetest.register_craft({
-	output = "advtrains_interlocking:ds_danger",
-	recipe = {
-		{"bakedclay:black", "dye:red"},
-		{"default:glass", "default:glass"},
-	},
-})
diff --git a/advtrains_interlocking/init.lua b/advtrains_interlocking/init.lua
index ae73a37..596641e 100644
--- a/advtrains_interlocking/init.lua
+++ b/advtrains_interlocking/init.lua
@@ -2,7 +2,6 @@ ch_base.open_mod(minetest.get_current_modname())
 -- Advtrains interlocking system
 -- See database.lua for a detailed explanation
 
-
 advtrains.interlocking = {}
 
 advtrains.SHUNT_SPEED_MAX = 6
@@ -16,16 +15,19 @@ local modpath = minetest.get_modpath(minetest.get_current_modname()) .. DIR_DELI
 
 dofile(modpath.."database.lua")
 dofile(modpath.."signal_api.lua")
-dofile(modpath.."demosignals.lua")
+dofile(modpath.."signal_aspect_ui.lua")
 dofile(modpath.."train_sections.lua")
 dofile(modpath.."route_prog.lua")
 dofile(modpath.."routesetting.lua")
 dofile(modpath.."tcb_ts_ui.lua")
 dofile(modpath.."route_ui.lua")
+dofile(modpath.."smartroute.lua")
+dofile(modpath.."autonaming.lua")
 dofile(modpath.."tool.lua")
 
 dofile(modpath.."approach.lua")
 dofile(modpath.."ars.lua")
+
 dofile(modpath.."tsr_rail.lua")
 
 
diff --git a/advtrains_interlocking/mod.conf b/advtrains_interlocking/mod.conf
index 3b2d029..9191dd9 100644
--- a/advtrains_interlocking/mod.conf
+++ b/advtrains_interlocking/mod.conf
@@ -4,4 +4,4 @@ description=Interlocking system for Advanced Trains
 author=orwell96
 
 depends=advtrains
-optional_depends=advtrains_train_track
+#optional_depends=advtrains_train_track
diff --git a/advtrains_interlocking/route_prog.lua b/advtrains_interlocking/route_prog.lua
index cdc98c0..e0634d4 100644
--- a/advtrains_interlocking/route_prog.lua
+++ b/advtrains_interlocking/route_prog.lua
@@ -19,6 +19,11 @@ C. punch a turnout (or some other passive component) to fix its state (toggle)
 The route visualization will also be used to visualize routes after they have been programmed.
 ]]--
 
+-- TODO duplicate
+local lntrans = { "A", "B" }
+local function sigd_to_string(sigd)
+	return minetest.pos_to_string(sigd.p).." / "..lntrans[sigd.s]
+end
 
 -- table with objectRefs
 local markerent = {}
@@ -108,15 +113,7 @@ end
 
 --[[
 Route definition:
-route = {
-	name = <string>
-	[n] = {
-		next = <sigd>, -- of the next (note: next) TCB on the route
-		locks = {<pts> = "state"} -- route locks of this route segment
-	}
-	terminal = <sigd>,
-	aspect = <signal aspect>,--note, might change in future
-}
+=== See database.lua L238
 The first item in the TCB path (namely i=0) is always the start signal of this route,
 so this is left out.
 All subsequent entries, starting from 1, contain:
@@ -206,7 +203,7 @@ function advtrains.interlocking.visualize_route(origin, route, context, tmp_lcks
 		end
 	-- display locks set by player		
 		for pts, state in pairs(tmp_lcks) do
-			local pos = minetest.string_to_pos(pts)
+			local pos = advtrains.decode_pos(pts)
 			routesprite(context, pos, "fixp"..pts, "at_il_route_lock_edit.png", "Zajištěna ve stavu '"..state.."' cestou "..route.name.." (levý klik pro uvolnění)",
 				function() clear_lock(tmp_lcks, pname, pts) end)
 		end
@@ -216,20 +213,33 @@ end
 
 local player_rte_prog = {}
 
-function advtrains.interlocking.init_route_prog(pname, sigd)
+function advtrains.interlocking.init_route_prog(pname, sigd, default_route)
 	if not minetest.check_player_privs(pname, "interlocking") then
-		minetest.chat_send_player(pname, attrans("Insufficient privileges to use this!"))
+		minetest.chat_send_player(pname, "Insufficient privileges to use this!")
 		return
 	end
-	player_rte_prog[pname] = {
+	local rp = {
 		origin = sigd,
-		route = {
-			name = "PROG["..pname.."]",
-		},
-		tmp_lcks = {},
 	}
-	advtrains.interlocking.visualize_route(sigd, player_rte_prog[pname].route, "prog_"..pname, player_rte_prog[pname].tmp_lcks, pname)
-	minetest.chat_send_player(pname, "Režim programování cesty je aktivní. Klikejte levým tlačítkem na TCB pro přidání úseků a na výhybky pro jejich uzamčení.")
+	if default_route then
+		rp.route = table.copy(default_route)
+
+		-- "Step back one section", but keeping turnouts
+		local last_route = rp.route[#rp.route]
+		if last_route then
+			rp.tmp_lcks = last_route.locks
+			rp.route[#rp.route] = nil
+		end
+		rp.route.name = "PROG["..pname.."]"
+	else
+		rp.route = {
+			name = "PROG["..pname.."]"
+		}
+		rp.tmp_lcks = {}
+	end
+	player_rte_prog[pname] = rp
+	advtrains.interlocking.visualize_route(sigd, rp.route, "prog_"..pname, rp.tmp_lcks, pname)
+	minetest.chat_send_player(pname, "Route programming mode active. Punch TCBs to add route segments, punch turnouts to lock them.")
 end
 
 local function get_last_route_item(origin, route)
@@ -239,10 +249,10 @@ local function get_last_route_item(origin, route)
 	return route[#route].next
 end
 
-local function do_advance_route(pname, rp, sigd, tsname)
+local function do_advance_route(pname, rp, sigd, tsref)
 	table.insert(rp.route, {next = sigd, locks = rp.tmp_lcks})
 	rp.tmp_lcks = {}
-	chat(pname, "Úsek '"..tsname.."' přidán na cestu.")
+	chat(pname, "Úsek '"..(tsref and (tsref.name or "") or "--EOI--").."' přidán na cestu.")
 end
 
 local function finishrpform(pname)
@@ -425,20 +435,20 @@ minetest.register_on_player_receive_fields(function(player, formname, fields)
 			if fields.advance then
 				-- advance route
 				if not is_endpoint then
-					do_advance_route(pname, rp, this_sigd, this_ts.name)
+					do_advance_route(pname, rp, this_sigd, this_ts)
 				end
 			end
 			if fields.endhere then
 				if not is_endpoint then
-					do_advance_route(pname, rp, this_sigd, this_ts.name)
+					do_advance_route(pname, rp, this_sigd, this_ts)
 				end
 				finishrpform(pname)
 			end
 			if can_over and fields.endover then
 				if not is_endpoint then
-					do_advance_route(pname, rp, this_sigd, this_ts.name)
+					do_advance_route(pname, rp, this_sigd, this_ts)
 				end
-				do_advance_route(pname, rp, over_sigd, over_ts and over_ts.name or "--EOI--")
+				do_advance_route(pname, rp, over_sigd, over_ts)
 				finishrpform(pname)
 			end
 		end
@@ -488,6 +498,8 @@ minetest.register_on_player_receive_fields(function(player, formname, fields)
 			local terminal = get_last_route_item(rp.origin, rp.route)
 			rp.route.terminal = terminal
 			rp.route.name = fields.name
+			-- new routes now always use the rscache
+			rp.route.use_rscache = true
 			
 			table.insert(tcbs.routes, rp.route)
 			
@@ -524,13 +536,16 @@ minetest.register_on_punchnode(function(pos, node, player, pointed_thing)
 			-- show formspec
 			
 			show_routing_form(pname, tcbpos)
-			
 			advtrains.interlocking.visualize_route(rp.origin, rp.route, "prog_"..pname, rp.tmp_lcks, pname)
-			
+			return
+		elseif advtrains.interlocking.db.get_tcb(pos) then
+			-- the punched node itself is a TCB
+			show_routing_form(pname, pos)
+			advtrains.interlocking.visualize_route(rp.origin, rp.route, "prog_"..pname, rp.tmp_lcks, pname)
 			return
 		end
 		if advtrains.is_passive(pos) then
-			local pts = advtrains.roundfloorpts(pos)
+			local pts = advtrains.encode_pos(pos)
 			if rp.tmp_lcks[pts] then
 				clear_lock(rp.tmp_lcks, pname, pts)
 			else
diff --git a/advtrains_interlocking/route_ui.lua b/advtrains_interlocking/route_ui.lua
index 0903b27..3fb5bc6 100644
--- a/advtrains_interlocking/route_ui.lua
+++ b/advtrains_interlocking/route_ui.lua
@@ -3,6 +3,7 @@
 
 local atil = advtrains.interlocking
 local ildb = atil.db
+local F = advtrains.formspec
 
 -- TODO duplicate
 local lntrans = { "A", "B" }
@@ -10,9 +11,10 @@ local function sigd_to_string(sigd)
 	return minetest.pos_to_string(sigd.p).." / "..lntrans[sigd.s]
 end
 
+-- indexed by pname
+local sel_rpartcache = {}
 
-
-function atil.show_route_edit_form(pname, sigd, routeid)
+function atil.show_route_edit_form(pname, sigd, routeid, sel_rpartidx)
 
 	if not minetest.check_player_privs(pname, {train_operator=true, interlocking=true}) then
 		minetest.chat_send_player(pname, attrans("Insufficient privileges to use this!"))
@@ -30,16 +32,18 @@ function atil.show_route_edit_form(pname, sigd, routeid)
 	
 	-- construct textlist for route information
 	local tab = {}
-	local function itab(t)
+	local tabref = {}
+	local function itab(rseg, t, rty, rpara)
 		tab[#tab+1] = minetest.formspec_escape(string.gsub(t, ",", " "))
+		tabref[#tab] = { [rty] = true, param = rpara, seg = rseg, idx = #tab }
 	end
-	itab("TCB "..sigd_to_string(sigd).." ("..tcbs.signal_name..") Route #"..routeid)
+	itab(1, "("..(tcbs.signal_name or "+")..") Route #"..routeid, "signal", sigd)
 	
 	-- this code is partially copy-pasted from routesetting.lua
 	-- we start at the tc designated by signal
 	local c_sigd = sigd
 	local i = 1
-	local c_tcbs, c_ts_id, c_ts, c_rseg, c_lckp
+	local c_tcbs, c_ts_id, c_ts, c_rseg
 	while c_sigd and i<=#route do
 		c_tcbs = ildb.get_tcbs(c_sigd)
 		if not c_tcbs then
@@ -54,50 +58,127 @@ function atil.show_route_edit_form(pname, sigd, routeid)
 		c_ts = ildb.get_ts(c_ts_id)
 		
 		c_rseg = route[i]
-		c_lckp = {}
 		
-		itab(""..i.." Vjezd "..sigd_to_string(c_sigd).." -> Ús. "..(c_ts and c_ts.name or "-").." -> Výjezd "..(c_rseg.next and sigd_to_string(c_rseg.next) or "KONEC"))
+		local signame = "-"
+		if c_tcbs and c_tcbs.signal then signame = c_tcbs.signal_name or "o" end
+		itab(i, ""..i.." "..sigd_to_string(c_sigd).." ("..signame..")", "signal", c_sigd)
+		itab(i, "= "..(c_ts and c_ts.name or c_ts_id).." ="..(c_rseg.call_on and " [CO]" or ""), "section", c_ts_id)
 		
 		if c_rseg.locks then
 			for pts, state in pairs(c_rseg.locks) do
 				
-				local pos = minetest.string_to_pos(pts)
-				itab("  Zámek: "..pts.." -> "..state)
+				local pos = advtrains.decode_pos(pts)
+				itab(i, "Zámek "..pts.." -> "..state, "lock", pos)
 				if not advtrains.is_passive(pos) then
 					itab("-!- Na "..pts.." není žádná pasivní komponenta. Prosím, přenastavte cestu!")
 					break
 				end
 			end
 		end
+		-- sanity check, is section at next the same as the current?
+		local nvar = c_rseg.next
+		if nvar then
+			local re_tcbs = ildb.get_tcbs({p = nvar.p, s = (nvar.s==1) and 2 or 1})
+			if not re_tcbs or not re_tcbs.ts_id or re_tcbs.ts_id~=c_ts_id then
+				itab(i, "-!- At "..sigd_to_string(c_sigd)..".Section Start and End do not match!", "err", nil)
+				break
+			end
+		end
 		-- advance
-		c_sigd = c_rseg.next
+		c_sigd = nvar
 		i = i + 1
 	end
 	if c_sigd then
 		local e_tcbs = ildb.get_tcbs(c_sigd)
-		itab("Konec cesty: "..sigd_to_string(c_sigd).." ("..(e_tcbs and e_tcbs.signal_name or "-")..")")
+		local signame = "-"
+		if e_tcbs and e_tcbs.signal then signame = e_tcbs.signal_name or "o" end
+		itab(i, "E "..sigd_to_string(c_sigd).." ("..signame..")", "end", c_sigd)
 	else
-		itab("Cesta je slepá")
+		itab(i, "E (none)", "end", nil)
 	end
 	
-	form = form.."textlist[0.5,2;7.75,3.9;rtelog;"..table.concat(tab, ",").."]"
+	if not sel_rpartidx then sel_rpartidx = 1 end
+	form = form.."textlist[0.5,2;3.5,3.9;routelog;"..table.concat(tab, ",")..";"..(sel_rpartidx or 1)..";false]"
 	
-	form = form.."button[0.5,6;3,1;back;<<< Zpět na signalizaci]"
-	form = form.."button[4.5,6;2,1;aspect;Signál...]"
-	form = form.."button[6.5,6;2,1;delete;Smazat cestu]"
+	-- to the right of rtelog, controls are displayed for the thing in focus
+	-- What is in focus is determined by the parameter sel_rpartidx
+	
+	local sel_rpart = tabref[sel_rpartidx]
+	--atdebug("sel rpart",sel_rpart)
+	
+	if sel_rpart and sel_rpart.signal then
+		-- get TCBS here and rseg selected
+		local s_tcbs = ildb.get_tcbs(sel_rpart.param)
+		local rseg = route[sel_rpart.seg]
+		-- main aspect list
+		local signalpos = s_tcbs and s_tcbs.signal
+		if signalpos and rseg then
+			form = form..F.label(4.5, 2, "Signal Aspect:")
+			local ndef = signalpos and advtrains.ndb.get_ndef(signalpos)
+			if ndef and ndef.advtrains and ndef.advtrains.main_aspects then
+				local entries = { "<Default Aspect>" }
+				local sel = 1
+				for i, mae in ipairs(ndef.advtrains.main_aspects) do
+					entries[i+1] = mae.description
+					if mae.name == rseg.main_aspect then
+						sel = i+1
+					end
+				end
+				form = form..F.dropdown(4.5, 3.0, 4, "sa_main_aspect", entries, sel, true)
+			end
+			-- checkbox for assign distant signal
+			local assign_dst = rseg.assign_dst
+			if assign_dst == nil then
+				assign_dst = (sel_rpart.seg~=1) -- special behavior when assign_dst is nil (and not false):
+				-- defaults to false for the very first signal and true for all others (= minimal user configuration overhead)
+				-- Note: on save, the value will be fixed at either false or true
+			end
+			form = form..string.format("checkbox[4.5,4.0;sa_distant;Announce distant signal;%s]", assign_dst)
+		else
+			form = form..F.label(4.5, 2, "No Signal at this TCB")
+		end
+	elseif sel_rpart and sel_rpart.section then
+		local rseg = route[sel_rpart.seg]
+		if rseg then
+			form = form..F.label(4.5, 2, "Section Options:")
+			-- checkbox for call-on
+			form = form..string.format("checkbox[4.5,4.0;se_callon;Call-on (section may be occupied);%s]", rseg.call_on)
+		end
+	elseif sel_rpart and sel_rpart.err then
+		form = form.."textarea[4.5,2.5;4,4;errorta;Error:;"..tab[sel_rpartidx].."]"
+	else
+		form = form..F.label(4.5, 2, "<< Select a route part to edit options")
+	end
+	
+	form = form.."button[0.5,6;1,1;prev;<<<]"
+	form = form.."button[1.5,6;1,1;back;"..routeid.."/"..#tcbs.routes.."]"
+	form = form.."button[2.5,6;1,1;next;>>>]"
+	
+	
+	--if route.smartroute_generated or route.default_autoworking then
+	--	form = form.."button[3.5,6;2,1;noautogen;Clr Autogen]"
+	--end
+	form = form.."button[5.5,6;3,1;delete;Delete Route]"
+	form = form.."button[0.5,7;3,1;back;Back to signal]"
+	form = form.."button[3.5,7;2,1;clone;Clone Route]"
+	form = form.."button[5.5,7;3,1;newfrom;New From Route]"
 	
 	--atdebug(route.ars)
 	form = form.."style[ars;font=mono]"
-	form = form.."textarea[0.8,7.3;5,3;ars;Pravidla ARS;"..atil.ars_to_text(route.ars).."]"
-	form = form.."button[5.5,7.23;3,1;savears;Uložit pravidla ARS]"
+	form = form.."textarea[0.8,8.3;5,3;ars;ARS Rule List;"..atil.ars_to_text(route.ars).."]"
+	form = form.."button[5.5,8.23;3,1;savears;Save ARS List]"
 	
-	minetest.show_formspec(pname, "at_il_routeedit_"..minetest.pos_to_string(sigd.p).."_"..sigd.s.."_"..routeid, form)
-
+	local formname = "at_il_routeedit_"..minetest.pos_to_string(sigd.p).."_"..sigd.s.."_"..routeid
+	minetest.show_formspec(pname, formname, form)
+	-- record selected entry from routelog for receive fields callback
+	sel_rpartcache[pname] = sel_rpart
 end
 
 
 minetest.register_on_player_receive_fields(function(player, formname, fields)
 	local pname = player:get_player_name()
+	-- retreive sel_rpart from the cache in any case and clear it out
+	local sel_rpart = sel_rpartcache[pname]
 	if not minetest.check_player_privs(pname, {train_operator=true, interlocking=true}) then
 		return
 	end
@@ -118,26 +199,90 @@ minetest.register_on_player_receive_fields(function(player, formname, fields)
 		local route = tcbs.routes[routeid]
 		if not route then return end
 		
+		if fields.prev then
+			atil.show_route_edit_form(pname, sigd, routeid - 1)
+			return
+		end
+		if fields.next then
+			atil.show_route_edit_form(pname, sigd, routeid + 1)
+			return
+		end
+		
 		if fields.setname and fields.name then
 			route.name = fields.name
 		end
 		
-		if fields.aspect then
-			local suppasp = advtrains.interlocking.signal_get_supported_aspects(tcbs.signal)
-			
-			local callback = function(pname, asp)
-				route.aspect = asp
-				advtrains.interlocking.show_route_edit_form(pname, sigd, routeid)
+		if fields.sa_main_aspect and sel_rpart and sel_rpart.signal then
+			local idx = tonumber(fields.sa_main_aspect)
+			-- get TCBS here and rseg selected
+			local s_tcbs = ildb.get_tcbs(sel_rpart.param)
+			local rseg = route[sel_rpart.seg]
+			-- main aspect list
+			local signalpos = s_tcbs and s_tcbs.signal
+			if rseg then
+				rseg.main_aspect = nil
+				if idx > 1 then
+					local ndef = signalpos and advtrains.ndb.get_ndef(signalpos)
+					if ndef and ndef.advtrains and ndef.advtrains.main_aspects then
+						rseg.main_aspect = ndef.advtrains.main_aspects[idx - 1].name
+					end
+				end
 			end
-			
-			advtrains.interlocking.show_signal_aspect_selector(pname, suppasp, route.name, callback, route.aspect or advtrains.interlocking.GENERIC_FREE)
-			return
 		end
+		if fields.sa_distant and sel_rpart and sel_rpart.signal then
+			local rseg = route[sel_rpart.seg]
+			if rseg then
+				rseg.assign_dst = minetest.is_yes(fields.sa_distant)
+			end
+		end
+		if fields.se_callon and sel_rpart and sel_rpart.section then
+			local rseg = route[sel_rpart.seg]
+			if rseg then
+				rseg.call_on = minetest.is_yes(fields.se_callon)
+				-- reshow form to update CO marker
+				atil.show_route_edit_form(pname, sigd, routeid, sel_rpart.idx)
+				return
+			end
+		end
+		
+		--if fields.noautogen then
+		--	route.smartroute_generated = nil
+		--	route.default_autoworking = nil
+		--	-- reshow form for the button to disappear
+		--	atil.show_route_edit_form(pname, sigd, routeid, sel_rpart and sel_rpart.idx)
+		--	return
+		--end
+		
 		if fields.delete then
 			-- if something set the route in the meantime, make sure this doesn't break.
 			atil.route.update_route(sigd, tcbs, nil, true)
 			table.remove(tcbs.routes, routeid)
 			advtrains.interlocking.show_signalling_form(sigd, pname)
+			-- cleanup
+			sel_rpartcache[pname] = nil
+			return
+		end
+		
+		if fields.clone then
+			-- if something set the route in the meantime, make sure this doesn't break.
+			atil.route.update_route(sigd, tcbs, nil, true)
+			local rcopy = table.copy(route)
+			rcopy.name = route.name.."_copy"
+			rcopy.smartroute_generated = nil
+			table.insert(tcbs.routes, routeid+1, rcopy)
+			advtrains.interlocking.show_signalling_form(sigd, pname)
+			-- cleanup
+			sel_rpartcache[pname] = nil
+			return
+		end
+
+		if fields.newfrom then
+			advtrains.interlocking.init_route_prog(pname, sigd, route)
+			minetest.close_formspec(pname, formname)
+			tcbs.ars_ignore_next = nil
+			-- cleanup
+			sel_rpartcache[pname] = nil
+			return
 		end
 		
 		if fields.ars and fields.savears then
@@ -147,6 +292,25 @@ minetest.register_on_player_receive_fields(function(player, formname, fields)
 		
 		if fields.back then
 			advtrains.interlocking.show_signalling_form(sigd, pname)
+			-- cleanup
+			sel_rpartcache[pname] = nil
+			return
+		end
+		
+		-- if an entry was selected in the textlist (and its not the current one) update the form
+		if fields.routelog then
+			local prev_idx = sel_rpart and sel_rpart.idx or 1
+			local tev = minetest.explode_textlist_event(fields.routelog)
+			local new_idx = tev and tev.index
+			if new_idx and new_idx ~= prev_idx then
+				atil.show_route_edit_form(pname, sigd, routeid, new_idx)
+				return
+			end
+		end
+		
+		if fields.quit then
+			-- cleanup
+			sel_rpartcache[pname] = nil
 		end
 		
 	end
diff --git a/advtrains_interlocking/routesetting.lua b/advtrains_interlocking/routesetting.lua
index 67efaea..6544a92 100644
--- a/advtrains_interlocking/routesetting.lua
+++ b/advtrains_interlocking/routesetting.lua
@@ -43,13 +43,19 @@ function ilrs.set_route(signal, route, try)
 	local first = true
 	local i = 1
 	local rtename = route.name
-	local signalname = ildb.get_tcbs(signal).signal_name
+	local signalname = (ildb.get_tcbs(signal).signal_name or "") .. sigd_to_string(signal)
 	local c_tcbs, c_ts_id, c_ts, c_rseg, c_lckp
+	-- signals = { { pos = ., tcbs_ref = <tcbs>, role = "main_distant", main_aspect = nil, dst_type = "next_main" or "none" } 
+	local signals = {}
+	local nodst
 	while c_sigd and i<=#route do
 		c_tcbs = ildb.get_tcbs(c_sigd)
 		if not c_tcbs then
 			if not try then atwarn("Did not find TCBS",c_sigd,"while setting route",rtename,"of",signal) end
-			return false, "No TCB found at "..sigd_to_string(c_sigd)..". Please reconfigure route!"
+			return false, "No TCB found at "..sigd_to_string(c_sigd)..". Please update or reconfigure route!"
+		end
+		if i == 1 then
+			nodst = c_tcbs.nodst
 		end
 		c_ts_id = c_tcbs.ts_id
 		if not c_ts_id then
@@ -60,42 +66,79 @@ function ilrs.set_route(signal, route, try)
 		c_rseg = route[i]
 		c_lckp = {}
 		
-		if c_ts.route then
+		if not c_ts then
+			if not try then atwarn("Encountered ts missing during a real run of routesetting routine, at ts=",c_ts_id,"while setting route",rtename,"of",signal) end
+			return false, "Section '"..(c_ts_id).."' not found!", c_ts_id, nil
+		elseif c_ts.route then
 			if not try then atwarn("Encountered ts lock during a real run of routesetting routine, at ts=",c_ts_id,"while setting route",rtename,"of",signal) end
-			return false, "Section '"..c_ts.name.."' already has route set from "..sigd_to_string(c_ts.route.origin)..":\n"..c_ts.route.rsn, c_ts_id, nil
+			return false, "Section '"..(c_ts.name or c_ts_id).."' already has route set from "..sigd_to_string(c_ts.route.origin)..":\n"..c_ts.route.rsn, c_ts_id, nil
 		end
 		if c_ts.trains and #c_ts.trains>0 then
-			if not try then atwarn("Encountered ts occupied during a real run of routesetting routine, at ts=",c_ts_id,"while setting route",rtename,"of",signal) end
-			return false, "Section '"..c_ts.name.."' is occupied!", c_ts_id, nil
+			if c_rseg.call_on then
+				--atdebug("Routesetting: Call-on situation in", c_ts_id)
+			else
+				if not try then atwarn("Encountered ts occupied during a real run of routesetting routine, at ts=",c_ts_id,"while setting route",rtename,"of",signal) end
+				return false, "Section '"..(c_ts.name or c_ts_id).."' is occupied!", c_ts_id, nil
+			end
 		end
 		
-		for pts, state in pairs(c_rseg.locks) do
-			local confl = ilrs.has_route_lock(pts, state)
+		-- collect locks from rs cache and from route def
+		local c_locks = {}
+		if route.use_rscache and c_ts.rs_cache and c_rseg.next then
+			-- rscache needs to be enabled, present and next must be defined
+			start_pkey = advtrains.encode_pos(c_sigd.p)
+			end_pkey = advtrains.encode_pos(c_rseg.next.p)
+			if c_ts.rs_cache[start_pkey] and c_ts.rs_cache[start_pkey][end_pkey] then
+				for lp,lst in pairs(c_ts.rs_cache[start_pkey][end_pkey]) do
+					--atdebug("Add lock from RSCache:",lp,"->",lst)
+					c_locks[lp] = lst
+				end
+			elseif not try then
+				atwarn("While setting route",rtename,"of",signal,"segment "..i..",required path from",c_tcbs,"to",c_rseg.next,"was not found in the track section's RS cache. Please check!")
+			end
+		end
+		-- add all from locks, these override the rscache
+		for lpts,lst in pairs(c_rseg.locks) do
+			--atdebug("Add lock from Routedef:",lpts,"->",lst,"overrides",c_locks[lpts] or "none")
+			c_locks[lpts] = lst
+		end
+		
+		for lp, state in pairs(c_locks) do
+			local confl = ilrs.has_route_lock(lp, state)
 			
-			local pos = minetest.string_to_pos(pts)
+			local pos = advtrains.decode_pos(lp)
 			if advtrains.is_passive(pos) then
 				local cstate = advtrains.getstate(pos)
 				if cstate ~= state then
-					local confl = ilrs.has_route_lock(pts)
+					local confl = ilrs.has_route_lock(lp)
 					if confl then
-						if not try then atwarn("Encountered route lock while a real run of routesetting routine, at position",pts,"while setting route",rtename,"of",signal) end
-						return false, "Lock conflict at "..pts..", Held locked by:\n"..confl, nil, pts
+						if not try then atwarn("Encountered route lock while a real run of routesetting routine, at position",pos,"while setting route",rtename,"of",signal) end
+						return false, "Lock conflict at "..minetest.pos_to_string(pos)..", Held locked by:\n"..confl, nil, lp
 					elseif not try then
 						advtrains.setstate(pos, state)
 					end
 				end
 				if not try then
-					ilrs.add_route_lock(pts, c_ts_id, "Route '"..rtename.."' from signal '"..signalname.."'", signal)
-					c_lckp[#c_lckp+1] = pts
+					ilrs.add_route_lock(lp, c_ts_id, "Route '"..rtename.."' from signal '"..signalname.."'", signal)
+					c_lckp[#c_lckp+1] = lp
 				end
 			else
 				if not try then atwarn("Encountered route lock misconfiguration (no passive component) while a real run of routesetting routine, at position",pts,"while setting route",rtename,"of",signal) end
-				return false, "No passive component at "..pts..". Please reconfigure route!"
+				return false, "No passive component at "..minetest.pos_to_string(pos)..". Please update track section or reconfigure route!"
+			end
+		end
+		-- sanity check, is section at next the same as the current?
+		local nvar = c_rseg.next
+		if nvar then
+			local re_tcbs = ildb.get_tcbs({p = nvar.p, s = (nvar.s==1) and 2 or 1})
+			if (not re_tcbs or not re_tcbs.ts_id or re_tcbs.ts_id~=c_ts_id)
+					and route[i+1] then --FIX 2025-01-08: in old worlds the final TCB may be wrong (it didn't matter back then), don't error out here (route still shown invalid in UI)
+				if not try then atwarn("Encountered inconsistent ts (front~=back) while a real run of routesetting routine, at position",pts,"while setting route",rtename,"of",signal) end
+				return false, "TCB at "..minetest.pos_to_string(nvar.p).." has different section than previous TCB. Please update track section or reconfigure route!"
 			end
 		end
 		-- reserve ts and write locks
 		if not try then
-			local nvar = c_rseg.next
 			if not route[i+1] then
 				-- We shouldn't use the "next" value of the final route segment, because this can lead to accidental route-cancelling of already set routes from another signal.
 				nvar = nil
@@ -112,9 +155,22 @@ function ilrs.set_route(signal, route, try)
 			}
 			if c_tcbs.signal then
 				c_tcbs.route_committed = true
-				c_tcbs.aspect = route.aspect or advtrains.interlocking.GENERIC_FREE
 				c_tcbs.route_origin = signal
-				advtrains.interlocking.update_signal_aspect(c_tcbs)
+				-- determine route role
+				local ndef = advtrains.ndb.get_ndef(c_tcbs.signal)
+				local assign_dst = c_rseg.assign_dst
+				if assign_dst == nil then
+					assign_dst = (i~=1) -- special behavior when assign_dst is nil (and not false):
+					-- defaults to false for the very first signal and true for all others (= minimal user configuration overhead)
+				end
+				local sig_table = {
+					pos = c_tcbs.signal,
+					tcbs_ref = c_tcbs,
+					role = ndef and ndef.advtrains and ndef.advtrains.route_role,
+					main_aspect = c_rseg.main_aspect,
+					assign_dst = assign_dst
+				}
+				signals[#signals+1] = sig_table
 			end
 		end
 		-- advance
@@ -122,10 +178,47 @@ function ilrs.set_route(signal, route, try)
 		c_sigd = c_rseg.next
 		i = i + 1
 	end
+
+	-- Get reference to signal at end of route
+	local last_mainsig = nil
+	if c_sigd then
+		local e_tcbs = ildb.get_tcbs(c_sigd)
+		local pos = e_tcbs and e_tcbs.signal
+		if pos then
+			last_mainsig = pos
+		end
+	end
+	for i = #signals, 1, -1 do
+		-- note the signals are iterated backwards. Switch depending on the role
+		local sig = signals[i]
+		-- apply mainaspect
+		sig.tcbs_ref.route_aspect = sig.main_aspect or "_default" -- or route.main_aspect : TODO this does not work if a distant signal is on the path! Implement per-sig aspects!
+		if sig.role == "distant" or sig.role == "distant_repeater" or sig.role == "main_distant" then
+			if last_mainsig then
+				-- assign the remote as the last mainsig if desired
+				if sig.assign_dst then
+					sig.tcbs_ref.route_remote = last_mainsig
+				end
+				-- if it wasn't a distant_repeater clear the mainsig
+				if sig.role ~= "distant_repeater" then
+					last_mainsig = false
+				end
+			end
+		end
+		if sig.role == "main" or sig.role == "main_distant" or sig.role == "end" then
+			-- record this as the new last mainsig
+			last_mainsig = sig.pos
+		end
+		-- for shunt signals nothing happens
+		-- update the signal aspect on map
+		advtrains.interlocking.signal.update_route_aspect(sig.tcbs_ref, i ~= 1)
+	end
 	
 	return true
 end
 
+-- Change 2024-01-27: pts is not an encoded pos, not a pos-to-string!
+
 -- Checks whether there is a route lock that prohibits setting the component
 -- to the wanted state. returns string with reasons on conflict
 function ilrs.has_route_lock(pts)
@@ -172,6 +265,11 @@ function ilrs.free_route_locks(ts, lcks, nocallbacks)
 end
 
 function ilrs.free_route_locks_indiv(pts, ts, nocallbacks)
+	-- legacy: if starts with bracket then pts is still in old pos_to_string format (may happen because ts.route_post is not migrated)
+	if string.match(pts, "^%(") then
+		atdebug("free_route_locks_indiv: converting position",pts)
+		pts = advtrains.encode_pos(minetest.string_to_pos(pts))
+	end
 	local e = ilrs.rte_locks[pts]
 	if not e then return nil
 	elseif #e==0 then
@@ -191,7 +289,7 @@ function ilrs.free_route_locks_indiv(pts, ts, nocallbacks)
 	-- TODO use luaautomation timers?
 	if not nocallbacks then
 		minetest.after(0, ilrs.update_waiting, "lck", pts)
-		minetest.after(0.5, advtrains.set_fallback_state, minetest.string_to_pos(pts))
+		minetest.after(0.5, advtrains.set_fallback_state, advtrains.decode_pos(pts))
 	end
 end
 -- frees all route locks, even manual ones set with the tool, at a specific position
@@ -224,12 +322,13 @@ function ilrs.cancel_route_from(sigd)
 		--atdebug("cancelling",c_ts.route.rsn)
 		-- clear signal aspect and routesetting state
 		c_tcbs.route_committed = nil
-		c_tcbs.aspect = nil
+		c_tcbs.route_aspect = nil
+		c_tcbs.route_remote = nil
 		c_tcbs.routeset = nil
 		c_tcbs.route_auto = nil
 		c_tcbs.route_origin = nil
 		
-		advtrains.interlocking.update_signal_aspect(c_tcbs)
+		advtrains.interlocking.signal.update_route_aspect(c_tcbs)
 		
 		c_ts_id = c_tcbs.ts_id
 		if not c_tcbs then
@@ -273,17 +372,19 @@ function ilrs.update_route(sigd, tcbs, newrte, cancel)
 		--atdebug("Signal not in control, held by",tcbs.signal_name)
 		return
 	end
+	-- clear route_rsn, it will be set again if needed
+	tcbs.route_rsn = nil
 	if (newrte and tcbs.routeset and tcbs.routeset ~= newrte) or cancel then
 		if tcbs.route_committed then
 			--atdebug("Cancelling:",tcbs.routeset)
 			advtrains.interlocking.route.cancel_route_from(sigd)
 		end
 		tcbs.route_committed = nil
-		tcbs.aspect = nil
+		tcbs.route_aspect = nil
+		tcbs.route_remote = nil
 		has_changed_aspect = true
 		tcbs.routeset = nil
 		tcbs.route_auto = nil
-		tcbs.route_rsn = nil
 	end
 	if newrte or tcbs.routeset then
 		if tcbs.route_committed then
@@ -291,7 +392,14 @@ function ilrs.update_route(sigd, tcbs, newrte, cancel)
 		end
 		if newrte then tcbs.routeset = newrte end
 		--atdebug("Setting:",tcbs.routeset)
-		local succ, rsn, cbts, cblk = ilrs.set_route(sigd, tcbs.routes[tcbs.routeset])
+		local succ, rsn, cbts, cblk
+		local route = tcbs.routes[tcbs.routeset]
+		if route then
+			succ, rsn, cbts, cblk = ilrs.set_route(sigd, route)
+		else
+			succ = false
+			rsn = attrans("Route state changed.")
+		end
 		if not succ then
 			tcbs.route_rsn = rsn
 			--atdebug("Routesetting failed:",rsn)
@@ -308,12 +416,17 @@ function ilrs.update_route(sigd, tcbs, newrte, cancel)
 			end
 		else
 			--atdebug("Committed Route:",tcbs.routeset)
-			has_changed_aspect = true
+			-- set_route now sets the signal aspects
+			--has_changed_aspect = true
+			-- route success. apply default_autoworking flag if requested
+			if route.default_autoworking then
+				tcbs.route_auto = true --FIX 2025-01-08: never set it to false if it was true!
+			end
 		end
 	end
 	if has_changed_aspect then
 		-- FIX: prevent an minetest.after() loop caused by update_signal_aspect dispatching path invalidation, which in turn calls ARS again
-		advtrains.interlocking.update_signal_aspect(tcbs)
+		advtrains.interlocking.signal.update_route_aspect(tcbs)
 	end
 	advtrains.interlocking.update_player_forms(sigd)
 end
diff --git a/advtrains_interlocking/signal_api.lua b/advtrains_interlocking/signal_api.lua
index 15f26ca..7d718a4 100644
--- a/advtrains_interlocking/signal_api.lua
+++ b/advtrains_interlocking/signal_api.lua
@@ -1,539 +1,479 @@
 -- Signal API implementation
 
+local F = advtrains.formspec
 
---[[
-Signal aspect table:
-Note: All speeds are measured in m/s, aka the number of + signs in the HUD.
-asp = {
-	main = <int speed>,
-		-- Main signal aspect, tells state and permitted speed of next section
-		-- 0 = section is blocked
-		-- >0 = section is free, speed limit is this value
-		-- -1 = section is free, maximum speed permitted
-		-- false/nil = Signal doesn't provide main signal information, retain current speed limit.
-	shunt = <boolean>,
-		-- Whether train may proceed as shunt move, on sight
-		-- main aspect takes precedence over this
-		-- When main==0, train switches to shunt move and is restricted to speed 6
-	proceed_as_main = <boolean>,
-		-- If an approaching train is a shunt move and 'shunt' is false,
-		-- the train may proceed as a train move under the "main" aspect
-		-- if the main aspect permits it (i.e. main!=0)
-		-- If this is not set, shunt moves are NOT allowed to switch to
-		-- a train move, and must stop even if "main" would permit passing.
-		-- This is intended to be used for "Halt for shunt moves" signs.
-	
-	dst = <int speed>,
-		-- Distant signal aspect, tells state and permitted speed of the section after next section
-		-- The character of these information is purely informational
-		-- At this time, this field is not actively used
-		-- 0 = section is blocked
-		-- >0 = section is free, speed limit is this value
-		-- -1 = section is free, maximum speed permitted
-		-- false/nil = Signal doesn't provide distant signal information.
-	
-	-- the character of call_on and dead_end is purely informative
-	call_on = <boolean>, -- Call-on route, expect train in track ahead (not implemented yet)
-	dead_end = <boolean>, -- Route ends on a dead end (e.g. bumper) (not implemented yet)
-
-	w_speed = <integer>,
-	-- "Warning speed restriction". Supposed for short-term speed
-	-- restrictions which always override any other restrictions
-	-- imposed by "speed" fields, until lifted by a value of -1
-	-- (Example: german Langsamfahrstellen-Signale)
-	}
-}
-
-== How signals actually work in here ==
-Each signal (in the advtrains universe) is some node that has at least the
-following things:
-- An "influence point" that is set somewhere on a rail
-- An aspect which trains that pass the "influence point" have to obey
+local signal = {}
 
-There can be static and dynamic signals. Static signals are, roughly
-spoken, signs, while dynamic signals are "real" signals which can display
-different things.
-
-The node definition of a signal node should contain those fields:
-groups = {
-  	advtrains_signal = 2,
-	save_in_at_nodedb = 1,
+signal.MASP_HALT = {
+	name = "_halt",
+	halt = true,
 }
-advtrains = {
-	set_aspect = function(pos, node, asp)
-		-- This function gets called whenever the signal should display
-		-- a new or changed signal aspect. It is not required that
-		-- the signal actually displays the exact same aspect, since
-		-- some signals can not do this by design. However, it must
-		-- display an aspect that is at least as restrictive as the passed
-		-- aspect as far as it is capable of doing so.
-		-- Examples:
-		-- - pure shunt signals can not display a "main" aspect
-		--   and have no effect on train moves, so they will only ever
-		--   honor the shunt.free field for their aspect.
-		-- - the german Hl system can only signal speeds of 40, 60
-		--   and 100 km/h, a speed of 80km/h should then be signalled
-		--   as 60 km/h instead.
-		-- In turn, it is not guaranteed that the aspect will fulfill the
-		-- criteria put down in supported_aspects.
-		-- If set_aspect is present, supported_aspects should also be declared.
-		
-		-- The aspect passed in here can always be queried using the
-		-- advtrains.interlocking.signal_get_supposed_aspect(pos) function.
-		-- It is always DANGER when the signal is not used as route signal.
-		
-		-- For static signals, this function should be completely omitted
-		-- If this function is omitted, it won't be possible to use
-		-- route setting on this signal.
-	end,
-	supported_aspects = {
-		-- A table which tells which different types of aspects this signal
-		--  is able to display. It is used to construct the "aspect editing"
-		--  formspec for route programming (and others) It should always be
-		--  present alongside with set_aspect. If this is not specified but
-		--  set_aspect is, the user will be allowed to select any aspect.
-		-- Any of the fields marked with <boolean/nil> support 3 types of values:
-				nil: if this signal can switch between free/blocked
-				false: always shows "blocked", unchangable
-				true: always shows "free", unchangable
-		-- Any of the "speed" fields should contain a list of possible values
-		--  to be set as restriction. If omitted, the value of the described
-		--  field is always assumed to be false (no information)
-		-- A speed of 0 means that the signal can show a "blocked" aspect
-		--  (which is probably the case for most signals)
-		-- If the signal can signal "no information" on one of the fields
-		--  (thus false is an acceptable value), include false in the list
-		-- If your signal can only display a single speed (may it be -1),
-		--  always enclose that single value into a list. (such as {-1})
-		main = {<speed1>, ..., <speedn>} or nil,
-		dst = {<speed1>, ..., <speedn>} or nil,
-		shunt = <boolean/nil>,
-		
-		call_on = <boolean/nil>,
-		dead_end = <boolean/nil>,
-		w_speed = {<speed1>, ..., <speedn>} or nil,
-		
-	},
-	Example for supported_aspects:
-	supported_aspects = {
-		main = {0, 6, -1}, -- can show either "Section blocked", "Proceed at speed 6" or "Proceed at maximum speed"
-		dst = {0, false}, -- can show only if next signal shows "blocked", no other information.
-		shunt = false, -- shunting by this signal is never allowed.
-		
-		call_on = false,
-		dead_end = false,
-		w_speed = nil,
-		-- none of the information can be shown by the signal
-		
-	},
-	
-	get_aspect = function(pos, node)
-		-- This function gets called by the train safety system. It
-		should return the aspect that this signal actually displays,
-		not preferably the input of set_aspect.
-		-- For regular, full-featured light signals, they will probably
-		honor all entries in the original aspect, however, e.g.
-		simple shunt signals always return main=false regardless of
-		the set_aspect input because they can not signal "Halt" to
-		train moves.
-		-- advtrains.interlocking.DANGER contains a default "all-danger" aspect.
-		-- If your signal does not cover certain sub-tables of the aspect,
-		the following reasonable defaults are automatically assumed:
-		main = false (unchanged)
-		dst = false (unchanged)
-		shunt = false (shunting not allowed)
-		info = {} (no further information)
-	end,
+
+signal.MASP_DEFAULT = {
+	name = "_default",
+	default = true,
 }
-on_rightclick = advtrains.interlocking.signal_rc_handler
-can_dig =  advtrains.interlocking.signal_can_dig
-after_dig_node = advtrains.interlocking.signal_after_dig
-
-(If you need to specify custom can_dig or after_dig_node callbacks,
-please call those functions anyway!)
-
-Important note: If your signal should support external ways to set its
-aspect (e.g. via mesecons), there are some things that need to be considered:
-- advtrains.interlocking.signal_get_supposed_aspect(pos) won't respect this
-- Whenever you change the signal aspect, and that aspect change
-did not happen through a call to
-advtrains.interlocking.signal_set_aspect(pos, asp), you are
-*required* to call this function:
-advtrains.interlocking.signal_on_aspect_changed(pos)
-in order to notify trains about the aspect change.
-This function will query get_aspect to retrieve the new aspect.
-
-]]--
-
-local DANGER = {
+
+signal.ASPI_HALT = {
 	main = 0,
-	dst = false,
 	shunt = false,
 }
-advtrains.interlocking.DANGER = DANGER
 
-advtrains.interlocking.GENERIC_FREE = {
+signal.ASPI_FREE = {
 	main = -1,
 	shunt = false,
-	dst = false,
+	proceed_as_main = true,
 }
 
-local function convert_aspect_if_necessary(asp)
-	if type(asp.main) == "table" then
-		local newasp = {} 
-		if asp.main.free then
-			newasp.main = asp.main.speed
-		else
-			newasp.main = 0
-		end
-		if asp.dst and asp.dst.free then
-			newasp.dst = asp.dst.speed
-		else
-			newasp.dst = 0
+--[[
+Implementation plan orwell 2024-01-28:
+Most parts of ywang's implementation are fine, especially I like the formspecs. But I would like to change a few aspects (no pun intended) of this.
+- Signal gets distant assigned via field in signal aspect table (instead of explicitly)
+- Signal speed/shunt are no longer free-text but rather they need to be predefined in the node definition
+To do this: Differentiation between:
+== Main Aspect ==
+This is what a signal is assigned by either the route system or the user.
+It is a string key which has an appropriate entry in the node definition (where it has a description assigned)
+The signal mod defines a function to set a signal to the most appropriate aspect. This function gets
+a) the main aspect table (straight from node def)
+b) the distant signal's aspect group name & aspect table
+
+== Aspect ==
+One concrete combination of lights/shapes that a signal signal shows. Handling these is at the discretion of
+the signal mod defining the signal, and they are typically combinations of main aspect and distant aspect
+Example:
+- A Ks signal has the main_aspect="proceed_12" set for a route
+- The signal at the end of the route shows main_aspect="proceed_8", advtrains also passes on that this means {main=8, shunt=false}
+- The ndef.afunction(pos, node, main_aspect, rem_aspect, rem_aspinfo) determines that the signal should now show
+		blinking green with main indicator 12 and dst indicator 8, and sets the nodes accordingly.
+		This function can now return the Aspect Info table, which will be cached by advtrains until the aspect changes again
+		and will be used when a train approaches the signal. If nil is returned, then the aspect will be queried next time
+		by calling ndef.advtrains.get_aspect_info(pos)
+
+Note that once apply_aspect returns, there is no need for advtrains anymore to query the aspect info.
+When the signal, for any reason, wants to change its aspect by itself *without* going through the signal API then
+it should update the aspect info cache by calling advtrains.interlocking.signal.update_aspect_info(pos)
+
+Apply_aspect may also receive the special main aspect { name = "_halt", halt = true }. It usually means that the signal is not assigned to anything particular,
+and it should cause the signal to show its most restrictive aspect. Typically it is a halt aspect, but e.g. for distant-only
+signals this would be "expect stop".
+
+A special case occurs for pure distant signals: Such signals must set apply_aspect, but must not set main_aspects. Behavior is as follows:
+- Signal is uninitialized, distant signal is not assigned to a main signal, or no route is set: main_aspect == { name = "_halt", halt = true } and rem_aspect == nil
+- A remote main signal is assigned (either by user or by route): main_aspect is always { name = "_default" } and rem_aspect / rem_aspinfo give the correct information
+
+Main aspect names starting with underscore (e.g. "_default") are reserved and must not be used!
+
+== Aspect Info ==
+The actual signal aspect in the already-known format. This is what the trains use to determine halt/proceed and speed.
+asp = {
+	main = 0 (halt) / -1 (max speed) / false (no info) / <number> (speed limit)
+	shunt = true (shunt free) / false (shunt not free)
+	proceed_as_main = true (shunt move can proceed and become train move when main!=0) / false (no)
+	dst = speed of the remote signal (like main, informative character, not actually used)
+}
+
+Node definition of signals:
+- The signal needs some logic to figure out, for each combination of its own aspect group and the distant signal's aspect, what aspect info it can/will show.
+ndef.advtrains = {
+	main_aspects = {
+		{ name = "proceed" description = "Proceed at full speed", <more data at discretion of signal>}
+		{ name = "reduced" description = "Proceed at reduced speed", <more data at discretion of signal>}
+	}
+		-- This list is mainly for the selection dialog. Order of entries determines list order in the dropdown.
+		-- Some fields have special meaning:
+		-- name: A unique key to identify the main aspect. Might be required by some code.
+		-- description: Text shown in UI dropdown
+		-- Node can set any other fields at its discretion. They are not touched.
+		-- Note: Pure distant signals should set one main aspect, and set the "pure_distant = true" field
+	apply_aspect = function(pos, node, main_aspect, rem_aspect, rem_aspinfo)
+		-- set the node to show the desired aspect
+		-- called by advtrains when this signal's aspect group or the remote signal's aspect changes
+		-- main_aspect is never nil, but can be the special aspect { name = "_halt", halt = true }
+		-- MAY return the aspect_info. If it returns nil then get_aspect_info will be queried at a later point.
+	get_aspect_info(pos, main_aspect)
+		-- Returns the aspect info table (main, shunt, dst etc.)
+	distant_support = true or false
+		-- If true, signal is considered in distant signalling. If false or nil, rem_aspect and rem_aspinfo are never set.
+	route_role = one of "main", "main_distant", "shunt", "distant", "distant_repeater", "end"
+		-- Determines how the signal behaves when routes are set. Only in effect when signal is assigned to a TCB.
+		-- main: The signal is a possible endpoint for a train move route. Distant signals before it refer to it.
+		-- shunt: The signal is a possible endpoint for a shunt move route. Ignored for distant signals.
+		-- distant, distant_repeater: The next signal with role="main" is set as the remote signal. main_aspects may be undefined, the main aspect passed to apply_aspect is a dummy one in this case.
+		-- distant: if more than one distant signal is before a main signal, only the last one is assigned (but any number of distant_repeater signals are allowed)
+		-- main_distant: Combination of main and distant - like "main", but additionally gets assigned to the next main like a "distant"
+		-- end: like main, but signifies that it marks an end of track and trains cannot continue further. (currently no practical implications above main)
+	pure_distant = true / false
+		-- If true, this signal is assumed to be a pure distant signal (its halt aspect is rather "expect halt" and it cannot show a true "stop here")
+		-- The following special behavior applies when this signal is assigned to a TCB: When a train passes the signal, the aspect is not reset to the
+		-- halt aspect and it continues to announce the remote signal's aspect (like in real life)
+		-- Typically such signals have one main aspect, their appearance depends almost exclusively on their remote signal and the halt aspect is the same as
+		-- the aspect shown when the main aspect is set but the remote signal is at halt.
+}
+
+== Nomenclature ==
+The distant/main relation is named as follows:
+     V    M
+=====>====>
+Main signal (main) always refers to the signal that is in focus right now (even if that is a distant-only signal)
+From the standpoint of M, V is the distant (dst) signal. M does not need to concern itself with V's aspect but needs to notify V when it changes
+From the standpoint of V, M is the remote (rem) signal. V needs to show an aspect that matches its remote signal M
+
+== Criteria for which signals are eligible for routes ==
+
+All signals must define:
+- get_aspect_info()
+
+Signals that can be assigned to a TCB must satisfy:
+- apply_aspect() defined
+
+Signals that are possible start and end points for a route must satisfy:
+- main_aspects defined (note, pure distant signals should therefore not define main_aspects)
+
+]]
+
+-- Database
+-- Signal Aspect store
+-- Stores for each signal the main aspect and other info, like the assigned remote signal
+-- [signal encodePos] = { main = <table or string>, [remote = encodedPos] }
+-- main is a string: "named aspect" is looked up in the main_aspects table of the ndef
+-- main is a table: this table directly is the main aspect (used for advanced signals with additional lights/indicators)
+signal.aspects = {}
+
+-- Distant signal notification. Records for each signal the distant signals that refer to it
+-- Note: this mapping is weak. Needs always backreference check.
+-- [signal encodePos] = { [distant signal encodePos] = true }
+signal.distant_refs = {}
+
+function signal.load(data)
+	signal.aspects = data.aspects or {}
+	-- rebuild distant_refs after load
+	signal.distant_refs = {}
+	for main, aspt in pairs(signal.aspects) do
+		if aspt.remote then
+			if not signal.distant_refs[aspt.remote] then
+				signal.distant_refs[aspt.remote] = {}
+			end
+			signal.distant_refs[aspt.remote][main] = true
 		end
-		newasp.proceed_as_main = asp.shunt.proceed_as_main
-		newasp.shunt = asp.shunt.free
-		-- Note: info table not transferred, it's not used right now
-		return newasp
 	end
-	return asp
 end
 
-function advtrains.interlocking.update_signal_aspect(tcbs)
-	if tcbs.signal then
-		local asp = tcbs.aspect or DANGER
-		advtrains.interlocking.signal_set_aspect(tcbs.signal, asp)
-	end
+function signal.save(data)
+	data.aspects = signal.aspects
 end
 
-function advtrains.interlocking.signal_can_dig(pos)
-	return not advtrains.interlocking.db.get_sigd_for_signal(pos)
-end
 
-function advtrains.interlocking.signal_after_dig(pos)
-	-- clear influence point
-	advtrains.interlocking.db.clear_ip_by_signalpos(pos)
+-- Set a signal's aspect.
+-- Signal aspects should only be set through this function. It takes care of:
+-- - Storing the main aspect and dst pos for this signal permanently (until next change)
+-- - Assigning the distant signal for this signal
+-- - Calling apply_aspect() in the signal's node definition to make the signal show the aspect
+-- - Calling apply_aspect() again whenever the remote signal changes its aspect
+-- - Notifying this signal's distant signals about changes to this signal (unless skip_dst_notify is specified)
+-- main_asp: either a string (==name in ndef.advtrains.main_aspects) or the main aspect table directly (for advanced signals)
+function signal.set_aspect(pos, main_asp, rem_pos, skip_dst_notify)
+	-- safeguard for the two integrated aspects (these two must be passed as string key)
+	if type(main_asp)=="table" and (main_asp.name=="_default" or main_asp.name=="_halt") then
+		error("MASP_HALT and MASP_DEFAULT must be passed via string keys _halt or _default, not as tables!")
+	end
+	local main_pts = advtrains.encode_pos(pos)
+	local old_tbl = signal.aspects[main_pts]
+	local old_remote = old_tbl and old_tbl.remote
+	local new_remote = rem_pos and advtrains.encode_pos(rem_pos)
+	
+	-- if remote has changed, unregister from old remote
+	if old_remote and old_remote~=new_remote and signal.distant_refs[old_remote] then
+		--atdebug("unregister old remote: ",old_remote,"from",main_pts)
+		signal.distant_refs[old_remote][main_pts] = nil
+	end
+		
+	signal.aspects[main_pts] = { main = main_asp, remote = new_remote }
+	-- apply aspect on main signal, this also checks new_remote
+	signal.reapply_aspect(main_pts)	
+	
+	-- notify my distants about this change (with limit 2)
+	if not skip_dst_notify then
+		signal.notify_distants_of(main_pts, 2)
+	end
 end
 
-function advtrains.interlocking.signal_set_aspect(pos, asp)
-	asp = convert_aspect_if_necessary(asp)
-	local node=advtrains.ndb.get_node(pos)
-	local ndef=minetest.registered_nodes[node.name]
-	if ndef and ndef.advtrains and ndef.advtrains.set_aspect then
-		ndef.advtrains.set_aspect(pos, node, asp)
-		advtrains.interlocking.signal_on_aspect_changed(pos)
+function signal.clear_aspect(pos, skip_dst_notify)
+	local main_pts = advtrains.encode_pos(pos)
+	local old_tbl = signal.aspects[main_pts]
+	local old_remote = old_tbl and old_tbl.remote
+	
+	-- unregister from old remote
+	if old_remote then
+		signal.distant_refs[old_remote][main_pts] = nil
+	end
+		
+	signal.aspects[main_pts] = nil
+	-- apply aspect on main signal, this also checks new_remote
+	signal.reapply_aspect(main_pts)	
+	
+	-- notify my distants about this change (with limit 2)
+	if not skip_dst_notify then
+		signal.notify_distants_of(main_pts, 2)
 	end
 end
 
--- should be called when aspect has changed on this signal.
-function advtrains.interlocking.signal_on_aspect_changed(pos)
-	local ipts, iconn = advtrains.interlocking.db.get_ip_by_signalpos(pos)
-	if not ipts then return end
-	local ipos = minetest.string_to_pos(ipts)
+-- Clear any info about aspects from this signal, without resetting/reapplying the aspect.
+-- Supposed to be used for legacy on-off signals when the on-off toggle is used
+function signal.unregister_aspect(pos)
+	local main_pts = advtrains.encode_pos(pos)
+	local old_tbl = signal.aspects[main_pts]
+	local old_remote = old_tbl and old_tbl.remote
 	
-	advtrains.invalidate_all_paths_ahead(ipos)
+	-- unregister from old remote
+	if old_remote then
+		signal.distant_refs[old_remote][main_pts] = nil
+	end
+		
+	signal.aspects[main_pts] = nil
 end
 
-function advtrains.interlocking.signal_rc_handler(pos, node, player, itemstack, pointed_thing)
-	local pname = player:get_player_name()
-	local control = player:get_player_control()
-	if control.aux1 then
-		advtrains.interlocking.show_ip_form(pos, pname)
+-- Notify distant signals of main_pts of a change in the aspect of this signal
+-- 
+function signal.notify_distants_of(main_pts, limit)
+	--atdebug("notify_distants_of",advtrains.decode_pos(main_pts),"limit",limit)
+	if limit <= 0 then
 		return
 	end
-	
-	local sigd = advtrains.interlocking.db.get_sigd_for_signal(pos)
-	if sigd then
-		advtrains.interlocking.show_signalling_form(sigd, pname)
-	else
-		local ndef = minetest.registered_nodes[node.name]
-		if ndef.advtrains and ndef.advtrains.set_aspect then
-			-- permit to set aspect manually
-			local function callback(pname, aspect)
-				advtrains.interlocking.signal_set_aspect(pos, aspect)
+	local dstrefs = signal.distant_refs[main_pts]
+	--atdebug("dstrefs",dstrefs,"")
+	if dstrefs then
+		for dst,_ in pairs(dstrefs) do
+			-- ensure that the backref is still valid
+			local dst_asp = signal.aspects[dst]
+			if dst_asp and dst_asp.remote == main_pts then
+				signal.reapply_aspect(dst)
+				signal.notify_distants_of(dst, limit - 1)
+			else
+				atwarn("Distant signal backref is not purged: main =",main_pts,", distant =",dst,", remote =",dst_asp.remote,"")
 			end
-			local isasp = ndef.advtrains.get_aspect(pos, node)
-			
-			advtrains.interlocking.show_signal_aspect_selector(
-				pname,
-				ndef.advtrains.supported_aspects,
-				attrans("Set aspect manually"), callback,
-				isasp)
-		else
-			--static signal - only IP
-			advtrains.interlocking.show_ip_form(pos, pname)
 		end
 	end
 end
 
--- Returns the aspect the signal at pos is supposed to show
-function advtrains.interlocking.signal_get_supposed_aspect(pos)
-	local sigd = advtrains.interlocking.db.get_sigd_for_signal(pos)
-	if sigd then
-		local tcbs = advtrains.interlocking.db.get_tcbs(sigd)
-		if tcbs.aspect then
-			return convert_aspect_if_necessary(tcbs.aspect)
-		end
-	end
-	return DANGER;
+function signal.notify_trains(pos)
+	local ipts, iconn = advtrains.interlocking.db.get_ip_by_signalpos(pos)
+	if not ipts then return end
+	local ipos = minetest.string_to_pos(ipts)
+
+	-- FIXME: invalidate_all_paths_ahead does not appear to always work as expected
+	--advtrains.invalidate_all_paths_ahead(ipos)
+	minetest.after(0, advtrains.invalidate_all_paths, ipos)
 end
 
--- Returns the actual aspect of the signal at position, as returned by the nodedef.
--- returns nil when there's no signal at the position
-function advtrains.interlocking.signal_get_aspect(pos)
-	local node=advtrains.ndb.get_node(pos)
-	local ndef=minetest.registered_nodes[node.name]
-	if ndef and ndef.advtrains and ndef.advtrains.get_aspect then
-		local asp = ndef.advtrains.get_aspect(pos, node)
-		if not asp then asp = DANGER end
-		return convert_aspect_if_necessary(asp)
+-- Update waiting trains and distant signals about a changed signal aspect
+-- Must be called when a signal's aspect changes through some other means
+-- and not via the signal mechanism
+function signal.notify_on_aspect_changed(pos, skip_dst_notify)
+	signal.notify_trains(pos)
+	if not skip_dst_notify then
+		signal.notify_distants_of(advtrains.encode_pos(pos), 2)
 	end
-	return nil
 end
 
--- Returns the "supported_aspects" of the signal at position, as returned by the nodedef.
--- returns nil when there's no signal at the position
-function advtrains.interlocking.signal_get_supported_aspects(pos)
-	local node=advtrains.ndb.get_node(pos)
-	local ndef=minetest.registered_nodes[node.name]
-	if ndef and ndef.advtrains and ndef.advtrains.supported_aspects then
-		local asp = ndef.advtrains.supported_aspects
-		return asp
-	end
-	return nil
+-- Gets the stored main aspect and distant signal position for this signal
+-- This information equals the information last passed to set_aspect
+-- It does not take into consideration the actual speed signalling, please use
+-- get_aspect_info() for this
+-- pos: the position of the signal
+-- returns: main_aspect, dst_pos
+function signal.get_aspect(pos)
+	local aspt = signal.aspects[advtrains.encode_pos(pos)]
+	local ma,dp = signal.get_aspect_internal(pos, aspt)
+	return ma, dp and advtrains.decode_pos(dp)
+end
+
+local function cache_mainaspects(ndefat)
+	ndefat.main_aspects_lookup = {}
+    for _,ma in ipairs(ndefat.main_aspects) do
+		ndefat.main_aspects_lookup[ma.name] = ma
+    end
+    ndefat.main_aspects_lookup[signal.MASP_HALT.name] = signal.MASP_HALT.name -- halt is always defined
+    ndefat.main_aspects_lookup[signal.MASP_DEFAULT.name] = ndefat.main_aspects[1] -- default is the first one
 end
 
-local players_assign_ip = {}
 
-local function ipmarker(ipos, connid)
-	local node_ok, conns, rhe = advtrains.get_rail_info_at(ipos, advtrains.all_tracktypes)
-	if not node_ok then return end
-	local yaw = advtrains.dir_to_angle(conns[connid].c)
+-- gets the main aspect. resolves named aspects to aspect table on demand
+function signal.get_aspect_internal(pos, aspt)
+	-- look up node and nodedef
+	local node = advtrains.ndb.get_node_or_nil(pos)
+	local ndef = node and minetest.registered_nodes[node.name]
+	if not aspt or not ndef then
+		-- oh, no main aspect, nevermind
+		return signal.MASP_HALT, nil, node, ndef
+	end
+	local ndefat = ndef.advtrains or {}
+	local masp = aspt.main or signal.MASP_HALT
 	
-	-- using tcbmarker here
-	local obj = minetest.add_entity(vector.add(ipos, {x=0, y=0.2, z=0}), "advtrains_interlocking:tcbmarker")
-	if not obj then return end
-	obj:set_yaw(yaw)
-	obj:set_properties({
-		textures = { "at_il_signal_ip.png" },
-	})
+	if type(masp) == "string" then
+		if masp=="_halt" then
+			masp = signal.MASP_HALT
+		elseif masp=="_default" and not ndefat.main_aspects then
+			-- case is fine, distant only signal
+			masp = signal.MASP_DEFAULT
+		else			
+			assert(ndefat.main_aspects, "With named aspects, node "..node.name.." needs advtrains.main_aspects table!")
+			-- resolve the main aspect from the mainaspects table
+			if not ndefat.main_aspects_lookup then
+				cache_mainaspects(ndefat)
+			end
+			masp = ndefat.main_aspects_lookup[aspt.main] or signal.MASP_DEFAULT
+		end
+	end
+	-- return whatever the main aspect is
+	return masp, aspt.remote, node, ndef
 end
 
--- shows small info form for signal IP state/assignment
--- only_notset: show only if it is not set yet (used by signal tcb assignment)
-function advtrains.interlocking.show_ip_form(pos, pname, only_notset)
-	if not minetest.check_player_privs(pname, "interlocking") then
-		return
-	end
-	local form = "size[7,5]label[0.5,0.5;" .. attrans("Signal at @1", minetest.pos_to_string(pos)).."]"
-	advtrains.interlocking.db.check_for_duplicate_ip(pos)
-	local pts, connid = advtrains.interlocking.db.get_ip_by_signalpos(pos)
-	if pts then
-		form = form.."label[0.5,1.5;" .. attrans("Influence point is set at @1/@2", pts, connid).."]"
-		form = form.."button_exit[0.5,2.5;  5,1;set;"..attrans("Move") .. "]"
-		form = form.."button_exit[0.5,3.5;  5,1;clear;" .. attrans("Clear") .. "]"
-		local ipos = minetest.string_to_pos(pts)
-		ipmarker(ipos, connid)
-	else
-		form = form.."label[0.5,1.5;" .. attrans("Influence point is not set.") .. "]"
-		form = form.."label[0.5,2.0;" .. attrans("It is recommended to set an influence point.") .. "]"
-		form = form.."label[0.5,2.5;" .. attrans("This is the point where trains will obey the signal.") .. "]"
+-- For the signal at pos, get the "aspect info" table. This contains the speed signalling information at this location
+function signal.get_aspect_info(pos)
+	-- get aspect internal
+	local aspt = signal.aspects[advtrains.encode_pos(pos)]
+	local masp, remote, node, ndef = signal.get_aspect_internal(pos, aspt)
+	-- call into ndef
+	if ndef and ndef.advtrains and ndef.advtrains.get_aspect_info then
+		local ai = ndef.advtrains.get_aspect_info
+		if type(ai)=="function" then
+			ai = ai(pos, masp)
+		end
+		if type(ai)=="table" then
+			--atdebug(pos,"aspectinfo",ai)
+			return ai
+		else
+			error("For node "..node.name..": ndef.advtrains.get_aspect_info must be function or table")
+		end
 		
-		form = form.."button_exit[0.5,3.5;  5,1;set;" .. attrans("Set") .. "]"
-	end
-	if not only_notset or not pts then
-		minetest.show_formspec(pname, "at_il_ipassign_"..minetest.pos_to_string(pos), form)
 	end
 end
 
-minetest.register_on_player_receive_fields(function(player, formname, fields)
-	local pname = player:get_player_name()
-	if not minetest.check_player_privs(pname, {train_operator=true, interlocking=true}) then
-		return
-	end
-	local pts = string.match(formname, "^at_il_ipassign_([^_]+)$")
-	local pos
-	if pts then
-		pos = minetest.string_to_pos(pts)
-	end
-	if pos then
-		if fields.set then
-			advtrains.interlocking.signal_init_ip_assign(pos, pname)
-		elseif fields.clear then
-			advtrains.interlocking.db.clear_ip_by_signalpos(pos)
+
+-- Called when either this signal has changed its main aspect
+-- or when this distant signal's currently assigned main signal has changed its aspect
+-- It retrieves the signal's main aspect and aspect info and calls apply_aspect of the node definition
+-- to update the signal's appearance and aspect info
+-- pts: The signal position to update as encoded_pos
+-- returns: the return value of the nodedef call which may be aspect_info
+function signal.reapply_aspect(pts)
+	-- get aspt
+	local aspt = signal.aspects[pts]
+	--atdebug("reapply_aspect",advtrains.decode_pos(pts),"aspt",aspt)
+	local pos = advtrains.decode_pos(pts)
+	-- resolve mainaspect table by name
+	local masp, remote, node, ndef = signal.get_aspect_internal(pos, aspt)
+	-- if we have remote, resolve remote
+	local rem_masp, rem_aspi
+	if remote then
+		-- register in remote signal as distant
+		if not signal.distant_refs[remote] then
+			signal.distant_refs[remote] = {}
+		end
+		signal.distant_refs[remote][pts] = true
+		local rem_aspt = signal.aspects[remote]
+		--atdebug("resolving remote",advtrains.decode_pos(remote),"aspt",rem_aspt)
+		local rem_pos = advtrains.decode_pos(remote)
+		local _,rem_ndef
+		rem_masp, _, _, rem_ndef = signal.get_aspect_internal(rem_pos, rem_aspt)
+		if rem_masp then
+			if rem_ndef.advtrains and rem_ndef.advtrains.get_aspect_info then
+				rem_aspi = rem_ndef.advtrains.get_aspect_info(rem_pos, rem_masp)
+			end
 		end
 	end
-end)
-
--- inits the signal IP assignment process
-function advtrains.interlocking.signal_init_ip_assign(pos, pname)
-	if not minetest.check_player_privs(pname, "interlocking") then
-		minetest.chat_send_player(pname, attrans("Insufficient privileges to use this!"))
-		return
+	-- call into ndef
+	--atdebug("applying to",pos,": main_asp",masp,"rem_masp",rem_masp,"rem_aspi",rem_aspi)
+	if ndef.advtrains and ndef.advtrains.apply_aspect then
+		ndef.advtrains.apply_aspect(pos, node, masp, rem_masp, rem_aspi)
 	end
-	--remove old IP
-	--advtrains.interlocking.db.clear_ip_by_signalpos(pos)
-	minetest.chat_send_player(pname, attrans("Configuring Signal: Please look in train's driving direction and punch rail to set influence point."))
-	
-	players_assign_ip[pname] = pos
+	-- notify trains
+	signal.notify_trains(pos)
 end
 
-minetest.register_on_punchnode(function(pos, node, player, pointed_thing)
-	local pname = player:get_player_name()
-	if not minetest.check_player_privs(pname, "interlocking") then
-		return
-	end
-	-- IP assignment
-	local signalpos = players_assign_ip[pname]
-	if signalpos then
-		if vector.distance(pos, signalpos)<=50 then
-			local node_ok, conns, rhe = advtrains.get_rail_info_at(pos, advtrains.all_tracktypes)
-			if node_ok and #conns == 2 then
-				
-				local yaw = player:get_look_horizontal()
-				local plconnid = advtrains.yawToClosestConn(yaw, conns)
-				
-				-- add assignment if not already present.
-				local pts = advtrains.roundfloorpts(pos)
-				if not advtrains.interlocking.db.get_ip_signal_asp(pts, plconnid) then
-					advtrains.interlocking.db.set_ip_signal(pts, plconnid, signalpos)
-					ipmarker(pos, plconnid)
-					minetest.chat_send_player(pname, attrans("Configuring Signal: Successfully set influence point"))
-				else
-					minetest.chat_send_player(pname, attrans("Configuring Signal: Influence point of another signal is already present!"))
-				end
-			else
-				minetest.chat_send_player(pname, attrans("Configuring Signal: This is not a normal two-connection rail! Aborted."))
-			end
-		else
-			minetest.chat_send_player(pname, attrans("Configuring Signal: Node is too far away. Aborted."))
+-- Update this signal's aspect based on the set route
+-- 
+function signal.update_route_aspect(tcbs, skip_dst_notify)
+	if tcbs.signal then
+		if not tcbs.route_aspect and signal.get_signal_cap_level(tcbs.signal) == 2 then
+			return
+			-- Special behavior for pure-distant signals assigned to TCBs: retain their last assigned main signal
+			-- and do not fall back to halt. This mirrors real-life, where the distant signal goes back to
+			-- expect halt only when the main signal falls into halt
 		end
-		players_assign_ip[pname] = nil
+		local asp = tcbs.route_aspect or "_halt"
+		local rem = tcbs.route_remote
+		signal.set_aspect(tcbs.signal, asp, rem, skip_dst_notify)
 	end
-end)
-
-
---== aspect selector ==--
-
-local players_aspsel = {}
+end
 
---[[
-suppasp: "supported_aspects" table
-purpose: form title string
-callback: func(pname, aspect) called on form submit
-isasp: aspect currently set
-]]
-function advtrains.interlocking.show_signal_aspect_selector(pname, p_suppasp, p_purpose, callback, isasp)
-	local suppasp = p_suppasp or {
-		main = {0, -1}, dst = {false}, shunt = false, info = {},
-	}
-	local purpose = p_purpose or ""
-	
-	local form = "size[7,7]label[0.5,0.5;" .. attrans("Select Signal Aspect:") .. "]"
-	form = form.."label[0.5,1;"..purpose.."]"
-	
-	form = form.."label[0.5,1.5;" .. attrans("== Main Signal ==") .. "]"
-	local selid = 1
-	local entries = {}
-	for idx, spv in ipairs(suppasp.main) do
-		local entry
-		if spv == 0 then
-			entry = attrans("Halt")
-		elseif spv == -1 then
-			entry = attrans("Continue at maximum speed")
-		elseif not spv then
-			entry = attrans("Continue\\, speed limit unchanged (no info)")
-		else
-			entry = attrans("Continue at speed of @1", spv)
-		end
-		-- hack: the crappy formspec system returns the label, not the index. save the index in it.
-		entries[idx] = idx.."| "..entry
-		if isasp and spv == (isasp.main or false) then
-			selid = idx
+-- Returns how capable the signal is with regards to aspect setting
+-- 0: not a signal at all
+-- 1: signal has get_aspect_info() but the aspect is not variable (e.g. a sign)
+-- 2: signal has apply_aspect() and main aspects but has "pure_distant" flag set (cannot be start/endpoint of a route, special behavior that its route aspect is not cleared on train pass)
+-- 3: signal has main signal role but can only ever display a halt aspect, such as a bumper (can be endpoint, but not startpoint, of a route)
+-- 4: Full capabilities, signal has main aspects and can be used as main/shunt signal (can be start/endpoint of a route)
+function signal.get_signal_cap_level(pos)
+	local node = advtrains.ndb.get_node_or_nil(pos)
+	local ndef = node and minetest.registered_nodes[node.name]
+	local ndefat = ndef and ndef.advtrains
+	if ndefat and ndefat.get_aspect_info then
+		if ndefat.apply_aspect and ndefat.main_aspects then
+			if not ndefat.pure_distant then
+				-- if the table contains anything, 4, otherwise 3
+				for _,_ in pairs(ndefat.main_aspects) do
+					return 4
+				end
+				return 3
+			end
+			return 2
 		end
+		return 1
 	end
-	form = form.."dropdown[0.5,2;6;main;"..table.concat(entries, ",")..";"..selid.."]"
+	return 0
+end
 
-	
-	form = form.."label[0.5,3;" .. attrans("== Shunting ==") .. "]"
-	if suppasp.shunt == nil then
-		local st = 1
-		if isasp and isasp.shunt then st=2 end
-		form = form.."dropdown[0.5,3.5;6;shunt_free;---," .. attrans("allowed") .. ";"..st.."]"
-	end
+----------------
 
-	form = form.."label[0.5,4.5;" .. attrans("== Distant Signal ==").."]"
-	local selid = 1
-	local entries = {}
-	for idx, spv in ipairs(suppasp.dst) do
-		local entry
-		if spv == 0 then
-			entry = attrans("Expect to stop at the next signal")
-		elseif spv == -1 then
-			entry = attrans("Expect to pass the next signal at maximum speed")
-		elseif not spv then
-			entry = attrans("No info")
-		else
-			entry = attrans("Expect to pass the next signal at speed of @1", string.format("%d", spv))
+function signal.can_dig(pos, player)
+	local sigd = advtrains.interlocking.db.get_sigd_for_signal(pos)
+	if sigd then
+		-- check privileges
+		if not player or not minetest.check_player_privs(player:get_player_name(), "interlocking") then
+			if not player then -- intermediate debug to uncover hard-to-find bugz
+				atwarn("advtrains.interlocking.signal.can_dig(",pos,") called with player==nil!")
+			end
+			return false
 		end
-		entries[idx] = idx.."| "..entry
-		if isasp and spv == (isasp.dst or false) then
-			selid = idx
+		-- check if route is set
+		local tcbs = advtrains.interlocking.db.get_tcbs(sigd)
+		if tcbs.routeset then
+			return false
 		end
 	end
-	form = form.."dropdown[0.5,5;6;dst;"..table.concat(entries, ",")..";"..selid.."]"
-
-	form = form.."button_exit[0.5,6;5,1;save;" .. attrans("Save signal aspect") .. "]"
-	
-	local token = advtrains.random_id()
-	
-	minetest.show_formspec(pname, "at_il_sigaspdia_"..token, form)
-	
-	minetest.after(1, function()
-	players_aspsel[pname] = {
-		suppasp = suppasp,
-		callback = callback,
-		token = token,
-	}
-	end)
+	return true
 end
 
-local function usebool(sup, val, free)
-	if sup == nil then
-		return val==free
-	else
-		return sup
+function signal.after_dig(pos, oldnode, oldmetadata, player)
+	-- unassign signal if necessary
+	local sigd = advtrains.interlocking.db.get_sigd_for_signal(pos)
+	if sigd then
+		advtrains.interlocking.db.unassign_signal_for_tcbs(sigd)
+		minetest.chat_send_player(player:get_player_name(), "Signal has been unassigned. Name and routes are kept for reuse.")
+	end
+	-- clear influence point
+	local ipts,iconnid = advtrains.interlocking.db.get_ip_by_signalpos(pos)
+	if ipts then
+		advtrains.interlocking.db.clear_ip_signal(ipts, iconnid)
 	end
+	advtrains.interlocking.signal.unregister_aspect(pos)
 end
 
--- other side of hack: extract the index
-local function ddindex(val)
-	return tonumber(string.match(val, "^(%d+)|"))
+function signal.on_rightclick(pos, node, player, itemstack, pointed_thing)
+	local pname = player:get_player_name()
+	local control = player:get_player_control()
+	advtrains.interlocking.show_signal_form(pos, node, pname, control.aux1)
 end
 
--- TODO use non-hacky way to parse outputs
-
-minetest.register_on_player_receive_fields(function(player, formname, fields)
-	local pname = player:get_player_name()
-	local psl = players_aspsel[pname]
-	if psl then
-		if formname == "at_il_sigaspdia_"..psl.token then
-			if fields.save then
-				local maini = ddindex(fields.main)
-				if not maini then return end
-				local dsti = ddindex(fields.dst)
-				if not dsti then return end
-				local asp = {
-					main = psl.suppasp.main[maini],
-					dst = psl.suppasp.dst[dsti],
-					shunt = usebool(psl.suppasp.shunt, fields.shunt_free, attrans("allowed")),
-					info = {}
-				}
-				psl.callback(pname, asp)
-			end
-		else
-			players_aspsel[pname] = nil
-		end
-	end
-	
-end)
+advtrains.interlocking.signal = signal
diff --git a/advtrains_interlocking/signal_aspect_ui.lua b/advtrains_interlocking/signal_aspect_ui.lua
new file mode 100644
index 0000000..98a332a
--- /dev/null
+++ b/advtrains_interlocking/signal_aspect_ui.lua
@@ -0,0 +1,281 @@
+local F = advtrains.formspec
+
+function advtrains.interlocking.show_signal_form(pos, node, pname, aux_key)
+	local sigd = advtrains.interlocking.db.get_sigd_for_signal(pos)
+	if sigd and not aux_key then
+		advtrains.interlocking.show_signalling_form(sigd, pname)
+	else
+		if advtrains.interlocking.signal.get_signal_cap_level(pos) >= 2 then
+			advtrains.interlocking.show_ip_sa_form(pos, pname)
+		else
+			advtrains.interlocking.show_ip_form(pos, pname)
+		end
+	end
+end
+
+local players_assign_ip = {}
+local players_assign_distant = {}
+
+local function ipmarker(ipos, connid)
+	local node_ok, conns, rhe = advtrains.get_rail_info_at(ipos, advtrains.all_tracktypes)
+	if not node_ok then return end
+	local yaw = advtrains.dir_to_angle(conns[connid].c)
+
+	-- using tcbmarker here
+	local obj = minetest.add_entity(vector.add(ipos, {x=0, y=0.2, z=0}), "advtrains_interlocking:tcbmarker")
+	if not obj then return end
+	obj:set_yaw(yaw)
+	obj:set_properties({
+		textures = { "at_il_signal_ip.png" },
+	})
+end
+
+function advtrains.interlocking.make_ip_formspec_component(pos, x, y, w)
+	advtrains.interlocking.db.check_for_duplicate_ip(pos)
+	local pts, connid = advtrains.interlocking.db.get_ip_by_signalpos(pos)
+	if pts then
+		-- display marker
+		local ipos = minetest.string_to_pos(pts)
+		ipmarker(ipos, connid)
+		return table.concat {
+			F.S_label(x, y, "Influence point is set at @1.", string.format("%s/%s", pts, connid)),
+			F.S_button_exit(x, y+0.5, w/2-0.125, "ip_set", "Modify"),
+			F.S_button_exit(x+w/2+0.125, y+0.5, w/2-0.125, "ip_clear", "Clear"),
+		}
+	else
+		return table.concat {
+			F.S_label(x, y, "Influence point is not set."),
+			F.S_button_exit(x, y+0.5, w, "ip_set", "Set influence point"),
+		}
+	end
+end
+
+-- shows small formspec to set the signal influence point
+-- only_notset: show only if it is not set yet (used by signal tcb assignment)
+function advtrains.interlocking.show_ip_form(pos, pname, only_notset)
+	if not minetest.check_player_privs(pname, "interlocking") then
+		return
+	end
+	local ipform = advtrains.interlocking.make_ip_formspec_component(pos, 0.5, 0.5, 7)
+	local form = {
+		"formspec_version[4]",
+		"size[8,2.25]",
+		ipform,
+	}
+	if not only_notset or not pts then
+		minetest.show_formspec(pname, "at_il_ipsaform_"..minetest.pos_to_string(pos), table.concat(form))
+	end
+end
+
+-- shows larger formspec to set the signal influence point, main aspect and distant signal pos
+-- only_notset: show only if it is not set yet (used by signal tcb assignment)
+function advtrains.interlocking.show_ip_sa_form(pos, pname)
+	if not minetest.check_player_privs(pname, "interlocking") then
+		return
+	end
+	local ipform = advtrains.interlocking.make_ip_formspec_component(pos, 0.5, 0.5, 7)
+	local ma, rpos = advtrains.interlocking.signal.get_aspect(pos)
+	local form = {
+		"formspec_version[4]",
+		"size[8,4.5]",
+		ipform,
+	}
+	-- Create Signal aspect formspec elements
+	local ndef = advtrains.ndb.get_ndef(pos)
+	if ndef and ndef.advtrains then
+		form[#form+1] = F.label(0.5, 2, "Signal Aspect:")
+		-- main aspect list
+		if ndef.advtrains.main_aspects then
+			local entries = { "<none>" }
+			local sel = 1
+			for i, mae in ipairs(ndef.advtrains.main_aspects) do
+				entries[i+1] = mae.description
+				if ma and ma.name == mae.name then
+					sel = i+1
+				end
+			end
+			form[#form+1] = F.dropdown(0.5, 2.5, 4, "sa_mainaspect", entries, sel, true)
+		end
+		-- distant signal assign (is shown either when main_aspect is not none, or when pure distant signal)
+		if rpos then
+			form[#form+1] = F.button_exit(0.5, 3.5, 4, "sa_undistant", "Dst: " .. minetest.pos_to_string(rpos))
+		elseif (ma and not ma.halt) or not ndef.advtrains.main_aspects then
+			form[#form+1] = F.button_exit(0.5, 3.5, 4, "sa_distant", "<assign distant>")
+		end
+	end
+	
+	minetest.show_formspec(pname, "at_il_ipsaform_"..minetest.pos_to_string(pos), table.concat(form))
+end
+
+function advtrains.interlocking.handle_ip_sa_formspec_fields(pname, pos, fields)
+	if not (pos and minetest.check_player_privs(pname, {train_operator=true, interlocking=true})) then
+		return
+	end
+	local ma, rpos = advtrains.interlocking.signal.get_aspect(pos)
+	-- mainaspect dropdown
+	if fields.sa_mainaspect then
+		local idx = tonumber(fields.sa_mainaspect)
+		local new_ma = nil
+		if idx > 1 then
+			local ndef = advtrains.ndb.get_ndef(pos)
+			if ndef and ndef.advtrains and ndef.advtrains.main_aspects then
+				new_ma = ndef.advtrains.main_aspects[idx - 1]
+			end
+		end
+		if new_ma then
+			advtrains.interlocking.signal.set_aspect(pos, new_ma.name, rpos)
+		else
+			-- reset everything
+			advtrains.interlocking.signal.clear_aspect(pos)
+		end
+		
+	end
+	-- buttons
+	if fields.ip_set then
+		advtrains.interlocking.init_ip_assign(pos, pname)
+		return
+	elseif fields.ip_clear then
+		advtrains.interlocking.db.clear_ip_by_signalpos(pos)
+		return
+	elseif fields.sa_distant then
+		advtrains.interlocking.init_distant_assign(pos, pname)
+		return
+	elseif fields.sa_undistant then
+		advtrains.interlocking.signal.set_aspect(pos, ma.name, nil)
+		return
+	end
+	-- show the form again unless one of the buttons was clicked
+	if not fields.quit then
+		advtrains.interlocking.show_ip_sa_form(pos, pname)
+	end
+end
+
+minetest.register_on_player_receive_fields(function(player, formname, fields)
+	local pname = player:get_player_name()
+	local pts = string.match(formname, "^at_il_ipsaform_([^_]+)$")
+	local pos
+	if pts then
+		pos = minetest.string_to_pos(pts)
+	end
+	if pos then
+		advtrains.interlocking.handle_ip_sa_formspec_fields(pname, pos, fields)
+	end
+end)
+
+-- inits the signal IP assignment process
+function advtrains.interlocking.init_ip_assign(pos, pname)
+	if not minetest.check_player_privs(pname, "interlocking") then
+		minetest.chat_send_player(pname, "Insufficient privileges to use this!")
+		return
+	end
+	--remove old IP
+	--advtrains.interlocking.db.clear_ip_by_signalpos(pos)
+	minetest.chat_send_player(pname, "Configuring Signal: Please look in train's driving direction and punch rail to set influence point.")
+	
+	players_assign_ip[pname] = pos
+end
+
+-- inits the distant signal assignment process
+function advtrains.interlocking.init_distant_assign(pos, pname)
+	if not minetest.check_player_privs(pname, "interlocking") then
+		minetest.chat_send_player(pname, "Insufficient privileges to use this!")
+		return
+	end
+	minetest.chat_send_player(pname, "Set distant signal: Punch the main signal to assign!")
+	
+	players_assign_distant[pname] = pos
+end
+
+-- Tries to automatically find a TCB to assign to the signal, or a main signal if this is a pure distant signal and another signal is found before the TCB
+local function try_auto_assign_to_tcb(signalpos, pos, connid, pname)
+	local pure_distant = advtrains.interlocking.signal.get_signal_cap_level(signalpos) == 2 -- exactly 2: pure distant sig
+	local is_past_first = false
+	local ti = advtrains.get_track_iterator(pos, connid, pure_distant and 150 or 16, false) -- maximum 16 track nodes ahead
+	local apos, aconnid = ti:next_branch()
+	while apos do
+		-- check for presence of a tcb
+		local tcb = advtrains.interlocking.db.get_tcb(apos)
+		if tcb then
+			-- check on the pointing connid whether it has a signal already
+			if not tcb[aconnid].signal then
+				-- go ahead and assign
+				local sigd = { p=apos, s=aconnid }
+				advtrains.interlocking.db.assign_signal_to_tcbs(signalpos, sigd)
+				-- use auto-naming
+				advtrains.interlocking.add_autoname_to_tcbs(tcb[aconnid], pname)
+				minetest.chat_send_player(pname, "Assigned signal to the TCB at "..core.pos_to_string(apos))
+				advtrains.interlocking.show_tcb_marker(apos)
+				advtrains.interlocking.show_signalling_form(sigd, pname)
+			end
+			-- in all cases return
+			return
+		elseif pure_distant and is_past_first then
+			-- try to find another signal's influence point here which could be the remote of a distant signal
+			local pts = advtrains.roundfloorpts(apos)
+			local mainsig = advtrains.interlocking.db.get_ip_signal(pts, aconnid)
+			if mainsig and advtrains.interlocking.signal.get_signal_cap_level(mainsig) >= 3 then
+				advtrains.interlocking.signal.set_aspect(signalpos, "_default", mainsig)
+				minetest.chat_send_player(pname, "Assigned distant signal to the main signal at "..core.pos_to_string(mainsig))
+				return
+			end
+		end
+		apos, aconnid = ti:next_track()
+		is_past_first = true
+	end
+	-- if we end up here limit is up
+end
+
+minetest.register_on_punchnode(function(pos, node, player, pointed_thing)
+	local pname = player:get_player_name()
+	if not minetest.check_player_privs(pname, "interlocking") then
+		return
+	end
+	-- IP assignment
+	local signalpos = players_assign_ip[pname]
+	if signalpos then
+		if vector.distance(pos, signalpos)<=50 then
+			local node_ok, conns, rhe = advtrains.get_rail_info_at(pos, advtrains.all_tracktypes)
+			if node_ok and #conns == 2 then
+				
+				local yaw = player:get_look_horizontal()
+				local plconnid = advtrains.yawToClosestConn(yaw, conns)
+				
+				-- add assignment if not already present.
+				local pts = advtrains.roundfloorpts(pos)
+				if not advtrains.interlocking.db.get_ip_signal_asp(pts, plconnid) then
+					advtrains.interlocking.db.set_ip_signal(pts, plconnid, signalpos)
+					ipmarker(pos, plconnid)
+					minetest.chat_send_player(pname, "Configuring Signal: Successfully set influence point")
+					-- Try to find a TCB ahead and auto assign this signal there
+					if advtrains.interlocking.signal.get_signal_cap_level(signalpos) >= 2 then
+						try_auto_assign_to_tcb(signalpos, pos, plconnid, pname)
+					end
+				else
+					minetest.chat_send_player(pname, "Configuring Signal: Influence point of another signal is already present!")
+				end
+			else
+				minetest.chat_send_player(pname, "Configuring Signal: This is not a normal two-connection rail! Aborted.")
+			end
+		else
+			minetest.chat_send_player(pname, "Configuring Signal: Node is too far away. Aborted.")
+		end
+		players_assign_ip[pname] = nil
+	end
+	-- DST assignment
+	signalpos = players_assign_distant[pname]
+	if signalpos then
+		-- get current mainaspect
+		local ma, rpos = advtrains.interlocking.signal.get_aspect(signalpos)
+		-- if punched pos is valid signal then set it as the new remote, otherwise nil
+		local nrpos
+		if advtrains.interlocking.signal.get_signal_cap_level(pos) > 1 then
+			nrpos = pos
+			if not ma or ma.halt then -- make sure that dst is never set without a main aspect (esp. for pure distant signal case)
+				ma = "_default"
+			end
+			advtrains.interlocking.signal.set_aspect(signalpos, ma, nrpos)
+		end
+		players_assign_distant[pname] = nil
+	end
+end)
+
diff --git a/advtrains_interlocking/smartroute.lua b/advtrains_interlocking/smartroute.lua
new file mode 100644
index 0000000..f03ece0
--- /dev/null
+++ b/advtrains_interlocking/smartroute.lua
@@ -0,0 +1,257 @@
+-- smartroute.lua
+-- Implementation of the advtrains auto-route search
+
+local atil = advtrains.interlocking
+local ildb = atil.db
+local sr = {}
+
+
+-- Start the SmartRoute process. This searches for routes and tries to match them with existing routes, showing them in a form
+function sr.start(pname, sigd)
+	-- is start signal a shunt signal? This becomes default setting for searching_shunt
+	local is_startsignal_shunt = false
+	local tcbs = ildb.get_tcbs(sigd)
+	if tcbs.signal then
+		local ndef = advtrains.ndb.get_ndef(tcbs.signal)
+		if ndef and ndef.advtrains then
+			if ndef.advtrains.route_role == "shunt" then
+				is_startsignal_shunt = true
+			end
+		end
+	end
+	sr.propose_next(pname, sigd, 0, is_startsignal_shunt)
+end
+
+
+local function otherside(s)
+	if s==1 then return 2 else return 1 end
+end
+
+--route search implementation
+-- new 2025-01-06: rely on the already present info from rscache to traverse sections
+-- this allows to implement a breadth first search
+-- format of foundroute:
+-- { name = "the name", tcbseq = { list of sigds in sequence, not containing the start sigd }}
+
+local function build_route_from_foundroute(froute, name)
+	local route = {
+		name = froute.name,
+		use_rscache = true,
+		smartroute_generated = true,
+	}
+	for _, sigd in ipairs(froute.tcbseq) do
+		route[#route+1] = { next = sigd, locks = {} }
+	end
+	return route
+end
+
+-- Maximum num of sections for routes to be found
+local RTE_MAX_SECS = 16
+
+-- scan for possible routes from the start tcb in a bread-first-search manner
+-- find_more_than: search is aborted only if more than the specified number of routes are found
+function sr.rescan(pname, sigd, tcbs, find_more_than, searching_shunt, pname)
+	local found_routes = {}
+	local restart_tcbs = { {sigd = sigd, tcbseq = {} } }
+	local last_len = 0
+	while true do
+		-- take first entry out of restart_tcbs (due to the way it is inserted the first entry will always be the one with the lowest length
+		local cur_restart
+		for idx, rst in ipairs(restart_tcbs) do
+			cur_restart = rst
+			table.remove(restart_tcbs, idx)
+			break
+		end
+		if not cur_restart then
+			-- we have no candidates left. Give up and return what we have
+			--atdebug("(SR) No Candidates left, end rescan")
+			return found_routes
+		end
+		-- check if we need to stop due to having found enough routes
+		local cur_len = #cur_restart.tcbseq
+		if cur_len > last_len then
+			-- one level is finished, check if enoufh routes are found
+			if #found_routes > find_more_than then
+				--atdebug("(SR) Layer finished and enough routes found, end rescan")
+				return found_routes
+			end
+			last_len = cur_len
+		end
+		-- our current restart point is nouw in cur_restart
+		local c_sigd = cur_restart.sigd
+		--atdebug("(SR) Search continues at",c_sigd,"seqlen",#cur_restart.tcbseq)
+		-- do a TS repair, this also updates the RS cache should it be out of date
+		local c_ts_id = ildb.check_and_repair_ts_at_pos(c_sigd.p, c_sigd.s, pname, false)
+		if c_ts_id then
+			local c_ts = ildb.get_ts(c_ts_id)
+			local bgn_pts = advtrains.encode_pos(c_sigd.p)
+			local rsout = c_ts.rs_cache[bgn_pts]
+			if rsout then
+				for _, end_sigd in ipairs(c_ts.tc_breaks) do
+					end_pkey = advtrains.encode_pos(end_sigd.p)
+					if rsout[end_pkey] then
+						--atdebug("(SR) Section",c_ts_id,c_ts.name,"has way",c_sigd,"->",end_sigd)
+						local nsigd = {p=end_sigd.p, s = end_sigd.s==1 and 2 or 1} -- invert to other side
+						-- record nsigd in the tcbseq
+						local ntcbseq = table.copy(cur_restart.tcbseq)
+						ntcbseq[#ntcbseq+1] = nsigd
+						local shall_continue = true
+						-- check if that sigd is a route target
+						local tcbs = ildb.get_tcbs(nsigd)
+                        if tcbs.signal then
+							local ndef = advtrains.ndb.get_ndef(tcbs.signal)
+							if ndef and ndef.advtrains then
+								if ndef.advtrains.route_role == "main" or ndef.advtrains.route_role == "main_distant"
+											or ndef.advtrains.route_role == "end" or ndef.advtrains.route_role == "shunt" then
+									-- signal is suitable target
+									local is_mainsignal = ndef.advtrains.route_role ~= "shunt"
+									--atdebug("(SR) Suitable end signal at",nsigd,", recording route!")
+									-- record the found route in the results
+									found_routes[#found_routes+1] = {
+											tcbseq = ntcbseq,
+											shunt_route = not is_mainsignal,
+											name = tcbs.signal_name or atil.sigd_to_string(nsigd)
+									}
+									-- if this is a main signal and/or we are only searching shunt routes, stop the search here
+									if is_mainsignal or searching_shunt then
+											--atdebug("(SR) Not continuing this branch!")
+											shall_continue = false
+									end
+								end
+							end
+                        end
+						-- unless overridden, insert the next restart point
+						if shall_continue then
+							restart_tcbs[#restart_tcbs+1] =  {sigd = nsigd, tcbseq = ntcbseq } 
+						end
+					end
+				end
+			else
+				--atdebug("(SR) Section",c_ts_id,c_ts.name,"found no rscache entry for start ",bgn_pts)
+			end
+		else
+			--atdebug("(SR) Stop at",c_sigd,"because no sec ahead")
+		end
+	end
+end
+
+local players_smartroute_actions = {}
+-- Propose to pname the smartroute actions in a form, with the current settings as passed to this function
+function sr.propose_next(pname, sigd, find_more_than, searching_shunt)
+	local tcbs = ildb.get_tcbs(sigd)
+	if not tcbs or not tcbs.routes then
+		minetest.chat_send_player(pname, "Smartroute: TCBS or routes don't exist here!")
+		return
+	elseif not tcbs.ts_id then
+		minetest.chat_send_player(pname, "Smartroute: No track section directly ahead!")
+		return
+	end
+	-- Step 1: search for routes using the current settings
+	local found_routes = sr.rescan(pname, sigd, tcbs, find_more_than, searching_shunt, pname)
+	-- Step 2: store in actions table
+	players_smartroute_actions[pname] = {
+		sigd = sigd,
+		searching_shunt = searching_shunt,
+		found_routes = found_routes
+	}
+	-- step 3: build form
+	local form = "size[5,5]label[0,0;Route search: "..#found_routes.." found]"
+	local tab = {}
+	for idx, froute in ipairs(found_routes) do
+		tab[idx] = minetest.formspec_escape(froute.name.." (Len="..#froute.tcbseq..")")
+	end
+	form=form.."textlist[0.5,1;4,3;rtelist;"..table.concat(tab, ",").."]"
+	form=form.."button[0.5,4;2,1;continue;Search further]"
+	form=form.."button[2.5,4;2,1;apply;Apply]"
+	
+	minetest.show_formspec(pname, "at_il_smartroute_propose", form)
+end
+
+minetest.register_on_player_receive_fields(function(player, formname, fields)
+	local pname = player:get_player_name()
+	if not minetest.check_player_privs(pname, "interlocking") then
+		return
+	end
+	if formname ~= "at_il_smartroute_propose" then
+		return
+	end
+	-- retrieve from the storage the current search result
+	local srtab = players_smartroute_actions[pname]
+	if not srtab then
+		return
+	end
+	local sigd = srtab.sigd
+	local found_routes = srtab.found_routes
+	
+	if fields.continue then
+		-- search on, but find at least one route more
+		sr.propose_next(pname, sigd, #found_routes, srtab.searching_shunt)
+		return
+	end
+	
+	if fields.apply then
+		-- user is happy with the found routes. Proceed to save them in the signal
+		local tcbs = ildb.get_tcbs(sigd)
+		if not tcbs then return end
+		-- remove routes for endpoints for which routes already exist
+		local ex_endpts = {} -- key = sigd_to_string
+		for rtid, route in ipairs(tcbs.routes) do
+			local valid = advtrains.interlocking.check_route_valid(route, sigd)
+			local endpoint = route[#route].next -- 'next' field of the last route segment (the segment with index==len)
+			if valid and endpoint then
+				local endstr = advtrains.interlocking.sigd_to_string(endpoint)
+				--atdebug("(Smartroute) Find existing endpoint:",route.name,"ends at",endstr)
+				ex_endpts[endstr] = route.name
+			else
+				--atdebug("(Smartroute) Find existing endpoint:",route.name," not considered, endpoint",endpoint,"valid",valid)
+			end
+		end
+		local new_frte = {}
+		for _,froute in ipairs(found_routes) do
+			local endpoint = froute.tcbseq[#froute.tcbseq]
+			local endstr = advtrains.interlocking.sigd_to_string(endpoint)
+			if not ex_endpts[endstr] then
+				new_frte[#new_frte+1] = froute
+			else
+				--atdebug("(Smartroute) Throwing away",froute.name,"because endpoint",endstr,"already reached by route",ex_endpts[endstr])
+			end
+		end
+		
+		-- All remaining routes will be applied to the signal
+		local sel_rte = #tcbs.routes+1
+		for idx, froute in ipairs(new_frte) do
+			tcbs.routes[#tcbs.routes+1] = build_route_from_foundroute(froute)
+		end
+		-- if only one route present and it is newly created (there was no route before, thus sel_rte==1), make default
+		if sel_rte == 1 and #tcbs.routes == 1 then
+			local route1 = tcbs.routes[1]
+			route1.ars = {default=true}
+			-- if that only route furthermore is a suitable block signal route (1 section with no locks), set it into block signal mode
+			if #route1 == 1 then
+				local ts = tcbs.ts_id and advtrains.interlocking.db.get_ts(tcbs.ts_id)
+				if ts and #ts.tc_breaks == 2 then
+					-- check for presence of any locks
+					local epos1 = advtrains.encode_pos(ts.tc_breaks[1].p)
+					local epos2 = advtrains.encode_pos(ts.tc_breaks[2].p)
+					local haslocks =
+							(route1[1].locks and next(route1[1].locks)) -- the route itself has no locks
+							or (ts.fixed_locks and next(ts.fixed_locks)) -- the section has no fixedlocks
+							or (ts.rs_cache and ts.rs_cache[epos1] and ts.rs_cache[epos1][epos2] and next(ts.rs_cache[epos1][epos2])) -- the section has no locks in rscache
+					if not haslocks then
+						-- yeah, blocksignal!
+						route1.default_autoworking = true
+					end
+				end
+			end
+		end
+		--atdebug("Smartroute done!")
+		advtrains.interlocking.show_signalling_form(sigd, pname, sel_rte)
+		players_smartroute_actions[pname] = nil
+	end
+	if fields.quit then
+		players_smartroute_actions[pname] = nil
+	end
+end)
+
+
+advtrains.interlocking.smartroute = sr
diff --git a/advtrains_interlocking/spec/basic_signalling_spec.lua b/advtrains_interlocking/spec/basic_signalling_spec.lua
new file mode 100644
index 0000000..a4e1e3a
--- /dev/null
+++ b/advtrains_interlocking/spec/basic_signalling_spec.lua
@@ -0,0 +1,106 @@
+--[[
+This file tests a large part of the signaling system, as a lot of tests for the
+signaling system tend to overlap for various parts of the system.
+]]
+
+require("mineunit")
+mineunit("core")
+
+_G.advtrains = {
+	interlocking = {
+		aspect = fixture("../../aspect"),
+	},
+	ndb = {
+		get_node = minetest.get_node,
+		swap_node = minetest.swap_node,
+	}
+}
+
+fixture("advtrains_helpers")
+fixture("../../database")
+sourcefile("distant")
+sourcefile("signal_api")
+sourcefile("signal_aspect_accessors")
+fixture("../../demosignals")
+
+minetest.register_node("advtrains_interlocking:signal_sign", {
+	advtrains = {
+		get_aspcet = function() return {main = 19} end
+	}
+})
+
+local D = advtrains.distant
+local I = advtrains.interlocking
+local A = I.aspect
+
+local stub_aspect_t1 = {
+	free = {main = -1},
+	slow = {main = 6},
+	danger = {main = 0, shunt = false},
+}
+for k, v in pairs(stub_aspect_t1) do
+	stub_aspect_t1[k] = A(v)
+end
+local stub_pos_t1 = {}
+for i = 1, 4 do
+	stub_pos_t1[i] = {x = 1, y = 0, z = i}
+end
+
+world.layout {
+	{stub_pos_t1[1], "advtrains_interlocking:ds_danger"},
+	{stub_pos_t1[2], "advtrains_interlocking:ds_slow"},
+	{stub_pos_t1[3], "advtrains_interlocking:ds_free"},
+	{stub_pos_t1[4], "advtrains_interlocking:signal_sign"},
+}
+
+describe("API for supposed signal aspects", function()
+	it("should load and save data properly", function()
+		local tbl = {_foo = {}}
+		I.load_supposed_aspects(tbl)
+		assert.same(tbl, I.save_supposed_aspects())
+	end)
+	it("should set and get signals properly", function ()
+		local pos = stub_pos_t1[2]
+		local asp = stub_aspect_t1.slow
+		local newasp = A{ main = math.random(1,5) }
+		assert.equal(asp, I.signal_get_aspect(pos))
+		I.signal_set_aspect(pos, newasp)
+		assert.equal(newasp, I.signal_get_aspect(pos))
+		assert.equal(asp, I.signal_get_real_aspect(pos))
+		I.signal_set_aspect(pos, asp)
+	end)
+end)
+
+describe("Distant signaling", function()
+	it("should assign distant signals and set the distant aspect correspondingly", function()
+		for i = 1, 2 do
+			D.assign(stub_pos_t1[i], stub_pos_t1[i+1])
+		end
+		assert.equal(stub_aspect_t1.danger, I.signal_get_aspect(stub_pos_t1[1]))
+		assert.equal(A{main = 6, dst = 0}, I.signal_get_aspect(stub_pos_t1[2]))
+		assert.equal(A{main = -1, dst = 6}, I.signal_get_aspect(stub_pos_t1[3]))
+	end)
+	it("should report assignments properly", function()
+		assert.same({stub_pos_t1[1], "manual"}, {D.get_main(stub_pos_t1[2])})
+		assert.same({[advtrains.encode_pos(stub_pos_t1[3])] = "manual"}, D.get_dst(stub_pos_t1[2]))
+	end)
+	it("should update distant aspects automatically", function()
+		I.signal_set_aspect(stub_pos_t1[2], {main = 2, dst = -1})
+		assert.equal(A{main = 2, dst = 0}, I.signal_get_aspect(stub_pos_t1[2]))
+		assert.equal(A{main = -1, dst = 2}, I.signal_get_aspect(stub_pos_t1[3]))
+	end)
+	it("should unassign signals when one is removed", function()
+		world.set_node(stub_pos_t1[2], "air")
+		assert.same({}, D.get_dst(stub_pos_t1[1]))
+		assert.same({}, {D.get_main(stub_pos_t1[3])})
+		assert.same(stub_aspect_t1.free, I.signal_get_aspect(stub_pos_t1[3]))
+	end)
+	it("should reject signal signs", function()
+		D.assign(stub_pos_t1[1], stub_pos_t1[4])
+		assert.same({}, D.get_dst(stub_pos_t1[1]))
+		assert.same({}, {D.get_main(stub_pos_t1[4])})
+		D.assign(stub_pos_t1[4], stub_pos_t1[1])
+		assert.same({}, D.get_dst(stub_pos_t1[4]))
+		assert.same({}, {D.get_main(stub_pos_t1[1])})
+	end)
+end)
diff --git a/advtrains_interlocking/spec/fixtures/advtrains_helpers.lua b/advtrains_interlocking/spec/fixtures/advtrains_helpers.lua
new file mode 120000
index 0000000..9b0ab67
--- /dev/null
+++ b/advtrains_interlocking/spec/fixtures/advtrains_helpers.lua
@@ -0,0 +1 @@
+../../../advtrains/helpers.lua
\ No newline at end of file
diff --git a/advtrains_interlocking/spec/mineunit.conf b/advtrains_interlocking/spec/mineunit.conf
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/advtrains_interlocking/spec/mineunit.conf
diff --git a/advtrains_interlocking/spec/signal_group_spec.lua b/advtrains_interlocking/spec/signal_group_spec.lua
new file mode 100644
index 0000000..bc9d007
--- /dev/null
+++ b/advtrains_interlocking/spec/signal_group_spec.lua
@@ -0,0 +1,95 @@
+require "mineunit"
+mineunit("core")
+
+_G.advtrains = {
+	interlocking = {
+		aspect = sourcefile("aspect"),
+	},
+	ndb = {
+		get_node = minetest.get_node,
+		swap_node = minetest.swap_node,
+	}
+}
+
+fixture("advtrains_helpers")
+sourcefile("database")
+sourcefile("signal_api")
+sourcefile("distant")
+sourcefile("signal_aspect_accessors")
+
+local A = advtrains.interlocking.aspect
+local D = advtrains.distant
+local I = advtrains.interlocking
+local N = advtrains.ndb
+
+local groupdef = {
+	name = "foo",
+	aspects = {
+		proceed = {main = -1},
+		caution = {},
+		danger = {main = 0},
+		"proceed",
+		{"caution"},
+		"danger",
+	},
+}
+
+for k, v in pairs(groupdef.aspects) do
+	minetest.register_node("advtrains_interlocking:" .. k, {
+		advtrains = {
+			supported_aspects = {
+				group = "foo",
+			},
+			get_aspect = function() return A{group = "foo", name = k} end,
+			set_aspect = function(pos, _, name)
+				N.swap_node(pos, {name = "advtrains_interlocking:" .. name})
+			end,
+		}
+	})
+end
+
+local origin = vector.new(0, 0, 0)
+local dstpos = vector.new(0, 0, 1)
+
+world.layout {
+	{origin, "advtrains_interlocking:danger"},
+	{dstpos, "advtrains_interlocking:proceed"},
+}
+
+describe("signal group registration", function()
+	it("should work", function()
+		A.register_group(groupdef)
+		assert(A.get_group_definition("foo"))
+	end)
+	it("should only be allowed once for the same group", function()
+		assert.has.errors(function() A.register_group(type2def) end)
+	end)
+	it("should handle nonexistant groups", function()
+		assert.is_nil(A.get_group_definition("something_else"))
+	end)
+	it("should reject invalid definitions", function()
+		assert.has.errors(function() A.register_group({}) end)
+		assert.has.errors(function() A.register_group({name="",label={}}) end)
+		assert.has.errors(function() A.register_group({name="",aspects={}}) end)
+	end)
+end)
+
+describe("signal aspect", function()
+	it("should handle empty fields properly", function()
+		assert.equal(A{main = 0}, A{group="foo", name="danger"}:to_group())
+	end)
+	it("should be converted properly", function()
+		assert.equal(A{main = 0}, A{group="foo", name="danger"})
+		assert.equal(A{}, A{group="foo", name="caution"})
+		assert.equal(A{main = -1}, A{group="foo", name="proceed"})
+	end)
+end)
+
+describe("signals in groups", function()
+	it("should support distant signaling", function()
+		assert.equal("caution", A():adjust_distant(A{group="foo",name="danger"}).name)
+		assert.equal("proceed", A():adjust_distant(A{group="foo",name="caution"}).name)
+		assert.equal("proceed", A():adjust_distant(A{group="foo",name="proceed"}).name)
+		assert.equal("danger", A{group="foo",name="danger"}:adjust_distant{}.name)
+	end)
+end)
diff --git a/advtrains_interlocking/tcb_ts_ui.lua b/advtrains_interlocking/tcb_ts_ui.lua
index 263a1f0..9a44b4d 100644
--- a/advtrains_interlocking/tcb_ts_ui.lua
+++ b/advtrains_interlocking/tcb_ts_ui.lua
@@ -2,8 +2,11 @@
 
 local players_assign_tcb = {}
 local players_assign_signal = {}
+local players_assign_xlink = {}
 local players_link_ts = {}
+local players_assign_fixedlocks = {}
 
+local atil = advtrains.interlocking
 local ildb = advtrains.interlocking.db
 local ilrs = advtrains.interlocking.route
 
@@ -14,6 +17,7 @@ local lntrans = { "A", "B" }
 local function sigd_to_string(sigd)
 	return minetest.pos_to_string(sigd.p).." / "..lntrans[sigd.s]
 end
+advtrains.interlocking.sigd_to_string = sigd_to_string
 
 minetest.register_node("advtrains_interlocking:tcb_node", {
 	drawtype = "mesh",
@@ -88,12 +92,8 @@ minetest.register_node("advtrains_interlocking:tcb_node", {
 			local tcb = ildb.get_tcb(tcbpos)
 			if not tcb then return true end
 			for connid=1,2 do
-				if tcb[connid].ts_id or tcb[connid].signal then
-					minetest.chat_send_player(pname, attrans("Can't remove TCB: Both sides must have no track section and no signal assigned!"))
-					return false
-				end
-				if not ildb.may_modify_tcbs(tcb[connid]) then
-					minetest.chat_send_player(pname, attrans("Can't remove TCB: Side @1 forbids modification (shouldn't happen).", connid))
+				if tcb[connid].signal then
+					minetest.chat_send_player(pname, attrans("Can't remove TCB: Both sides must have no signal assigned!"))
 					return false
 				end
 			end
@@ -102,18 +102,11 @@ minetest.register_node("advtrains_interlocking:tcb_node", {
 	end,
 	after_dig_node = function(pos, oldnode, oldmetadata, player)
 		if not oldmetadata or not oldmetadata.fields then return end
+		local pname = player:get_player_name()
 		local tcbpts = oldmetadata.fields.tcb_pos
 		if tcbpts and tcbpts ~= "" then
 			local tcbpos = minetest.string_to_pos(tcbpts)
-			local success = ildb.remove_tcb(tcbpos)
-			if success and player then
-				minetest.chat_send_player(player:get_player_name(), attrans("TCB has been removed."))
-			else
-				minetest.chat_send_player(player:get_player_name(), attrans("Failed to remove TCB!"))
-				minetest.set_node(pos, oldnode)
-				local meta = minetest.get_meta(pos)
-				meta:set_string("tcb_pos", minetest.pos_to_string(tcbpos))
-			end
+			ildb.remove_tcb_at(tcbpos, pname)
 		end
 	end,
 })
@@ -165,23 +158,22 @@ minetest.register_on_punchnode(function(pos, node, player, pointed_thing)
 	local tcbnpos = players_assign_tcb[pname]
 	if tcbnpos then
 		if vector.distance(pos, tcbnpos)<=20 then
-			local node_ok, conns, rhe = advtrains.get_rail_info_at(pos, advtrains.all_tracktypes)
+			local node_ok, conns, rhe = advtrains.get_rail_info_at(pos)
 			if node_ok and #conns == 2 then
-				local ok = ildb.create_tcb(pos)
-				
-				if not ok then
-					minetest.chat_send_player(pname, attrans("Configuring TCB: TCB already exists at this position! It has now been re-assigned."))
+				-- if there is already a tcb here, reassign it
+				if ildb.get_tcb(pos) then
+					minetest.chat_send_player(pname, "Configuring TCB: Already existed at this position, it is now linked to this TCB marker")
+				else
+					ildb.create_tcb_at(pos, pname)
 				end
-				
-				ildb.sync_tcb_neighbors(pos, 1)
-				ildb.sync_tcb_neighbors(pos, 2)
-				
+
 				local meta = minetest.get_meta(tcbnpos)
 				meta:set_string("tcb_pos", minetest.pos_to_string(pos))
 				meta:set_string("infotext", attrans("TCB assigned to @1", minetest.pos_to_string(pos)))
 				minetest.chat_send_player(pname, attrans("Configuring TCB: Successfully configured TCB"))
+				advtrains.interlocking.show_tcb_marker(pos)
 			else
-				minetest.chat_send_player(pname, attrans("Configuring TCB: This is not a normal two-connection rail! Aborted."))
+				minetest.chat_send_player(pname, "Configuring TCB: This is not a normal two-connection rail! Aborted.")
 			end
 		else
 			minetest.chat_send_player(pname, attrans("Configuring TCB: Node is too far away. Aborted."))
@@ -196,18 +188,13 @@ minetest.register_on_punchnode(function(pos, node, player, pointed_thing)
 			local is_signal = minetest.get_item_group(node.name, "advtrains_signal") >= 2
 			if is_signal then
 				local ndef = minetest.registered_nodes[node.name]
-				if ndef and ndef.advtrains and ndef.advtrains.set_aspect then
+				if ndef and ndef.advtrains and ndef.advtrains.apply_aspect then
 					local tcbs = ildb.get_tcbs(sigd)
 					if tcbs then
-						tcbs.signal = pos
-						if not tcbs.signal_name then
-							tcbs.signal_name = minetest.pos_to_string(sigd.p)
-						end
-						if not tcbs.routes then
-							tcbs.routes = {}
-						end
-						ildb.set_sigd_for_signal(pos, sigd)
-						minetest.chat_send_player(pname, attrans("Configuring TCB: Successfully assigned signal."))
+						ildb.assign_signal_to_tcbs(pos, sigd)
+						-- use auto-naming
+						advtrains.interlocking.add_autoname_to_tcbs(tcbs, pname)
+						minetest.chat_send_player(pname, "Configuring TCB: Successfully assigned signal.")
 						advtrains.interlocking.show_ip_form(pos, pname, true)
 					else
 						minetest.chat_send_player(pname, attrans("Configuring TCB: Internal error, TCBS doesn't exist. Aborted."))
@@ -223,40 +210,201 @@ minetest.register_on_punchnode(function(pos, node, player, pointed_thing)
 		end
 		players_assign_signal[pname] = nil
 	end
+	
+	-- FixedLocks assignment
+	local ts_id = players_assign_fixedlocks[pname]
+	if ts_id then
+		if advtrains.is_passive(pos) then
+			local pts = advtrains.encode_pos(pos)
+			local state = advtrains.getstate(pos)
+			local ts = ildb.get_ts(ts_id)
+			if ts and ts.fixed_locks then
+				minetest.chat_send_player(pname, minetest.pos_to_string(pos).." locks in state "..state)
+				ts.fixed_locks[pts] = state
+			else
+				minetest.chat_send_player(pname, "Error: TS modified, abort!")
+				players_assign_fixedlocks[pname] = nil
+			end
+		else
+			minetest.chat_send_player(pname, "Setting fixed locks finished!")
+			players_assign_fixedlocks[pname] = nil
+			ildb.update_rs_cache(ts_id)
+			advtrains.interlocking.show_ts_form(ts_id, pname)
+		end
+	end
 end)
 
+-- "Self-contained TCB"
+-- 2024-11-25: Buffers should become their own TCB (and signal) automatically to permit setting routes to them
+-- These are support functions for this kind of node.
+
+-- Create an after_place_node callback for a self-contained TCB node. The parameters control additional behavior:
+-- fail_silently_on_noprivs: (boolean) Does not give an error in case the placer does not have the interlocking privilege
+-- auto_create_self_signal: (boolean) Automatically assign this same node as signal to the A side of the newly-created TCB
+--                          (this is useful for buffers as they serve both as TCB and as an always-halt signal)
+function advtrains.interlocking.self_tcb_make_after_place_callback(fail_silently_on_noprivs, auto_create_self_signal)
+	return function(pos, player, itemstack, pointed_thing)
+		local pname = player:get_player_name()
+		if not minetest.check_player_privs(pname, "interlocking") then
+			if not fail_silently_on_noprivs then
+				minetest.chat_send_player(pname, "Insufficient privileges to use this!")
+			end
+			return
+		end
+		if ildb.get_tcb(pos) then
+			minetest.chat_send_player(pname, "TCB already existed at this position, now linked to this node")
+		else
+			ildb.create_tcb_at(pos, pname)
+		end
+		if auto_create_self_signal then
+			local sigd = { p = pos, s = 1 }
+			local tcbs = ildb.get_tcbs(sigd)
+			-- make sure signal doesn't already exist
+			if tcbs.signal then
+				minetest.chat_send_player(pname, "Signal on B side already assigned!")
+				return
+			end
+			ildb.assign_signal_to_tcbs(pos, sigd)
+			-- assign influence point to itself
+			ildb.set_ip_signal(advtrains.roundfloorpts(pos), 1, pos)
+			-- use auto-naming
+			advtrains.interlocking.add_autoname_to_tcbs(tcbs, pname)
+		end
+	end
+end
+
+-- Create an can_dig callback for a self-contained TCB node. The parameters control additional behavior:
+-- is_signal: (boolean) Whether this node is also a signal (in addition to being a TCB), e.g. when auto_create_self_signal was set.
+--            Causes also the signal API's can_dig to be called
+function advtrains.interlocking.self_tcb_make_can_dig_callback(is_signal)
+	return function(pos, player)
+		local pname = player and player:get_player_name() or ""
+		-- need to duplicate logic of the regular "can_dig_or_modify_track()" function in core/tracks.lua
+		if advtrains.get_train_at_pos(pos) then
+			minetest.chat_send_player(pname, "Can't remove track, a train is here!")
+			return false
+		end
+		-- end of standard checks
+		local tcb = ildb.get_tcb(pos)
+		if not tcb then
+			-- digging always allowed because the TCB hasn't been created (unless signal callback interjects)
+			if is_signal then
+				return advtrains.interlocking.signal.can_dig(pos, player)
+			else
+				return true
+			end
+		end
+		-- TCB exists
+		if not minetest.check_player_privs(pname, "interlocking") then
+			return false
+		end
+		-- fine to remove (unless signal callback interjects)
+		if is_signal then
+			return advtrains.interlocking.signal.can_dig(pos, player)
+		else
+			return true
+		end
+	end
+end
+
+-- Create an after_dig_node callback for a self-contained TCB node. The parameters control additional behavior:
+-- is_signal: (boolean) Whether this node is also a signal (in addition to being a TCB), e.g. when auto_create_self_signal was set.
+--            Causes also the signal API's after_dig_node to be called
+function advtrains.interlocking.self_tcb_make_after_dig_callback(is_signal)
+	return function(pos, oldnode, oldmetadata, player)
+		local pname = player:get_player_name()
+		if is_signal then
+			-- "dig" the signal first
+			advtrains.interlocking.signal.after_dig(pos, oldnode, oldmetadata, player)
+		end
+		if ildb.get_tcb(pos) then
+			-- remove the TCB
+			ildb.remove_tcb_at(pos, pname, true)
+		end
+	end
+end
+
+-- Create an on_rightclick callback for a self-contained TCB node. The rightclick callback tries to repeat the TCB assignment
+-- if necessary and otherwise shows the TCB formspec. The parameters control additional behavior:
+-- fail_silently_on_noprivs: (boolean) Does not give an error in case the placer does not have the interlocking privilege
+-- auto_create_self_signal: (boolean) Automatically assign this same node as signal to the B side of the
+--                           newly-created TCB if that has not already happened during place.
+--                           Otherwise, opens the signal dialog instead of the TCB dialog on rightclick
+function advtrains.interlocking.self_tcb_make_on_rightclick_callback(fail_silently_on_noprivs, auto_create_self_signal)
+	return function(pos, node, player, itemstack, pointed_thing)
+		local pname = player:get_player_name()
+		if not minetest.check_player_privs(pname, "interlocking") then
+			if not fail_silently_on_noprivs then
+				minetest.chat_send_player(pname, "Insufficient privileges to use this!")
+			end
+			return
+		end
+		if ildb.get_tcb(pos) then
+			-- TCB already here. go on
+		else
+			-- otherwise create tcb
+			ildb.create_tcb_at(pos, pname)
+		end
+		if auto_create_self_signal then
+			local sigd = { p = pos, s = 1 }
+			local tcbs = ildb.get_tcbs(sigd)
+			-- make sure signal doesn't already exist
+			if not tcbs.signal then
+				-- go ahead and assign signal
+				ildb.assign_signal_to_tcbs(pos, sigd)
+				-- assign influence point to itself
+				ildb.set_ip_signal(advtrains.roundfloorpts(pos), 1, pos)
+				-- use auto-naming
+				advtrains.interlocking.add_autoname_to_tcbs(tcbs, pname)
+			end
+			-- in any case open the signalling form nouw
+			local control = player:get_player_control()
+			advtrains.interlocking.show_signal_form(pos, node, pname, control.aux1)
+			return
+		else
+			-- not an autosignal. Then show the TCB form
+			advtrains.interlocking.show_tcb_form(pos, pname)
+			return
+		end
+	end
+end
+
 -- TCB Form
 
 local sidecolorA = minetest.get_color_escape_sequence("#f40000")
 local sidecolorB = minetest.get_color_escape_sequence("#068b00")
 
-local function mktcbformspec(tcbs, btnpref, offset, pname)
+local function mktcbformspec(pos, side, tcbs, offset, pname)
 	local form = ""
+	local btnpref = side==1 and "A" or "B"
 	local ts
-	local sidecolor = sidecolorB
-	if btnpref == "A" then
-		sidecolor = sidecolorA
-	end
+	-- ensure that mapping and xlink are up to date
+	ildb.tcbs_ensure_ts_ref_exists({p=pos, s=side, tcbs=tcbs})
+	ildb.validate_tcb_xlink({p=pos, s=side, tcbs=tcbs})
+	-- Note: repair operations may have been triggered by this
 	if tcbs.ts_id then
 		ts = ildb.get_ts(tcbs.ts_id)
 	end
 	if ts then
-		form = form.."label[0.5,"..offset..";"..sidecolor..attrans("Side @1", btnpref)..": "..minetest.formspec_escape(ts.name).."]"
-		form = form.."button[0.5,"..(offset+0.5)..";5,1;"..btnpref.."_gotots;"..attrans("Show track section").."]"
-		if ildb.may_modify_tcbs(tcbs) then
-			-- Note: the security check to prohibit those actions is located in database.lua in the corresponding functions.
-			form = form.."button[0.5,"..(offset+1.5)..";2.5,1;"..btnpref.."_update;"..attrans("Update near TCBs").."]"
-			form = form.."button[3  ,"..(offset+1.5)..";2.5,1;"..btnpref.."_remove;"..attrans("Remove from section").."]"
-		end
+		form = form.."label[0.5,"..offset..";Side "..btnpref..": "..minetest.formspec_escape(ts.name or tcbs.ts_id).."]"
+		form = form.."button[0.5,"..(offset+0.5)..";5,1;"..btnpref.."_gotots;Show track section]"
 	else
 		tcbs.ts_id = nil
-		form = form.."label[0.5,"..offset..";"..sidecolor.."Strana "..btnpref..": "..attrans("End of interlocking").."]"
-		form = form.."button[0.5,"..(offset+0.5)..";5,1;"..btnpref.."_makeil;"..attrans("Create Interlocked Track Section").."]"
-		--if tcbs.section_free then
-			--form = form.."button[0.5,"..(offset+1.5)..";5,1;"..btnpref.."_setlocked;Section is free]"
-		--else
-			--form = form.."button[0.5,"..(offset+1.5)..";5,1;"..btnpref.."_setfree;Section is blocked]"		
-		--end
+		form = form.."label[0.5,"..offset..";Side "..btnpref..": ".."End of interlocking]"
+		form = form.."button[0.5,"..(offset+0.5)..";5,1;"..btnpref.."_makeil;Create Interlocked Track Section]"
+	end
+	-- xlink
+	if tcbs.xlink then
+		form = form.."label[0.5,"..(offset+1.5)..";Link:"..ildb.sigd_to_string(tcbs.xlink).."]"
+		form = form.."button[4.5,"..(offset+1.5)..";1,1;"..btnpref.."_xlinkdel;X]"
+	else
+		if players_assign_xlink[pname] then
+			form = form.."button[0.5,"..(offset+1.5)..";4,1;"..btnpref.."_xlinklink;Link "..ildb.sigd_to_string(players_assign_xlink[pname]).."]"
+			form = form.."button[4.5,"..(offset+1.5)..";1,1;"..btnpref.."_xlinkabrt;X]"
+		else
+			form = form.."label[0.5,"..(offset+1.5)..";No Link]"
+			form = form.."button[4.5,"..(offset+1.5)..";1,1;"..btnpref.."_xlinkadd;+]"
+		end
 	end
 	if tcbs.signal then
 		form = form.."button[0.5,"..(offset+2.5)..";5,1;"..btnpref.."_sigdia;"..attrans("Signalling").."]"	
@@ -276,8 +424,8 @@ function advtrains.interlocking.show_tcb_form(pos, pname)
 	if not tcb then return end
 	
 	local form = "size[6,9] label[0.5,0.5;"..attrans("Track Circuit Break Configuration").."]"
-	form = form .. mktcbformspec(tcb[1], "A", 1, pname)
-	form = form .. mktcbformspec(tcb[2], "B", 5, pname)
+	form = form .. mktcbformspec(pos, 1, tcb[1], 1, pname)
+	form = form .. mktcbformspec(pos, 2, tcb[2], 5, pname)
 	
 	minetest.show_formspec(pname, "at_il_tcbconfig_"..minetest.pos_to_string(pos), form)
 	advtrains.interlocking.show_tcb_marker(pos)
@@ -304,13 +452,13 @@ minetest.register_on_player_receive_fields(function(player, formname, fields)
 		local tcb = ildb.get_tcb(pos)
 		if not tcb then return end
 		local f_gotots = {fields.A_gotots, fields.B_gotots}
-		local f_update = {fields.A_update, fields.B_update}
-		local f_remove = {fields.A_remove, fields.B_remove}
 		local f_makeil = {fields.A_makeil, fields.B_makeil}
-		local f_setlocked = {fields.A_setlocked, fields.B_setlocked}
-		local f_setfree = {fields.A_setfree, fields.B_setfree}
 		local f_asnsig = {fields.A_asnsig, fields.B_asnsig}
 		local f_sigdia = {fields.A_sigdia, fields.B_sigdia}
+		local f_xlinkadd = {fields.A_xlinkadd, fields.B_xlinkadd}
+		local f_xlinkdel = {fields.A_xlinkdel, fields.B_xlinkdel}
+		local f_xlinklink = {fields.A_xlinklink, fields.B_xlinklink}
+		local f_xlinkabrt = {fields.A_xlinkabrt, fields.B_xlinkabrt}
 		
 		for connid=1,2 do
 			local tcbs = tcb[connid]
@@ -319,28 +467,33 @@ minetest.register_on_player_receive_fields(function(player, formname, fields)
 					advtrains.interlocking.show_ts_form(tcbs.ts_id, pname)
 					return
 				end
-				if f_update[connid] then
-					ildb.sync_tcb_neighbors(pos, connid)
-				end
-				if f_remove[connid] then
-					ildb.remove_from_interlocking({p=pos, s=connid})
-				end
 			else
 				if f_makeil[connid] then
-					-- try sinc_tcb_neighbors first
-					ildb.sync_tcb_neighbors(pos, connid)
-					-- if that didn't work, create new section
 					if not tcbs.ts_id then
-						ildb.create_ts({p=pos, s=connid})
-						ildb.sync_tcb_neighbors(pos, connid)
+						ildb.create_ts_from_tcbs({p=pos, s=connid})
 					end
 				end
-				-- non-interlocked
-				if f_setfree[connid] then
-					tcbs.section_free = true
+			end
+			if tcbs.xlink then
+				if f_xlinkdel[connid] then
+					ildb.remove_tcb_xlink({p=pos, s=connid})
 				end
-				if f_setlocked[connid] then
-					tcbs.section_free = nil
+			else
+				local osigd = players_assign_xlink[pname]
+				if osigd then
+					if f_xlinklink[connid] then
+						ildb.add_tcb_xlink({p=pos, s=connid}, osigd)
+						players_assign_xlink[pname] = nil
+					elseif f_xlinkabrt[connid] then
+						players_assign_xlink[pname] = nil
+					end
+				else
+					if f_xlinkadd[connid] then
+						players_assign_xlink[pname] = {p=pos, s=connid}
+						minetest.chat_send_player(pname, "TCB Link: Select linked TCB now!")
+						minetest.close_formspec(pname, formname)
+						return -- to not reopen form
+					end
 				end
 			end
 			if f_asnsig[connid] and not tcbs.signal then
@@ -364,10 +517,7 @@ end)
 
 -- TS Formspec
 
--- textlist selection temporary storage
-local ts_pselidx = {}
-
-function advtrains.interlocking.show_ts_form(ts_id, pname, sel_tcb)
+function advtrains.interlocking.show_ts_form(ts_id, pname)
 	if not minetest.check_player_privs(pname, "interlocking") then
 		minetest.chat_send_player(pname, attrans("Insufficient privileges to use this!"))
 		return
@@ -386,29 +536,27 @@ function advtrains.interlocking.show_ts_form(ts_id, pname, sel_tcb)
 		advtrains.interlocking.show_tcb_marker(sigd.p)
 	end
 	
-	form = form.."textlist[0.5,3;5,3;tcblist;"..table.concat(strtab, ",").."]"
+	form = form.."label[0.5,2.5;Boundary TCBs:]"
+	form = form.."textlist[0.5,3;4,3;tcblist;"..table.concat(strtab, ",").."]"
+	
+	-- additional route locks (e.g. for level crossings)
+	
+	strtab = {}
+	if ts.fixed_locks then
+		for pts, state in pairs(ts.fixed_locks) do
+			strtab[#strtab+1] = minetest.formspec_escape(
+				minetest.pos_to_string(advtrains.decode_pos(pts)).." = "..state)
+		end
+	end
+	form = form.."label[5.5,2.5;Fixed route locks (e.g. level crossings):]"
+	form = form.."textlist[5.5,3;4,3;fixedlocks;"..table.concat(strtab, ",").."]"
 	
 	if ildb.may_modify_ts(ts) then
+		form = form.."button[5.5,6;2,1;flk_add;Add locks]"
+		form = form.."button[7.5,6;2,1;flk_clear;Clear locks]"
 		
-		if players_link_ts[pname] then
-			local other_id = players_link_ts[pname]
-			local other_ts = ildb.get_ts(other_id)
-			if other_ts then
-				if ildb.may_modify_ts(other_ts) then
-					form = form.."button[5.5,3;3.5,1;mklink;"..attrans("Join with @1", minetest.formspec_escape(other_ts.name)).."]"
-					form = form.."button[9  ,3;0.5,1;cancellink;X]"
-				end
-			end
-		else
-			form = form.."button[5.5,3;4,1;link;"..attrans("Join into other section").."]"
-			hint = 1
-		end
-		form = form.."button[5.5,4;4,1;dissolve;"..attrans("Dissolve Section").."]"
-		form = form.."tooltip[dissolve;"..attrans("This will remove the track section and set all its end points to End Of Interlocking").."]"
-		if sel_tcb then
-			form = form.."button[5.5,5;4,1;del_tcb;"..attrans("Unlink selected TCB").."]"
-			hint = 2
-		end
+		form = form.."button[5.5,8;4,1;remove;Remove Section]"
+		form = form.."tooltip[remove;This will remove the track section and set all its end points to End Of Interlocking]"
 	else
 		hint=3
 	end
@@ -426,18 +574,13 @@ function advtrains.interlocking.show_ts_form(ts_id, pname, sel_tcb)
 		form = form.."label[0.5,7.1;"..attrans("No trains on this section.").."]"
 	end
 	
-	form = form.."button[5.5,7;4,1;reset;"..attrans("Reset section state").."]"
-	
-	if hint == 1 then
-		form = form.."label[0.5,0.75;"..attrans("Use the 'Join' button to designate rail crosses and link not listed far-away TCBs").."]"
-	elseif hint == 2 then
-		form = form.."label[0.5,0.75;"..attrans("Unlinking a TCB will set it to non-interlocked mode.").."]"
-	elseif hint == 3 then
-		form = form.."label[0.5,0.75;"..attrans("You cannot modify track sections when a route is set or a train is on the section.").."]"
+	form = form.."button[5.5,7;4,1;reset;Reset section state]"
+
+	if hint == 3 then
+		form = form.."label[0.5,0.75;You cannot modify track sections when a route is set or a train is on the section.]"
 		--form = form.."label[0.5,1;Trying to unlink a TCB directly connected to this track will not work.]"
 	end
 	
-	ts_pselidx[pname]=sel_tcb
 	minetest.show_formspec(pname, "at_il_tsconfig_"..ts_id, form)
 	
 end
@@ -449,45 +592,15 @@ minetest.register_on_player_receive_fields(function(player, formname, fields)
 		return
 	end
 	-- independent of the formspec, clear this whenever some formspec event happens
-	local tpsi = ts_pselidx[pname]
-	ts_pselidx[pname] = nil
 	
 	local ts_id = string.match(formname, "^at_il_tsconfig_(.+)$")
 	if ts_id and not fields.quit then
 		local ts = ildb.get_ts(ts_id)
 		if not ts then return end
 		
-		local sel_tcb
-		if fields.tcblist then
-			local tev = minetest.explode_textlist_event(fields.tcblist)
-			sel_tcb = tev.index
-			ts_pselidx[pname] = sel_tcb
-		elseif tpsi then
-			sel_tcb = tpsi
-		end
-		
 		if ildb.may_modify_ts(ts) then
-			if players_link_ts[pname] then
-				if fields.cancellink then
-					players_link_ts[pname] = nil
-				elseif fields.mklink then
-					ildb.link_track_sections(players_link_ts[pname], ts_id)
-					players_link_ts[pname] = nil
-				end
-			end
-			
-			if fields.del_tcb and sel_tcb and sel_tcb > 0 and sel_tcb <= #ts.tc_breaks then
-				if not ildb.remove_from_interlocking(ts.tc_breaks[sel_tcb]) then
-					minetest.chat_send_player(pname, attrans("Please unassign signal first!"))
-				end
-				sel_tcb = nil
-			end
-			
-			if fields.link then
-				players_link_ts[pname] = ts_id
-			end
-			if fields.dissolve then
-				ildb.dissolve_ts(ts_id)
+			if fields.remove then
+				ildb.remove_ts(ts_id)
 				minetest.close_formspec(pname, formname)
 				return
 			end
@@ -496,10 +609,22 @@ minetest.register_on_player_receive_fields(function(player, formname, fields)
 		if fields.setname then
 			ts.name = fields.name
 			if ts.name == "" then
-				ts.name = ts_id
+				ts.name = nil
 			end
 		end
 		
+		if fields.flk_add then
+			if not ts.fixed_locks then
+				ts.fixed_locks = {}
+			end
+			players_assign_fixedlocks[pname] = ts_id
+			minetest.chat_send_player(pname, "Punch components to add fixed locks. (punch anything else = end)")
+			minetest.close_formspec(pname, formname)
+			return
+		elseif fields.flk_clear then
+			ts.fixed_locks = nil
+		end
+		
 		if fields.reset then
 			-- User requested resetting the section
 			-- Show him what this means...
@@ -527,7 +652,7 @@ minetest.register_on_player_receive_fields(function(player, formname, fields)
 		ts.route = nil
 		for _, sigd in ipairs(ts.tc_breaks) do
 			local tcbs = ildb.get_tcbs(sigd)
-			advtrains.interlocking.update_signal_aspect(tcbs)
+			advtrains.interlocking.signal.update_route_aspect(tcbs)
 		end
 		minetest.chat_send_player(pname, attrans("Reset track section @1!", ts_id))
 	end
@@ -559,6 +684,13 @@ minetest.register_entity("advtrains_interlocking:tcbmarker", {
 	on_activate = function(self, sdata) if sdata=="STATIC" then self.object:remove() end end,
 })
 
+function advtrains.interlocking.remove_tcb_marker_pts(pts)
+	if markerent[pts] then
+		markerent[pts]:remove()
+		markerent[pts] = nil
+	end
+end
+
 function advtrains.interlocking.show_tcb_marker(pos)
 	--atdebug("showing tcb marker",pos)
 	local tcb = ildb.get_tcb(pos)
@@ -575,16 +707,14 @@ function advtrains.interlocking.show_tcb_marker(pos)
 			ts = ildb.get_ts(tcbs.ts_id)
 		end
 		if ts then
-			itex[connid] = ts.name
+			itex[connid] = ts.name or tcbs.ts_id or "???"
 		else
 			itex[connid] = "--EOI--"
 		end
 	end
 	
 	local pts = advtrains.roundfloorpts(pos)
-	if markerent[pts] then
-		markerent[pts]:remove()
-	end
+	advtrains.interlocking.remove_tcb_marker_pts(pts)
 	
 	local obj = minetest.add_entity(pos, "advtrains_interlocking:tcbmarker")
 	if not obj then return end
@@ -598,6 +728,88 @@ function advtrains.interlocking.show_tcb_marker(pos)
 	markerent[pts] = obj
 end
 
+function advtrains.interlocking.remove_tcb_marker(pos)
+	local pts = advtrains.roundfloorpts(pos)
+	if markerent[pts] then
+		markerent[pts]:remove()
+	end
+	markerent[pts] = nil
+end
+
+local ts_showparticles_callback = function(pos, connid, bconnid)
+	minetest.add_particle({
+		pos = pos,
+		velocity = {x=0, y=0, z=0},
+		acceleration = {x=0, y=0, z=0},
+		expirationtime = 10,
+		size = 7,
+		vertical = true,
+		texture = "at_il_ts_highlight_particle.png",
+		glow = 6,
+	})
+end
+
+-- Spawns particles to highlight the clicked track section
+-- TODO: Adapt behavior to not dumb-walk anymore
+function advtrains.interlocking.highlight_track_section(pos)
+	local all_tcbs = ildb.get_all_tcbs_adjacent(pos, nil, ts_showparticles_callback)
+	for _,sigd in ipairs(all_tcbs) do
+		advtrains.interlocking.show_tcb_marker(sigd.p)
+	end
+end
+
+-- checks that the given route is still valid (i.e. all its TCBs, sections and locks exist)
+-- returns true (ok) or false, reason (on issue)
+function advtrains.interlocking.check_route_valid(route, sigd)
+	-- this code is partially copy-pasted from routesetting.lua
+	-- we start at the tc designated by signal
+	local c_sigd = sigd
+	local i = 1
+	local c_tcbs, c_ts_id, c_ts, c_rseg
+	while c_sigd and i<=#route do
+		c_tcbs = ildb.get_tcbs(c_sigd)
+		if not c_tcbs then
+			return false, "No TCBS at "..sigd_to_string(c_sigd)
+		end
+		c_ts_id = c_tcbs.ts_id
+		if not c_ts_id then
+			return false, "No track section adjacent to "..sigd_to_string(c_sigd)
+		end
+		c_ts = ildb.get_ts(c_ts_id)
+		
+		c_rseg = route[i]
+		
+		if c_rseg.locks then
+			for pts, state in pairs(c_rseg.locks) do
+				local pos = advtrains.decode_pos(pts)
+				if not advtrains.is_passive(pos) then
+					return false, "No passive component for lock at "..pts
+				end
+			end
+		end
+		-- sanity check, is section at next the same as the current?
+		local nvar = c_rseg.next
+		if nvar then
+			local re_tcbs = ildb.get_tcbs({p = nvar.p, s = (nvar.s==1) and 2 or 1})
+			if not re_tcbs or not re_tcbs.ts_id or re_tcbs.ts_id~=c_ts_id then
+				return false, "TCB at "..minetest.pos_to_string(nvar.p).." has different section than previous TCB."
+			end
+		end
+		-- advance
+		c_sigd = nvar
+		i = i + 1
+	end
+	-- check end TCB
+	if not c_sigd then
+		return false, "Final TCBS unset (legacy-style buffer route)"
+	end
+	c_tcbs = ildb.get_tcbs(c_sigd)
+	if not c_tcbs then
+		return false, "Final TCBS missing at "..sigd_to_string(c_sigd)
+	end
+	return true, nil, c_sigd
+end
+
 -- Signalling formspec - set routes a.s.o
 
 -- textlist selection temporary storage
@@ -614,7 +826,6 @@ function advtrains.interlocking.show_signalling_form(sigd, pname, sel_rte, calle
 	local tcbs = ildb.get_tcbs(sigd)
 	
 	if not tcbs.signal then return end
-	if not tcbs.signal_name then tcbs.signal_name = "Signal at "..minetest.pos_to_string(sigd.p) end
 	if not tcbs.routes then tcbs.routes = {} end
 	
 	local form = "size[7,10]label[0.5,0.5;"..attrans("Signal at @1", minetest.pos_to_string(sigd.p)).."]"
@@ -649,42 +860,76 @@ function advtrains.interlocking.show_signalling_form(sigd, pname, sel_rte, calle
 		form = form.."button[0.5,6;  5,1;cancelroute;"..attrans("Cancel Route").."]"
 	else
 		if not tcbs.route_origin then
-			local strtab = {}
-			for idx, route in ipairs(tcbs.routes) do
-				local clr = ""
-				if route.ars then
-					clr = "#FF5555"
-					if route.ars.default then
-						clr = "#55FF55"
+			if #tcbs.routes > 0 then
+				-- at least one route is defined, show normal dialog
+				local strtab = {}
+				for idx, route in ipairs(tcbs.routes) do
+					local rname = route.name
+					local valid = atil.check_route_valid(route, sigd)
+					local clr = ""
+					if not valid then
+						clr = "#FF5555"
+						rname = rname.." (invalid)"
+					elseif route.ars then
+						clr = "#FFFF55"
+						if route.ars.default then
+							clr = "#55FF55"
+						end
+					end
+					strtab[#strtab+1] = clr .. minetest.formspec_escape(rname)
+				end
+				form = form.."label[0.5,2.5;Routes:]"
+				form = form.."textlist[0.5,3;5,3;rtelist;"..table.concat(strtab, ",")
+				if sel_rte then
+					form = form .. ";" .. sel_rte .."]"
+					form = form.."button[0.5,6;  5,1;setroute;Set Route]"
+					form = form.."button[0.5,7;2,1;dsproute;Show]"
+					if hasprivs then
+						form = form.."button[5.5,3.3;1,0.3;setarsdefault;D]tooltip[setarsdefault;Set ARS default route]"
+						form = form.."button[3.5,7;2,1;editroute;Edit]"
+						if sel_rte > 1 then
+							form = form .. "button[5.5,4;1,0.3;moveup;↑]"
+						end
+						if sel_rte < #strtab then
+							form = form .. "button[5.5,4.7;1,0.3;movedown;↓]"
+						end
+						form = form.."button[5.5,5.4;1,0.3;delroute;X]tooltip[delroute;Delete this route]"
+					end
+				else
+					form = form .. "]"
+					if tcbs.ars_disabled then
+						form = form.."label[0.5,6  ;NOTE: ARS is disabled.]"
+						form = form.."label[0.5,6.5;Routes are not automatically set.]"
 					end
 				end
-				strtab[#strtab+1] = clr .. minetest.formspec_escape(route.name)
-			end
-			form = form.."label[0.5,2.5;"..attrans("Routes:").."]"
-			form = form.."textlist[0.5,3;5,3;rtelist;"..table.concat(strtab, ",").."]"
-			if sel_rte then
-				form = form.."button[0.5,6;5,1;setroute;"..attrans("Set Route").."]"
-				form = form.."button[0.5,7;2,1;dsproute;"..attrans("Show").."]"
 				if hasprivs then
-					form = form.."button[3.5,7;2,1;editroute;"..attrans("Edit").."]"
-					-- form = form.."button[5.75,3;1,1;routeup;^]"
+					form = form.."button[0.5,8;2.5,1;smartroute;Smart Route]"
+					form = form.."button[  3,8;2.5,1;newroute;New (Manual)]"
+					form = form..string.format("checkbox[0.5,8.75;ars;Automatic routesetting;%s]", not tcbs.ars_disabled)
+					form = form..string.format("checkbox[0.5,9.25;dstarstrig;Distant signal triggers ARS;%s]", not tcbs.no_dst_ars_trig)
 				end
 			else
-				if tcbs.ars_disabled then
-					form = form.."label[0.5,6  ;"..attrans("NOTE: ARS is disabled.").."]"
-					form = form.."label[0.5,6.5;"..attrans("Routes are not automatically set.").."]"
+				-- no route is active, and no route is so far defined
+				if not tcbs.signal then atwarn("signalling form missing signal?!", pos) return end -- safeguard, nothing else in this function checks tcbs.signal
+				local caps = advtrains.interlocking.signal.get_signal_cap_level(tcbs.signal)
+				if caps >= 4 then
+					-- offer user the "block signal mode"
+					form = form.."label[0.5,2.5;No routes are yet defined.]"
+					if hasprivs then
+						form = form.."button[0.5,4;2.5,1;smartroute;Smart Route]"
+						form = form.."button[  3,4;2.5,1;newroute;New (Manual)]"
+					end
+				elseif caps >= 3 then
+					-- it's a buffer!
+					form = form.."label[0.5,2.5;This is an always-halt signal (e.g. a buffer)\n"
+								.."No routes can be set from here.]"
+				else
+					-- signal caps say it cannot be route start/end
+					form = form.."label[0.5,2.5;This is a pure distant signal\n"
+								.."No route is currently set through.]"
 				end
 			end
-			if hasprivs then
-				form = form.."button[0.5,8;2.5,1;newroute;"..attrans("New Route").."]"
-				form = form.."button[  3,8;2.5,1;unassign;"..attrans("Unassign Signal").."]"
-				form = form.."button[  3,9;2.5,1;influp;"..attrans("Influence Point").."]"
-			end
-			if tcbs.ars_disabled then
-				form = form.."button[0.5,9;2.5,1;arsenable;"..attrans("Enable ARS").."]"
-			else
-				form = form.."button[0.5,9;2.5,1;arsdisable;"..attrans("Disable ARS").."]"
-			end
+			
 		elseif sigd_equal(tcbs.route_origin, sigd) then
 			-- something has gone wrong: tcbs.routeset should have been set...
 			form = form.."label[0.5,2.5;"..attrans("Inconsistent state: route_origin is same TCBS but no route set. Try again.").."]"
@@ -701,14 +946,14 @@ function advtrains.interlocking.show_signalling_form(sigd, pname, sel_rte, calle
 	-- always a good idea to update the signal aspect
 	if not called_from_form_update then
 	-- FIX prevent a callback loop
-		advtrains.interlocking.update_signal_aspect(tcbs)
+		advtrains.interlocking.signal.update_route_aspect(tcbs)
 	end
 end
 
 function advtrains.interlocking.update_player_forms(sigd)
 	for pname, tsigd in pairs(p_open_sig_form) do
 		if advtrains.interlocking.sigd_equal(sigd, tsigd) then
-			advtrains.interlocking.show_signalling_form(sigd, pname, nil)
+			advtrains.interlocking.show_signalling_form(sigd, pname, nil, true)
 		end
 	end
 end
@@ -721,10 +966,7 @@ minetest.register_on_player_receive_fields(function(player, formname, fields)
 	end
 	local hasprivs = minetest.check_player_privs(pname, "interlocking")
 	
-	-- independent of the formspec, clear this whenever some formspec event happens
 	local tpsi = sig_pselidx[pname]
-	sig_pselidx[pname] = nil
-	p_open_sig_form[pname] = nil
 	
 	local pts, connids = string.match(formname, "^at_il_signalling_([^_]+)_(%d)$")
 	local pos, connid
@@ -739,6 +981,8 @@ minetest.register_on_player_receive_fields(function(player, formname, fields)
 		if not tcbs then return end
 
 		if fields.quit then
+			sig_pselidx[pname] = nil
+			p_open_sig_form[pname] = nil
 			-- form quit: disable temporary ARS ignore
 			tcbs.ars_ignore_next = nil
 			return
@@ -747,12 +991,18 @@ minetest.register_on_player_receive_fields(function(player, formname, fields)
 		local sel_rte
 		if fields.rtelist then
 			local tev = minetest.explode_textlist_event(fields.rtelist)
-			sel_rte = tev.index
+			if tev.type ~= "INV" then
+				sel_rte = tev.index
+			end
 		elseif tpsi then
 			sel_rte = tpsi
 		end
 		if fields.setname and fields.name and hasprivs then
-			tcbs.signal_name = fields.name
+			if fields.name == "" then
+				tcbs.signal_name = nil -- do not save a signal name if it isnt used (equivalent to track sections)
+			else
+				tcbs.signal_name = fields.name
+			end
 		end
 		if tcbs.routeset and fields.cancelroute then
 			if tcbs.routes[tcbs.routeset] and tcbs.routes[tcbs.routeset].ars then
@@ -768,6 +1018,11 @@ minetest.register_on_player_receive_fields(function(player, formname, fields)
 				tcbs.ars_ignore_next = nil
 				return
 			end
+			if fields.smartroute and hasprivs then
+				advtrains.interlocking.smartroute.start(pname, sigd)
+				tcbs.ars_ignore_next = nil
+				return
+			end
 			if sel_rte and tcbs.routes[sel_rte] then
 				if fields.setroute then
 					ilrs.update_route(sigd, tcbs, sel_rte)
@@ -779,41 +1034,45 @@ minetest.register_on_player_receive_fields(function(player, formname, fields)
 				end
 				if fields.editroute and hasprivs then
 					advtrains.interlocking.show_route_edit_form(pname, sigd, sel_rte)
-					--local rte = tcbs.routes[sel_rte]
-					--minetest.show_formspec(pname, formname.."_renroute_"..sel_rte, "field[name;Enter new route name;"..rte.name.."]")
 					return
 				end
+				if fields.setarsdefault and hasprivs then
+					for rid, route in ipairs(tcbs.routes) do
+						local isdefault = rid == sel_rte
+						if route.ars then
+							if route.ars.default and isdefault then
+								-- D button pressed but route was already default - remove ars default field!
+								route.ars.default = nil
+							elseif isdefault then
+								route.ars.default = true
+							else
+								route.ars.default = nil
+							end
+							-- if the table is nouw empty delete it
+							if not next(route.ars) then
+								route.ars = nil
+							end
+						elseif isdefault then
+							route.ars = {default = true}
+						end
+					end
+				end
+				if fields.delroute and hasprivs then
+					if tcbs.routes[sel_rte] and tcbs.routes[sel_rte].ars then
+						minetest.chat_send_player(pname, "Cannot delete route which has ARS rules, please review and then delete through edit dialog!")
+					else
+						table.remove(tcbs.routes,sel_rte)
+					end
+				end
 			end
 		end
 		
-		if fields.unassign and hasprivs then
-			-- unassigning the signal from the tcbs
-			-- only when no route is set.
-			-- Routes and name remain saved, in case the player wants to reassign a new signal
-			if not tcbs.routeset then
-				local signal_pos = tcbs.signal
-				ildb.set_sigd_for_signal(signal_pos, nil)
-				tcbs.signal = nil
-				tcbs.aspect = nil
-				minetest.close_formspec(pname, formname)
-				minetest.chat_send_player(pname, attrans("Signal has been unassigned. Name and routes are kept for reuse."))
-				return
-			else
-				minetest.chat_send_player(pname, attrans("Please cancel route first!"))
-			end
-		end
-		if fields.influp and hasprivs then
-			advtrains.interlocking.show_ip_form(tcbs.signal, pname)
-			return
+		if fields.ars then
+			tcbs.ars_disabled = not minetest.is_yes(fields.ars)
 		end
 		
-		if tcbs.ars_disabled and fields.arsenable then
-			core.log("action", pname.." turn ARS on at "..pts)
-			tcbs.ars_disabled = nil
-		end
-		if not tcbs.ars_disabled and fields.arsdisable then
-			core.log("action", pname.." turn ARS off at "..pts)
-			tcbs.ars_disabled = true
+		if fields.dstarstrig then
+			tcbs.no_dst_ars_trig = not minetest.is_yes(fields.dstarstrig)
 		end
 		
 		if fields.auto then
@@ -822,28 +1081,22 @@ minetest.register_on_player_receive_fields(function(player, formname, fields)
 		if fields.noauto then
 			tcbs.route_auto = false
 		end
+
+		if sel_rte and tcbs.routes[sel_rte]and not tcbs.routeset then
+			if fields.moveup then
+				if tcbs.routes[sel_rte - 1] then
+					tcbs.routes[sel_rte - 1], tcbs.routes[sel_rte] = tcbs.routes[sel_rte], tcbs.routes[sel_rte - 1]
+					sel_rte = sel_rte - 1
+				end
+			elseif fields.movedown then
+				if tcbs.routes[sel_rte + 1] then
+					tcbs.routes[sel_rte + 1], tcbs.routes[sel_rte] = tcbs.routes[sel_rte], tcbs.routes[sel_rte + 1]
+					sel_rte = sel_rte + 1
+				end
+			end
+		end
 		
 		advtrains.interlocking.show_signalling_form(sigd, pname, sel_rte, true)
 		return
 	end
-	
-	
-	if not hasprivs then return end
-	-- rename route
-	local rind, rte_id
-	pts, connids, rind = string.match(formname, "^at_il_signalling_([^_]+)_(%d)_renroute_(%d+)$")
-	if pts then
-		pos = minetest.string_to_pos(pts)
-		connid = tonumber(connids)
-		rte_id = tonumber(rind)
-		if not connid or connid<1 or connid>2 then return end
-	end
-	if pos and connid and rind and fields.name then
-		local sigd = {p=pos, s=connid}
-		local tcbs = ildb.get_tcbs(sigd)
-		if tcbs.routes[rte_id] then
-			tcbs.routes[rte_id].name = fields.name
-			advtrains.interlocking.show_signalling_form(sigd, pname)
-		end
-	end
 end)
diff --git a/advtrains_interlocking/textures/at_il_ts_highlight_particle.png b/advtrains_interlocking/textures/at_il_ts_highlight_particle.png
new file mode 100644
index 0000000..4ba3622
--- /dev/null
+++ b/advtrains_interlocking/textures/at_il_ts_highlight_particle.png
diff --git a/advtrains_interlocking/tool.lua b/advtrains_interlocking/tool.lua
index 82b295e..7ccab46 100644
--- a/advtrains_interlocking/tool.lua
+++ b/advtrains_interlocking/tool.lua
@@ -3,14 +3,78 @@
 
 local ilrs = advtrains.interlocking.route
 
+local function node_right_click(pos, pname, player)
+	if advtrains.is_passive(pos) then
+		local form = "size[7,5]label[0.5,0.5;Route lock inspector]"
+		local pts = advtrains.encode_pos(pos)
+		
+		local rtl = ilrs.has_route_lock(pts)
+		
+		if rtl then
+			form = form.."label[0.5,1;Route locks currently put:\n"..rtl.."]"
+			form = form.."button_exit[0.5,3.5;  5,1;clear;Clear]"
+		else
+			form = form.."label[0.5,1;No route locks set]"
+			form = form.."button_exit[0.5,3.5;  5,1;emplace;Emplace manual lock]"
+		end
+		
+		minetest.show_formspec(pname, "at_il_rtool_"..pts, form)
+		return
+	end
+
+	-- If not a turnout, check the track section and show a form
+	local node_ok, conns, rail_y=advtrains.get_rail_info_at(pos)
+	if not node_ok then
+		minetest.chat_send_player(pname, "Node is not a track!")
+		return
+	end
+	if advtrains.interlocking.db.get_tcb(pos) then
+		advtrains.interlocking.show_tcb_form(pos, pname)
+		return
+	end
+
+	local ts_id = advtrains.interlocking.db.check_and_repair_ts_at_pos(pos, nil, pname)
+	if ts_id then
+		advtrains.interlocking.show_ts_form(ts_id, pname)
+	else
+		minetest.chat_send_player(pname, "No track section at this location!")
+	end
+end
+
+local function node_left_click(pos, pname, player)
+	local node_ok, conns, rail_y=advtrains.get_rail_info_at(pos)
+	if not node_ok then
+		minetest.chat_send_player(pname, "Node is not a track!")
+		return
+	end
+
+	if advtrains.interlocking.db.get_tcb(pos) then
+		advtrains.interlocking.show_tcb_marker(pos)
+		return
+	end
+	
+	-- create track section if aux1 button down
+	local pc = player:get_player_control()
+	local force_create = pc.aux1
+
+	local ts_id = advtrains.interlocking.db.check_and_repair_ts_at_pos(pos, nil, pname, force_create)
+	if ts_id then
+		advtrains.interlocking.db.update_rs_cache(ts_id)
+		advtrains.interlocking.highlight_track_section(pos)
+	else
+		minetest.chat_send_player(pname, "No track section at this location!")
+	end
+end
+
+
 minetest.register_craftitem("advtrains_interlocking:tool",{
-	description = attrans("Interlocking tool\nright-click turnouts to inspect route locks"),
+	description = "Interlocking tool\nPunch: Highlight track section\nPlace: check route locks/show track section info",
 	groups = {cracky=1}, -- key=name, value=rating; rating=1..3.
 	inventory_image = "at_il_tool.png",
 	wield_image = "at_il_tool.png",
 	stack_max = 1,
-	on_place = function(itemstack, placer, pointed_thing)
-		local pname = placer:get_player_name()
+	on_place = function(itemstack, player, pointed_thing)
+		local pname = player:get_player_name()
 		if not pname then
 			return
 		end
@@ -20,36 +84,23 @@ minetest.register_craftitem("advtrains_interlocking:tool",{
 		end
 		if pointed_thing.type=="node" then
 			local pos=pointed_thing.under
-			if advtrains.is_passive(pos) then
-				local form = "size[7,5]label[0.5,0.5;" .. attrans("Route lock inspector") .. "]"
-				local pts = minetest.pos_to_string(pos)
-				
-				local rtl = ilrs.has_route_lock(pts)
-				
-				if rtl then
-					form = form.."label[0.5,1;" .. attrans("Route locks currently put:") .. "\n"..rtl.."]"
-					form = form.."button_exit[0.5,3.5;  5,1;clear;" .. attrans("Clear") .. "]"
-				else
-					form = form.."label[0.5,1;" .. attrans("No route locks set") .. "]"
-					form = form.."button_exit[0.5,3.5;  5,1;emplace;" .. attrans("Emplace manual lock") .. "]"
-				end
-				
-				minetest.show_formspec(pname, "at_il_rtool_"..pts, form)
-			else
-				minetest.chat_send_player(pname, attrans("Cannot use this here."))
-				return
-			end
+			node_right_click(pos, pname, player)
 		end
 	end,
-})
-
-minetest.register_craft({
-	output = "advtrains_interlocking:tool",
-	recipe = {
-		{"default:diamond", "", ""},
-		{"ch_extras:lupa", "", ""},
-		{"default:steel_ingot", "", ""},
-	},
+	on_use = function(itemstack, player, pointed_thing)
+		local pname = player:get_player_name()
+		if not pname then
+			return
+		end
+		if not minetest.check_player_privs(pname, {interlocking=true}) then
+			minetest.chat_send_player(pname, "Insufficient privileges to use this!")
+			return
+		end
+		if pointed_thing.type=="node" then
+			local pos=pointed_thing.under
+			node_left_click(pos, pname, player)
+		end
+	end
 })
 
 minetest.register_on_player_receive_fields(function(player, formname, fields)
@@ -60,7 +111,7 @@ minetest.register_on_player_receive_fields(function(player, formname, fields)
 	local pos
 	local pts = string.match(formname, "^at_il_rtool_(.+)$")
 	if pts then
-		pos = minetest.string_to_pos(pts)
+		pos = advtrains.decode_pos(pts)
 	end
 	if pos then
 		if advtrains.is_passive(pos) then
diff --git a/advtrains_interlocking/train_sections.lua b/advtrains_interlocking/train_sections.lua
index 757f36a..a1ee87f 100644
--- a/advtrains_interlocking/train_sections.lua
+++ b/advtrains_interlocking/train_sections.lua
@@ -40,83 +40,99 @@ local function itkexist(tbl, ikey, com)
 	return false
 end
 
-local function itremove(tbl, com)
+local function itremove(tbl, com, once)
 	local i=1
 	while i <= #tbl do
 		if tbl[i] == com then
 			table.remove(tbl, i)
+			if once then return end
 		else
 			i = i + 1
 		end
 	end
 end
-local function itkremove(tbl, ikey, com)
+local function itkremove(tbl, ikey, com, once)
 	local i=1
 	while i <= #tbl do
 		if tbl[i][ikey] == com then
 			table.remove(tbl, i)
+			if once then return end
 		else
 			i = i + 1
 		end
 	end
 end
 
-local function setsection(tid, train, ts_id, ts, sigd)
+local function setsection(tid, train, ts_id, ts, sigd, only_if_not_exist)
 	-- train
 	if not train.il_sections then train.il_sections = {} end
-	if not itkexist(train.il_sections, "ts_id", ts_id) then
+	if only_if_not_exist then
+		-- called for the back connid on enter, only to ensure that section is blocked if train was so far not registered
+		if not itkexist(train.il_sections, "ts_id", ts_id) then
+			table.insert(train.il_sections, {ts_id = ts_id, origin = sigd})
+		end
+	else
+		-- insert always, this leads to duplicate entries if the train enters the same section a second time
 		table.insert(train.il_sections, {ts_id = ts_id, origin = sigd})
 	end
 	
 	-- ts
 	if not ts.trains then ts.trains = {} end
-	if not itexist(ts.trains, tid) then
+	if only_if_not_exist then
+		-- called for the back connid on enter, only to ensure that section is blocked if train was so far not registered
+		if not itexist(ts.trains, tid) then
+			table.insert(ts.trains, tid)
+		end
+	else
 		table.insert(ts.trains, tid)
 	end
 	
 	-- routes
-	local tcbs = advtrains.interlocking.db.get_tcbs(sigd)
+	local tcbs
+	if sigd then
+		tcbs = advtrains.interlocking.db.get_tcbs(sigd)
+	end
 	
 	-- route setting - clear route state
 	if ts.route then
 		--atdebug(tid,"enters",ts_id,"examining Routestate",ts.route)
-		if not sigd_equal(ts.route.entry, sigd) then
+		if sigd and not sigd_equal(ts.route.entry, sigd) then
 			-- Train entered not from the route. Locate origin and cancel route!
 			atwarn("Train",tid,"hit route",ts.route.rsn,"!")
 			advtrains.interlocking.route.cancel_route_from(ts.route.origin)
 			atwarn("Route was cancelled.")
 		else
-			-- train entered route regularily. Reset route and signal
-			tcbs.route_committed = nil
-			tcbs.route_comitted = nil -- TODO compatibility cleanup
-			tcbs.aspect = nil
-			tcbs.route_origin = nil
-			advtrains.interlocking.update_signal_aspect(tcbs)
-			if tcbs.signal and sigd_equal(ts.route.entry, ts.route.origin) then
-				if tcbs.route_auto and tcbs.routeset then
-					--atdebug("Resetting route (",ts.route.origin,")")
-					advtrains.interlocking.route.update_route(ts.route.origin, tcbs)
-				else
-					tcbs.routeset = nil
-				end
-			end
+			-- train entered route regularily.
 		end
 		ts.route = nil
 	end
-	if tcbs.signal then
+	if tcbs and tcbs.signal then
+		-- Reset route and signal
+		-- Note that the hit-route case is already handled by cancel_route_from
+		-- this code only handles signal at entering tcb and also triggers for non-route ts
+		tcbs.route_committed = nil
+		tcbs.route_aspect = nil
+		tcbs.route_remote = nil
+		tcbs.route_origin = nil
+		tcbs.route_rsn = nil
+		if not tcbs.route_auto then
+			tcbs.routeset = nil
+		end
+		advtrains.interlocking.signal.update_route_aspect(tcbs)
 		advtrains.interlocking.route.update_route(sigd, tcbs)
 	end
 end
 
-local function freesection(tid, train, ts_id, ts)
+local function freesection(tid, train, ts_id, ts, clear_all)
 	-- train
 	if not train.il_sections then train.il_sections = {} end
-	itkremove(train.il_sections, "ts_id", ts_id)
+	itkremove(train.il_sections, "ts_id", ts_id, not clear_all)
 	
 	-- ts
 	if not ts.trains then ts.trains = {} end
-	itremove(ts.trains, tid)
+	itremove(ts.trains, tid, not clear_all)
 	
+	-- route locks
 	if ts.route_post then
 		advtrains.interlocking.route.free_route_locks(ts_id, ts.route_post.locks)
 		if ts.route_post.next then
@@ -138,12 +154,18 @@ end
 -- This sets the section for both directions, to be failsafe
 advtrains.tnc_register_on_enter(function(pos, id, train, index)
 	local tcb = ildb.get_tcb(pos)
-	if tcb then
-		for connid=1,2 do
-			local ts = tcb[connid].ts_id and ildb.get_ts(tcb[connid].ts_id)
-			if ts then
-				setsection(id, train, tcb[connid].ts_id, ts, {p=pos, s=connid})
-			end
+	if tcb and train.path_cp[index] and train.path_cn[index] then
+		-- forward conn
+		local connid = train.path_cn[index]
+		local ts = tcb[connid] and tcb[connid].ts_id and ildb.get_ts(tcb[connid].ts_id)
+		if ts then
+			setsection(id, train, tcb[connid].ts_id, ts, {p=pos, s=connid})
+		end
+		-- backward conn (safety only)
+		connid = train.path_cp[index]
+		ts = tcb[connid] and tcb[connid].ts_id and ildb.get_ts(tcb[connid].ts_id)
+		if ts then
+			setsection(id, train, tcb[connid].ts_id, ts, {p=pos, s=connid}, true)
 		end
 	end
 end)
@@ -153,8 +175,9 @@ end)
 advtrains.tnc_register_on_leave(function(pos, id, train, index)
 	local tcb = ildb.get_tcb(pos)
 	if tcb and train.path_cp[index] then
+		-- backward conn
 		local connid = train.path_cp[index]
-		local ts = tcb[connid].ts_id and ildb.get_ts(tcb[connid].ts_id)
+		local ts = tcb[connid] and tcb[connid].ts_id and ildb.get_ts(tcb[connid].ts_id)
 		if ts then
 			freesection(id, train, tcb[connid].ts_id, ts)
 		end
@@ -167,13 +190,13 @@ advtrains.te_register_on_create(function(id, train)
 	-- let's see what track sections we find here
 	local index = atround(train.index)
 	local pos = advtrains.path_get(train, index)
-	local ts_id, origin = ildb.get_ts_at_pos(pos)
+	local ts_id = ildb.check_and_repair_ts_at_pos(pos, 1) -- passing connid 1 - that always exists
 	if ts_id then
 		local ts = ildb.get_ts(ts_id)
 		if ts then
-			setsection(id, train, ts_id, ts, origin)
+			setsection(id, train, ts_id, ts, nil, true)
 		else
-			atwarn("ILDB corruption: TCB",origin," has invalid TS reference")
+			atwarn("While placing train, TS didnt exist ",ts_id)
 		end
 		-- Make train a shunt move
 		train.is_shunt = true
diff --git a/advtrains_interlocking/tsr_rail.lua b/advtrains_interlocking/tsr_rail.lua
index 7ad6a7a..9fdc3d9 100644
--- a/advtrains_interlocking/tsr_rail.lua
+++ b/advtrains_interlocking/tsr_rail.lua
@@ -3,13 +3,15 @@
 -- Simple rail whose only purpose is to place a TSR on the position, as a temporary solution until the timetable system covers everything.
 -- This code resembles the code in lines/stoprail.lua
 
+local S = attrans
+
 local function updateform(pos)
 	local meta = minetest.get_meta(pos)
 	local pe = advtrains.encode_pos(pos)
 	local npr = advtrains.interlocking.npr_rails[pe] or 2
 	
-	meta:set_string("infotext", attrans("Point speed restriction") .. ": "..npr)
-	meta:set_string("formspec", "field[npr;"..attrans("Set point speed restriction:")..";"..npr.."]")
+	meta:set_string("infotext", S("Point speed restriction: @1",npr))
+	meta:set_string("formspec", "field[npr;"..S("Set point speed restriction:")..";"..npr.."]")
 end
 
 
@@ -25,11 +27,11 @@ local adefunc = function(def, preset, suffix, rotation)
 			on_receive_fields = function(pos, formname, fields, player)
 				local pname = player:get_player_name()
 				if not minetest.check_player_privs(pname, {interlocking=true}) then
-					minetest.chat_send_player(pname, attrans("Interlocking privilege required!"))
+					minetest.chat_send_player(pname, S("You are not allowed to configure this track without the @1 privilege.", "interlocking"))
 					return
 				end
 				if minetest.is_protected(pos, pname) then
-					minetest.chat_send_player(pname, attrans("This rail is protected!"))
+					minetest.chat_send_player(pname, S("You are not allowed to configure this track."))
 					minetest.record_protection_violation(pos, pname)
 					return
 				end
@@ -59,7 +61,7 @@ if minetest.get_modpath("advtrains_train_track") ~= nil then
 		models_prefix="advtrains_dtrack",
 		models_suffix=".b3d",
 		shared_texture="advtrains_dtrack_shared_npr.png",
-		description=attrans("Point Speed Restriction Rail"),
+		description=S("Point Speed Restriction Track"),
 		formats={},
 		get_additional_definiton = adefunc,
 	}, advtrains.trackpresets.t_30deg_straightonly)
diff --git a/advtrains_line_automation/init.lua b/advtrains_line_automation/init.lua
index a54fdfe..65631a9 100644
--- a/advtrains_line_automation/init.lua
+++ b/advtrains_line_automation/init.lua
@@ -1,5 +1,6 @@
 ch_base.open_mod(minetest.get_current_modname())
 -- Advtrains line automation system
+
 advtrains.lines = {
 	-- [station code] = {name=..., owner=...}
 	stations = {},
diff --git a/advtrains_signals_japan/.gitignore b/advtrains_signals_japan/.gitignore
new file mode 100644
index 0000000..0969b6b
--- /dev/null
+++ b/advtrains_signals_japan/.gitignore
@@ -0,0 +1 @@
+models/*
diff --git a/advtrains_signals_japan/init.lua b/advtrains_signals_japan/init.lua
new file mode 100644
index 0000000..1140b6b
--- /dev/null
+++ b/advtrains_signals_japan/init.lua
@@ -0,0 +1,461 @@
+local pole_texture = "advtrains_signals_japan_mast.png"
+local signal_face_texture = "advtrains_hud_bg.png^[colorize:#000000:255"
+local pole_radius = 1/16
+local pole_box = {-pole_radius,-1/2,-pole_radius,pole_radius,1/2,pole_radius}
+local light_radius = 1/20
+local signal_width = 6*light_radius
+local signal_thickness = pole_radius*3
+local signal_height = {}
+local signal_box = {}
+local light_red = "advtrains_hud_bg.png^[colorize:red:255"
+local light_yellow = "advtrains_hud_bg.png^[colorize:orange:255"
+local light_green = "advtrains_hud_bg.png^[colorize:lime:255"
+local light_purple = "advtrains_hud_bg.png^[colorize:purple:255"
+local light_distant = light_purple
+local light_off = signal_face_texture
+
+do
+	local model_path_prefix = table.concat({minetest.get_modpath("advtrains_signals_japan"), "models", "advtrains_signals_japan_"}, DIR_DELIM)
+
+	local function vertex(x, y, z)
+		return string.format("v %f %f %f", x, y, z)
+	end
+	local function texture(u, v)
+		return string.format("vt %f %f", u, v)
+	end
+	local function face_element(v, vt)
+		if vt then
+			return string.format("%d/%d", v, vt)
+		end
+		return tonumber(v)
+	end
+	local function face_elements(...)
+		local st = {"f"}
+		local args = {...}
+		local len = #args
+		for i = 1, len, 2 do
+			st[(i+3)/2] = face_element(args[i], args[i+1])
+		end
+		return table.concat(st, " ")
+	end
+	local function sequential_elements(v0, vt0, count)
+		local st = {}
+		for i = 1, count do
+			st[i] = face_element(v0+i, vt0+i)
+		end
+		return table.concat(st, " ")
+	end
+	local function mod_lower(min, a, b)
+		return min + (a-min)%b
+	end
+	local function connect_circular(v0, vt0, count)
+		return "f " .. sequential_elements(v0, vt0, count)
+	end
+	local function connect_cylindrical(v0, vt0, count)
+		local st = {}
+		for i = 0, count-1 do
+			local j = (i+1)%count
+			local v1 = v0+i+1
+			local v2 = v1+count
+			local v3 = v0+j+1
+			local v4 = v3+count
+			local vt1 = vt0+i+1
+			local vt2 = vt1+count+1
+			st[i+1] = face_elements(v1, vt1, v3, vt1+1, v4, vt2+1, v2, vt2)
+		end
+		return table.concat(st, "\n")
+	end
+	local function circular_textures(u0, v0, r, count, total, angular_offset, direction)
+		local st = {}
+		if not angular_offset then
+			angular_offset = 0
+		end
+		if not total then
+			total = count
+		end
+		if not direction then
+			direction = 1
+		end
+		for i = 0, count-1 do
+			local theta = angular_offset + direction*i/total*2*math.pi
+			local u, v = r*math.cos(theta), r*math.sin(theta)
+			st[i+1] = texture(u0+u, v0+v)
+		end
+		return table.concat(st, "\n")
+	end
+	local function rectangular_textures(u0, v0, u1, v1, count)
+		local st = {}
+		local width = u1-u0
+		for i = 0, count do
+			local u = u0+i/count*width
+			st[i+1] = texture(u, v0)
+			st[i+count+2] = texture(u, v1)
+		end
+		return table.concat(st, "\n")
+	end
+
+	-- generate pole model
+	local pole_npolygon = 32
+	local pole_vertex_count = pole_npolygon*2
+	local pole_uv_count = pole_npolygon*3+2
+	local pole_vertices = {}
+	local pole_objdef = {
+		"g pole",
+		"usemtl pole",
+		connect_circular(0, 0, pole_npolygon),
+		connect_circular(pole_npolygon, 0, pole_npolygon),
+		connect_cylindrical(0, pole_npolygon, pole_npolygon),
+	}
+	local pole_uv = {
+		circular_textures(0.5, 0.5, 0.5, pole_npolygon),
+		rectangular_textures(0, 0, 1, 1, pole_npolygon),
+	}
+	for i = 0, pole_npolygon-1 do
+		local theta = i*2/pole_npolygon*math.pi
+		local r = pole_radius
+		local x, z = r*math.sin(theta), r*math.cos(theta)
+		local lower_index = i+1
+		local upper_index = lower_index+pole_npolygon
+		pole_vertices[lower_index] = vertex(x, -0.5, z)
+		pole_vertices[upper_index] = vertex(x, 0.5, z)
+	end
+	pole_vertices = table.concat(pole_vertices, "\n")
+	pole_objdef = table.concat(pole_objdef, "\n")
+	pole_uv = table.concat(pole_uv, "\n")
+	minetest.safe_file_write(model_path_prefix .. "pole.obj", table.concat({pole_vertices, pole_uv, pole_objdef}, "\n"))
+
+	-- generate signals
+	for lightcount = 5, 6 do
+		for rotname, rot in pairs {["0"] = 0, ["30"] = 26.5, ["45"] = 45, ["60"] = 63.5} do
+			local rot = math.rad(rot)
+			local lightradius = 0.05
+			local lightspacing = 0.04
+			local halfwidth = signal_width/2
+			local halfheight = (2+lightcount)*lightradius+(lightcount-1)*lightspacing/2
+			local halfthickness = signal_thickness/2
+			local half_npolygon = pole_npolygon/2
+			local quarter_npolygon = pole_npolygon/4
+			local boxside = math.max(halfwidth, halfthickness*2)
+			signal_height[lightcount] = halfheight*2
+			signal_box[lightcount] = {-boxside, -halfheight, -boxside, boxside, halfheight, boxside}
+
+			local _vertex = vertex
+			local rv = vector.new(0, rot, 0)
+			local function vertex(x, y, z)
+				local v = vector.rotate(vector.new(x, y, z), rv)
+				return _vertex(v.x, v.y, v.z)
+			end
+
+			-- generate signal face
+			local face_vertices = {}
+			local face_uv = {
+				circular_textures(0.5, 0.5+halfheight-3*lightradius, halfwidth, half_npolygon+1, pole_npolygon),
+				circular_textures(0.5, 0.5-halfheight+3*lightradius, halfwidth, half_npolygon+1, pole_npolygon, math.pi),
+				rectangular_textures(0, 0, 1, 1, 2+pole_npolygon),
+			}
+			local face_objdef = {
+				"g face",
+				"usemtl face",
+				connect_circular(pole_vertex_count+2+pole_npolygon, pole_uv_count, 2+pole_npolygon),
+				connect_circular(pole_vertex_count, pole_uv_count, 2+pole_npolygon),
+				connect_cylindrical(pole_vertex_count, pole_uv_count+2+pole_npolygon, 2+pole_npolygon),
+			}
+			local face_vertex_count = 4*half_npolygon+4
+			local face_uv_count = 2*(half_npolygon+1) + 2*(pole_npolygon+3)
+			for i = 0, half_npolygon do
+				local theta = i/half_npolygon*math.pi
+				local r = halfwidth
+				local x, y = r*math.cos(theta), halfheight-3*lightradius+r*math.sin(theta)
+				face_vertices[i+1] = vertex(x, y, -halfthickness)
+				face_vertices[i+2+half_npolygon] = vertex(-x, -y, -halfthickness)
+				face_vertices[i+3+2*half_npolygon] = vertex(x, y, halfthickness)
+				face_vertices[i+4+3*half_npolygon] = vertex(-x, -y, halfthickness)
+			end
+
+			-- generate lights
+			local light_vertices = {}
+			local light_vertex_count = 8*(half_npolygon+1)+pole_npolygon
+			local light_uv = {rectangular_textures(0, 0, 1, 1, half_npolygon)}
+			local light_uv_count = 2*(half_npolygon+1)+pole_npolygon*lightcount
+			local light_objdef_face = {}
+			local light_objdef_main = {
+				"g light",
+				"usemtl light",
+			}
+			for i = 1, lightcount do
+				local x0, y0 = 0, -halfheight + (2*i+1)*lightradius + (i-1)*lightspacing
+				local v0 = light_vertex_count*(i-1)
+				for j = 0, half_npolygon do
+					local theta = j/half_npolygon*math.pi
+					local xs, ys = math.cos(theta), math.sin(theta)
+					for k, v in pairs {
+						{xm = -1, ym = 1, rm = 1, z = 1},
+						{xm = 1, ym = 1, rm = 0.8, z = 1},
+						{xm = -1, ym = 1, rm = 1, z = 2},
+						{xm = 1, ym = 1, rm = 0.8, z = 2},
+						{xm = 1, ym = -1, rm = 1, z = 1},
+						{xm = -1, ym = -1, rm = 0.8, z = 1},
+						{xm = 1, ym = -1, rm = 1, z = 1.5},
+						{xm = -1, ym = -1, rm = 0.8, z = 1.5},
+					} do
+						local x = x0+xs*lightradius*v.xm*v.rm
+						local y = y0+ys*lightradius*v.ym*v.rm
+						light_vertices[v0+(k-1)*(half_npolygon+1)+j+1] = vertex(x, y, -halfthickness*v.z)
+					end
+				end
+				for j = 0, pole_npolygon-1 do
+					local theta = j/pole_npolygon*2*math.pi
+					local x, y = math.cos(theta), math.sin(theta)
+					light_vertices[v0+8*(half_npolygon+1)+1+j] = vertex(x0+lightradius*x, y0+lightradius*y, -halfthickness*1.05)
+				end
+				local v0 = pole_vertex_count+face_vertex_count+v0
+				local vt0 = pole_uv_count + face_uv_count
+				local ostep = 2*half_npolygon+2
+				for j = 1, half_npolygon do
+					local dv = 2*(half_npolygon+1)
+					local v0 = v0 + dv
+					local vn = v0 + dv
+					light_objdef_face[i*ostep-j+1] = face_elements(v0+j, vt0+j, v0+j+1, vt0+j+1, vn-j, vt0+half_npolygon+2+j, vn-j+1, vt0+half_npolygon+1+j)
+					local v0 = vn + dv
+					local vn = v0 + dv
+					light_objdef_face[i*ostep-half_npolygon-j+1] = face_elements(v0+j, vt0+j, v0+j+1, vt0+j+1, vn-j, vt0+half_npolygon+2+j, vn-j+1, vt0+half_npolygon+1+j)
+				end
+				local vt0 = vt0 + 2*(half_npolygon+1) + (i-1)*pole_npolygon
+				light_uv[i+1] = circular_textures(0.5, (i-1/2)/lightcount, 0.4/lightcount, pole_npolygon)
+				light_objdef_face[(i-1)*ostep+1] = connect_cylindrical(v0, pole_uv_count+2+pole_npolygon, 2+pole_npolygon)
+				light_objdef_face[(i-1)*ostep+2] = connect_cylindrical(v0+4*(half_npolygon+1), pole_uv_count+2+pole_npolygon, 2+pole_npolygon)
+				light_objdef_main[2+i] = connect_circular(v0+8*(half_npolygon+1), vt0, pole_npolygon)
+			end
+
+			-- write file
+			face_vertices = table.concat(face_vertices, "\n")
+			face_uv = table.concat(face_uv, "\n")
+			face_objdef = table.concat(face_objdef, "\n")
+			minetest.safe_file_write(model_path_prefix .. lightcount .. "_" .. rotname .. ".obj", table.concat({
+				pole_vertices,
+				face_vertices,
+				table.concat(light_vertices, "\n"),
+				pole_uv,
+				face_uv,
+				table.concat(light_uv, "\n"),
+				pole_objdef,
+				face_objdef,
+				table.concat(light_objdef_face, "\n"),
+				table.concat(light_objdef_main, "\n"),
+			}, "\n"))
+		end
+	end
+end
+
+local S = attrans
+
+minetest.register_node("advtrains_signals_japan:pole_0", {
+	description = S("Japanese signal pole"),
+	drawtype = "mesh",
+	mesh = "advtrains_signals_japan_pole.obj",
+	tiles = {pole_texture},
+
+	paramtype = "light",
+	sunlight_propagates = true,
+
+	paramtype2 = "none",
+	selection_box = {
+		type = "fixed",
+		fixed = {pole_box},
+	},
+	collision_box = {
+		type = "fixed",
+		fixed = {pole_box},
+	},
+	groups = {
+		cracky = 2,
+		not_blocking_trains = 1,
+		not_in_creative_inventory = 0,
+	},
+	drop = "advtrains_signals_japan:pole_0",
+})
+
+--[[
+advtrains.interlocking.aspect.register_group {
+	name = "advtrains_signals_japan:5a",
+	label = S("Japanese signal"),
+	aspects = {
+		danger = {
+			label = S"Danger (halt)",
+			main = 0,
+		},
+		restrictedspeed = {
+			label = S"Restricted speed",
+		},
+		caution = {
+			label = S"Caution",
+		},
+		reducedspeed = {
+			label = S"Reduced speed",
+		},
+		clear = {
+			label = S"Clear (proceed)",
+		},
+		"clear",
+		"reducedspeed",
+		"caution",
+		"restrictedspeed",
+		"danger",
+	}
+}]]
+
+local sigdefs = {}
+local lightcolors = {
+	red = "red",
+	green = "lime",
+	yellow = "orange",
+	distant = "purple",
+}
+local function process_signal(name, sigdata, isrpt)
+	local def = {}
+	local tx = {}
+	def.textures = tx
+	def.desc = sigdata.desc
+	def.isdst = isrpt
+	def.aspects = sigdata.aspects
+	local lights = sigdata.lights
+	local lightcount = #lights
+	if isrpt then
+		lightcount = lightcount+1
+	end
+	def.lightcount = lightcount
+	def.suppasp_names = {}
+	for idx, asp in ipairs(sigdata.aspects) do
+		local aspname = asp.name
+		local tt = {
+			string.format("[combine:1x%d", lightcount),
+			string.format("0,0=(advtrains_hud_bg.png\\^[resize\\:1x%d\\^[colorize\\:#000)", lightcount),
+		}
+		for _, i in pairs(asp.lights) do
+			local color = lightcolors[lights[i]]
+			tt[#tt+1] = string.format("0,%d=(advtrains_hud_bg.png\\^[colorize\\:%s)", i-1, color)
+		end
+		if isrpt then
+			local color = lightcolors.distant
+			tt[#tt+1] = string.format("0,%d=(advtrains_hud_bg.png\\^[colorize\\:%s)", lightcount-1, color)
+		end
+		tx[aspname] = table.concat(tt, ":")
+		def.suppasp_names[idx] = aspname
+	end
+	local invimg = {
+		string.format("[combine:%dx%d", lightcount*4+1, lightcount*4+1),
+		string.format("%d,0=(advtrains_hud_bg.png\\^[resize\\:5x%d\\^[colorize\\:#000)", lightcount*2-2, lightcount*4+1),
+	}
+	for i, c in pairs(lights) do
+		local color = lightcolors[c]
+		invimg[i+2] = string.format("%d,%d=(advtrains_hud_bg.png\\^[resize\\:3x3\\^[colorize\\:%s)", 2*lightcount-1, 4*i-3, color)
+	end
+	if isrpt then
+		invimg[lightcount+2] = string.format("%d,%d=(advtrains_hud_bg.png\\^[resize\\:3x3\\^[colorize\\:%s)", 2*lightcount-1, 4*lightcount-3, lightcolors.distant)
+	end
+	def.inventory_image = table.concat(invimg, ":")
+	return def
+end
+for sigtype, sigdata in pairs {
+	["5a"] = {
+		desc = "5A",
+		lights = {"yellow", "yellow", "red", "yellow", "green"},
+		aspects = {
+			{name = "clear", description = S"Clear (proceed)", lights = {5}, main = -1},
+			{name = "reducedspeed", description = S"Reduced speed", lights = {2, 5}, main = 12},
+			{name = "caution", description = S"Caution", lights = {4}},
+			{name = "restrictedspeed", description = S"Restricted speed", lights = {1, 4}, main = 6},
+			{name = "danger", description = S"Danger (halt)", lights = {3}, main = 0},
+		}
+	}
+} do
+	sigdefs["main_"..sigtype] = process_signal(sigtype, sigdata)
+	-- TODO re-enable this once ready
+	--sigdefs["rpt_"..sigtype] = process_signal(sigtype, sigdata, true)
+end
+
+for _, rtab in ipairs {
+	{rot = "0", ici = true},
+	{rot = "30"},
+	{rot = "45"},
+	{rot = "60"},
+} do
+	local rot = rtab.rot
+	for sigtype, siginfo in pairs(sigdefs) do
+		local lightcount = siginfo.lightcount
+		for asp, texture in pairs(siginfo.textures) do
+			minetest.register_node("advtrains_signals_japan:"..sigtype.."_"..asp.."_"..rot, {
+				description = attrans(string.format("Japanese%s signal (type %s)", siginfo.isdst and " repeating" or "", siginfo.desc)),
+				drawtype = "mesh",
+				mesh = string.format("advtrains_signals_japan_%d_%s.obj", lightcount, rot),
+				tiles = {pole_texture, signal_face_texture, texture},
+				paramtype = "light",
+				sunlight_propagates = true,
+				light_source = 4,
+				paramtype2 = "facedir",
+				selection_box = {
+					type = "fixed",
+					fixed = {pole_box, signal_box[lightcount]},
+				},
+				collision_box = {
+					type = "fixed",
+					fixed = {pole_box, signal_box[lightcount]},
+				},
+				groups = {
+					cracky = 2,
+					advtrains_signal = 2,
+					not_blocking_trains = 1,
+					save_in_at_nodedb = 1,
+					not_in_creative_inventory = rtab.ici and asp == "danger" and 0 or 1,
+				},
+				inventory_image = siginfo.inventory_image,
+				drop = "advtrains_signals_japan:"..sigtype.."_danger_0",
+				advtrains = {
+					main_aspects = siginfo.aspects,
+					apply_aspect = function(pos, node, main_aspect, rem_aspect, rem_aspinfo)
+						local asp_name = main_aspect and main_aspect.name or "danger"
+						-- if this signal is clear and remote signal is restrictive (<= 10) then degrade to caution aspect
+						if not main_aspect or main_aspect.halt then
+							asp_name = "danger"
+						elseif main_aspect.name == "clear" and rem_aspinfo and rem_aspinfo.main and rem_aspinfo.main >= 0 and rem_aspinfo.main <= 10 then
+							asp_name = "caution"
+						end
+						advtrains.ndb.swap_node(pos, {name="advtrains_signals_japan:"..sigtype.."_"..asp_name.."_"..rot, param2 = node.param2})
+					end,
+					get_aspect_info = function(pos, main_aspect)
+						if main_aspect.halt then
+							return { main = 0 } -- generic halt
+						end
+						return {
+							main = main_aspect.main,
+							proceed_as_main = true,
+						}
+					end,
+					route_role = "main_distant",
+				--[[
+					supported_aspects = {
+						group = "advtrains_signals_japan:5a",
+						name = siginfo.suppasp_names,
+						dst_shift = siginfo.isdst and 0,
+						main = (not siginfo.isdst) and {} or false
+					},
+					get_aspect = function()
+						local main
+						if siginfo.isdst then
+							main = false
+						end
+						return {group = "advtrains_signals_japan:5a", name = asp, main = main}
+					end,
+					set_aspect = function(pos, node, asp)
+						advtrains.ndb.swap_node(pos, {name = "advtrains_signals_japan:"..sigtype.."_"..(asp.name).."_"..rot, param2 = node.param2})
+					end,
+				]]
+				},
+				on_rightclick = advtrains.interlocking.signal.on_rightclick,
+				can_dig = advtrains.interlocking.signal.can_dig,
+				after_dig_node = advtrains.interlocking.signal.after_dig,
+			})
+			--advtrains.trackplacer.add_worked("advtrains_signals_japan:"..sigtype, asp, "_"..rot)
+		end
+	end
+end
diff --git a/advtrains_signals_japan/mod.conf b/advtrains_signals_japan/mod.conf
new file mode 100644
index 0000000..8cb2cb3
--- /dev/null
+++ b/advtrains_signals_japan/mod.conf
@@ -0,0 +1,6 @@
+name=advtrains_signals_japan
+title=Advtrains Interlocking Signal Set - Japanese Signals
+description=Japanese signal set for the Advanced Trains Interlocking system
+author=yw05
+
+depends=advtrains_interlocking
diff --git a/advtrains_signals_japan/textures/advtrains_signals_japan_mast.png b/advtrains_signals_japan/textures/advtrains_signals_japan_mast.png
new file mode 100644
index 0000000..8d288a9
--- /dev/null
+++ b/advtrains_signals_japan/textures/advtrains_signals_japan_mast.png
diff --git a/advtrains_signals_ks/init.lua b/advtrains_signals_ks/init.lua
index d406bdc..9c59401 100644
--- a/advtrains_signals_ks/init.lua
+++ b/advtrains_signals_ks/init.lua
@@ -14,10 +14,9 @@ local function asp_to_zs3type(asp)
 	return math.min(16,4*math.floor(n/4))
 end
 
-local function setzs3(msp, lim, rot)
+local function setzs3(msp, asp, rot)
 	local pos = {x = msp.x, y = msp.y+1, z = msp.z}
 	local node = advtrains.ndb.get_node(pos)
-	local asp = asp_to_zs3type(lim)
 	if node.name:find("^advtrains_signals_ks:zs3_") then
 		advtrains.ndb.swap_node(pos, {name="advtrains_signals_ks:zs3_"..asp.."_"..rot, param2 = node.param2})
 	end
@@ -52,88 +51,147 @@ local function getzs3v(msp)
 	return speed
 end
 
-local setaspectf = function(rot)
- return function(pos, node, asp)
-	setzs3(pos, asp.main, rot)
-	if asp.main == 0 then
-		if asp.shunt then
-			advtrains.ndb.swap_node(pos, {name="advtrains_signals_ks:hs_shunt_"..rot, param2 = node.param2})
-		else
-			advtrains.ndb.swap_node(pos, {name="advtrains_signals_ks:hs_danger_"..rot, param2 = node.param2})
-		end
+local applyaspectf_main = function(rot)
+ return function(pos, node, main_aspect, dst_aspect, dst_aspect_info)
+	if main_aspect.halt then
+		-- halt aspect, set red and don't do anything further
+		advtrains.ndb.swap_node(pos, {name="advtrains_signals_ks:hs_danger_"..rot, param2 = node.param2})
+		setzs3(pos, "off", rot)
+		setzs3v(pos, nil, rot)
+		return
+	end
+	-- set zs3 signal to show speed according to main_aspect
+	setzs3(pos, main_aspect.zs3, rot)
+	-- select appropriate lamps based on mainaspect and dst
+	if main_aspect.shunt then
+		advtrains.ndb.swap_node(pos, {name="advtrains_signals_ks:hs_shunt_"..rot, param2 = node.param2})
 		setzs3v(pos, nil, rot)
 	else
-		if not asp.dst or asp.dst == -1 then
+		if not dst_aspect_info
+				or not dst_aspect_info.main
+				or dst_aspect_info.main == -1 then
 			advtrains.ndb.swap_node(pos, {name="advtrains_signals_ks:hs_free_"..rot, param2 = node.param2})
-		elseif asp.dst == 0 then
+			setzs3v(pos, nil, rot)
+		elseif dst_aspect_info.main == 0 then
 			advtrains.ndb.swap_node(pos, {name="advtrains_signals_ks:hs_slow_"..rot, param2 = node.param2})
+			setzs3v(pos, nil, rot)
 		else
 			advtrains.ndb.swap_node(pos, {name="advtrains_signals_ks:hs_nextslow_"..rot, param2 = node.param2})
+			setzs3v(pos, dst_aspect_info.main, rot)
 		end
-		setzs3v(pos, asp.dst, rot)
 	end
  end
 end
 
+-- Main aspects main signal
+-- These aspects tell only the speed signalization at this signal.
+-- Actual signal aspect is chosen based on this and the Dst signal.
+local mainaspects_main = {
+	{
+		name = "proceed",
+		description = "Proceed",
+		zs3 = "off"
+	},
+	{
+		name = "shunt",
+		description = "Shunt",
+		zs3 = "off",
+		shunt = true,
+	},
+	{
+		name = "proceed_16",
+		description = "Proceed (speed 16)",
+		zs3 = "16",
+	},
+	{
+		name = "proceed_12",
+		description = "Proceed (speed 12)",
+		zs3 = "12",
+	},
+	{
+		name = "proceed_8",
+		description = "Proceed (speed 8)",
+		zs3 = "8",
+	},
+	{
+		name = "proceed_6",
+		description = "Proceed (speed 6)",
+		zs3 = "6",
+	},
+	{
+		name = "proceed_4",
+		description = "Proceed (speed 4)",
+		zs3 = "4",
+	},
+}
 
-local suppasp = {
-		main = {0, 4, 6, 8, 12, 16, -1},
-		dst = {0, 4, 6, 8, 12, 16, -1, false},
-		shunt = nil,
-		proceed_as_main = true,
-		info = {
-			call_on = false,
-			dead_end = false,
-			w_speed = nil,
-		}
+local applyaspectf_distant = function(rot)
+ return function(pos, node, main_aspect, dst_aspect, dst_aspect_info)
+	if main_aspect.halt then
+		-- halt aspect, set red and don't do anything further
+		advtrains.ndb.swap_node(pos, {name="advtrains_signals_ks:vs_slow_"..rot, param2 = node.param2})
+		setzs3v(pos, nil, rot)
+		return
+	end
+	-- select appropriate lamps based on mainaspect and dst
+	if not dst_aspect_info
+			or not dst_aspect_info.main
+			or dst_aspect_info.main == -1 then
+		advtrains.ndb.swap_node(pos, {name="advtrains_signals_ks:vs_free_"..rot, param2 = node.param2})
+		setzs3v(pos, nil, rot)
+	elseif dst_aspect_info.main == 0 then
+		advtrains.ndb.swap_node(pos, {name="advtrains_signals_ks:vs_slow_"..rot, param2 = node.param2})
+		setzs3v(pos, nil, rot)
+	else
+		advtrains.ndb.swap_node(pos, {name="advtrains_signals_ks:vs_nextslow_"..rot, param2 = node.param2})
+		setzs3v(pos, dst_aspect_info.main, rot)
+	end
+ end
+end
+
+-- Main aspects distant signal
+-- Only one aspect for "expect free". Whether green or yellow lamp is shown and which speed indicator is determined by remote signal
+local mainaspects_dst = {
+	{
+		name = "expectclear",
+		description = "Expect Clear",
+	},
 }
 
 --Rangiersignal
-local setaspectf_ra = function(rot)
- return function(pos, node, asp)
-	if asp.shunt then
+local applyaspectf_ra = function(rot)
+ -- we get here the full main_aspect table
+ return function(pos, node, main_aspect, dst_aspect, dst_aspect_info)
+	if not main_aspect.halt then
+		-- any non-halt main aspect is fine, there's only one anyway
 		advtrains.ndb.swap_node(pos, {name="advtrains_signals_ks:ra_shuntd_"..rot, param2 = node.param2})
 	else
 		advtrains.ndb.swap_node(pos, {name="advtrains_signals_ks:ra_danger_"..rot, param2 = node.param2})
 	end
-	local meta = minetest.get_meta(pos)
-	if meta then
-		meta:set_string("infotext", minetest.serialize(asp))
-	end
  end
 end
 
-local suppasp_ra = {
-		main = { false },
-		dst = { false },
-		shunt = nil,
-		proceed_as_main = false,
-		
-		info = {
-			call_on = false,
-			dead_end = false,
-			w_speed = nil,
-		}
+-- Main aspects shunt signal
+-- Shunt signals have only two states, distant doesn't matter
+local mainaspects_ra = {
+	{
+		name = "shunt",
+		description = "Shunt",
+		shunt = true,
+	},
 }
 
-advtrains.trackplacer.register_tracktype("advtrains_signals_ks:hs")
-advtrains.trackplacer.register_tracktype("advtrains_signals_ks:ra")
-advtrains.trackplacer.register_tracktype("advtrains_signals_ks:sign")
-advtrains.trackplacer.register_tracktype("advtrains_signals_ks:sign_lf")
-advtrains.trackplacer.register_tracktype("advtrains_signals_ks:sign_lf7")
-advtrains.trackplacer.register_tracktype("advtrains_signals_ks:zs3")
-advtrains.trackplacer.register_tracktype("advtrains_signals_ks:zs3v")
-advtrains.trackplacer.register_tracktype("advtrains_signals_ks:mast")
-
 for _, rtab in ipairs({
-		{rot =  "0", sbox = {-1/8, -1/2, -1/2,  1/8, 1/2, -1/4}, ici=true},
-		{rot = "30", sbox = {-3/8, -1/2, -1/2, -1/8, 1/2, -1/4},},
-		{rot = "45", sbox = {-1/2, -1/2, -1/2, -1/4, 1/2, -1/4},},
-		{rot = "60", sbox = {-1/2, -1/2, -3/8, -1/4, 1/2, -1/8},},
+		{rot =  "0", sbox = {-1/8, -1/2, -1/2,  1/8, 1/2, -1/4}, ici=true, nextrot = "30"},
+		{rot = "30", sbox = {-3/8, -1/2, -1/2, -1/8, 1/2, -1/4}, nextrot = "45"},
+		{rot = "45", sbox = {-1/2, -1/2, -1/2, -1/4, 1/2, -1/4}, nextrot = "60"},
+		{rot = "60", sbox = {-1/2, -1/2, -3/8, -1/4, 1/2, -1/8}, nextrot = "0"},
 	}) do
 	local rot = rtab.rot
+	
+	-- Hauptsignal
 	for typ, prts in pairs({
-			danger   = {asp = advtrains.interlocking.DANGER, n = "slow", ici=true},
+			danger   = {asp = advtrains.interlocking.signal.ASPI_HALT, n = "slow", ici=true},
 			slow     = {
 				asp = function(pos)
 					return { main = getzs3(pos) or -1, proceed_as_main = true, dst = 0 }
@@ -196,17 +254,91 @@ for _, rtab in ipairs({
 			drop = "advtrains_signals_ks:hs_danger_0",
 			inventory_image = "advtrains_signals_ks_hs_inv.png",
 			advtrains = {
-				set_aspect = setaspectf(rot),
-				supported_aspects = suppasp,
-				get_aspect = afunc,
+				main_aspects = mainaspects_main,
+				apply_aspect = applyaspectf_main(rot),
+				get_aspect_info = afunc,
+				route_role = "main_distant",
+				trackworker_next_rot = "advtrains_signals_ks:hs_"..typ.."_"..rtab.nextrot,
+				trackworker_rot_incr_param2 = (rot=="60")
+			},
+			on_rightclick = advtrains.interlocking.signal.on_rightclick,
+			can_dig = advtrains.interlocking.signal.can_dig,
+			after_dig_node = advtrains.interlocking.signal.after_dig,
+		})
+		-- rotatable by trackworker
+	end
+	
+	-- Vorsignal (NEU!)
+	for typ, prts in pairs({
+			-- note: the names are taken from the main signal equivalent so that the same names for the lamp images can be used
+			slow   = {asp = function(pos) return { dst = 0, shunt = true } end, n = "nextslow", ici=true},
+			nextslow = {
+				asp = function(pos)
+					return { dst = getzs3v(pos) or 6, shunt = true }
+				end,
+				n = "free"
+			},
+			free     = {
+				asp = function(pos)
+					return { dst = -1, shunt = true }
+				end,
+	            n = "slow"
+			},
+		}) do
+		local tile = "advtrains_signals_ks_ltm_"..typ..".png"
+		local afunc = prts.asp
+		if type(afunc) == "table" then
+			afunc = function() return prts.asp end
+		end
+		if typ == "nextslow" then
+			tile = {
+				name = tile,
+				animation = {
+					type = "vertical_frames",
+					aspect_w = 32,
+					aspect_h = 32,
+					length = 1,
+				}
+			}
+		end
+		minetest.register_node("advtrains_signals_ks:vs_"..typ.."_"..rot, {
+			description = "Ks Distant Signal",
+			drawtype = "mesh",
+			mesh = "advtrains_signals_ks_distant_smr"..rot..".obj",
+			tiles = {"advtrains_signals_ks_mast.png", "advtrains_signals_ks_head.png", "advtrains_signals_ks_head.png", tile},
+			
+			paramtype="light",
+			sunlight_propagates=true,
+			light_source = 4,
+			
+			paramtype2 = "facedir",
+			selection_box = {
+				type = "fixed",
+				fixed = {rtab.sbox, {-1/4, -1/2, -1/4, 1/4, -7/16, 1/4}}
+			},
+			groups = {
+				cracky = 2,
+				advtrains_signal = 2,
+				not_blocking_trains = 1,
+				save_in_at_nodedb = 1,
+				not_in_creative_inventory = (rtab.ici and prts.ici) and 0 or 1,
+			},
+			drop = "advtrains_signals_ks:vs_slow_0",
+			inventory_image = "advtrains_signals_ks_vs_inv.png",
+			advtrains = {
+				main_aspects = mainaspects_dst,
+				apply_aspect = applyaspectf_distant(rot),
+				get_aspect_info = afunc,
+				route_role = "distant",
+				pure_distant = true,
+				trackworker_next_rot = "advtrains_signals_ks:vs_"..typ.."_"..rtab.nextrot,
+				trackworker_rot_incr_param2 = (rot=="60")
 			},
-			on_rightclick = advtrains.interlocking.signal_rc_handler,
-			can_dig = advtrains.interlocking.signal_can_dig,
-			after_dig_node = advtrains.interlocking.signal_after_dig,
-			after_place_node = advtrains.after_place_signal,
+			on_rightclick = advtrains.interlocking.signal.on_rightclick,
+			can_dig = advtrains.interlocking.signal.can_dig,
+			after_dig_node = advtrains.interlocking.signal.after_dig,
 		})
 		-- rotatable by trackworker
-		advtrains.trackplacer.add_worked("advtrains_signals_ks:hs", typ, "_"..rot)
 	end
 	
 	
@@ -215,14 +347,18 @@ for _, rtab in ipairs({
 			danger = {asp = { main = false, shunt = false }, n = "shuntd", ici=true},
 			shuntd = {asp = { main = false, shunt = true } , n = "danger"},
 		}) do
+		local sbox = table.copy(rtab.sbox)
+		sbox[5] = 0
+		local afunc = prts.asp
+		if type(afunc) == "table" then
+			afunc = function() return prts.asp end
+		end
 		minetest.register_node("advtrains_signals_ks:ra_"..typ.."_"..rot, {
-			description = attrans("Ks Shunting Signal"),
+			description = "Ks Shunting Signal",
 			drawtype = "mesh",
 			mesh = "advtrains_signals_ks_sht_smr"..rot..".obj",
-			tiles = {advtrains_signals_ks_mast_tile, "advtrains_signals_ks_head.png",
-				"advtrains_signals_ks_head.png", "advtrains_signals_ks_ltm_"..typ..".png"},
-			use_texture_alpha = "opaque",
-
+			tiles = {"advtrains_signals_ks_mast.png", "advtrains_signals_ks_head.png", "advtrains_signals_ks_head.png", "advtrains_signals_ks_ltm_"..typ..".png"},
+			
 			paramtype="light",
 			sunlight_propagates=true,
 			light_source = 4,
@@ -230,7 +366,11 @@ for _, rtab in ipairs({
 			paramtype2 = "facedir",
 			selection_box = {
 				type = "fixed",
-				fixed = {-1/4, -1/2, -1/4, 1/4, 0, 1/4}
+				fixed = {sbox, rotation_sbox}
+			},
+			collision_box = {
+				type = "fixed",
+				fixed = sbox,
 			},
 			groups = {
 				cracky = 2,
@@ -242,19 +382,18 @@ for _, rtab in ipairs({
 			drop = "advtrains_signals_ks:ra_danger_0",
 			inventory_image = "advtrains_signals_ks_ra_inv.png",
 			advtrains = {
-				set_aspect = setaspectf_ra(rot),
-				supported_aspects = suppasp_ra,
-				get_aspect = function(pos, node)
-					return prts.asp
-				end,
+				main_aspects = mainaspects_ra,
+				apply_aspect = applyaspectf_ra(rot),
+				get_aspect_info = afunc,
+				route_role = "shunt",
+				trackworker_next_rot = "advtrains_signals_ks:ra_"..typ.."_"..rtab.nextrot,
+				trackworker_rot_incr_param2 = (rot=="60")
 			},
-			on_rightclick = advtrains.interlocking.signal_rc_handler,
-			can_dig = advtrains.interlocking.signal_can_dig,
-			after_dig_node = advtrains.interlocking.signal_after_dig,
-			after_place_node = advtrains.after_place_signal,
+			on_rightclick = advtrains.interlocking.signal.on_rightclick,
+			can_dig = advtrains.interlocking.signal.can_dig,
+			after_dig_node = advtrains.interlocking.signal.after_dig,
 		})
 		-- rotatable by trackworker
-		advtrains.trackplacer.add_worked("advtrains_signals_ks:ra", typ, "_"..rot)
 	end
 
 	-- Schilder:
@@ -285,34 +424,35 @@ for _, rtab in ipairs({
 			drop = "advtrains_signals_ks:"..prefix.."_"..typ.."_0",
 			inventory_image = inv,
 			advtrains = {
-				get_aspect = function() return asp end
+				get_aspect_info = asp,
+				trackworker_next_rot = "advtrains_signals_ks:"..prefix.."_"..typ.."_"..rtab.nextrot,
+				trackworker_rot_incr_param2 = (rot=="60"),
+				trackworker_next_var = "advtrains_signals_ks:"..prefix.."_"..nxt.."_"..rot,
 			},
-			on_rightclick = advtrains.interlocking.signal_rc_handler,
-			can_dig = advtrains.interlocking.signal_can_dig,
-			after_dig_node = advtrains.interlocking.signal_after_dig,
-			after_place_node = advtrains.after_place_signal,
+			on_rightclick = advtrains.interlocking.signal.on_rightclick,
+			can_dig = advtrains.interlocking.signal.can_dig,
+			after_dig_node = advtrains.interlocking.signal.after_dig,
 		})
 		-- rotatable by trackworker
-		advtrains.trackplacer.add_worked("advtrains_signals_ks:"..prefix, typ, "_"..rot, nxt)
+		--TODO add rotation using trackworker
 	end
 
 	for typ, prts in pairs {
-		["hfs"] = {
-			asp = {main = false, shunt = false},
-			n = "pam",
-			--[[mesh = "_hfs",]]
-			name = "železniční návěst: posun zakázán",
-			tile2 = "advtrains_signals_ks_sign_lf7.png^(advtrains_signals_ks_sign_hfs.png^[makealpha:255,255,255)",
-		},
-		["pam"] = {
-			asp = {main = -1, shunt = false, proceed_as_main = true},
-			n = "hfs",
-			name = "železniční návěst: posun pokračuje jako normální vlak",
-			tile2 = "advtrains_signals_ks_sign_lf7.png^(advtrains_signals_ks_sign_pam.png^[makealpha:255,255,255)"
-		}
+		["hfs"] = {asp = {main = false, shunt = false}, n = "pam", mesh = "_hfs", owntile = true},
+		["pam"] = {asp = {main = -1, shunt = false, proceed_as_main = true}, n = "ne4"},
+		["ne4"] = {asp = {}, n = "ne3x1", mesh="_ne4", owntile = true},
+		["ne3x1"] = {asp = {}, n = "ne3x2", mesh="_ne3", owntile = true},
+		["ne3x2"] = {asp = {}, n = "ne3x3", mesh="_ne3", owntile = true},
+		["ne3x3"] = {asp = {}, n = "ne3x4", mesh="_ne3", owntile = true},
+		["ne3x4"] = {asp = {}, n = "ne3x5", mesh="_ne3", owntile = true},
+		["ne3x5"] = {asp = {}, n = "hfs", mesh="_ne3", owntile = true},
 	} do
 		local mesh = prts.mesh or ""
-		register_sign("sign", typ, prts.n, prts.name, "sign"..mesh, prts.tile2, typ, prts.tile2, prts.asp)
+		local tile2 = "advtrains_signals_ks_sign_lf7.png^(advtrains_signals_ks_sign_"..typ..".png^[makealpha:255,255,255)"
+		if prts.owntile then
+			tile2 = "advtrains_signals_ks_sign_"..typ..".png"
+		end
+		register_sign("sign", typ, prts.n, "Signal Sign", "sign"..mesh, tile2, "hfs", "advtrains_signals_ks_sign_lf7.png", prts.asp)
 	end
 	
 	for typ, prts in pairs {
@@ -330,8 +470,7 @@ for _, rtab in ipairs({
 		if typ == "e" then
 			tile2 = "advtrains_signals_ks_sign_zs10.png"
 		end
-		register_sign("sign", typ, prts.n, attrans("Permanent local speed restriction sign").." ("..(typ == "e" and attrans("end") or typ) ..")",
-			"sign"..mesh, tile2, "8", "advtrains_signals_ks_sign_8.png^[invert:rgb", prts.asp)
+		register_sign("sign", typ, prts.n, attrans("Permanent local speed restriction sign").." ("..(typ == "e" and attrans("end") or typ) ..")", "sign"..mesh, tile2, "8", "advtrains_signals_ks_sign_8.png^[invert:rgb", prts.asp)
 	end
 
 	for typ, prts in pairs {
@@ -344,8 +483,7 @@ for _, rtab in ipairs({
 	} do
 		local tile2 = "advtrains_signals_ks_sign_lf7.png^(advtrains_signals_ks_sign_"..typ..".png^[makealpha:255,255,255)"..(typ == "e" and "" or "^[multiply:orange")
 		local inv = "advtrains_signals_ks_sign_lf7.png^(advtrains_signals_ks_sign_8.png^[makealpha:255,255,255)^[multiply:orange"
-		register_sign("sign_lf", typ, prts.n, attrans("Temporary local speed restriction sign").." ("..(typ == "e" and attrans("end") or typ) ..")",
-			"sign", tile2, "8", inv, {main = prts.main, shunt = true, type = "temp"})
+		register_sign("sign_lf", typ, prts.n, "Temporary local speed restriction sign", "sign", tile2, "8", inv, {main = prts.main, shunt = true, type = "temp"})
 	end
 
 	for typ, prts in pairs {
@@ -353,8 +491,8 @@ for _, rtab in ipairs({
 		["6"]   = {main =  6, n = "8"},
 		["8"]   = {main =  8, n = "12"},
 		["12"]  = {main = 12, n = "16"},
-		["16"]  = {main = 16, n = "20"},
-		["20"]  = {main = 20, n = "4"},
+		["16"]  = {main = 16, n = "e"},
+		["e"]  = {main = -1, n = "4"},
 	} do
 		local tile2 = "advtrains_signals_ks_sign_lf7.png^(advtrains_signals_ks_sign_"..typ..".png^[makealpha:255,255,255)"
 		local inv = "advtrains_signals_ks_sign_lf7.png^(advtrains_signals_ks_sign_8.png^[makealpha:255,255,255)"
@@ -390,8 +528,7 @@ for _, rtab in ipairs({
 				save_in_at_nodedb = 1,
 				not_in_creative_inventory = (rtab.ici and prts.ici) and 0 or 1,
 			},
-			after_dig_node = function(pos) advtrains.ndb.update(pos) end,
-			after_place_node = advtrains.after_place_signal,
+			after_dig_node = function(pos) advtrains.ndb.update(pos) end
 		}
 
 		-- Zs 3
@@ -400,8 +537,12 @@ for _, rtab in ipairs({
 		t.mesh = "advtrains_signals_ks_zs_top_smr"..rot..".obj"
 		t.drop = "advtrains_signals_ks:zs3_off_0"
 		t.selection_box.fixed[1][5] = 0
+		t.advtrains = {
+				trackworker_next_rot = "advtrains_signals_ks:zs3_"..typ.."_"..rtab.nextrot,
+				trackworker_rot_incr_param2 = (rot=="60")
+			}
 		minetest.register_node("advtrains_signals_ks:zs3_"..typ.."_"..rot, t)
-		advtrains.trackplacer.add_worked("advtrains_signals_ks:zs3", typ, "_"..rot)
+		--TODO add rotation using trackworker
 
 		-- Zs 3v
 		local t = table.copy(def)
@@ -409,8 +550,11 @@ for _, rtab in ipairs({
 		t.mesh = "advtrains_signals_ks_zs_bottom_smr"..rot..".obj"
 		t.drop = "advtrains_signals_ks:zs3v_off_0"
 		t.tiles[3] = t.tiles[3] .. "^[multiply:yellow"
+		t.advtrains = {
+				trackworker_next_rot = "advtrains_signals_ks:zs3v_"..typ.."_"..rtab.nextrot,
+				trackworker_rot_incr_param2 = (rot=="60")
+			}
 		minetest.register_node("advtrains_signals_ks:zs3v_"..typ.."_"..rot, t)
-		advtrains.trackplacer.add_worked("advtrains_signals_ks:zs3v", typ, "_"..rot)
 	end
 	
 	minetest.register_node("advtrains_signals_ks:mast_mast_"..rot, {
@@ -435,10 +579,13 @@ for _, rtab in ipairs({
 			not_blocking_trains = 1,
 			not_in_creative_inventory = (rtab.ici) and 0 or 1,
 		},
+		advtrains = {
+			trackworker_next_rot = "advtrains_signals_ks:mast_mast_"..rtab.nextrot,
+			trackworker_rot_incr_param2 = (rot=="60")
+		},
 		drop = "advtrains_signals_ks:mast_mast_0",
-		after_place_node = advtrains.after_place_signal,
 	})
-	advtrains.trackplacer.add_worked("advtrains_signals_ks:mast","mast", "_"..rot)
+	--TODO add rotation using trackworker
 end
 
 -- Crafting
@@ -470,6 +617,23 @@ minetest.register_craft({
 	},
 })
 
+minetest.register_craft({
+	output = "advtrains_signals_ks:zs3_off_0 2",
+	recipe = {
+		{"","default:steel_ingot",""},
+		{"default:steel_ingot","dye:white","default:steel_ingot"},
+		{"","advtrains_signals_ks:mast_mast_0",""}
+	},
+})
+minetest.register_craft({
+	output = "advtrains_signals_ks:zs3v_off_0 2",
+	recipe = {
+		{"","default:steel_ingot",""},
+		{"default:steel_ingot","dye:yellow","default:steel_ingot"},
+		{"","advtrains_signals_ks:mast_mast_0",""}
+	},
+})
+
 local sign_material = "default:sign_wall_steel" --fallback
 if minetest.get_modpath("basic_materials") then
 	sign_material = "basic_materials:plastic_sheet"
diff --git a/advtrains_signals_ks/models/advtrains_signals_ks_distant_smr0.obj b/advtrains_signals_ks/models/advtrains_signals_ks_distant_smr0.obj
new file mode 100644
index 0000000..9655dc4
--- /dev/null
+++ b/advtrains_signals_ks/models/advtrains_signals_ks_distant_smr0.obj
@@ -0,0 +1,3293 @@
+# Blender 3.4.1
+# www.blender.org
+mtllib advtrains_signals_ks_distant_smr0.mtl
+o KsHauptsignal_Plane.006
+v 0.028888 -0.503378 -0.439591
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+v -0.028354 -0.503378 -0.325595
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diff --git a/advtrains_signals_ks/models/advtrains_signals_ks_distant_smr30.obj b/advtrains_signals_ks/models/advtrains_signals_ks_distant_smr30.obj
new file mode 100644
index 0000000..c6ba424
--- /dev/null
+++ b/advtrains_signals_ks/models/advtrains_signals_ks_distant_smr30.obj
@@ -0,0 +1,3291 @@
+# Blender 3.4.1
+# www.blender.org
+mtllib advtrains_signals_ks_distant_smr30.mtl
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diff --git a/advtrains_signals_ks/models/advtrains_signals_ks_distant_smr45.obj b/advtrains_signals_ks/models/advtrains_signals_ks_distant_smr45.obj
new file mode 100644
index 0000000..c9a3644
--- /dev/null
+++ b/advtrains_signals_ks/models/advtrains_signals_ks_distant_smr45.obj
@@ -0,0 +1,3296 @@
+# Blender 3.4.1
+# www.blender.org
+mtllib advtrains_signals_ks_distant_smr45.mtl
+o KsHauptsignal_Plane.006
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diff --git a/advtrains_signals_ks/models/advtrains_signals_ks_distant_smr60.obj b/advtrains_signals_ks/models/advtrains_signals_ks_distant_smr60.obj
new file mode 100644
index 0000000..a55f479
--- /dev/null
+++ b/advtrains_signals_ks/models/advtrains_signals_ks_distant_smr60.obj
@@ -0,0 +1,3293 @@
+# Blender 3.4.1
+# www.blender.org
+mtllib advtrains_signals_ks_distant_smr60.mtl
+o KsHauptsignal_Plane.006
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diff --git a/advtrains_signals_ks/models/advtrains_signals_ks_sign_ne3_smr0.obj b/advtrains_signals_ks/models/advtrains_signals_ks_sign_ne3_smr0.obj
new file mode 100644
index 0000000..01bc666
--- /dev/null
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diff --git a/advtrains_signals_ks/models/advtrains_signals_ks_sign_ne4_smr0.obj b/advtrains_signals_ks/models/advtrains_signals_ks_sign_ne4_smr0.obj
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diff --git a/advtrains_signals_ks/models/advtrains_signals_ks_sign_ne4_smr30.obj b/advtrains_signals_ks/models/advtrains_signals_ks_sign_ne4_smr30.obj
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--- /dev/null
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diff --git a/advtrains_signals_ks/textures/advtrains_signals_ks_vs_inv.png b/advtrains_signals_ks/textures/advtrains_signals_ks_vs_inv.png
new file mode 100644
index 0000000..1e4acfd
--- /dev/null
+++ b/advtrains_signals_ks/textures/advtrains_signals_ks_vs_inv.png
diff --git a/advtrains_signals_muc_ubahn/init.lua b/advtrains_signals_muc_ubahn/init.lua
new file mode 100755
index 0000000..182a3dc
--- /dev/null
+++ b/advtrains_signals_muc_ubahn/init.lua
@@ -0,0 +1,88 @@
+-- advtrains_signals_muc_ubahn
+-- Signals modeled after the Munich U-Bahn signalling system
+-- It reuses the original historic wall signal mesh, but extends it to 4 signal lamps and supports the new signal API only. 
+
+-- For a reference of the signals (in German) see: https://www.u-bahn-muenchen.de/betrieb/zugsicherung/signale/
+-- Hp4 and Hp5 are not implemented because they do not make sense.
+-- Also the speed signals are not yet added (they will be added later)
+
+local all_sigs = {
+	hp0 = { asp = { main = 0 }, crea = true }, -- halt
+	hp1 = { asp = { main = -1, proceed_as_main = true } }, -- free full speed
+	hp2 = { asp = { main = 12, proceed_as_main = true } }, -- slow speed
+	hp3 = { asp = { main = 0, shunt = true } }, -- shunting
+	vr0 = { asp = { dst = 0 }, distant = true, crea = true }, -- distant halt/slow
+	vr1 = { asp = { dst = -1 }, distant = true }, -- distant free
+}
+
+local mainaspects = {
+	{ name = "hp1", description = "Hp1: Full speed" },
+	{ name = "hp2", description = "Hp2: Reduced Speed" },
+	{ name = "hp3", description = "Hp3: Shunt" },
+}
+local dstaspects = {
+	{ name = "vr1", description = "Vr1: Expect Full speed" },
+}
+
+local function applyaspect_main(loc)
+	return function(pos, node, main_aspect, rem_aspect, rem_aspinfo)
+		local ma_node = main_aspect.name
+		if all_sigs[ma_node] and not all_sigs[ma_node].distant then
+			-- ma_node is fine
+		elseif main_aspect.halt then
+			ma_node = "hp0" -- default halt aspect
+		else
+			ma_node = "hp1" -- default free aspect
+		end
+		advtrains.ndb.swap_node(pos, {name = "advtrains_signals_muc_ubahn:signal_wall_"..loc.."_"..ma_node, param2 = node.param2})
+	end
+end
+
+local function applyaspect_distant(loc)
+	return function(pos, node, main_aspect, rem_aspect, rem_aspinfo)
+		local ma_node = "vr0" -- show expect stop by default
+		if not main_aspect.halt and (not rem_aspinfo or not rem_aspinfo.main or rem_aspinfo.main>12 or rem_aspinfo.main==-1) then
+			ma_node = "vr1" -- show free when dst is at least 12
+		end
+		advtrains.ndb.swap_node(pos, {name = "advtrains_signals_muc_ubahn:signal_wall_"..loc.."_"..ma_node, param2 = node.param2})
+	end
+end
+
+for r,f in pairs(all_sigs) do
+	for loc, sbox in pairs({l={-1/2, -1/2, -1/4, 0, 1/2, 1/4}, r={0, -1/2, -1/4, 1/2, 1/2, 1/4}, t={-1/2, 0, -1/4, 1/2, 1/2, 1/4}}) do
+		minetest.register_node("advtrains_signals_muc_ubahn:signal_wall_"..loc.."_"..r, {
+			drawtype = "mesh",
+			paramtype="light",
+			paramtype2="facedir",
+			walkable = false,
+			selection_box = {
+				type = "fixed",
+				fixed = sbox,
+			},
+			mesh = "advtrains_signals_muc_ubahn_wsig_"..loc..".obj",
+			tiles = {"advtrains_signals_muc_ubahn_"..r..".png"},
+			drop = f.distant and "advtrains_signals_muc_ubahn:signal_wall_"..loc.."_vr0" or "advtrains_signals_muc_ubahn:signal_wall_"..loc.."_hp0",
+			description = f.distant and attrans("Munich U-Bahn Distant Signal ("..loc..")") or attrans("Munich U-Bahn Main Signal ("..loc..")"),
+			groups = {
+				cracky=3,
+				not_blocking_trains=1,
+				save_in_at_nodedb=1,
+				advtrains_signal = 2,
+				not_in_creative_inventory = f.crea and 0 or 1
+			},
+			light_source = 1,
+			sunlight_propagates=true,
+			on_rightclick = advtrains.interlocking.signal.on_rightclick,
+			can_dig = advtrains.interlocking.signal.can_dig,
+			after_dig_node = advtrains.interlocking.signal.after_dig,
+			-- new signal API
+			advtrains = {
+				main_aspects = f.distant and dstaspects or mainaspects, -- main aspects only for main
+				apply_aspect = f.distant and applyaspect_distant(loc) or applyaspect_main(loc),
+				pure_distant = f.distant,
+				get_aspect_info = function() return f.asp end,
+				route_role = f.distant and "distant" or "main"
+			},
+		})
+	end
+end
diff --git a/advtrains_signals_muc_ubahn/mod.conf b/advtrains_signals_muc_ubahn/mod.conf
new file mode 100644
index 0000000..05d1624
--- /dev/null
+++ b/advtrains_signals_muc_ubahn/mod.conf
@@ -0,0 +1,5 @@
+name=advtrains_signals_muc_ubahn
+title=Advtrains Interlocking Signal Set - Munich U-Bahn signals
+description=Subway signal set for the Advanced Trains Interlocking system modeled after Munich U-Bahn signals
+author=orwell96
+depends=advtrains_interlocking
diff --git a/advtrains_signals_muc_ubahn/models/advtrains_signals_muc_ubahn_wsig_l.obj b/advtrains_signals_muc_ubahn/models/advtrains_signals_muc_ubahn_wsig_l.obj
new file mode 100644
index 0000000..5e80955
--- /dev/null
+++ b/advtrains_signals_muc_ubahn/models/advtrains_signals_muc_ubahn_wsig_l.obj
@@ -0,0 +1,2137 @@
+# Blender 3.4.1
+# www.blender.org
+mtllib advtrains_signals_muc_ubahn_wsig_l.mtl
+o Cube
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diff --git a/advtrains_signals_muc_ubahn/models/advtrains_signals_muc_ubahn_wsig_r.obj b/advtrains_signals_muc_ubahn/models/advtrains_signals_muc_ubahn_wsig_r.obj
new file mode 100644
index 0000000..6843591
--- /dev/null
+++ b/advtrains_signals_muc_ubahn/models/advtrains_signals_muc_ubahn_wsig_r.obj
@@ -0,0 +1,2137 @@
+# Blender 3.4.1
+# www.blender.org
+mtllib advtrains_signals_muc_ubahn_wsig_r.mtl
+o Cube
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diff --git a/advtrains_signals_muc_ubahn/models/advtrains_signals_muc_ubahn_wsig_t.mtl b/advtrains_signals_muc_ubahn/models/advtrains_signals_muc_ubahn_wsig_t.mtl
new file mode 100644
index 0000000..69697a9
--- /dev/null
+++ b/advtrains_signals_muc_ubahn/models/advtrains_signals_muc_ubahn_wsig_t.mtl
@@ -0,0 +1,12 @@
+# Blender 3.4.1 MTL File: 'signal_wall_ceiling_muc_ubahn.blend'
+# www.blender.org
+
+newmtl Material
+Ns 250.000000
+Ka 1.000000 1.000000 1.000000
+Kd 0.800000 0.800000 0.800000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.000000
+d 1.000000
+illum 2
diff --git a/advtrains_signals_muc_ubahn/models/advtrains_signals_muc_ubahn_wsig_t.obj b/advtrains_signals_muc_ubahn/models/advtrains_signals_muc_ubahn_wsig_t.obj
new file mode 100644
index 0000000..c443b3c
--- /dev/null
+++ b/advtrains_signals_muc_ubahn/models/advtrains_signals_muc_ubahn_wsig_t.obj
@@ -0,0 +1,2138 @@
+# Blender 3.4.1
+# www.blender.org
+mtllib advtrains_signals_muc_ubahn_wsig_t.mtl
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+f 465/834/36 529/944/36 530/946/36 466/835/36
+f 480/849/40 544/974/40 545/977/40 481/850/40
+f 432/777/35 496/876/35 495/873/35 431/775/35
+f 457/826/39 521/927/39 523/931/39 459/828/39
+f 447/807/20 511/906/20 510/904/20 446/805/20
+f 473/842/41 537/960/41 538/962/41 474/843/41
+f 488/858/26 552/992/26 522/929/26 458/827/26
+f 436/785/28 500/884/28 499/882/28 435/783/28
+f 466/835/42 530/946/42 531/948/42 467/836/42
+f 481/850/43 545/977/43 546/979/43 482/851/43
+f 451/815/42 515/915/42 514/913/42 450/813/42
+f 440/793/38 504/892/38 503/890/38 439/791/38
+f 459/828/44 523/931/44 524/933/44 460/829/44
+f 429/771/45 493/869/45 492/867/45 428/769/45
+f 474/843/17 538/962/17 539/964/17 475/844/17
+f 455/823/16 519/923/16 518/921/16 454/821/16
+f 426/765/41 489/860/41 490/863/41 425/763/41
+f 444/801/44 508/900/44 507/898/44 443/799/44
+f 467/836/27 531/948/27 532/950/27 468/837/27
+f 482/851/33 546/979/33 547/981/33 483/852/33
+f 433/779/46 497/878/46 496/876/46 432/777/46
diff --git a/advtrains_signals_muc_ubahn/textures/advtrains_signals_muc_ubahn_hp0.png b/advtrains_signals_muc_ubahn/textures/advtrains_signals_muc_ubahn_hp0.png
new file mode 100644
index 0000000..6e8ca57
--- /dev/null
+++ b/advtrains_signals_muc_ubahn/textures/advtrains_signals_muc_ubahn_hp0.png
diff --git a/advtrains_signals_muc_ubahn/textures/advtrains_signals_muc_ubahn_hp1.png b/advtrains_signals_muc_ubahn/textures/advtrains_signals_muc_ubahn_hp1.png
new file mode 100644
index 0000000..d9fa346
--- /dev/null
+++ b/advtrains_signals_muc_ubahn/textures/advtrains_signals_muc_ubahn_hp1.png
diff --git a/advtrains_signals_muc_ubahn/textures/advtrains_signals_muc_ubahn_hp2.png b/advtrains_signals_muc_ubahn/textures/advtrains_signals_muc_ubahn_hp2.png
new file mode 100644
index 0000000..1fd1919
--- /dev/null
+++ b/advtrains_signals_muc_ubahn/textures/advtrains_signals_muc_ubahn_hp2.png
diff --git a/advtrains_signals_muc_ubahn/textures/advtrains_signals_muc_ubahn_hp3.png b/advtrains_signals_muc_ubahn/textures/advtrains_signals_muc_ubahn_hp3.png
new file mode 100644
index 0000000..8588b12
--- /dev/null
+++ b/advtrains_signals_muc_ubahn/textures/advtrains_signals_muc_ubahn_hp3.png
diff --git a/advtrains_signals_muc_ubahn/textures/advtrains_signals_muc_ubahn_template.png b/advtrains_signals_muc_ubahn/textures/advtrains_signals_muc_ubahn_template.png
new file mode 100755
index 0000000..0bab765
--- /dev/null
+++ b/advtrains_signals_muc_ubahn/textures/advtrains_signals_muc_ubahn_template.png
diff --git a/advtrains_signals_muc_ubahn/textures/advtrains_signals_muc_ubahn_vr0.png b/advtrains_signals_muc_ubahn/textures/advtrains_signals_muc_ubahn_vr0.png
new file mode 100644
index 0000000..d327bc3
--- /dev/null
+++ b/advtrains_signals_muc_ubahn/textures/advtrains_signals_muc_ubahn_vr0.png
diff --git a/advtrains_signals_muc_ubahn/textures/advtrains_signals_muc_ubahn_vr1.png b/advtrains_signals_muc_ubahn/textures/advtrains_signals_muc_ubahn_vr1.png
new file mode 100644
index 0000000..494e890
--- /dev/null
+++ b/advtrains_signals_muc_ubahn/textures/advtrains_signals_muc_ubahn_vr1.png
diff --git a/advtrains_trackmap/fsrender.lua b/advtrains_trackmap/fsrender.lua
new file mode 100644
index 0000000..340b08c
--- /dev/null
+++ b/advtrains_trackmap/fsrender.lua
@@ -0,0 +1,41 @@
+-- fsrender.lua

+-- Rendering of a grid of characters into a formspec

+

+local tm = advtrains.trackmap

+

+function tm.render_grid_formspec(formsize_x, formsize_y, gridtbl, origin_pos, width, height)

+	local grid = gridtbl.grid

+	local gcolor = gridtbl.gcolor

+	local s = {

+		"formspec_version[3]",

+		"size["..formsize_x..","..formsize_y.."]",

+		"no_prepend[]",

+		"bgcolor[white;false;white]",

+		"style_type[label;font=mono]",

+		"label[0,0;",

+		minetest.get_color_escape_sequence("black")

+		}

+	local last_color = nil

+	for z=height-1, 0, -1 do

+		-- render a row

+		for x=0,width-1 do

+			local apos_x = origin_pos.x + x

+			local apos_z = origin_pos.z + z

+			local chr = " "

+			if grid[apos_x] and grid[apos_x][apos_z] then

+				local color = gcolor[apos_x][apos_z]

+				if color ~= last_color then

+					-- change the color of the text

+					table.insert(s, minetest.get_color_escape_sequence(color or "black"))

+					last_color = color

+				end

+				chr = grid[apos_x][apos_z]

+			end

+			table.insert(s, chr)

+		end

+		table.insert(s,"\n")

+	end

+	table.insert(s, "]")

+	table.insert(s, "style_type[label;font=]") -- reset font style

+	return table.concat(s)

+end
\ No newline at end of file
diff --git a/advtrains_trackmap/grid.lua b/advtrains_trackmap/grid.lua
new file mode 100644
index 0000000..4c98b2f
--- /dev/null
+++ b/advtrains_trackmap/grid.lua
@@ -0,0 +1,107 @@
+-- grid.lua

+-- routines taking the tracks and building a grid out of them

+

+local tm = advtrains.trackmap

+

+-- Maximum scan length for track iterator

+local TS_MAX_SCAN = 1000

+

+-- Get a character matching the class requested by chr, in the correct orientation for conndir

+-- The characters will be chosen from the unicode frame set if appropriate

+-- valid character classes -, =, |

+local char_equiv = {

+	["-"] = {"│", "/", "─", "\\\\"}, -- single-line

+	["="] = {"║", "/", "═", "\\\\"}, -- double-line

+	["|"] = {"─", "\\\\", "│", "/"}, -- break (i.e. TCB, perpendicular to orientation)

+}

+local dir_to_charmap = {

+	[15] = 1,

+	[ 0] = 1,

+	[ 1] = 1,

+	[ 2] = 2,

+	[ 3] = 3,

+	[ 4] = 3,

+	[ 5] = 3,

+	[ 6] = 4,

+	[ 7] = 1,

+	[ 8] = 1,

+	[ 9] = 1,

+	[10] = 2,

+	[11] = 3,

+	[12] = 3,

+	[13] = 3,

+	[14] = 4,

+}

+function tm.rotate_char_class_by_conn(chr, conndir)

+	--atdebug("rotatechar", chr, conndir, "dircharmap", dir_to_charmap[conndir], "charequiv", char_equiv[chr])

+	return char_equiv[chr][dir_to_charmap[conndir]]

+end

+

+-- Generate a grid map by walking tracks starting from the given position start_pos

+-- For every track that is visited, node_callback is called.

+-- signature: node_callback(pos, conns, connid)

+-- should return a table as follows:

+-- {

+--   char = "X" -- the character to use in this place, defaults to guessing a fitting frame character

+--   color = "colorstring" or nil -- the color to render the character with

+--   stop = false -- if true, the iterator will stop following this branch

+-- }

+-- Returning nil will assume defaults.

+-- return value: a table:

+-- {

+--   grid = <grid> - access abs_grid[x][y] - contains one character per cell

+--   min_pos = <pos> - the minimum pos contained in this grid

+--   max_pos = <pos> - the maximum pos

+-- }

+function tm.generate_grid_map(start_pos, node_callback)

+	local ti = advtrains.get_track_iterator(start_pos, nil, TS_MAX_SCAN, true)

+	local grid = {} -- grid[x][y]

+	local gcolor = {} -- grid[x][y]

+	local gylev = {} -- grid[x][y]

+	local gminx, gmaxx, gminz, gmaxz = start_pos.x, start_pos.x, start_pos.z, start_pos.z

+	

+	while ti:has_next_branch() do

+		pos, connid = ti:next_branch()

+		repeat

+			local ok, conns = advtrains.get_rail_info_at(pos)

+			local c = node_callback(pos, conns, connid)

+			local chr = c and c.char

+			--atdebug("init",pos.x,pos.z,chr,"")

+			if not chr then

+				chr = tm.rotate_char_class_by_conn("=", conns[connid].c)

+			end

+			

+			-- add the char to the grid

+			if not grid[pos.x] then

+				grid[pos.x] = {}

+				gcolor[pos.x] = {}

+				gylev[pos.x] = {}

+			end

+			

+			-- ensure that higher rails are rendered on top

+			local prev_ylev = gylev[pos.x][pos.z]

+			if not prev_ylev or prev_ylev < pos.y then

+				grid[pos.x][pos.z] = chr

+				gylev[pos.x][pos.z] = pos.y

+				if c and c.color then

+					gcolor[pos.x][pos.z] = c.color

+				end

+			end

+			

+			gminx = math.min(gminx, pos.x)

+			gmaxx = math.max(gmaxx, pos.x)

+			gminz = math.min(gminz, pos.z)

+			gmaxz = math.max(gmaxz, pos.z)

+			

+			if c and c.stop then break end

+			pos, connid = ti:next_track()

+		until not pos

+	end

+	return {

+		grid = grid,

+		gcolor = gcolor,

+		min_pos = {x=gminx, z=gminz},

+		max_pos = {x=gmaxx, z=gmaxz},

+	}

+end

+

diff --git a/advtrains_trackmap/init.lua b/advtrains_trackmap/init.lua
new file mode 100644
index 0000000..060e597
--- /dev/null
+++ b/advtrains_trackmap/init.lua
@@ -0,0 +1,14 @@
+-- Advtrains track map
+-- Replacement of itrainmap
+
+advtrains.trackmap = {}
+
+
+local modpath = minetest.get_modpath(minetest.get_current_modname()) .. DIR_DELIM
+
+
+dofile(modpath.."grid.lua")
+dofile(modpath.."fsrender.lua")
+dofile(modpath.."viewer.lua")
+
+
diff --git a/advtrains_trackmap/mod.conf b/advtrains_trackmap/mod.conf
new file mode 100644
index 0000000..633f1e2
--- /dev/null
+++ b/advtrains_trackmap/mod.conf
@@ -0,0 +1,6 @@
+name=advtrains_trackmap
+title=Advanced Trains Track Map
+description=Formspec-based map to display track layouts
+author=orwell96
+
+depends=advtrains
diff --git a/advtrains_trackmap/viewer.lua b/advtrains_trackmap/viewer.lua
new file mode 100644
index 0000000..b7205c8
--- /dev/null
+++ b/advtrains_trackmap/viewer.lua
@@ -0,0 +1,43 @@
+-- viewer.lua

+-- standalone chatcommand/tool trackmap viewer window

+

+local tm = advtrains.trackmap

+

+local function node_left_click(pos, pname)

+	local node_ok, conns, rail_y=advtrains.get_rail_info_at(pos)

+	if not node_ok then

+		minetest.chat_send_player(pname, "Node is not a track!")

+		return

+	end

+	

+	local function node_callback(npos, conns, connid)

+		if vector.equals(pos, npos) then

+			return {color = "red"}

+		end

+		return nil

+	end

+

+	local gridtbl = tm.generate_grid_map(pos, node_callback)

+	local fslabel = tm.render_grid_formspec(20, 20, gridtbl, {x=pos.x-35, z=pos.z-22}, 70, 44)

+	

+	minetest.show_formspec(pname, "advtrains_trackmap:test", fslabel)

+end

+

+

+minetest.register_craftitem("advtrains_trackmap:tool",{

+	description = "Trackmap Tool\nPunch: Show map",

+	groups = {cracky=1}, -- key=name, value=rating; rating=1..3.

+	inventory_image = "at_il_tool.png",

+	wield_image = "at_il_tool.png",

+	stack_max = 1,

+	on_use = function(itemstack, player, pointed_thing)

+		local pname = player:get_player_name()

+		if not pname then

+			return

+		end

+		if pointed_thing.type=="node" then

+			local pos=pointed_thing.under

+			node_left_click(pos, pname)

+		end

+	end

+})
\ No newline at end of file
diff --git a/advtrains_train_track/init.lua b/advtrains_train_track/init.lua
index 5403ff7..c773839 100644
--- a/advtrains_train_track/init.lua
+++ b/advtrains_train_track/init.lua
@@ -2,6 +2,181 @@ ch_base.open_mod(minetest.get_current_modname())
 -- Default tracks for advtrains
 -- (c) orwell96 and contributors
 
+local default_boxen = {
+    ["st"] = {
+        [""] = {
+            selection_box = {
+                type = "fixed",
+                fixed = {-1/2-1/16, -1/2, -1/2, 1/2+1/16, -1/2+2/16, 1/2},
+            }
+        },
+        ["_30"] = {
+            selection_box = {
+                type = "fixed",
+                fixed = {
+                    {-0.5000, -0.5000, -1.000, 0.5000, -0.3750, 1.000},
+                    {-0.8750, -0.5000, -1.000, -0.5000, -0.3750, 0.2500},
+                    {0.5000, -0.5000, -0.2500, 0.8750, -0.3750, 1.000},
+                    {-0.1250, -0.5000, -1.375, 0.1875, -0.3750, -1.000}
+                }
+            }
+        },
+        ["_45"] = {
+            selection_box = {
+                type = "fixed",
+                fixed = {
+                    {-0.5000, -0.5000, -0.8750, 0.5000, -0.3750, 0.8750},
+                    {0.5000, -0.5000, -0.5000, 0.8750, -0.3750, 0.5000},
+                    {-0.8750, -0.5000, -0.5000, -0.5000, -0.3750, 0.5000}
+                }
+            }
+        },
+        ["_60"] = {
+            selection_box = {
+                type = "fixed",
+                fixed = {
+                    {-1.000, -0.5000, -0.5000, 1.000, -0.3750, 0.5000},
+                    {-1.000, -0.5000, -0.8750, 0.2500, -0.3750, -0.5000},
+                    {-0.2500, -0.5000, 0.5000, 1.000, -0.3750, 0.8750},
+                    {-1.375, -0.5000, -0.1250, -1.000, -0.3750, 0.1875}
+                }
+            }
+        },
+    },
+
+    ["cr"] = {
+        [""] = {
+            selection_box = {
+                type = "fixed",
+                fixed = {
+                    {-0.5000, -0.5000, -0.5000, 0.6875, -0.3750, 0.5000},
+                    {-0.3750, -0.5000, -1.000, 1.000, -0.3750, 0.000}
+                }
+            }
+        },
+        ["_30"] = {
+            selection_box = {
+                type = "fixed",
+                fixed = {
+                    {-0.5000, -0.5000, -0.5000, 0.7500, -0.3750, 0.8750},
+                    {-0.3750, -0.5000, 0.8750, 0.2500, -0.3750, 1.188},
+                    {0.7500, -0.5000, 0.2500, 1.063, -0.3750, 0.8750}
+                }
+            }
+        },
+        ["_45"] = {
+            selection_box = {
+                type = "fixed",
+                fixed = {
+                    {-0.5000, -0.5000, -1.125, 0.5000, -0.3750, 0.6875},
+                    {-0.8750, -0.5000, -0.9375, -0.5000, -0.3750, 0.06250},
+                    {0.5000, -0.5000, -0.5000, 0.8750, -0.3750, 0.5000}
+                }
+            }
+        },
+        ["_60"] = {
+            selection_box = {
+                type = "fixed",
+                fixed = {
+                    {-0.8125, -0.5000, -0.5000, 1.188, -0.3750, 0.5000},
+                    {-0.1875, -0.5000, 0.5000, 0.8750, -0.3125, 0.8750},
+                    {-0.2500, -0.5000, -0.9375, 0.3125, -0.3125, -0.5000}
+                }
+            }
+        },
+    },
+
+    ["swlst"] = {
+        [""] = {
+            selection_box = {
+                type = "fixed",
+                fixed = {
+                    {-0.5000, -0.5000, -0.5000, 0.6250, -0.3750, 0.5000},
+                    {-0.3125, -0.5000, -1.000, 0.9375, -0.3125, -0.06250}
+                }
+            }
+        },
+        ["_30"] = {
+            selection_box = {
+                type = "fixed",
+                fixed = {
+                    {-0.5000, -0.5000, -1.000, 0.5000, -0.3750, 1.000},
+                    {-0.8750, -0.5000, -1.000, -0.5000, -0.3750, 0.2500},
+                    {0.5000, -0.5000, -0.2500, 0.8750, -0.3750, 1.000},
+                    {-0.1250, -0.5000, -1.375, 0.1875, -0.3750, -1.000}
+                }
+            }
+        },
+        ["_45"] = {
+            selection_box = {
+                type = "fixed",
+                fixed = {
+                    {-0.5000, -0.5000, -1.1875, 0.5000, -0.3750, 0.8750},
+                    {0.5000, -0.5000, -0.5000, 0.8750, -0.3750, 0.5000},
+                    {-0.8750, -0.5000, -0.8125, -0.5000, -0.3750, 0.5000}
+                }
+            }
+        },
+        ["_60"] = {
+            selection_box = {
+                type = "fixed",
+                fixed = {
+                    {-1.000, -0.5000, -0.5000, 1.000, -0.3750, 0.5000},
+                    {-1.000, -0.5000, -0.8750, 0.2500, -0.3750, -0.5000},
+                    {-0.2500, -0.5000, 0.5000, 1.000, -0.3750, 0.8750},
+                    {-1.375, -0.5000, -0.1250, -1.000, -0.3750, 0.1875}
+                }
+            }
+        },
+    },
+
+    ["swrst"] = {
+        [""] = {
+            selection_box = {
+                type = "fixed",
+                fixed = {
+                    {-0.5000, -0.5000, -0.5000, 0.6250, -0.3750, 0.5000},
+                    {-0.8125, -0.5000, -1.000, 0.4375, -0.3125, -0.06250}
+                }
+            }
+        },
+        ["_30"] = {
+            selection_box = {
+                type = "fixed",
+                fixed = {
+                    {-0.5000, -0.5000, -1.000, 0.5000, -0.3750, 1.000},
+                    {-0.8750, -0.5000, -1.000, -0.5000, -0.3750, 0.2500},
+                    {0.5000, -0.5000, -0.2500, 0.8750, -0.3750, 1.000},
+                    {-0.1250, -0.5000, -1.375, 0.1875, -0.3750, -1.000}
+                }
+            }
+        },
+        ["_45"] = {
+            selection_box = {
+                type = "fixed",
+                fixed = {
+                    {-1.1875, -0.5000, -0.5000, 0.8750, -0.3750, 0.5000},
+                    {-0.5000, -0.5000, 0.5000, 0.5000, -0.3750, 0.8750},
+                    {-0.8125, -0.5000, -0.8750, 0.5000, -0.3750, -0.5000}
+                }
+            }
+        },
+        ["_60"] = {
+            selection_box = {
+                type = "fixed",
+                fixed = {
+                    {-1.000, -0.5000, -0.5000, 1.000, -0.3750, 0.5000},
+                    {-1.000, -0.5000, -0.8750, 0.2500, -0.3750, -0.5000},
+                    {-0.2500, -0.5000, 0.5000, 1.000, -0.3750, 0.8750},
+                    {-1.375, -0.5000, -0.1250, -1.000, -0.3750, 0.1875}
+                }
+            }
+        },
+    },
+}
+
+default_boxen["swlcr"] = default_boxen["swlst"]
+default_boxen["swrcr"] = default_boxen["swrst"]
 
 --flat
 advtrains.register_tracks("default", {
@@ -12,6 +187,14 @@ advtrains.register_tracks("default", {
 	shared_texture="advtrains_dtrack_shared.png",
 	description=attrans("Track"),
 	formats={},
+
+    get_additional_definiton = function(def, preset, suffix, rotation)
+        if default_boxen[suffix] ~= nil and default_boxen[suffix][rotation] ~= nil then
+            return default_boxen[suffix][rotation]
+        else
+            return {}
+        end
+    end,
 }, advtrains.ap.t_30deg_flat)
 
 minetest.register_craft({
@@ -23,6 +206,59 @@ minetest.register_craft({
 	},
 })
 
+local y3_boxen = {
+    [""] = {
+        selection_box = {
+            type = "fixed",
+            fixed = {
+                {-0.8750, -0.5000, -1.125, 0.8750, -0.3750, 0.4375}
+            }
+        }
+    },
+
+    ["_30"] = {
+        selection_box = {
+            type = "fixed",
+            fixed = {
+                {-0.5000, -0.5000, -0.875, 0.5000, -0.3750, 1.000},
+                {-0.8750, -0.5000, -0.4375, -0.5000, -0.3750, 0.5625},
+                {0.5000, -0.5000, -0.2500, 0.8125, -0.3750, 1.000},
+            }
+        }
+    },
+
+    --UX FIXME: - 3way - have to place straight route before l and r or the 
+    --nodebox overlaps too much and can't place the straight track node.
+    ["_45"] = {
+        selection_box = {
+            type = "fixed",
+            fixed = {
+                {-0.5000, -0.5000, -1.1250, 0.5000, -0.3750, 0.8750},
+                {0.5000, -0.5000, -0.5000, 0.8750, -0.3750, 0.5000},
+                {-1.1250, -0.5000, -0.9375, -0.5000, -0.3750, 0.5000}
+            }
+        }
+    },
+
+    ["_60"] = {
+        selection_box = {
+            type = "fixed",
+            fixed = {
+                --{-0.5000, -0.5000, -0.875, 0.5000, -0.3750, 1.000},
+                {-0.875, -0.5000, -0.5, 1.0, -0.3750, 0.5},
+                --{-0.8750, -0.5000, -0.4375, -0.5000, -0.3750, 0.5625},
+                {-0.4375, -0.5000, -0.8750, 0.5625, -0.3750, -0.5000},
+                --{0.5000, -0.5000, -0.2500, 0.8125, -0.3750, 1.000},
+                {-0.2500, -0.5000, -0.2500, 1.0000, -0.3750, 0.8125},
+            }
+        }
+    },
+}
+
+
+local function y3_turnouts_addef(def, preset, suffix, rotation)
+    return y3_boxen[rotation] or {}
+end
 -- y-turnout
 advtrains.register_tracks("default", {
 	nodename_prefix="advtrains:dtrack_sy",
@@ -32,6 +268,7 @@ advtrains.register_tracks("default", {
 	shared_texture="advtrains_dtrack_shared.png",
 	description=attrans("Y-turnout"),
 	formats = {},
+    get_additional_definiton = y3_turnouts_addef,
 }, advtrains.ap.t_yturnout)
 minetest.register_craft({
 	output = 'advtrains:dtrack_sy_placer 2',
@@ -50,6 +287,7 @@ advtrains.register_tracks("default", {
 	shared_texture="advtrains_dtrack_shared.png",
 	description=attrans("3-way turnout"),
 	formats = {},
+    get_additional_definiton = y3_turnouts_addef,
 }, advtrains.ap.t_s3way)
 minetest.register_craft({
 	output = 'advtrains:dtrack_s3_placer 1',
@@ -61,6 +299,35 @@ minetest.register_craft({
 })
 
 -- Diamond Crossings
+
+local perp_boxen = {
+    [""] = {}, --default size
+    ["_30"] = {
+        selection_box = {
+            type = "fixed",
+            fixed = {
+                {-1.000, -0.5000, -1.000, 1.000, -0.3750, 1.000}
+            }
+        }
+    },
+    ["_45"] = {
+        selection_box = {
+            type = "fixed",
+            fixed = {
+                {-0.8125, -0.5000, -0.8125, 0.8125, -0.3750, 0.8125}
+            }
+        }
+    },
+    ["_60"] = {
+        selection_box = {
+            type = "fixed",
+            fixed = {
+                {-1.000, -0.5000, -1.000, 1.000, -0.3750, 1.000}
+            }
+        }
+    },
+}
+
 -- perpendicular
 advtrains.register_tracks("default", {
 	nodename_prefix="advtrains:dtrack_xing",
@@ -69,7 +336,10 @@ advtrains.register_tracks("default", {
 	models_suffix=".obj",
 	shared_texture="advtrains_dtrack_shared.png",
 	description=attrans("Perpendicular Diamond Crossing Track"),
-	formats = {}
+	formats = {},
+    get_additional_definiton = function(def, preset, suffix, rotation)
+        return perp_boxen[rotation] or {}
+    end
 }, advtrains.ap.t_perpcrossing)
 
 minetest.register_craft({
@@ -81,6 +351,73 @@ minetest.register_craft({
 	}
 })
 
+local ninety_plus_boxen = {
+    ["30l"] = {
+        selection_box = {
+            type = "fixed",
+            fixed = {
+                {-0.5000, -0.5000, -1.000, 0.5000, -0.3750, 1.000},
+                {-0.8750, -0.5000, -1.000, -0.5000, -0.3750, 0.2500},
+                {0.5000, -0.5000, -0.2500, 0.8750, -0.3750, 1.000},
+                {-0.1250, -0.5000, -1.375, 0.1875, -0.3750, -1.000}
+            }
+        }
+    },
+    ["30r"] = {
+        selection_box = {
+            type = "fixed",
+            fixed = {
+                {0.5000, -0.5000, -1.000, -0.5000, -0.3750, 1.000},
+                {0.8750, -0.5000, -1.000, 0.5000, -0.3750, 0.2500},
+                {-0.5000, -0.5000, -0.2500, -0.8750, -0.3750, 1.000},
+                {0.1250, -0.5000, -1.375, -0.1875, -0.3750, -1.000}
+            }
+        }
+    },
+    ["45l"] = {
+        selection_box = {
+            type = "fixed",
+            fixed = {
+                {-0.5000, -0.5000, -0.8750, 0.5000, -0.3750, 0.8750},
+                {0.5000, -0.5000, -0.5000, 0.8750, -0.3750, 0.5000},
+                {-0.8750, -0.5000, -0.5000, -0.5000, -0.3750, 0.5000}
+            }
+        }
+    },
+    ["45r"] = {
+        selection_box = {
+            type = "fixed",
+            fixed = {
+                {-0.5000, -0.5000, -0.8750, 0.5000, -0.3750, 0.8750},
+                {0.5000, -0.5000, -0.5000, 0.8750, -0.3750, 0.5000},
+                {-0.8750, -0.5000, -0.5000, -0.5000, -0.3750, 0.5000}
+            }
+        }
+    },
+    ["60l"] = {
+        selection_box = {
+            type = "fixed",
+            fixed = {
+                {-1.000, -0.5000, -0.5000, 1.000, -0.3750, 0.5000},
+                {-1.000, -0.5000, -0.8750, 0.2500, -0.3750, -0.5000},
+                {-0.2500, -0.5000, 0.5000, 1.000, -0.3750, 0.8750},
+                {-1.375, -0.5000, -0.1250, -1.000, -0.3750, 0.1875}
+            }
+        }
+    },
+    ["60r"] = {
+        selection_box = {
+            type = "fixed",
+            fixed = {
+                {1.000, -0.5000, -0.5000, -1.000, -0.3750, 0.5000},
+                {1.000, -0.5000, -0.8750, -0.2500, -0.3750, -0.5000},
+                {0.2500, -0.5000, 0.5000, -1.000, -0.3750, 0.8750},
+                {1.375, -0.5000, -0.1250, 1.000, -0.3750, 0.1875}
+            }
+        }
+    },
+}
+
 -- 90plusx
 -- When you face east and param2=0, then this set of rails has a rail at 90
 -- degrees to the viewer, plus another rail crossing at 30, 45 or 60 degrees.
@@ -91,7 +428,10 @@ advtrains.register_tracks("default", {
 	models_suffix=".obj",
 	shared_texture="advtrains_dtrack_shared.png",
 	description=attrans("90+Angle Diamond Crossing Track"),
-	formats = {}
+	formats = {},
+    get_additional_definiton = function(def, preset, suffix, rotation)
+        return ninety_plus_boxen[suffix] or {}
+    end,
 }, advtrains.ap.t_90plusx_crossing)
 minetest.register_craft({
 	output = 'advtrains:dtrack_xing90plusx_placer 2',
@@ -101,6 +441,7 @@ minetest.register_craft({
 		{'', '', 'advtrains:dtrack_placer'}
 	}
 })
+
 -- Deprecate any rails using the old name scheme
 minetest.register_lbm({
 	label = "Upgrade legacy 4590 rails",
@@ -121,6 +462,83 @@ minetest.register_lbm({
 -- This will replace any items left in the inventory
 minetest.register_alias("advtrains:dtrack_xing4590_placer", "advtrains:dtrack_xing90plusx_placer")
 
+local diagonal_boxen = {
+    ["30r45l"] = {
+        selection_box = {
+            type = "fixed",
+            fixed = {
+                {0.5000, -0.5000, -1.000, -0.5000, -0.3750, 1.000},
+                {0.8750, -0.5000, -1.000, 0.5000, -0.3750, 0.2500},
+                {-0.5000, -0.5000, -0.2500, -0.8750, -0.3750, 1.000},
+                {0.1250, -0.5000, -1.375, -0.1875, -0.3750, -1.000}
+            }
+        }
+    },
+    ["60l30l"] = {
+        selection_box = {
+            type = "fixed",
+            fixed = {
+                {-1.000, -0.5000, -0.5000, 1.000, -0.3750, 0.5000},
+                {-1.000, -0.5000, -0.8750, 0.2500, -0.3750, -0.5000},
+                {-0.2500, -0.5000, 0.5000, 1.000, -0.3750, 0.8750},
+                {-1.375, -0.5000, -0.1250, -1.000, -0.3750, 0.1875}
+            }
+        }
+    },
+    ["60l60r"] = {
+        selection_box = {
+            type = "fixed",
+            fixed = {
+                {-1.000, -0.5000, -1.000, 1.000, -0.3750, 1.000}
+            }
+        }
+    },
+    ["60r30r"] = {
+        selection_box = {
+            type = "fixed",
+            fixed = {
+                {1.000, -0.5000, -0.5000, -1.000, -0.3750, 0.5000},
+                {1.000, -0.5000, -0.8750, -0.2500, -0.3750, -0.5000},
+                {0.2500, -0.5000, 0.5000, -1.000, -0.3750, 0.8750},
+                {1.375, -0.5000, -0.1250, 1.000, -0.3750, 0.1875}
+            }
+        }
+    },
+    ["30l45r"] = {
+        selection_box = {
+            type = "fixed",
+            fixed = {
+                {-0.5000, -0.5000, -1.000, 0.5000, -0.3750, 1.000},
+                {-0.8750, -0.5000, -1.000, -0.5000, -0.3750, 0.2500},
+                {0.5000, -0.5000, -0.2500, 0.8750, -0.3750, 1.000},
+                {-0.1250, -0.5000, -1.375, 0.1875, -0.3750, -1.000}
+            }
+        }
+    },
+    ["60l45r"] = {
+        selection_box = {
+            type = "fixed",
+            fixed = {
+                {-1.000, -0.5000, -0.5000, 1.000, -0.3750, 0.5000},
+                {-1.000, -0.5000, -0.8750, 0.2500, -0.3750, -0.5000},
+                {-0.2500, -0.5000, 0.5000, 1.000, -0.3750, 0.8750},
+                {-1.375, -0.5000, -0.1250, -1.000, -0.3750, 0.1875}
+            }
+        }
+    },
+    ["60r45l"] = {
+        selection_box = {
+            type = "fixed",
+            fixed = {
+                {1.000, -0.5000, -0.5000, -1.000, -0.3750, 0.5000},
+                {1.000, -0.5000, -0.8750, -0.2500, -0.3750, -0.5000},
+                {0.2500, -0.5000, 0.5000, -1.000, -0.3750, 0.8750},
+                {1.375, -0.5000, -0.1250, 1.000, -0.3750, 0.1875}
+            }
+        }
+    },
+}
+
 -- Diagonal
 -- This set of rail crossings is named based on the angle of each intersecting
 -- direction when facing east and param2=0. Rails with l/r swapped are mirror
@@ -133,6 +551,9 @@ advtrains.register_tracks("default", {
 	shared_texture="advtrains_dtrack_shared.png",
 	description=attrans("Diagonal Diamond Crossing Track"),
 	formats = {},
+    get_additional_definiton = function(def, preset, suffix, rotation)
+        return diagonal_boxen[suffix] or {}
+    end,
 }, advtrains.ap.t_diagonalcrossing)
 minetest.register_craft({
 	output = 'advtrains:dtrack_xingdiag_placer 2',
@@ -212,6 +633,35 @@ advtrains.register_tracks("default", {
 	--bumpers still use the old texture until the models are redone.
 	description=attrans("Bumper"),
 	formats={},
+	get_additional_definiton = function(def, preset, suffix, rotation)
+		-- 2024-11-25: Bumpers get the additional feature of being both a signal and a self-contained TCB, when interlocking is used.
+		if advtrains.interlocking then
+			return {
+				-- use the special callbacks for self_tcb (see tcb_ts_ui.lua)
+				can_dig = advtrains.interlocking.self_tcb_make_can_dig_callback(true),
+				after_dig_node = advtrains.interlocking.self_tcb_make_after_dig_callback(true),
+				after_place_node = advtrains.interlocking.self_tcb_make_after_place_callback(true, true),
+				on_rightclick = advtrains.interlocking.self_tcb_make_on_rightclick_callback(false, true),
+				advtrains = {
+					main_aspects = {
+						-- No main aspects, it always shows Stop.
+						-- But we need to define the table so that signal caplevel is 3
+					},
+					apply_aspect = function(pos, node, main_aspect, rem_aspect, rem_aspinfo)
+						-- is a no-op for bumpers, it always shows Stop
+					end,
+					get_aspect_info = function(pos, main_aspect)
+						-- it always shows Stop
+						return advtrains.interlocking.signal.ASPI_HALT
+					end,
+					distant_support = false, -- not a distant
+					route_role = "end", -- the end is nigh!
+				}
+			}
+		else
+			return {} -- no additional defs when interlocking is not used
+		end
+	end,
 }, advtrains.ap.t_30deg_straightonly)
 minetest.register_craft({
 	output = 'advtrains:dtrack_bumper_placer 2',
@@ -297,8 +747,45 @@ minetest.register_on_player_receive_fields(function(player, formname, fields)
 	end
 end)
 
+local function load_wagon(wagon_id, node_inv, node_fc, unload)
+	local inv_modified = false
+	local w_inv=minetest.get_inventory({type="detached", name="advtrains_wgn_"..wagon_id})
+	if w_inv and w_inv:get_list("box") then
+	
+		local wagon_data = advtrains.wagons[wagon_id]
+		local wagon_fc
+		if wagon_data.fc then
+			if not wagon_data.fcind then wagon_data.fcind = 1 end
+			wagon_fc = tostring(wagon_data.fc[wagon_data.fcind]) or ""
+		end
+		
+		if node_fc == "" or wagon_fc == node_fc then
+			if not unload then
+				for _, item in ipairs(node_inv:get_list("main")) do
+					if w_inv:get_list("box") and w_inv:room_for_item("box", item)  then
+						w_inv:add_item("box", item)
+						node_inv:remove_item("main", item)
+						if item.name ~= "" then inv_modified = true end
+					end
+				end
+			else
+				for _, item in ipairs(w_inv:get_list("box")) do
+					if node_inv:get_list("main") and node_inv:room_for_item("main", item)  then
+						w_inv:remove_item("box", item)
+						node_inv:add_item("main", item)
+						if item.name ~= "" then inv_modified = true end
+					end
+				end
+			end
+		end
+	end
+	return inv_modified
+end
 
-local function train_load(pos, train_id, unload)
+local function load_entire_train(pos, train_id, unload) -- flood load when not in an active area
+	if advtrains.is_node_loaded(pos) then -- leave the loading to the nodetimer if area is loaded
+		return 
+	end
 	local train=advtrains.trains[train_id]
 	local below = get_far_node({x=pos.x, y=pos.y-1, z=pos.z})
 	if not string.match(below.name, "chest") then
@@ -311,43 +798,60 @@ local function train_load(pos, train_id, unload)
 		--track section is disabled
 		return
 	end
-	
-	local inv = minetest.get_inventory({type="node", pos={x=pos.x, y=pos.y-1, z=pos.z}})
-	if inv and train.velocity < 2 then
-		for k, v in ipairs(train.trainparts) do
-			local i=minetest.get_inventory({type="detached", name="advtrains_wgn_"..v})
-			if i and i:get_list("box") then
-			
-				local wagon_data = advtrains.wagons[v]
-				local wagon_fc
-				if wagon_data.fc then
-					if not wagon_data.fcind then wagon_data.fcind = 1 end
-					wagon_fc = tostring(wagon_data.fc[wagon_data.fcind]) or ""
-				end
-				
-				if node_fc == "" or wagon_fc == node_fc then
-					if not unload then
-						for _, item in ipairs(inv:get_list("main")) do
-							if i:get_list("box") and i:room_for_item("box", item)  then
-								i:add_item("box", item)
-								inv:remove_item("main", item)
-							end
-						end
-					else
-						for _, item in ipairs(i:get_list("box")) do
-							if inv:get_list("main") and inv:room_for_item("main", item)  then
-								i:remove_item("box", item)
-								inv:add_item("main", item)
-							end
+	local node_inv = minetest.get_inventory({type="node", pos={x=pos.x, y=pos.y-1, z=pos.z}})
+	if node_inv and train.velocity <= 2 then
+		for _, wagon_id in ipairs(train.trainparts) do
+			load_wagon(wagon_id, node_inv, node_fc, unload)
+		end
+	end
+end
+
+local function load_wagon_on_timer(pos, unload) -- loading ramp when in an active area
+	if not advtrains.is_node_loaded(pos) then -- leave the loading for the flood load function. we're out of area
+		return true -- reset the nodetimer until the node is loaded again
+	end
+	local tid, tidx = advtrains.get_train_at_pos(pos)
+	if not tid or tid == "" then
+		return true
+	end -- no train to load.
+
+	local train = advtrains.trains[tid]
+	local below = get_far_node({x=pos.x, y=pos.y-1, z=pos.z})
+	if not string.match(below.name, "chest") then
+		atprint("this is not a chest! at "..minetest.pos_to_string(pos))
+		return true
+	end
+	local node_fc = minetest.get_meta(pos):get_string("fc") or ""
+	if node_fc == "#" then
+		--track section is disabled
+		return true
+	end
+	local node_inv = minetest.get_inventory({type="node", pos={x=pos.x, y=pos.y-1, z=pos.z}})
+	if node_inv and train.velocity <= 2 then
+		local _, wagon_id, wagon_data = advtrains.get_wagon_at_index(tid, tidx)
+		if wagon_id then
+			local inv_modified = load_wagon(wagon_id, node_inv, node_fc, unload)
+			if inv_modified then
+				if advtrains.wagon_prototypes[advtrains.get_wagon_prototype(wagon_data)].set_textures then
+					local wagon_object = advtrains.wagon_objects[wagon_id]
+					if wagon_object and wagon_data then
+						local ent = wagon_object:get_luaentity()
+						if ent and ent.set_textures then
+							ent:set_textures(wagon_data)
 						end
 					end
 				end
 			end
 		end
 	end
+	return true
 end
 
-
+local nodetimer_interval = minetest.settings:get("advtrains_loading_track_timer") or 1
+local function start_nodetimer(pos)
+	local timer = minetest.get_node_timer(pos)
+	timer:start(nodetimer_interval)
+end
 
 advtrains.register_tracks("default", {
 	nodename_prefix="advtrains:dtrack_unload",
@@ -366,9 +870,16 @@ advtrains.register_tracks("default", {
 			on_rightclick = function(pos, node, player)
 				show_fc_formspec(pos, player)
 			end,
+			after_place_node = function(pos)
+				advtrains.ndb.update(pos)
+				start_nodetimer(pos)
+			end,
+			on_timer = function(pos)
+				return load_wagon_on_timer(pos, true)
+			end,
 			advtrains = {
 				on_train_enter = function(pos, train_id)
-					train_load(pos, train_id, true)
+					load_entire_train(pos, train_id, true)
 				end,
 			},
 		}
@@ -391,9 +902,16 @@ advtrains.register_tracks("default", {
 			on_rightclick = function(pos, node, player)
 				show_fc_formspec(pos, player)
 			end,
+			after_place_node = function(pos)
+				advtrains.ndb.update(pos)
+				start_nodetimer(pos)
+			end,
+			on_timer = function(pos)
+				return load_wagon_on_timer(pos, false)
+			end,
 			advtrains = {
 				on_train_enter = function(pos, train_id)
-					train_load(pos, train_id, false)
+					load_entire_train(pos, train_id, false)
 				end,
 			},
 		}
@@ -407,7 +925,6 @@ if minetest.get_modpath("basic_materials") then
 elseif minetest.get_modpath("technic") then
 	loader_core = "technic:control_logic_unit"
 end
---print("Loader Core: "..loader_core)
 
 minetest.register_craft({
 	type="shapeless",
diff --git a/advtrains_train_track/mod.conf b/advtrains_train_track/mod.conf
index 2aece3e..a7fef4d 100644
--- a/advtrains_train_track/mod.conf
+++ b/advtrains_train_track/mod.conf
@@ -4,4 +4,4 @@ description=Default track set for Advanced Trains
 author=orwell96
 
 depends=advtrains
-optional_depends=mesecons,digtron
+optional_depends=mesecons,digtron,advtrains_interlocking
diff --git a/advtrains_train_track/settingtypes.txt b/advtrains_train_track/settingtypes.txt
new file mode 100644
index 0000000..0af0081
--- /dev/null
+++ b/advtrains_train_track/settingtypes.txt
@@ -0,0 +1,4 @@
+# Set the nodetimer delay for the loading tracks.
+# A longer delay may cause wagons to be missed if the pass over too fast.
+# A shorter delay may cause lag as wagons are checked multiple times as they pass over.
+advtrains_loading_track_timer (Loading Track Timer) int 1
\ No newline at end of file
diff --git a/assets/mm_trains_bvbg.png b/assets/mm_trains_bvbg.png
new file mode 100644
index 0000000..e1ac0ed
--- /dev/null
+++ b/assets/mm_trains_bvbg.png
diff --git a/assets/muc_ubahn_uvs.png b/assets/muc_ubahn_uvs.png
new file mode 100644
index 0000000..b4292af
--- /dev/null
+++ b/assets/muc_ubahn_uvs.png
diff --git a/assets/signal_wall.blend1 b/assets/signal_wall.blend1
new file mode 100644
index 0000000..7915a52
--- /dev/null
+++ b/assets/signal_wall.blend1
diff --git a/assets/signal_wall_ceiling_muc_ubahn.blend b/assets/signal_wall_ceiling_muc_ubahn.blend
new file mode 100644
index 0000000..b4d8e06
--- /dev/null
+++ b/assets/signal_wall_ceiling_muc_ubahn.blend
diff --git a/assets/signal_wall_muc_ubahn.blend b/assets/signal_wall_muc_ubahn.blend
new file mode 100644
index 0000000..6f40560
--- /dev/null
+++ b/assets/signal_wall_muc_ubahn.blend
diff --git a/make_release.sh b/make_release.sh
new file mode 100755
index 0000000..d6ae82a
--- /dev/null
+++ b/make_release.sh
@@ -0,0 +1,53 @@
+#!/bin/sh
+
+# get version argument
+VERS="$1"
+if [ ! "$VERS" ];then
+   echo "Argument version expected: example ./make_release.sh 2.5.0"
+   exit 1
+fi
+
+# cd to root dir
+cd "$(dirname "$0")"
+AROOT="$(pwd)"
+echo "Working directory is: $AROOT"
+# create temp directory
+TMP=$(mktemp -d -t advtrains-XXXX)
+echo "Temp directory is: $TMP"
+mkdir "$TMP/advtrains"
+TDIR="$TMP/advtrains/"
+
+# copy dirs
+cp -r "advtrains" "$TDIR"
+cp -r "advtrains_interlocking" "$TDIR"
+cp -r "advtrains_line_automation" "$TDIR"
+cp -r "advtrains_luaautomation" "$TDIR"
+cp -r "advtrains_signals_ks" "$TDIR"
+cp -r "advtrains_signals_japan" "$TDIR"
+cp -r "advtrains_signals_muc_ubahn" "$TDIR"
+cp -r "advtrains_train_track" "$TDIR"
+cp -r "serialize_lib" "$TDIR"
+
+# copy files
+cp "atc_command.txt" "$TDIR"
+cp "description.txt" "$TDIR"
+cp "license.txt" "$TDIR"
+cp "license_media.txt" "$TDIR"
+cp "modpack.conf" "$TDIR"
+cp "privilege_guide.txt" "$TDIR"
+cp "README.md" "$TDIR"
+cp "screenshot.png" "$TDIR"
+
+# compress to zip archive
+ZIPNAME="$AROOT/advtrains_$VERS.zip"
+echo "Target ZIP file is: $ZIPNAME"
+cd "$TMP"
+zip -r "$ZIPNAME" "advtrains"
+cd "$AROOT"
+
+# success
+echo "Release $VERS created at: $ZIPNAME"
+
+# remove tempdir
+rm -rf "$TMP"
+
diff --git a/modpack.conf b/modpack.conf
index e01f462..5185be4 100644
--- a/modpack.conf
+++ b/modpack.conf
@@ -2,3 +2,4 @@ name=advtrains
 title=Advanced Trains
 description=Realistic trains and various equipment for railways, with a focus on automated train operation. No trains included, please install those separately.
 author=orwell96
+min_minetest_version=5.4
\ No newline at end of file