Merge commit '5aad0930d1ddd63d9021d833a9379b4a01bd8414' as 'advtrains'

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diff --git a/advtrains/.gitignore b/advtrains/.gitignore
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+## Eclipse project files & directories
+.project
+.settings
diff --git a/advtrains/advtrains/api_doc.txt b/advtrains/advtrains/api_doc.txt
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+Advanced Trains [advtrains] API documentation
+--------
+To use the API, mods must depend on 'advtrains'.
+All boolean values in definition tables default to 'false' and can be omitted.
+### Wagons
+Wagons are registered using the function
+
+advtrains.register_wagon(name, prototype, description, inventory_image)
+- 'name' is the internal name of the wagon. It should follow the mod naming convention, however, this is not enforced.
+	For compatibility reasons, if a mod name is omitted, the wagon will be registered in the advtrains: namespace.
+	Example: A wagon with name="engine_tgv" will be registered as "advtrains:engine_tgv".
+	!IMPORTANT! You must not append a ":" at the start of the name, even if you want to bypass the mod naming convention check. This is because internally the register_wagon function
+	appends a ":" automatically.
+- 'prototype' is the lua entity prototype. The regular definition keys for luaentites apply. Additional required and optional properties see below. DO NOT define 'on_step', 'on_activate', 'on_punch', 'on_rightclick' and 'get_staticdata' since these will be overridden. Use 'custom_*' instead.
+- 'description' is the description of the inventory item that is used to place the wagon.
+- 'inventory_image' is the inventory image of said item.
+
+# 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 = {
+	^- contains zero or more seat definitions. A seat is a place where a player can be attached when getting on a wagon.
+		{
+			name="Left front window",
+			^- display name of this seat
+			attach_offset={x=0, y=10, z=0},
+			^- this value is passed to 'set_attach'
+			view_offset={x=0, y=6, z=0},
+			^- player:set_eye_offset is called with this parameter.
+			group="default"
+			^- optional. Defines the seat group. See 'seat_groups' below
+			-!- Note: driving_ctrl_access field has moved to seat group definition,
+			-!- but is still partwise supported here. If you don't use seat groups yet,
+			-!- you really should change NOW!
+		},
+	},
+	seat_groups = {
+	^- If defined, activates advanced seating behavior. See "seating behavior".
+		default = {
+			name = "Seats"
+			^- name of this seat group, to be shown in get-on menu.
+			access_to = {"foo", "bar"}
+			^- List of seat groups you can access from this seat using the menu when sitting inside the train.
+			require_doors_open = true
+			^- Only allow getting on and off if doors are open.
+			driving_ctrl_access=false,
+			^- If the seat is a driver stand, and players sitting here should get access to the train's driving control.
+		}
+	}
+	assign_to_seat_group = {"default"},
+	^- optional, like seat_groups. When player right_clicks the wagon, player will be assigned to the first free seat group in the list.
+	
+	doors={
+	^- optional. If defined, defines door animation frames. Opposite door has to be closed during animation period.
+	^- Remember, advtrains can't handle doors on both sides opened simultaneously.
+		open={
+			[-1]={frames={x=0, y=20}, time=1}, -- open left doors
+			[1]={frames={x=40, y=60}, time=1}  -- open right doors
+			sound = <simpleSoundSpec>
+			^- The sound file of the doors opening. If none is specified, nothing is played.
+		},
+		close={
+			[-1]={frames={x=20, y=40}, time=1}, -- close left doors
+			[1]={frames={x=60, y=80}, time=1} -- close right doors
+			sound = <simpleSoundSpec>
+			^- The sound file of the doors closing. If none is specified, nothing is played.
+		}
+	},
+	door_entry={ 1.5, -1.5 }
+	^- optional. If defined, defines the locations of the doors on the model as distance from the object center on the path.
+	^- Getting on by walking in then takes effect.
+	^- Positive values mean front, negative ones back. Resulting position is automatically shifted to the right side.
+
+	wagon_span=2,
+	^- How far this wagon extends from its base position. Is the half of the wagon length.
+	^- Used to determine in which distance the other wagons have to be positioned. Will require tweaking.
+	extent_h = 1,
+	^- Determines the collision box extent in x/z direction. Defaults to 1 (=3x3)
+	^- The actual bounding box size is (extent_h*2)+1, so 0 means 1x1, 1 means 3x3 and 2 means 5x5
+	extent_v = 2,
+	^- Determines the collision box extent in y direction. Defaults to 2 (=3).
+	^- The actual bounding box size is extent_v+1, so 0 means 1, 1 means 2, 2 means 3 a.s.o.
+	horn_sound = <simpleSoundSpec>,
+	^- The sound file of the horn. If none is specified, this wagon can't sound a horn. The specified sound file will be looped.
+	
+	drops = {"default:steelblock 3"}
+	^- List of itemstrings what to drop when the wagon is destroyed
+	
+	has_inventory = false
+	^- If this wagon has an inventory. The inventory is saved with the wagon.
+	^- the following settings are ignored if not.
+	inventory_list_sizes = {
+		box=8*6,
+	},
+	^- List of assignments of type list_name=size.
+	^- For every entry, an inventory list is created with the specified size.
+	get_inventory_formspec = function(self, player_name, inventory_name)
+		return "<a formspec>"
+	end,
+	^- Function that should return the formspec to be displayed when <player> requests to open the wagon's inventory.
+	^- advtrains.standard_inventory_formspec can be used for ordinary wagons with inventories to show
+	^- both the inventory grid and a 'Wagon properties' button.
+	^- Use "list["..inventory_name..";<list_name>;<X>,<Y>;<W>,<H>;<Start>]" to display a wagon's inventory list.
+
+	custom_on_step = function(self, dtime) end
+	^- optional: Execute custom code on every step
+	custom_on_activate = function(self, dtime_s) end
+	^- optional: Execute custom code on activate. Staticdata does not need to be saved and restored since all properties written in 'self' are preserved over unloads.
+	custom_on_velocity_change = function(self, velocity, old_velocity) end
+	^- optional: Function that is called whenever the train's velocity changes or every 2 seconds. Used to call 'self.object:update_animation()' if needed.
+	^- for compatibility reasons the name 'update_animation' for this function is still supported. 
+
+}
+
+# Notes on wagons
+
+- Every wagon has the field 'id' which assigns each wagon a random id.
+- Properties written in the Lua Entity (self) are discarded when the wagon entity is unloaded. At the moment there is no way to store data inside a wagon persistently.
+- Assuming Z Axis as the axis parallel to the tracks and Y Axis as the one pointing into the sky, wagon models should be dimensioned in a way that:
+	- their origin is centered in X and Z direction
+	- their origin lies 0.5 units above the bottom of the model
+	- the overall extent in X and Y direction is <=3 units
+- wagon_span is then the distance between the model origin and the Z axis extent.
+
+# Seating behavior
+If the advanced seating behavior is active, clicking on a wagon will immediately get you on that wagon depending on the entries in assign_to_seat_group.
+If all seat groups are full, if the doors are closed or if you are not authorized to enter this seat group(e.g. driver stands), will show a warning.
+On a train, right-clicking the wagon will make you get off the train unless:
+- the doors are closed and it requires open doors.
+- you have access to a seat group specified in access_to (you may enter it and it's not full)
+- you are the owner and can access the wagon preferences
+In case there's no possibility, does nothing.
+In case there are multiple possibilities, will show a form.
+
+If you can't enter or leave a train because the doors are closed, holding the Sneak key while right-clicking bypasses the "doors have to be open" enforcement.
+
+### Tracks
+Most modders will be satisfied with the built-in tracks. If cog railways, maglev trains and mine trains are added, it is necessary to understand the definition of tracks. Although the tracks API is there, explaining it would require more effort than me creating the wanted definitions myself. Contact me if you need to register your own rails using my registration functions.
+
+However, it is still possible to register single rails by understanding the node properties of rails.
+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.
+	},
+	
+	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 can be up to 4 connections.
+	   2 connections are a normal rail, 3 connections a turnout (1->2 and 2/3->1) and 4 connections a crossing (1<>2 and 3<>4)
+	   c is the direction of the connection (0-16) and y is the height of the connection (rail will only connect when this matches)
+
+	can_dig=function(pos)
+		return not advtrains.get_train_at_pos(pos)
+	end,
+	after_dig_node=function(pos)
+		advtrains.ndb.update(pos)
+	end,
+	after_place_node=function(pos)
+		advtrains.ndb.update(pos)
+	end,
+	^- the code in these 3 default minetest API functions is required for advtrains to work, however you can add your own code
+	
+	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, 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.
+		^- lzbdata should be ignored and nothing should be assigned to it
+	}
+})
diff --git a/advtrains/advtrains/atc.lua b/advtrains/advtrains/atc.lua
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+++ b/advtrains/advtrains/atc.lua
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+--atc.lua
+--registers and controls the ATC system
+
+local atc={}
+
+local eval_conditional
+
+-- ATC persistence table. advtrains.atc is created by init.lua when it loads the save file.
+atc.controllers = {}
+function atc.load_data(data)
+	local temp = data and data.controllers or {}
+	--transcode atc controller data to node hashes: table access times for numbers are far less than for strings
+	for pts, data in pairs(temp) do
+		if type(pts)=="number" then
+			pts=minetest.pos_to_string(minetest.get_position_from_hash(pts))
+		end
+		atc.controllers[pts] = data
+	end
+end
+function atc.save_data()
+	return {controllers = atc.controllers}
+end
+--contents: {command="...", arrowconn=0-15 where arrow points}
+
+--general
+function atc.train_set_command(train, command, arrow)
+	atc.train_reset_command(train, true)
+	train.atc_delay = 0
+	train.atc_arrow = arrow
+	train.atc_command = command
+end
+
+function atc.send_command(pos, par_tid)
+	local pts=minetest.pos_to_string(pos)
+	if atc.controllers[pts] then
+		--atprint("Called send_command at "..pts)
+		local train_id = par_tid or advtrains.get_train_at_pos(pos)
+		if train_id then
+			if advtrains.trains[train_id] then
+				--atprint("send_command inside if: "..sid(train_id))
+				if atc.controllers[pts].arrowconn then
+					atlog("ATC controller at",pts,": This controller had an arrowconn of", atc.controllers[pts].arrowconn, "set. Since this field is now deprecated, it was removed.")
+					atc.controllers[pts].arrowconn = nil
+				end
+				
+				local train = advtrains.trains[train_id]
+				local index = advtrains.path_lookup(train, pos)
+				
+				local iconnid = 1
+				if index then
+					iconnid = train.path_cn[index]
+				else
+					atwarn("ATC rail at", pos, ": Rail not on train's path! Can't determine arrow direction. Assuming +!")
+				end
+				
+				local command = atc.controllers[pts].command				
+				command = eval_conditional(command, iconnid==1, train.velocity)
+				if not command then command="" end
+				command=string.match(command, "^%s*(.*)$")
+				
+				if command == "" then
+					atprint("Sending ATC Command to", train_id, ": Not modifying, conditional evaluated empty.")
+					return true
+				end
+				
+				atc.train_set_command(train, command, iconnid==1)
+				atprint("Sending ATC Command to", train_id, ":", command, "iconnid=",iconnid)
+				return true
+				
+			else
+				atwarn("ATC rail at", pos, ": Sending command failed: The train",train_id,"does not exist. This seems to be a bug.")
+			end
+		else
+			atwarn("ATC rail at", pos, ": Sending command failed: There's no train at this position. This seems to be a bug.")
+		end
+	else
+		atwarn("ATC rail at", pos, ": Sending command failed: Entry for controller not found.")
+		atwarn("ATC rail at", pos, ": Please visit controller and click 'Save'")
+	end
+	return false
+end
+
+-- Resets any ATC commands the train is currently executing, including the target speed (tarvelocity) it is instructed to hold
+-- if keep_tarvel is set, does not clear the tarvelocity
+function atc.train_reset_command(train, keep_tarvel)
+	train.atc_command=nil
+	train.atc_delay=nil
+	train.atc_brake_target=nil
+	train.atc_wait_finish=nil
+	train.atc_arrow=nil
+	if not keep_tarvel then
+		train.tarvelocity=nil
+	end
+end
+
+--nodes
+local idxtrans={static=1, mesecon=2, digiline=3}
+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
+
+advtrains.atc_function = function(def, preset, suffix, rotation)
+		return {
+			after_place_node=apn_func,
+			after_dig_node=function(pos)
+				return advtrains.pcall(function()
+					advtrains.invalidate_all_paths(pos)
+					advtrains.ndb.clear(pos)
+					local pts=minetest.pos_to_string(pos)
+					atc.controllers[pts]=nil
+				end)
+			end,
+			on_receive_fields = function(pos, formname, fields, player)
+				return advtrains.pcall(function()
+					if advtrains.is_protected(pos, player:get_player_name()) then
+						minetest.record_protection_violation(pos, player:get_player_name())
+						return
+					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 or "?"), meta:get_string("command")) )
+								else
+									meta:set_string("infotext", attrans("ATC controller, mode @1\nCommand: @2", (fields.mode or "?"), meta:get_string("command")) )
+								end
+								meta:set_string("formspec", atc.get_atc_controller_formspec(pos, meta))
+							end
+							return
+						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 or "?"), meta:get_string("command")) )
+						else
+							meta:set_string("infotext", attrans("ATC controller, mode @1\nCommand: @2", (fields.mode or "?"), 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
+					end
+				end)
+			end,
+			advtrains = {
+				on_train_enter = function(pos, train_id)
+					atc.send_command(pos)
+				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.."field[0.5,1.5;7,1;command;"..attrans("Command")..";"..minetest.formspec_escape(command).."]"
+		if tonumber(mode)==2 then
+			formspec=formspec.."field[0.5,3;7,1;command_on;"..attrans("Command (on)")..";"..minetest.formspec_escape(command_on).."]"
+		end
+	else
+		formspec=formspec.."field[0.5,1.5;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)
+		train.tarvelocity=train.max_speed
+		return 2
+	end,
+	["S([0-9]+)"]=function(id, train, match)
+		train.tarvelocity=tonumber(match)
+		return #match+1
+	end,
+	["B([0-9]+)"]=function(id, train, match)
+		if train.velocity>tonumber(match) then
+			train.atc_brake_target=tonumber(match)
+			if not train.tarvelocity or train.tarvelocity>train.atc_brake_target then
+				train.tarvelocity=train.atc_brake_target
+			end
+		end
+		return #match+1
+	end,
+	["BB"]=function(id, train)
+		train.atc_brake_target = -1
+		train.tarvelocity = 0
+		return 2
+	end,
+	["W"]=function(id, train)
+		train.atc_wait_finish=true
+		return 1
+	end,
+	["D([0-9]+)"]=function(id, train, match)
+		train.atc_delay=tonumber(match)
+		return #match+1
+	end,
+	["R"]=function(id, train)
+		if train.velocity<=0 then
+			advtrains.invert_train(id)
+			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!"))
+		end
+		return 1
+	end,
+	["O([LRC])"]=function(id, train, match)
+		local tt={L=-1, R=1, C=0}
+		local arr=train.atc_arrow and 1 or -1
+		train.door_open = tt[match]*arr
+		return 2
+	end,
+}
+
+eval_conditional = function(command, arrow, speed)
+	--conditional statement?
+	local is_cond, cond_applies, compare
+	local cond, rest=string.match(command, "^I([%+%-])(.+)$")
+	if cond then
+		is_cond=true
+		if cond=="+" then
+			cond_applies=arrow
+		end
+		if cond=="-" then
+			cond_applies=not arrow
+		end
+	else 
+		cond, compare, rest=string.match(command, "^I([<>]=?)([0-9]+)(.+)$")
+		if cond and compare then
+			is_cond=true
+			if cond=="<" then
+				cond_applies=speed<tonumber(compare)
+			end
+			if cond==">" then
+				cond_applies=speed>tonumber(compare)
+			end
+			if cond=="<=" then
+				cond_applies=speed<=tonumber(compare)
+			end
+			if cond==">=" then
+				cond_applies=speed>=tonumber(compare)
+			end
+		end
+	end	
+	if is_cond then
+		atprint("Evaluating if statement: "..command)
+		atprint("Cond: "..(cond or "nil"))
+		atprint("Applies: "..(cond_applies and "true" or "false"))
+		atprint("Rest: "..rest)
+		--find end of conditional statement
+		local nest, pos, elsepos=0, 1
+		while nest>=0 do
+			if pos>#rest then
+				atwarn(sid(id), attrans("ATC command syntax error: I statement not closed: @1",command))
+				return ""
+			end
+			local char=string.sub(rest, pos, pos)
+			if char=="I" then
+				nest=nest+1
+			end
+			if char==";" then
+				nest=nest-1
+			end
+			if nest==0 and char=="E" then
+				elsepos=pos+0
+			end
+			pos=pos+1
+		end
+		if not elsepos then elsepos=pos-1 end
+		if cond_applies then
+			command=string.sub(rest, 1, elsepos-1)..string.sub(rest, pos)
+		else
+			command=string.sub(rest, elsepos+1, pos-2)..string.sub(rest, pos)
+		end
+		atprint("Result: "..command)
+	end
+	return command
+end
+
+function atc.execute_atc_command(id, train)
+	--strip whitespaces
+	local command=string.match(train.atc_command, "^%s*(.*)$")
+	
+	
+	if string.match(command, "^%s*$") then
+		train.atc_command=nil
+		return
+	end
+
+	train.atc_command = eval_conditional(command, train.atc_arrow, train.velocity)
+	
+	if not train.atc_command then return end
+	command=string.match(train.atc_command, "^%s*(.*)$")
+	
+	if string.match(command, "^%s*$") then
+		train.atc_command=nil
+		return
+	end
+	
+	for pattern, func in pairs(matchptn) do
+		local match=string.match(command, "^"..pattern)
+		if match then
+			local patlen=func(id, train, match)
+			
+			atprint("Executing: "..string.sub(command, 1, patlen))
+			
+			train.atc_command=string.sub(command, patlen+1)
+			if train.atc_delay<=0 and not train.atc_wait_finish then
+				--continue (recursive, cmds shouldn't get too long, and it's a end-recursion.)
+				atc.execute_atc_command(id, train)
+			end
+			return
+		end
+	end
+	atwarn(sid(id), attrans("ATC command parse error: Unknown command: @1", command))
+	atc.train_reset_command(train, true)
+end
+
+
+
+--move table to desired place
+advtrains.atc=atc
diff --git a/advtrains/advtrains/copytool.lua b/advtrains/advtrains/copytool.lua
new file mode 100644
index 0000000..dc18081
--- /dev/null
+++ b/advtrains/advtrains/copytool.lua
@@ -0,0 +1,185 @@
+--clipboard = {trainlen = number, [n] = {type = string, flipped = bool, }
+
+-- Yaw is in radians. There are 2pi rad in a circle. North is the 0 point and the angle increases anticlockwise.
+-- 4.712389 = 1.5pi; sin(1.5pi) = -1
+-- 7.853981 = 2.5pi; sin(2.5pi) = 1
+
+minetest.register_tool("advtrains:copytool", {
+	description = attrans("Train copy/paste tool\n\nLeft-click: copy train\nRight-click: paste train"),
+	inventory_image = "advtrains_copytool.png",
+	wield_image = "advtrains_copytool.png",
+	stack_max = 1,
+	-- Paste: Take the clipboard and the player yaw, and attempt to place a new train in the world.
+	-- The front of the train is used as the start of the new train and it proceeds backwards from
+	-- the direction of travel.
+	on_place = function(itemstack, placer, pointed_thing)
+			return advtrains.pcall(function()
+				if ((not pointed_thing.type == "node") or (not placer.get_player_name)) then
+					return
+				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
+				local nodename=node.name
+				if(not advtrains.is_track_and_drives_on(nodename, {default=true})) 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.")
+					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
+					return itemstack
+				end
+				local tconns=advtrains.get_track_connections(node.name, node.param2)
+				local yaw = placer:get_look_horizontal()
+				local plconnid = advtrains.yawToClosestConn(yaw, tconns)
+
+				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!")
+					return
+				end
+
+				local meta = itemstack:get_meta()
+				if not meta then
+					minetest.chat_send_player(pname, attrans("The clipboard couldn't access the metadata. Paste failed."))
+				return
+				end
+				local clipboard = meta:get_string("clipboard")
+				if (clipboard == "") then
+					minetest.chat_send_player(pname, "The clipboard is empty.");
+					return
+				end
+				clipboard = minetest.deserialize(clipboard)
+				if (clipboard.wagons == nil) then
+					minetest.chat_send_player(pname, "The clipboard is empty.");
+					return
+				end
+
+				local wagons = {}
+				local n = 1
+				for _, wagonProto in pairs(clipboard.wagons) do
+					local wagon = advtrains.create_wagon(wagonProto.type, pname)
+					advtrains.wagons[wagon].wagon_flipped = wagonProto.wagon_flipped
+					wagons[n] = wagon
+					n = n + 1
+				end
+
+				local id=advtrains.create_new_train_at(pointed_thing.under, plconnid, 0, wagons)
+				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.")
+					advtrains.remove_train(id)
+					return
+				end
+				train.text_outside = clipboard.text_outside
+				train.text_inside = clipboard.text_inside
+				train.routingcode = clipboard.routingcode
+				train.line = clipboard.line
+
+				return
+			end)
+		end,
+	-- Copy: Take the pointed-at train and put it on the clipboard
+	on_use = function(itemstack, user, pointed_thing)
+		if not user:get_player_name() then return end
+		if (pointed_thing.type ~= "object") then return end
+
+		local le = pointed_thing.ref:get_luaentity()
+		if (le == nil) then
+			minetest.chat_send_player(user:get_player_name(), "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))
+			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))
+			return
+		end
+
+		-- Record the train length. The paste operation should require this much free space.
+		local clipboard = {
+			trainlen = math.ceil(train.trainlen),
+			text_outside = train.text_outside,
+			text_inside = train.text_inside,
+			routingcode = train.routingcode,
+			line = train.line,
+			wagons = {}
+		}
+		local trainLength = math.ceil(train.trainlen)
+
+		local n = 1
+		for _, wagonid in pairs(train.trainparts) do
+			local wagon = advtrains.wagons[wagonid]
+			clipboard.wagons[n] = {
+				wagon_flipped = wagon.wagon_flipped,
+				type = wagon.type
+			}
+			n = n + 1
+		end
+		
+
+		local function flip_clipboard(wagon_clipboard)
+			local flipped = {}
+			local numWagons = #wagon_clipboard
+			for k, v in ipairs(wagon_clipboard) do
+				local otherSide = (numWagons-k)+1
+				flipped[otherSide] = v
+				local wagon = flipped[otherSide]
+				wagon.wagon_flipped = not wagon.wagon_flipped
+			end
+			return flipped
+		end
+
+		local function is_loco(wagon_id)
+			local wagon = advtrains.wagons[wagon_id]
+			if (not wagon) then return false end
+			local wagon_proto = advtrains.wagon_prototypes[wagon.type or wagon.entity_name]
+			if wagon_proto and wagon_proto.is_locomotive then
+				return true
+			end
+			return false
+		end
+
+		-- Decide on a new 'front of train' and possibly flip the train.
+		-- Locomotive on one end = loco-hauled, that end is front;
+		-- if (advtrains.wagons[train.trainparts[1]].is_locomotive) then -- do nothing, train is already in right order
+		local numWagons = #train.trainparts
+		local backLoco = train.trainparts[numWagons]
+		backLoco = is_loco(backLoco)
+		local frontLoco = train.trainparts[1]
+		frontLoco = is_loco(frontLoco)
+		if ((backLoco) and (not frontLoco)) then
+			clipboard.wagons = flip_clipboard(clipboard.wagons)
+			--minetest.chat_send_player(user:get_player_name(), "Flipped train: Loco-hauled")
+		end
+		-- locomotives on both ends = train is push-pull / multi-unit, has no front, do nothing
+		-- no locomotives on ends = rake of wagons, front is end closest to where player copied.
+		if ((not frontLoco) and (not backLoco)) then
+
+			if (wagon.pos_in_trainparts / numWagons > 0.5) then -- towards the end of the rain
+				clipboard.wagons = flip_clipboard(clipboard.wagons)
+				--minetest.chat_send_player(user:get_player_name(), "Flipped train: Rake")
+			end
+		end
+		
+		local meta = itemstack:get_meta()
+		if not meta then
+			minetest.chat_send_player(pname, attrans("The clipboard couldn't access the metadata. Copy failed."))
+			return
+		end
+		meta:set_string("clipboard", minetest.serialize(clipboard))
+		minetest.chat_send_player(user:get_player_name(), attrans("Train copied!"))
+		return itemstack
+	end
+})
+\ No newline at end of file
diff --git a/advtrains/advtrains/couple.lua b/advtrains/advtrains/couple.lua
new file mode 100644
index 0000000..1b213c2
--- /dev/null
+++ b/advtrains/advtrains/couple.lua
@@ -0,0 +1,192 @@
+--couple.lua
+--defines couple entities.
+
+--advtrains:discouple
+--set into existing trains to split them when punched.
+--they are attached to the wagons.
+--[[fields
+wagon
+
+wagons keep their couple entity minetest-internal id inside the field discouple_id. if it refers to nowhere, they will spawn a new one if player is near
+]]
+
+local couple_max_dist=3
+
+minetest.register_entity("advtrains:discouple", {
+	visual="sprite",
+	textures = {"advtrains_discouple.png"},
+	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},
+	
+	is_discouple=true,
+	static_save = false,
+	on_activate=function(self, staticdata) 
+		if staticdata=="DISCOUPLE" then
+			--couple entities have no right to exist further...
+			atprint("Discouple loaded from staticdata, destroying")
+			self.object:remove()
+			return
+		end
+		self.object:set_armor_groups({immortal=1})
+	end,
+	get_staticdata=function() return "DISCOUPLE" end,
+	on_punch=function(self, player)
+		return advtrains.pcall(function()
+			local pname = player:get_player_name()
+			if pname and pname~="" and self.wagon then
+				if advtrains.safe_decouple_wagon(self.wagon.id, pname) then
+					self.object:remove()
+				else
+					minetest.add_entity(self.object:getpos(), "advtrains:lockmarker")
+				end
+			end
+		end)
+	end,
+	on_step=function(self, dtime)
+		return advtrains.pcall(function()
+			if not self.wagon then
+				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.
+			if not self.wagon.object:getyaw() then
+				self.object:remove()
+				return
+			end
+			if not self.wagon:train() or self.wagon:train().velocity > 0 then
+				self.object:remove()
+				return
+			end
+		end)
+	end,
+})
+
+-- advtrains:couple
+-- Couple entity 
+local function lockmarker(obj)
+	minetest.add_entity(obj:get_pos(), "advtrains:lockmarker")
+	obj:remove()
+end
+
+minetest.register_entity("advtrains:couple", {
+	visual="sprite",
+	textures = {"advtrains_couple.png"},
+	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},
+	
+	is_couple=true,
+	static_save = false,
+	on_activate=function(self, staticdata)
+		return advtrains.pcall(function()
+			if staticdata=="COUPLE" then
+				--couple entities have no right to exist further...
+				atprint("Couple loaded from staticdata, destroying")
+				self.object:remove()
+				return
+			end
+			self.object:set_armor_groups({immmortal=1})
+		end)
+	end,
+	get_staticdata=function(self) return "COUPLE" end,
+	on_rightclick=function(self, clicker)
+		return advtrains.pcall(function()
+			if not self.train_id_1 or not self.train_id_2 then return end
+			
+			local pname=clicker
+			if type(clicker)~="string" then pname=clicker:get_player_name() end
+			
+			if advtrains.safe_couple_trains(self.train_id_1, self.train_id_2, self.t1_is_front, self.t2_is_front, pname) then
+				self.object:remove()
+			else
+				lockmarker(self.object)
+			end
+		end)
+	end,
+	on_step=function(self, dtime)
+		return advtrains.pcall(function()
+			advtrains.atprint_context_tid=self.train_id_1
+
+			if not self.train_id_1 or not self.train_id_2 then atprint("Couple: train ids not set!") self.object:remove() return end
+			local train1=advtrains.trains[self.train_id_1]
+			local train2=advtrains.trains[self.train_id_2]
+			if not train1 or not train2 then
+				atprint("Couple: trains missing, destroying")
+				self.object:remove()
+				return
+			end
+			
+			--shh, silence here, this is an on-step callback!
+			if not advtrains.train_ensure_init(self.train_id_1, train1) then
+				--atwarn("Train",self.train_id_1,"is not initialized! Operation aborted!")
+				return
+			end
+			if not advtrains.train_ensure_init(self.train_id_2, train2) then
+				--atwarn("Train",self.train_id_2,"is not initialized! Operation aborted!")
+				return
+			end
+			
+			if train1.velocity>0 or train2.velocity>0 then
+				if not self.position_set then --ensures that train stands a single time before check fires. Using flag below
+					return
+				end
+				atprint("Couple: train is moving, destroying")
+				self.object:remove()
+				return
+			end
+			
+			if not self.position_set then
+				local tp1
+				if self.t1_is_front then
+					tp1=advtrains.path_get_interpolated(train1, train1.index)
+				else
+					tp1=advtrains.path_get_interpolated(train1, train1.end_index)
+				end
+				local tp2
+				if self.t2_is_front then
+					tp2=advtrains.path_get_interpolated(train2, train2.index)
+				else
+					tp2=advtrains.path_get_interpolated(train2, train2.end_index)
+				end
+				local pos_median=advtrains.pos_median(tp1, tp2)
+				if not vector.equals(pos_median, self.object:getpos()) then
+					self.object:setpos(pos_median)
+				end
+				self.position_set=true
+			end
+			atprintbm("couple step", t)
+			advtrains.atprint_context_tid=nil
+
+		end)
+	end,
+})
+minetest.register_entity("advtrains:lockmarker", {
+	visual="sprite",
+	textures = {"advtrains_cpl_lock.png"},
+	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},
+	
+	is_lockmarker=true,
+	static_save = false,
+	on_activate=function(self, staticdata)
+		return advtrains.pcall(function()
+			if staticdata=="COUPLE" then
+				--couple entities have no right to exist further...
+				atprint("Couple loaded from staticdata, destroying")
+				self.object:remove()
+				return
+			end
+			self.object:set_armor_groups({immmortal=1})
+			self.life=5
+		end)
+	end,
+	get_staticdata=function(self) return "COUPLE" end,
+	on_step=function(self, dtime)
+		self.life=(self.life or 5)-dtime
+		if self.life<0 then
+			self.object:remove()
+		end
+	end,
+}) 
diff --git a/advtrains/advtrains/craft_items.lua b/advtrains/advtrains/craft_items.lua
new file mode 100644
index 0000000..0e693eb
--- /dev/null
+++ b/advtrains/advtrains/craft_items.lua
@@ -0,0 +1,23 @@
+ 
+core.register_craftitem("advtrains:boiler", {
+	description = attrans("Boiler"),
+	inventory_image = "advtrains_boiler.png",
+})
+
+ 
+core.register_craftitem("advtrains:driver_cab", {
+	description = attrans("driver's cab"),
+	inventory_image = "advtrains_driver_cab.png",
+})
+
+ 
+core.register_craftitem("advtrains:wheel", {
+	description = attrans("Wheel"),
+	inventory_image = "advtrains_wheel.png",
+})
+
+
+core.register_craftitem("advtrains:chimney", {
+	description = attrans("Chimney"),
+	inventory_image = "advtrains_chimney.png",
+})
diff --git a/advtrains/advtrains/crafting.lua b/advtrains/advtrains/crafting.lua
new file mode 100644
index 0000000..cb0813c
--- /dev/null
+++ b/advtrains/advtrains/crafting.lua
@@ -0,0 +1,76 @@
+--advtrains by orwell96, see readme.txt and license.txt
+--crafting.lua
+--registers crafting recipes
+
+--tracks: see advtrains_train_track
+--signals
+minetest.register_craft({
+	output = 'advtrains:retrosignal_off 2',
+	recipe = {
+		{'dye:red', 'default:steel_ingot', 'default:steel_ingot'},
+		{'', '', 'default:steel_ingot'},
+		{'', '', 'default:steel_ingot'},
+	},
+})
+minetest.register_craft({
+	output = 'advtrains:signal_off 2',
+	recipe = {
+		{'', 'dye:red', 'default:steel_ingot'},
+		{'', 'dye:dark_green', 'default:steel_ingot'},
+		{'', '', 'default:steel_ingot'},
+	},
+})
+
+--trackworker
+minetest.register_craft({
+	output = 'advtrains:trackworker',
+	recipe = {
+		{'default:diamond'},
+		{'screwdriver:screwdriver'},
+		{'default:steel_ingot'},
+	},
+})
+
+--boiler
+minetest.register_craft({
+	output = 'advtrains:boiler',
+	recipe = {
+		{'default:steel_ingot', 'default:steel_ingot', 'default:steel_ingot'},
+		{'doors:trapdoor_steel', '', 'default:steel_ingot'},
+		{'default:steel_ingot', 'default:steel_ingot', 'default:steel_ingot'},
+	},
+})
+
+--drivers'cab
+minetest.register_craft({
+	output = 'advtrains:driver_cab',
+	recipe = {
+		{'default:steel_ingot', 'default:steel_ingot', 'default:steel_ingot'},
+		{'', '', 'default:glass'},
+		{'default:steel_ingot', 'default:steel_ingot', 'default:steel_ingot'},
+	},
+})
+
+--drivers'cab
+minetest.register_craft({
+	output = 'advtrains:wheel',
+	recipe = {
+		{'', 'default:steel_ingot', ''},
+		{'default:steel_ingot', 'group:stick', 'default:steel_ingot'},
+		{'', 'default:steel_ingot', ''},
+	},
+})
+
+--chimney
+minetest.register_craft({
+	output = 'advtrains:chimney',
+	recipe = {
+		{'', 'default:steel_ingot', ''},
+		{'', 'default:steel_ingot', 'default:torch'},
+		{'', 'default:steel_ingot', ''},
+	},
+})
+
+
+--misc_nodes
+--crafts for platforms see misc_nodes.lua
diff --git a/advtrains/advtrains/debugitems.lua b/advtrains/advtrains/debugitems.lua
new file mode 100644
index 0000000..e672308
--- /dev/null
+++ b/advtrains/advtrains/debugitems.lua
@@ -0,0 +1,53 @@
+minetest.register_tool("advtrains:tunnelborer",
+{
+	description = "tunnelborer",
+	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
+			for x=-1,1 do
+				for y=-1,1 do
+					for z=-1,1 do
+						minetest.remove_node(vector.add(pointed_thing.under, {x=x, y=y, z=z}))
+					end
+				end
+			end
+		end
+	end,
+}
+)
+
+minetest.register_chatcommand("atyaw",
+	{
+        params = "angledeg conn1 conn2", 
+        description = "", 
+        func = function(name, param)
+			local angledegs, conn1s, conn2s = string.match(param, "^(%S+)%s(%S+)%s(%S+)$")
+			if angledegs and conn1s and conn2s then
+				local angledeg, conn1, conn2 = angledegs+0,conn1s+0,conn2s+0
+				local yaw = angledeg*math.pi/180
+				local yaw1 = advtrains.dir_to_angle(conn1)
+				local yaw2 = advtrains.dir_to_angle(conn2)
+				local adiff1 = advtrains.minAngleDiffRad(yaw, yaw1)
+				local adiff2 = advtrains.minAngleDiffRad(yaw, yaw2)
+				
+				atdebug("yaw1",atfloor(yaw1*180/math.pi))
+				atdebug("yaw2",atfloor(yaw2*180/math.pi))
+				atdebug("dif1",atfloor(adiff1*180/math.pi))
+				atdebug("dif2",atfloor(adiff2*180/math.pi))
+				
+				minetest.chat_send_all(advtrains.yawToAnyDir(yaw))
+				return true, advtrains.yawToDirection(yaw, conn1, conn2)
+			end
+        end,
+})
diff --git a/advtrains/advtrains/debugringbuffer.lua b/advtrains/advtrains/debugringbuffer.lua
new file mode 100644
index 0000000..704c0c5
--- /dev/null
+++ b/advtrains/advtrains/debugringbuffer.lua
@@ -0,0 +1,44 @@
+--so, some ringbuffers one for each train
+
+local ringbuflen=1000
+
+local ringbufs={}
+local ringbufcnt={}
+
+function advtrains.drb_record(tid, msg)
+	if not ringbufs[tid] then
+		ringbufs[tid]={}
+		ringbufcnt[tid]=0
+	end
+	ringbufs[tid][ringbufcnt[tid]]=msg
+	ringbufcnt[tid]=ringbufcnt[tid]+1
+	if ringbufcnt[tid] > ringbuflen then
+		ringbufcnt[tid]=0
+	end
+end
+function advtrains.drb_dump(tid)
+	atdebug("Debug ring buffer output for '"..tid.."':")
+	local stopcnt=ringbufcnt[tid]
+	if not stopcnt then
+		atdebug("ID unknown!")
+		return
+	end
+	repeat
+		atdebug(ringbufs[tid][ringbufcnt[tid]])
+		ringbufcnt[tid]=ringbufcnt[tid]+1
+		if ringbufcnt[tid] > ringbuflen then
+			ringbufcnt[tid]=0
+		end
+	until ringbufcnt[tid]==stopcnt
+end
+
+minetest.register_chatcommand("atdebug_show",
+	{
+        params = "train sid", -- Short parameter description
+        description = "Dump debug log", -- Full description
+        privs = {train_operator=true}, -- Require the "privs" privilege to run
+        func = function(name, param)
+			advtrains.drb_dump(param)
+        end, -- Called when command is run.
+                                      -- Returns boolean success and text output.
+    })
diff --git a/advtrains/advtrains/depends.txt b/advtrains/advtrains/depends.txt
new file mode 100644
index 0000000..1815e54
--- /dev/null
+++ b/advtrains/advtrains/depends.txt
@@ -0,0 +1,3 @@
+default
+mesecons?
+digtron?
+\ No newline at end of file
diff --git a/advtrains/advtrains/description.txt b/advtrains/advtrains/description.txt
new file mode 100644
index 0000000..bb13b97
--- /dev/null
+++ b/advtrains/advtrains/description.txt
@@ -0,0 +1,8 @@
+Advanced Trains v1.3.8, by orwell and contributors. Also see readme.
+Good-looking, realistic trains for minetest.
+
+For crafting recipes, see manual.pdf
+
+Website: http://advtrains.bleipb.de/
+Manual:  https://github.com/orwell96/advtrains/blob/master/manual.pdf
+Forum :  https://forum.minetest.net/viewtopic.php?f=11&t=14726
diff --git a/advtrains/advtrains/helpers.lua b/advtrains/advtrains/helpers.lua
new file mode 100644
index 0000000..65f25ba
--- /dev/null
+++ b/advtrains/advtrains/helpers.lua
@@ -0,0 +1,447 @@
+--advtrains by orwell96, see readme.txt
+
+local dir_trans_tbl={
+	[0]={x=0, z=1, y=0},
+	[1]={x=1, z=2, y=0},
+	[2]={x=1, z=1, y=0},
+	[3]={x=2, z=1, y=0},
+	[4]={x=1, z=0, y=0},
+	[5]={x=2, z=-1, y=0},
+	[6]={x=1, z=-1, y=0},
+	[7]={x=1, z=-2, y=0},
+	[8]={x=0, z=-1, y=0},
+	[9]={x=-1, z=-2, y=0},
+	[10]={x=-1, z=-1, y=0},
+	[11]={x=-2, z=-1, y=0},
+	[12]={x=-1, z=0, y=0},
+	[13]={x=-2, z=1, y=0},
+	[14]={x=-1, z=1, y=0},
+	[15]={x=-1, z=2, y=0},
+}
+
+local dir_angle_tbl={}
+for d,v in pairs(dir_trans_tbl) do
+	local uvec = vector.normalize(v)
+	dir_angle_tbl[d] = math.atan2(-uvec.x, uvec.z)
+end
+
+
+function advtrains.dir_to_angle(dir)
+	return dir_angle_tbl[dir] or error("advtrains: in helpers.lua/dir_to_angle() given dir="..(dir or "nil"))
+end
+
+function advtrains.dirCoordSet(coord, dir)
+	return vector.add(coord, advtrains.dirToCoord(dir))
+end
+advtrains.pos_add_dir = advtrains.dirCoordSet
+
+function advtrains.pos_add_angle(pos, ang)
+	-- 0 is +Z -> meaning of sin/cos swapped
+	return vector.add(pos, {x = -math.sin(ang), y = 0, z = math.cos(ang)})
+end
+
+function advtrains.dirToCoord(dir)
+	return dir_trans_tbl[dir] or error("advtrains: in helpers.lua/dir_to_vector() given dir="..(dir or "nil"))
+end
+advtrains.dir_to_vector = advtrains.dirToCoord
+
+function advtrains.maxN(list, expectstart)
+	local n=expectstart or 0
+	while list[n] do
+		n=n+1
+	end
+	return n-1
+end
+
+function advtrains.minN(list, expectstart)
+	local n=expectstart or 0
+	while list[n] do
+		n=n-1
+	end
+	return n+1
+end
+
+function atround(number)
+	return math.floor(number+0.5)
+end
+atfloor = math.floor
+
+
+function advtrains.round_vector_floor_y(vec)
+	return {x=math.floor(vec.x+0.5), y=math.floor(vec.y), z=math.floor(vec.z+0.5)}
+end
+
+function advtrains.yawToDirection(yaw, conn1, conn2)
+	if not conn1 or not conn2 then
+		error("given nil to yawToDirection: conn1="..(conn1 or "nil").." conn2="..(conn1 or "nil"))
+	end
+	local yaw1 = advtrains.dir_to_angle(conn1)
+	local yaw2 = advtrains.dir_to_angle(conn2)
+	local adiff1 = advtrains.minAngleDiffRad(yaw, yaw1)
+	local adiff2 = advtrains.minAngleDiffRad(yaw, yaw2)
+	
+	if math.abs(adiff2)<math.abs(adiff1) then
+		return conn2
+	else
+		return conn1
+	end
+end
+
+function advtrains.yawToAnyDir(yaw)
+	local min_conn, min_diff=0, 10
+	for conn, vec in pairs(advtrains.dir_trans_tbl) do
+		local yaw1 = advtrains.dir_to_angle(conn)
+		local diff = math.abs(advtrains.minAngleDiffRad(yaw, yaw1))
+		if diff < min_diff then
+			min_conn = conn
+			min_diff = diff
+		end
+	end
+	return min_conn
+end
+function advtrains.yawToClosestConn(yaw, conns)
+	local min_connid, min_diff=1, 10
+	for connid, conn in ipairs(conns) do
+		local yaw1 = advtrains.dir_to_angle(conn.c)
+		local diff = math.abs(advtrains.minAngleDiffRad(yaw, yaw1))
+		if diff < min_diff then
+			min_connid = connid
+			min_diff = diff
+		end
+	end
+	return min_connid
+end
+
+local pi, pi2 = math.pi, 2*math.pi
+function advtrains.minAngleDiffRad(r1, r2)
+	while r1>pi2 do
+		r1=r1-pi2
+	end
+	while r1<0 do
+		r1=r1+pi2
+	end
+	while r2>pi2 do
+		r2=r2-pi2
+	end
+	while r1<0 do
+		r2=r2+pi2
+	end
+	local try1=r2-r1
+	local try2=r2+pi2-r1
+	local try3=r2-pi2-r1
+	
+	local minabs = math.min(math.abs(try1), math.abs(try2), math.abs(try3))
+	if minabs==math.abs(try1) then
+		return try1
+	end
+	if minabs==math.abs(try2) then
+		return try2
+	end
+	if minabs==math.abs(try3) then
+		return try3
+	end
+end
+
+
+-- Takes 2 connections (0...AT_CMAX) as argument
+-- Returns the angle median of those 2 positions from the pov
+-- of standing on the cdir1 side and looking towards cdir2
+-- cdir1 - >NODE> - cdir2
+function advtrains.conn_angle_median(cdir1, cdir2)
+	local ang1 = advtrains.dir_to_angle(advtrains.oppd(cdir1))
+	local ang2 = advtrains.dir_to_angle(cdir2)
+	return ang1 + advtrains.minAngleDiffRad(ang1, ang2)/2
+end
+
+function advtrains.merge_tables(a, ...)
+	local new={}
+	for _,t in ipairs({a,...}) do
+		for k,v in pairs(t) do new[k]=v end
+	end
+	return new
+end
+function advtrains.save_keys(tbl, keys)
+	local new={}
+	for _,key in ipairs(keys) do
+		new[key] = tbl[key]
+	end
+	return new
+end
+
+function advtrains.get_real_index_position(path, index)
+	if not path or not index then return end
+	
+	local first_pos=path[math.floor(index)]
+	local second_pos=path[math.floor(index)+1]
+	
+	if not first_pos or not second_pos then return nil end
+	
+	local factor=index-math.floor(index)
+	local actual_pos={x=first_pos.x-(first_pos.x-second_pos.x)*factor, y=first_pos.y-(first_pos.y-second_pos.y)*factor, z=first_pos.z-(first_pos.z-second_pos.z)*factor,}
+	return actual_pos
+end
+function advtrains.pos_median(pos1, pos2)
+	return {x=pos1.x-(pos1.x-pos2.x)*0.5, y=pos1.y-(pos1.y-pos2.y)*0.5, z=pos1.z-(pos1.z-pos2.z)*0.5}
+end
+function advtrains.abs_ceil(i)
+	return math.ceil(math.abs(i))*math.sign(i)
+end
+
+function advtrains.serialize_inventory(inv)
+	local ser={}
+	local liszts=inv:get_lists()
+	for lisztname, liszt in pairs(liszts) do
+		ser[lisztname]={}
+		for idx, item in ipairs(liszt) do
+			local istring=item:to_string()
+			if istring~="" then
+				ser[lisztname][idx]=istring
+			end
+		end
+	end
+	return minetest.serialize(ser)
+end
+function advtrains.deserialize_inventory(sers, inv)
+	local ser=minetest.deserialize(sers)
+	if ser then
+		inv:set_lists(ser)
+		return true
+	end
+	return false
+end
+
+--is_protected wrapper that checks for protection_bypass privilege
+function advtrains.is_protected(pos, name)
+	if not name then
+		error("advtrains.is_protected() called without name parameter!")
+	end
+	if minetest.check_player_privs(name, {protection_bypass=true}) then
+		--player can bypass protection
+		return false
+	end
+	return minetest.is_protected(pos, name)
+end
+
+function advtrains.is_creative(name)
+	if not name then
+		error("advtrains.is_creative() called without name parameter!")
+	end
+	if minetest.check_player_privs(name, {creative=true}) then
+		return true
+	end
+	return minetest.settings:get_bool("creative_mode")
+end
+
+function advtrains.is_damage_enabled(name)
+	if not name then
+		error("advtrains.is_damage_enabled() called without name parameter!")
+	end
+	if minetest.check_player_privs(name, "train_admin") then
+		return false
+	end
+	return minetest.settings:get_bool("enable_damage")
+end
+
+function advtrains.ms_to_kmh(speed)
+	return speed * 3.6
+end
+
+-- 4 possible inputs:
+-- integer: just do that modulo calculation
+-- table with c set: rotate c
+-- table with tables: rotate each
+-- table with integers: rotate each (probably no use case)
+function advtrains.rotate_conn_by(conn, rotate)
+	if tonumber(conn) then
+		return (conn+rotate)%AT_CMAX
+	elseif conn.c then
+		return { c = (conn.c+rotate)%AT_CMAX, y = conn.y}
+	end
+	local tmp={}
+	for connid, data in ipairs(conn) do
+		tmp[connid]=advtrains.rotate_conn_by(data, rotate)
+	end
+	return tmp
+end
+
+
+function advtrains.oppd(dir)
+	return advtrains.rotate_conn_by(dir, AT_CMAX/2)
+end
+--conn_to_match like rotate_conn_by
+--other_conns have to be a table of conn tables!
+function advtrains.conn_matches_to(conn, other_conns)
+	if tonumber(conn) then
+		for connid, data in ipairs(other_conns) do
+			if advtrains.oppd(conn) == data.c then return connid end
+		end
+		return false
+	elseif conn.c then
+		for connid, data in ipairs(other_conns) do
+			local cmp = advtrains.oppd(conn)
+			if cmp.c == data.c and (cmp.y or 0) == (data.y or 0) then return connid end
+		end
+		return false
+	end
+	local tmp={}
+	for connid, data in ipairs(conn) do
+		local backmatch = advtrains.conn_matches_to(data, other_conns)
+		if backmatch then return backmatch, connid end --returns <connid of other rail> <connid of this rail>
+	end
+	return false
+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>
+-- 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)
+	local this_pos = advtrains.round_vector_floor_y(this_posnr)
+	local this_conns = this_conns_p
+	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
+		end
+		return nil
+	end
+	
+	local conn = this_conns[conn_idx]
+	local conn_y = conn.y or 0
+	local adj_pos = advtrains.dirCoordSet(this_pos, conn.c);
+	
+	while conn_y>=1 do
+		conn_y = conn_y - 1
+		adj_pos.y = adj_pos.y + 1
+	end
+	
+	local nextnode_ok, nextconns, nextrail_y=advtrains.get_rail_info_at(adj_pos, drives_on)
+	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)
+		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
+	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)
+-- 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]
+end
+
+function advtrains.random_id()
+	local idst=""
+	for i=0,5 do
+		idst=idst..(math.random(0,9))
+	end
+	return idst
+end
+-- Shorthand for pos_to_string and round_vector_floor_y
+function advtrains.roundfloorpts(pos)
+	return minetest.pos_to_string(advtrains.round_vector_floor_y(pos))
+end
+
+-- insert an element into a table if it does not yet exist there
+-- equalfunc is a function to compare equality, defaults to ==
+-- returns true if the element was inserted
+function advtrains.insert_once(tab, elem, equalfunc)
+	for _,e in pairs(tab) do
+		if equalfunc and equalfunc(elem, e) or e==elem then return false end
+	end
+	tab[#tab+1] = elem
+	return true
+end
+
+local hext = { [0]="0",[1]="1",[2]="2",[3]="3",[4]="4",[5]="5",[6]="6",[7]="7",[8]="8",[9]="9",[10]="A",[11]="B",[12]="C",[13]="D",[14]="E",[15]="F"}
+local dect = { ["0"]=0,["1"]=1,["2"]=2,["3"]=3,["4"]=4,["5"]=5,["6"]=6,["7"]=7,["8"]=8,["9"]=9,["A"]=10,["B"]=11,["C"]=12,["D"]=13,["E"]=14,["F"]=15}
+
+local f = atfloor
+
+local function hex(i)
+	local x=i+32768
+	local c4 = x % 16
+	x = f(x / 16)
+	local c3 = x % 16
+	x = f(x / 16)
+	local c2 = x % 16
+	x = f(x / 16)
+	local c1 = x % 16
+	return (hext[c1]) .. (hext[c2]) .. (hext[c3]) .. (hext[c4])
+end
+
+local function c(s,i) return dect[string.sub(s,i,i)] end
+
+local function dec(s)
+	return (c(s,1)*4096 + c(s,2)*256 + c(s,3)*16 + c(s,4))-32768
+end
+-- Takes a position vector and outputs a encoded value suitable as table index
+-- This is essentially a hexadecimal representation of the position (+32768)
+-- Order (YYY)YXXXXZZZZ
+function advtrains.encode_pos(pos)
+	return hex(pos.y) .. hex(pos.x) .. hex(pos.z)
+end
+
+-- decodes a position encoded with encode_pos
+function advtrains.decode_pos(pts)
+	if not pts or not #pts==6 then return nil end
+	local stry = string.sub(pts, 1,4)
+	local strx = string.sub(pts, 5,8)
+	local strz = string.sub(pts, 9,12)
+	return vector.new(dec(strx), dec(stry), dec(strz))
+end
+
+--[[ Benchmarking code
+local tdt = {}
+local tlt = {}
+local tet = {}
+
+for i=1,1000000 do
+	tdt[i] = vector.new(math.random(-65536, 65535), math.random(-65536, 65535), math.random(-65536, 65535))
+	if i%1000 == 0 then
+		tlt[#tlt+1] = tdt[i]
+	end
+end
+
+local t1=os.clock()
+for i=1,1000000 do
+	local pe = advtrains.encode_pos(tdt[i])
+	local pb = advtrains.decode_pos(pe)
+	tet[pe] = i
+end
+for i,v in ipairs(tlt) do
+	local lk = tet[advtrains.encode_pos(v)]
+end
+atdebug("endec",os.clock()-t1,"s")
+
+tet = {}
+
+t1=os.clock()
+for i=1,1000000 do
+	local pe = minetest.pos_to_string(tdt[i])
+	local pb = minetest.string_to_pos(pe)
+	tet[pe] = i
+end
+for i,v in ipairs(tlt) do
+	local lk = tet[minetest.pos_to_string(v)]
+end
+atdebug("pts",os.clock()-t1,"s")
+
+--Results:
+--2018-11-29 16:57:08: ACTION[Main]: [advtrains]endec 1.786451 s 
+--2018-11-29 16:57:10: ACTION[Main]: [advtrains]pts 2.566377 s 
+]]
+
+
diff --git a/advtrains/advtrains/init.lua b/advtrains/advtrains/init.lua
new file mode 100644
index 0000000..d6c3c92
--- /dev/null
+++ b/advtrains/advtrains/init.lua
@@ -0,0 +1,597 @@
+
+--[[
+Advanced Trains - Minetest Mod
+
+Copyright (C) 2016-2020  Moritz Blei (orwell96) and contributors
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as
+    published by the Free Software Foundation, either version 3 of the
+    License, or (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+]]
+
+local lot = os.clock()
+minetest.log("action", "[advtrains] Loading...")
+
+-- 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")
+
+--advtrains
+
+DUMP_DEBUG_SAVE = false
+GENERATE_ATRICIFIAL_LAG = false
+
+--Constant for maximum connection value/division of the circle
+AT_CMAX = 16
+
+advtrains = {trains={}, player_to_train_mapping={}}
+
+-- get wagon loading range
+advtrains.wagon_load_range = tonumber(minetest.settings:get("advtrains_wagon_load_range"))
+if not advtrains.wagon_load_range then
+	advtrains.wagon_load_range = tonumber(minetest.settings:get("active_block_range"))*16
+end
+
+--pcall
+local no_action=false
+
+local function reload_saves()
+	atwarn("Restoring saved state in 1 second...")
+	no_action=true
+	advtrains.lock_path_inval = false
+	--read last save state and continue, as if server was restarted
+	for aoi, le in pairs(minetest.luaentities) do
+		if le.is_wagon then
+			le.object:remove()
+		end
+	end
+	minetest.after(1, function()
+		advtrains.load()
+		atwarn("Reload successful!")
+		advtrains.ndb.restore_all()
+	end)
+end
+
+function advtrains.pcall(fun)
+	if no_action then return end
+	
+	local succ, return1, return2, return3, return4=xpcall(fun, function(err)
+			atwarn("Lua Error occured: ", err)
+			atwarn(debug.traceback())
+			if advtrains.atprint_context_tid then
+				advtrains.path_print(advtrains.trains[advtrains.atprint_context_tid], atdebug)
+				atwarn(advtrains.trains[advtrains.atprint_context_tid].debug)
+			end
+		end)
+	if not succ then
+		reload_saves()
+	else
+		return return1, return2, return3, return4
+	end
+end
+
+
+advtrains.modpath = minetest.get_modpath("advtrains")
+
+--Advtrains dump (special treatment of pos and sigd)
+function atdump(t, intend)
+	local str
+	if type(t)=="table" then
+		if t.x and t.y and t.z then
+			str=minetest.pos_to_string(t)
+		elseif t.p and t.s then -- interlocking sigd
+			str="S["..minetest.pos_to_string(t.p).."/"..t.s.."]"
+		elseif advtrains.lines and t.s and t.m then -- RwT
+			str=advtrains.lines.rwt.to_string(t)
+		else
+			str="{"
+			local intd = (intend or "") .. "  "
+			for k,v in pairs(t) do
+				if type(k)~="string" or not string.match(k, "^path[_]?") then
+					-- do not print anything path-related
+					str = str .. "\n" .. intd .. atdump(k, intd) .. " = " ..atdump(v, intd)
+				end
+			end
+			str = str .. "\n" .. (intend or "") .. "}"
+		end
+	elseif type(t)=="boolean" then
+		if t then
+			str="true"
+		else
+			str="false"
+		end
+	elseif type(t)=="function" then
+		str="<function>"
+	elseif type(t)=="userdata" then
+		str="<userdata>"
+	else
+		str=""..t
+	end
+	return str
+end
+
+function advtrains.print_concat_table(a)
+	local str=""
+	local stra=""
+	local t
+	for i=1,20 do
+		t=a[i]
+		if t==nil then
+			stra=stra.."nil "
+		else
+			str=str..stra
+			stra=""
+			str=str..atdump(t).." "
+		end
+	end
+	return str
+end
+
+atprint=function() end
+atlog=function(t, ...)
+	local text=advtrains.print_concat_table({t, ...})
+	minetest.log("action", "[advtrains]"..text)
+end
+atwarn=function(t, ...)
+	local text=advtrains.print_concat_table({t, ...})
+	minetest.log("warning", "[advtrains]"..text)
+	minetest.chat_send_all("[advtrains] -!- "..text)
+end
+sid=function(id) if id then return string.sub(id, -6) end end
+
+
+--ONLY use this function for temporary debugging. for consistent debug prints use atprint
+atdebug=function(t, ...)
+	local text=advtrains.print_concat_table({t, ...})
+	minetest.log("action", "[advtrains]"..text)
+	minetest.chat_send_all("[advtrains]"..text)
+end
+
+if minetest.settings:get_bool("advtrains_enable_debugging") then
+	atprint=function(t, ...)
+		local context=advtrains.atprint_context_tid or ""
+		if not context then return end
+		local text=advtrains.print_concat_table({t, ...})
+		advtrains.drb_record(context, text)
+		
+		--atlog("@@",advtrains.atprint_context_tid,t,...)
+	end
+	dofile(advtrains.modpath.."/debugringbuffer.lua")
+	
+end
+
+function assertt(var, typ)
+	if type(var)~=typ then
+		error("Assertion failed, variable has to be of type "..typ)
+	end
+end
+
+dofile(advtrains.modpath.."/helpers.lua");
+--dofile(advtrains.modpath.."/debugitems.lua");
+
+advtrains.meseconrules = 
+{{x=0,  y=0,  z=-1},
+ {x=1,  y=0,  z=0},
+ {x=-1, y=0,  z=0},
+ {x=0,  y=0,  z=1},
+ {x=1,  y=1,  z=0},
+ {x=1,  y=-1, z=0},
+ {x=-1, y=1,  z=0},
+ {x=-1, y=-1, z=0},
+ {x=0,  y=1,  z=1},
+ {x=0,  y=-1, z=1},
+ {x=0,  y=1,  z=-1},
+ {x=0,  y=-1, z=-1},
+ {x=0, y=-2, z=0}}
+
+advtrains.fpath=minetest.get_worldpath().."/advtrains"
+
+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.."/tracks.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")
+
+dofile(advtrains.modpath.."/signals.lua")
+dofile(advtrains.modpath.."/misc_nodes.lua")
+dofile(advtrains.modpath.."/crafting.lua")
+dofile(advtrains.modpath.."/craft_items.lua")
+
+dofile(advtrains.modpath.."/log.lua")
+dofile(advtrains.modpath.."/passive.lua")
+if mesecon then
+	dofile(advtrains.modpath.."/p_mesecon_iface.lua")
+end
+
+
+dofile(advtrains.modpath.."/lzb.lua")
+
+
+--load/save
+
+-- backup variables, used if someone should accidentally delete a sub-mod
+local MDS_interlocking, MDS_lines
+
+
+advtrains.fpath=minetest.get_worldpath().."/advtrains"
+dofile(advtrains.modpath.."/log.lua")
+function advtrains.read_component(name)
+	local path = advtrains.fpath.."_"..name
+	minetest.log("action", "[advtrains] loading "..path)
+	local file, err = io.open(path, "r")
+	if not file then
+		minetest.log("warning", " Failed to read advtrains save data from file "..path..": "..(err or "Unknown Error"))
+		minetest.log("warning", " (this is normal when first enabling advtrains on this world)")
+		return
+	end
+	local tbl =  minetest.deserialize(file:read("*a"))
+	file:close()
+	return tbl
+end
+
+function advtrains.avt_load()
+	-- check for new, split advtrains save file
+	
+	local version = advtrains.read_component("version")
+	local tbl
+	if version and version == 3 then
+		-- we are dealing with the new, split-up system
+		minetest.log("action", "[advtrains] loading savefiles version 3")
+		local il_save = {
+			tcbs = true,
+			ts = true,
+			signalass = true,
+			rs_locks = true,
+			rs_callbacks = true,
+			influence_points = true,
+			npr_rails = true,
+		}
+		tbl={
+			trains = true,
+			wagon_save = true,
+			ptmap = true,
+			atc = true,
+			ndb = true,		
+			lines = true,
+			version = 2,
+		}
+		for i,k in pairs(il_save) do
+			il_save[i] = advtrains.read_component("interlocking_"..i)
+		end
+		for i,k in pairs(tbl) do
+			tbl[i] = advtrains.read_component(i)
+		end
+		tbl["interlocking"] = il_save
+	else	
+		local file, err = io.open(advtrains.fpath, "r")
+		if not file then
+			minetest.log("warning", " Failed to read advtrains save data from file "..advtrains.fpath..": "..(err or "Unknown Error"))
+			minetest.log("warning", " (this is normal when first enabling advtrains on this world)")
+			return
+		else
+			tbl = minetest.deserialize(file:read("*a"))
+			file:close()
+		end
+	end
+	if type(tbl) == "table" then
+		if tbl.version then
+			--congrats, we have the new save format.
+			advtrains.trains = tbl.trains
+			--Save the train id into the train table to avoid having to pass id around
+			for id, train in pairs(advtrains.trains) do
+				train.id = id
+			end
+			advtrains.wagons = tbl.wagon_save
+			advtrains.player_to_train_mapping = tbl.ptmap or {}
+			advtrains.ndb.load_data(tbl.ndb)
+			advtrains.atc.load_data(tbl.atc)
+			if advtrains.interlocking then
+				advtrains.interlocking.db.load(tbl.interlocking)
+			else
+				MDS_interlocking = tbl.interlocking
+			end
+			if advtrains.lines then
+				advtrains.lines.load(tbl.lines)
+			else
+				MDS_lines = tbl.lines
+			end
+			--remove wagon_save entries that are not part of a train
+			local todel=advtrains.merge_tables(advtrains.wagon_save)
+			for tid, train in pairs(advtrains.trains) do
+				train.id = tid
+				for _, wid in ipairs(train.trainparts) do
+					todel[wid]=nil
+				end
+			end
+			for wid, _ in pairs(todel) do
+				atwarn("Removing unused wagon", wid, "from wagon_save table.")
+				advtrains.wagon_save[wid]=nil
+			end
+		else
+			--oh no, its the old one...
+			advtrains.trains=tbl
+			--load ATC
+			advtrains.fpath_atc=minetest.get_worldpath().."/advtrains_atc"
+			local file, err = io.open(advtrains.fpath_atc, "r")
+			if not file then
+				local er=err or "Unknown Error"
+				atprint("Failed loading advtrains atc save file "..er)
+			else
+				local tbl = minetest.deserialize(file:read("*a"))
+				if type(tbl) == "table" then
+					advtrains.atc.controllers=tbl.controllers
+				end
+				file:close()
+			end
+			--load wagon saves
+			advtrains.fpath_ws=minetest.get_worldpath().."/advtrains_wagon_save"
+			local file, err = io.open(advtrains.fpath_ws, "r")
+			if not file then
+				local er=err or "Unknown Error"
+				atprint("Failed loading advtrains save file "..er)
+			else
+				local tbl = minetest.deserialize(file:read("*a"))
+				if type(tbl) == "table" then
+					advtrains.wagon_save=tbl
+				end
+				file:close()
+			end
+		end
+	else
+		minetest.log("error", " Failed to deserialize advtrains save data: Not a table!")
+	end
+end
+
+advtrains.save_component = function (tbl, name)
+	-- Saves each component of the advtrains file separately
+	--
+	-- required for now to shrink the advtrains db to overcome lua
+	-- limitations.
+	local datastr = minetest.serialize(tbl)
+	if not datastr then
+		minetest.log("error", " Failed to serialize advtrains save data!")
+		return
+	end
+	local path = advtrains.fpath.."_"..name
+	local success = minetest.safe_file_write(path, datastr)
+	
+	if not success then
+		minetest.log("error", " Failed to write advtrains save data to file "..path)
+	end
+	
+end
+
+advtrains.avt_save = function(remove_players_from_wagons)
+	--atprint("saving")
+	
+	if remove_players_from_wagons then
+		for w_id, data in pairs(advtrains.wagons) do
+			data.seatp={}
+		end
+		advtrains.player_to_train_mapping={}
+	end
+	
+	local tmp_trains={}
+	for id, train in pairs(advtrains.trains) do
+		--first, deep_copy the train
+		if #train.trainparts > 0 then
+			local v=advtrains.save_keys(train, {
+				"last_pos", "last_connid", "last_frac", "velocity", "tarvelocity",
+				"trainparts", "recently_collided_with_env",
+				"atc_brake_target", "atc_wait_finish", "atc_command", "atc_delay", "door_open",
+				"text_outside", "text_inside", "line", "routingcode",
+				"il_sections", "speed_restriction", "is_shunt", "points_split", "autocouple"
+			})
+			--then save it
+			tmp_trains[id]=v
+		else
+			atwarn("Train",id,"had no wagons left because of some bug. It is being deleted. Wave it goodbye!")
+			advtrains.remove_train(id)
+		end
+	end
+	
+	for id, wdata in pairs(advtrains.wagons) do
+		local _,proto = advtrains.get_wagon_prototype(wdata)
+		if proto.has_inventory then
+			local inv=minetest.get_inventory({type="detached", name="advtrains_wgn_"..id})
+			if inv then -- inventory is not initialized when wagon was never loaded
+				-- TOOD: What happens with unloading rails when they don't find the inventory?
+				wdata.ser_inv=advtrains.serialize_inventory(inv)
+			end
+		end
+		-- TODO apply save-keys here too
+		-- TODO temp
+		wdata.dcpl_lock = nil
+	end
+	
+	--versions:
+	-- 1 - Initial new save format.
+	-- 2 - version as of tss branch 11-2018+
+	local il_save
+	if advtrains.interlocking then
+		il_save = advtrains.interlocking.db.save()
+	else
+		il_save = MDS_interlocking
+	end
+	local ln_save
+	if advtrains.lines then
+		ln_save = advtrains.lines.save()
+	else
+		ln_save = MDS_lines
+	end
+
+	local save_tbl={
+		trains = tmp_trains,
+		wagon_save = advtrains.wagons,
+		ptmap = advtrains.player_to_train_mapping,
+		atc = advtrains.atc.save_data(),
+		ndb = advtrains.ndb.save_data(),
+		lines = ln_save,
+		version = 3,
+	}
+	for i,k in pairs(save_tbl) do
+		advtrains.save_component(k,i)
+	end
+	
+	for i,k in pairs(il_save) do
+		advtrains.save_component(k,"interlocking_"..i)
+	end
+	
+	if DUMP_DEBUG_SAVE then
+		local file, err = io.open(advtrains.fpath.."_DUMP", "w")
+		if err then
+			return
+		end
+		file:write(dump(save_tbl))
+		file:close()
+	end
+end
+
+--## MAIN LOOP ##--
+--Calls all subsequent main tasks of both advtrains and atlatc
+local init_load=false
+local save_interval=20
+local save_timer=save_interval
+advtrains.mainloop_runcnt=0
+
+
+local t = 0
+minetest.register_globalstep(function(dtime_mt)
+	return advtrains.pcall(function()
+		advtrains.mainloop_runcnt=advtrains.mainloop_runcnt+1
+		--atprint("Running the main loop, runcnt",advtrains.mainloop_runcnt)
+		--call load once. see advtrains.load() comment
+		if not init_load then
+			advtrains.load()
+		end
+		
+		local dtime
+		if GENERATE_ATRICIFIAL_LAG then
+			dtime = 0.2
+			if os.clock()<t then
+				return
+			end
+			
+			t = os.clock()+0.2
+		else
+			--limit dtime: if trains move too far in one step, automation may cause stuck and wrongly braking trains
+			dtime=dtime_mt
+			if dtime>0.2 then
+				atprint("Limiting dtime to 0.2!")
+				dtime=0.2
+			end
+		end
+		
+		advtrains.mainloop_trainlogic(dtime)
+		if advtrains_itm_mainloop then
+			advtrains_itm_mainloop(dtime)
+		end
+		if atlatc then
+			atlatc.mainloop_stepcode(dtime)
+			atlatc.interrupt.mainloop(dtime)
+		end
+		if advtrains.lines then
+			advtrains.lines.step(dtime)
+		end
+		
+		--trigger a save when necessary
+		save_timer=save_timer-dtime
+		if save_timer<=0 then
+			local t=os.clock()
+			--save
+			advtrains.save()
+			save_timer=save_interval
+			atprintbm("saving", t)
+		end
+	end)
+end)
+
+--if something goes wrong in these functions, there is no help. no pcall here.
+
+--## MAIN LOAD ROUTINE ##
+-- Causes the loading of everything
+-- first time called in main loop (after the init phase) because luaautomation has to initialize first.
+function advtrains.load()
+	advtrains.avt_load() --loading advtrains. includes ndb at advtrains.ndb.load_data()
+	if atlatc then
+		atlatc.load() --includes interrupts
+	end
+	if advtrains_itm_init then
+		advtrains_itm_init()
+	end
+	init_load=true
+	no_action=false
+	atlog("[load_all]Loaded advtrains save files")
+end
+
+--## MAIN SAVE ROUTINE ##
+-- Causes the saving of everything
+function advtrains.save(remove_players_from_wagons)
+	if not init_load then
+		--wait... we haven't loaded yet?!
+		atwarn("Instructed to save() but load() was never called!")
+		return
+	end
+	advtrains.avt_save(remove_players_from_wagons) --saving advtrains. includes ndb at advtrains.ndb.save_data()
+	if atlatc then
+		atlatc.save()
+	end
+	atprint("[save_all]Saved advtrains save files")
+	
+	--TODO very simple yet hacky workaround for the "green signals" bug
+	advtrains.invalidate_all_paths()
+end
+minetest.register_on_shutdown(advtrains.save)
+
+-- This chat command provides a solution to the problem known on the LinuxWorks server
+-- There are many players that joined a single time, got on a train and then left forever
+-- These players still occupy seats in the trains.
+minetest.register_chatcommand("at_empty_seats",
+	{
+        params = "", -- Short parameter description
+        description = "Detach all players, especially the offline ones, from all trains. Use only when no one serious is on a train.", -- Full description
+        privs = {train_operator=true, server=true}, -- Require the "privs" privilege to run
+        func = function(name, param)
+			return advtrains.pcall(function()
+				atwarn("Data is being saved. While saving, advtrains will remove the players from trains. Save files will be reloaded afterwards!")
+				advtrains.save(true)
+				reload_saves()
+			end)
+        end,
+})
+-- This chat command solves another problem: Trains getting randomly stuck.
+minetest.register_chatcommand("at_reroute",
+	{
+        params = "", 
+        description = "Delete all train routes, force them to recalculate", 
+        privs = {train_operator=true}, -- Only train operator is required, since this is relatively safe.
+        func = function(name, param)
+			return advtrains.pcall(function()
+				advtrains.invalidate_all_paths()
+				return true, "Successfully invalidated train routes"
+			end)
+        end,
+})
+
+
+local tot=(os.clock()-lot)*1000
+minetest.log("action", "[advtrains] Loaded in "..tot.."ms")
+
diff --git a/advtrains/advtrains/locale/advtrains.de.tr b/advtrains/advtrains/locale/advtrains.de.tr
new file mode 100644
index 0000000..f0d797f
--- /dev/null
+++ b/advtrains/advtrains/locale/advtrains.de.tr
@@ -0,0 +1,71 @@
+# textdomain: advtrains
+This wagon is owned by @1, you can't destroy it.=Dieser Waggon gehört @1, du kannst ihn nicht abbauen.
+Warning: If you destroy this wagon, you only get some steel back! If you are sure, hold Sneak and left-click the wagon.=Warnung: Du erhältst nur etwas Stahl zurück. Wenn du sicher bist, dass du den Waggon zerstören willst, halte 'Schleichen' und klicke links.
+Show Inventory=Zeige Inventar
+Select seat:=Wähle einen Sitzplatz aus:
+ATC controller, unconfigured.=Zugbeeinflussungsschiene, nicht konfiguiert.
+ATC controller=Zugbeeinflussungsschiene
+ATC controller, mode @1@nChannel: @2=Zugbeeinflussungsschiene in Betriebsart "@1"@nKanal: @2
+ATC controller, mode @1@nCommand: @2=Zugbeeinflussungsschiene in Betriebsart "@1"@nBefehl: @2
+Command=Befehl
+Command (on)=Befehl (wenn ein)
+Digiline channel=Digiline-Kanal
+Save=Speichern
+ATC Reverse command warning: didn't reverse train, train moving!=Zugbeeinflussung - Warnung: Befehl 'R' nicht ausgeführt, Zug in Bewegung!
+ATC command syntax error: I statement not closed: @1=Zugbeeinflussung - Syntaxfehler: I-Anweisung nicht geschlossen: @1
+ATC command parse error: Unknown command: @1=Zugbeeinflussung - Fehler: Unbekannter Befehl: @1
+This position is protected!=Diese Position ist geschützt!
+You need to own at least one neighboring wagon to destroy this couple.=Du musst Besitzer eines angrenzenden Waggons sein, um hier abzukuppeln.
+@1 Platform (low)=Niedriger @1-Bahnsteig
+@1 Platform (high)=Hoher @1-Bahnsteig
+off=aus
+on=ein
+Lampless Signal (@1)=Mechanisches Signal (@1)
+Signal (@1)=Lichtsignal (@1)
+Track Worker Tool@n@nLeft-click: change rail type (straight/curve/switch)@nRight-click: rotate rail/bumper/signal/etc.=Schienenwerkzeug@n@nLinksklick: Schienentyp ändern, Rechtsklick: Objekt drehen.
+This node can't be rotated using the trackworker!=Kann diesen Block nicht mit dem Schienenwerkzeug drehen.
+This node can't be changed using the trackworker!=Kann diesen Block nicht mit dem Schienenwerkzeug bearbeiten.
+Can't place: not pointing at node=Kann nicht platzieren: Du zeigst nicht auf einen Block.
+Can't place: space occupied!=Kann nicht platzieren: Platz besetzt.
+Can't place: protected position!=Kann nicht platzieren: Position geschützt.
+Can't place: Not enough slope items left (@1 required)=Kann nicht platzieren: nicht genug Steigungsblöcke, es werden insgesamt @1 benötigt.
+Can't place: There's no slope of length @1=Kann nicht platzieren: Keine Steigung der Länge @1 definiert.
+Can't place: no supporting node at upper end.=Kann nicht platzieren: kein unterstützender Block am Ende der Steigung.
+Deprecated Track=ausrangierte Schiene, nicht verwenden.
+Track=Schiene
+Bumper=Prellbock
+Detector Rail=Detektorschiene
+Speed:=Geschw.:
+Target:=Zielges.:
+@1 Slope=@1 Steigung
+Can't get on: wagon full or doors closed!=Kann nicht einsteigen: Waggon voll oder Türen geschlossen.
+Use Sneak+rightclick to bypass closed doors!=Nutze Sneak+Rechtsklick, um die Türnotöffnung zu aktivieren und trotzdem einzusteigen.
+Lock couples=Kupplungen sperren
+Save wagon properties=Waggon-Einstellungen speichern
+Doors are closed! Use Sneak+rightclick to ignore the closed doors and get off!=Türen sind geschlossen! Sneak+Rechtsklick, um die Türnotöffnung zu aktivieren und trotzdem auszusteigen.
+Wagon properties=Waggon-Einstellungen
+Get off=Aussteigen
+Get off (forced)=Aussteigen (erzwingen)
+(Doors closed)=(Türen geschlossen)
+Access to @1=Zugang zu @1
+Default Seat=Standardsitzplatz
+Default Seat (driver stand)=Standardsitzplatz (Führerstand)
+Driver Stand=Führerstand
+Driver Stand (left)=Führerstand Links
+Driver Stand (right)=Führerstand Rechts
+Industrial Train Engine=Industrielle Lokomotive
+Industrial tank wagon=Tankwaggon
+Industrial wood wagon=Holztransportwaggon
+Japanese Train Engine=Japanische Personenzug-Lokomotive
+Japanese Train Wagon=Japanischer Personenzug-Passagierwaggon
+Steam Engine=Dampflokomotive
+Detailed Steam Engine=detaillierte Dampflokomotive
+Passenger Wagon=Passagierwaggon
+Box wagon=Güterwaggon
+Subway Passenger Wagon=U-Bahn-Waggon
+The wagon's inventory is not empty!=Das Inventar dieses Waggons ist nicht leer!
+This track can not be changed!=Diese Schiene kann nicht geändert werden!
+This track can not be rotated!=Diese Schiene kann nicht gedreht werden!
+Position is occupied by a train.=Ein Zug steht an dieser Position.
+There's a Track Circuit Break here.=Hier ist eine Gleisabschnittsgrenze (TCB).
+There's a Signal Influence Point here.=Hier ist ein Signal-Beeinflussungspunkt.
diff --git a/advtrains/advtrains/locale/advtrains.zh_CN.tr b/advtrains/advtrains/locale/advtrains.zh_CN.tr
new file mode 100644
index 0000000..ef9c99b
--- /dev/null
+++ b/advtrains/advtrains/locale/advtrains.zh_CN.tr
@@ -0,0 +1,107 @@
+# textdomain: advtrains
+
+# Advtrains Core (unorganized)
+This wagon is owned by @1, you can't destroy it.=这是@1的车厢, 你不能摧毁它.
+Warning: If you destroy this wagon, you only get some steel back! If you are sure, hold Sneak and left-click the wagon.=警告: 如果你摧毁此车厢, 你只能拿到一些钢方块. 如果你确定要摧毁这个车厢,请按潜行键并左键单击此车厢.
+ATC controller, unconfigured.=ATC控制器 (未配置)
+ATC controller=ATC控制器
+ATC controller, mode @1@nChannel: @2=ATC控制器@n模式: @1@n频道: @2
+ATC controller, mode @1@nCommand: @2=ATC控制器@n模式: @1@n命令: @2
+Command=命令
+Command (on)=命令（激活时）
+Digiline channel=Digiline 频道
+ATC Reverse command warning: didn't reverse train, train moving!=ATC警告:未执行“R”命令, 火车在移动
+ATC command syntax error: I statement not closed: @1=ATC语法错误: "I"命令不完整: @1
+ATC command parse error: Unknown command: @1=ATC语法错误: 未知命令: @1
+This position is protected!=这里已被保护.
+You need to own at least one neighboring wagon to destroy this couple.=你必须至少拥有其中一个车厢才能解耦这两个车厢.
+This node can't be rotated using the trackworker!=你不能使用铁路调整工具旋转这个方块.
+This node can't be changed using the trackworker!=你不能使用铁路调整工具调整这个方块.
+Can't place: not pointing at node=无法放置: 你没有选择任何方块.
+Can't place: space occupied!=无法放置: 此区域已被占用.
+Can't place: protected position!=无法放置: 此区域已被保护.
+Can't place: Not enough slope items left (@1 required)=无法放置: 你没有足够的铁路斜坡放置工具 (你需要@1个)
+Can't place: There's no slope of length @1=无法放置: advtrains不支持长度为@1m的斜坡.
+Can't place: no supporting node at upper end.=无法放置: 较高端没有支撑方块.
+Deprecated Track=请不要使用
+Can't get on: wagon full or doors closed!=无法上车: 车门已关闭或车厢已满
+Use Sneak+rightclick to bypass closed doors!=请使用潜行+右键上车
+Lock couples=锁定连接处
+Doors are closed! Use Sneak+rightclick to ignore the closed doors and get off!=车门已关闭, 请使用潜行+右键单击下车
+Access to @1=可前往@1
+The clipboard couldn't access the metadata. Paste failed.=无法粘贴: 剪贴板无法访问元数据
+The clipboard couldn't access the metadata. Copy failed.=无法复制: 剪贴板无法访问元数据
+
+# Train HUD/Formspecs
+Speed:=速度:
+Target:=目标速度:
+Show Inventory=显示物品栏
+Select seat:=请选择座位
+Wagon properties=车厢属性
+Save wagon properties=保存车厢属性
+Text displayed outside on train=车厢外部显示
+Text displayed inside train=车厢内部显示
+Line=火车线路
+Routingcode=路由码
+Get off=下车
+Get off (forced)=强制下车
+(Doors closed)=(车门已关闭)
+
+# General
+Save=保存
+# "off" and "on" can be translated differently depending on the context and are therefore not translated.
+off=off
+on=on
+
+# Line automation
+Station Code=车站代码
+Station Name=车站名称
+Door Delay=车门关闭时间
+Departure Speed=出发速度
+Stop Time=停站时间
+
+# Items
+Track Worker Tool@n@nLeft-click: change rail type (straight/curve/switch)@nRight-click: rotate rail/bumper/signal/etc.=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
+Passive Component Naming Tool@n@nRight-click to name a passive component.=被动元件命名工具@n@n右键单击命名所选元件.
+Train copy/paste tool@n@nLeft-click: copy train@nRight-click: paste train=火车复制工具@n@n左键单击: 复制@n右键单击: 粘帖
+Track=铁轨
+Perpendicular Diamond Crossing Track=垂直交叉铁轨
+45/90 Degree Diamond Crossing Track=45度交叉铁轨
+Unloading Track=卸货铁轨
+Loading Track=装货铁轨
+Bumper=保险杠
+Detector Rail=探测铁轨
+@1 Slope=@1斜坡
+@1 Platform (low)=50cm高的@1站台
+@1 Platform (high)=1m高的@1站台
+@1 Platform (45 degree)=1m高的@1站台 (45度)
+Lampless Signal (@1)=臂板信号机 (@1)
+Signal (@1)=信号灯 (@1)
+Wallmounted Signal (l)=壁挂式信号灯 (左侧)
+Wallmounted Signal (r)=壁挂式信号灯 (右侧)
+Wallmounted Signal (t)=悬挂式信号灯
+Andrew's Cross=铁路道口信号灯
+Boiler=锅炉
+driver's cab=驾驶室
+Wheel=车轮
+Chimney=烟囱
+
+# Seats
+Default Seat=默认座位
+Default Seat (driver stand)=默认座位 (司机座位)
+Driver Stand=司机座位
+Driver Stand (left)=左侧司机座位
+Driver Stand (right)=右侧司机座位
+
+# Wagon/engine types
+Industrial Train Engine=工业用火车头
+Big Industrial Train Engine=大型工业用火车头
+Industrial tank wagon=液体运输车厢
+Industrial wood wagon=木材运输车厢
+Japanese Train Engine=高速列车车头
+Japanese Train Wagon=高速列车车厢
+Steam Engine=蒸汽机车
+Detailed Steam Engine=精细的蒸汽机车
+Passenger Wagon=客车
+Box Wagon=货运车厢
+Subway Passenger Wagon=地铁车厢
diff --git a/advtrains/advtrains/log.lua b/advtrains/advtrains/log.lua
new file mode 100644
index 0000000..d7053a2
--- /dev/null
+++ b/advtrains/advtrains/log.lua
@@ -0,0 +1,17 @@
+-- Log accesses to driver stands and changes to switches
+
+advtrains.log = function() end
+
+if minetest.settings:get_bool("advtrains_enable_logging") then
+	advtrains.logfile = advtrains.fpath .. "_log"
+
+	local log = io.open(advtrains.logfile, "a+")
+	
+	function advtrains.log (event, player, pos, data)
+	   log:write(os.date()..": "..event.." by "..player.." at "..minetest.pos_to_string(pos).." -- "..(data or "").."\n")
+	end
+	
+	minetest.register_on_shutdown(function()
+		log:close()
+	end)
+end
diff --git a/advtrains/advtrains/lzb.lua b/advtrains/advtrains/lzb.lua
new file mode 100644
index 0000000..6cbf4ab
--- /dev/null
+++ b/advtrains/advtrains/lzb.lua
@@ -0,0 +1,191 @@
+-- lzb.lua
+-- Enforced and/or automatic train override control, providing the on_train_approach callback
+
+--[[
+Documentation of train.lzb table
+train.lzb = {
+	trav = Current index that the traverser has advanced so far
+	oncoming = table containing oncoming signals, in order of appearance on the path
+		{
+			pos = position of the point
+			idx = where this is on the path
+			spd = speed allowed to pass
+			fun = function(pos, id, train, index, speed, lzbdata)
+			-- Function that determines what to do on the train in the moment it drives over that point.
+		}
+}
+each step, for every item in "oncoming", we need to determine the location to start braking (+ some safety margin)
+and, if we passed this point for at least one of the items, initiate brake.
+When speed has dropped below, say 3, decrease the margin to zero, so that trains actually stop at the signal IP.
+The spd variable and travsht need to be updated on every aspect change. it's probably best to reset everything when any aspect changes
+]]
+
+
+local params = {
+	BRAKE_SPACE = 10,
+	AWARE_ZONE  = 50,
+
+	ADD_STAND  =  2.5,
+	ADD_SLOW   =  1.5,
+	ADD_FAST   =  7,
+	ZONE_ROLL  =  2,
+	ZONE_HOLD  =  5, -- added on top of ZONE_ROLL
+	ZONE_VSLOW =  3, -- When speed is <2, still allow accelerating
+
+	DST_FACTOR =  1.5,
+
+	SHUNT_SPEED_MAX = advtrains.SHUNT_SPEED_MAX,
+}
+
+function advtrains.set_lzb_param(par, val)
+	if params[par] and tonumber(val) then
+		params[par] = tonumber(val)
+	else
+		error("Inexistant param or not a number")
+	end
+end
+
+
+local function look_ahead(id, train)
+	
+	local acc = advtrains.get_acceleration(train, 1)
+	local vel = train.velocity
+	local brakedst = ( -(vel*vel) / (2*acc) ) * params.DST_FACTOR
+	
+	local brake_i = advtrains.path_get_index_by_offset(train, train.index, brakedst + params.BRAKE_SPACE)
+	--local aware_i = advtrains.path_get_index_by_offset(train, brake_i, AWARE_ZONE)
+	
+	local lzb = train.lzb
+	local trav = lzb.trav
+	
+	--train.debug = lspd
+	
+	while trav <= brake_i do
+		trav = trav + 1
+		local pos = advtrains.path_get(train, trav)
+		-- check offtrack
+		if trav > train.path_trk_f then
+			table.insert(lzb.oncoming, {
+				pos = pos,
+				idx = trav-1,
+				spd = 0,
+			})
+		else
+			-- run callbacks
+			-- Note: those callbacks are defined in trainlogic.lua for consistency with the other node callbacks
+			advtrains.tnc_call_approach_callback(pos, id, train, trav, lzb.data)
+			
+		end
+	end
+	
+	lzb.trav = trav
+	
+end
+
+--[[
+Distance needed to accelerate from v0 to v1 with constant acceleration a:
+
+         v1 - v0     a   / v1 - v0 \ 2     v1^2 - v0^2
+s = v0 * -------  +  - * | ------- |    =  -----------
+            a        2   \    a    /           2*a
+]]
+
+local function apply_control(id, train)
+	local lzb = train.lzb
+	
+	local i = 1
+	while i<=#lzb.oncoming do
+		if lzb.oncoming[i].idx < train.index then
+			local ent = lzb.oncoming[i]
+			if ent.fun then
+				ent.fun(ent.pos, id, train, ent.idx, ent.spd, lzb.data)
+			end
+			
+			table.remove(lzb.oncoming, i)
+		else
+			i = i + 1
+		end
+	end
+	
+	for i, it in ipairs(lzb.oncoming) do
+		local a = advtrains.get_acceleration(train, 1) --should be negative
+		local v0 = train.velocity
+		local v1 = it.spd
+		if v1 and v1 <= v0 then
+			local s = (v1*v1 - v0*v0) / (2*a)
+			
+			local st = s + params.ADD_SLOW
+			if v0 > 3 then
+				st = s + params.ADD_FAST
+			end
+			if v0<=0 then
+				st = s + params.ADD_STAND
+			end
+			
+			local i = advtrains.path_get_index_by_offset(train, it.idx, -st)
+			
+			--train.debug = dump({v0f=v0*f, aff=a*f*f,v0=v0, v1=v1, f=f, a=a, s=s, st=st, i=i, idx=train.index})
+			if i <= train.index then
+				-- Gotcha! Braking...
+				train.ctrl.lzb = 1
+				--train.debug = train.debug .. "BRAKE!!!"
+				return
+			end
+			
+			i = advtrains.path_get_index_by_offset(train, i, -params.ZONE_ROLL)
+			if i <= train.index and v0>1 then
+				-- roll control
+				train.ctrl.lzb = 2
+				return
+			end
+			i = advtrains.path_get_index_by_offset(train, i, -params.ZONE_HOLD)
+			if i <= train.index and v0>1 then
+				-- hold speed
+				train.ctrl.lzb = 3
+				return
+			end
+		end
+	end
+	train.ctrl.lzb = nil
+end
+
+local function invalidate(train)
+	train.lzb = {
+		trav = atfloor(train.index),
+		data = {},
+		oncoming = {},
+	}
+end
+
+function advtrains.lzb_invalidate(train)
+	invalidate(train)
+end
+
+-- Add LZB control point
+-- udata: User-defined additional data
+function advtrains.lzb_add_checkpoint(train, index, speed, callback, udata)
+	local lzb = train.lzb
+	local pos = advtrains.path_get(train, index)
+	table.insert(lzb.oncoming, {
+		pos = pos,
+		idx = index,
+		spd = speed,
+		fun = callback,
+		udata = udata,
+	})
+end
+
+
+advtrains.te_register_on_new_path(function(id, train)
+	invalidate(train)
+	look_ahead(id, train)
+end)
+
+advtrains.te_register_on_update(function(id, train)
+	if not train.path or not train.lzb then
+		atprint("LZB run: no path on train, skip step")
+		return
+	end
+	look_ahead(id, train)
+	apply_control(id, train)
+end, true)
diff --git a/advtrains/advtrains/misc_nodes.lua b/advtrains/advtrains/misc_nodes.lua
new file mode 100644
index 0000000..93d5572
--- /dev/null
+++ b/advtrains/advtrains/misc_nodes.lua
@@ -0,0 +1,118 @@
+--all nodes that do not fit in any other category
+
+function advtrains.register_platform(modprefix, preset)
+	local ndef=minetest.registered_nodes[preset]
+	if not ndef then 
+		minetest.log("warning", " register_platform couldn't find preset node "..preset)
+		return
+	end
+	local btex=ndef.tiles
+	if type(btex)=="table" then
+		btex=btex[1]
+	end
+	local desc=ndef.description or ""
+	local nodename=string.match(preset, ":(.+)$")
+	minetest.register_node(modprefix .. ":platform_low_"..nodename, {
+		description = attrans("@1 Platform (low)", desc),
+		tiles = {btex.."^advtrains_platform.png", btex, btex, btex, btex, btex},
+		groups = {cracky = 1, not_blocking_trains = 1, platform=1},
+		sounds = default.node_sound_stone_defaults(),
+		drawtype = "nodebox",
+		node_box = {
+			type = "fixed",
+			fixed = {
+				{-0.5, -0.1, -0.1, 0.5,  0  , 0.5},
+				{-0.5, -0.5,  0  , 0.5, -0.1, 0.5}
+			},
+		},
+		paramtype2="facedir",
+		paramtype = "light",
+		sunlight_propagates = true,
+	})
+	minetest.register_node(modprefix .. ":platform_high_"..nodename, {
+		description = attrans("@1 Platform (high)", desc),
+		tiles = {btex.."^advtrains_platform.png", btex, btex, btex, btex, btex},
+		groups = {cracky = 1, not_blocking_trains = 1, platform=2},
+		sounds = default.node_sound_stone_defaults(),
+		drawtype = "nodebox",
+		node_box = {
+			type = "fixed",
+			fixed = {
+				{-0.5,  0.3, 0, 0.5,  0.5, 0.5},
+				{-0.5, -0.5, 0.1  , 0.5,  0.3, 0.5}
+			},
+		},
+		paramtype2="facedir",
+		paramtype = "light",
+		sunlight_propagates = true,
+	})
+	local diagonalbox = {
+			type = "fixed",
+			fixed = {
+				{-0.5,  -0.5, 0.5, -0.25, 0.5, -0.8 },
+				{-0.25, -0.5, 0.5 , 0,    0.5, -0.55},
+				{0,     -0.5, 0.5 , 0.25, 0.5, -0.3 },
+				{0.25 , -0.5, 0.5,  0.5,  0.5, -0.05}
+			}
+	}
+	minetest.register_node(modprefix..":platform_45_"..nodename, {
+		description = attrans("@1 Platform (45 degree)", desc),
+		groups = {cracky = 1, not_blocking_trains = 1, platform=2},
+		sounds = default.node_sound_stone_defaults(),
+		drawtype = "mesh",
+		mesh = "advtrains_platform_diag.b3d",
+		selection_box = diagonalbox,
+		collision_box = diagonalbox,
+		tiles = {btex, btex.."^advtrains_platform_diag.png"},
+		paramtype2 = "facedir",
+		paramtype = "light",
+		sunlight_propagates = true,
+	})
+	local diagonalbox_low = {
+			type = "fixed",
+			fixed = {
+				{-0.5,  -0.5, 0.5, -0.25, 0, -0.8 },
+				{-0.25, -0.5, 0.5 , 0,    0, -0.55},
+				{0,     -0.5, 0.5 , 0.25, 0, -0.3 },
+				{0.25 , -0.5, 0.5,  0.5,  0, -0.05}
+			}
+	}
+	minetest.register_node(modprefix..":platform_45_low_"..nodename, {
+		description = attrans("@1 Platform (low, 45 degree)", desc),
+		groups = {cracky = 1, not_blocking_trains = 1, platform=2},
+		sounds = default.node_sound_stone_defaults(),
+		drawtype = "mesh",
+		mesh = "advtrains_platform_diag_low.b3d",
+		selection_box = diagonalbox_low,
+		collision_box = diagonalbox_low,
+		tiles = {btex, btex.."^advtrains_platform_diag.png"},
+		paramtype2 = "facedir",
+		paramtype = "light",
+		sunlight_propagates = true,
+	})
+	minetest.register_craft({
+		type="shapeless",
+		output = modprefix .. ":platform_high_"..nodename.." 4",
+		recipe = {
+			"dye:yellow", preset, preset
+		},
+	})
+	minetest.register_craft({
+		type="shapeless",
+		output = modprefix .. ":platform_low_"..nodename.." 4",
+		recipe = {
+			"dye:yellow", preset
+		},
+	})
+	minetest.register_craft({
+		type="shapeless",
+		output = modprefix .. ":platform_45_"..nodename.." 2",
+		recipe = {
+			"dye:yellow", preset, preset, preset
+		}
+	})
+end
+
+
+advtrains.register_platform("advtrains", "default:stonebrick")
+advtrains.register_platform("advtrains", "default:sandstonebrick")
diff --git a/advtrains/advtrains/models/advtrains_across.obj b/advtrains/advtrains/models/advtrains_across.obj
new file mode 100644
index 0000000..4ebf393
--- /dev/null
+++ b/advtrains/advtrains/models/advtrains_across.obj
@@ -0,0 +1,537 @@
+# Blender v2.78 (sub 0) OBJ File: 'andreaskreuz.blend'
+# www.blender.org
+o Cube
+v 0.183133 0.500062 -0.365883
+v 0.300122 0.552646 -0.365883
+v 0.300122 0.552646 -0.337392
+v 0.183133 0.500062 -0.337392
+v -0.300121 1.575195 -0.365883
+v -0.183133 1.627780 -0.365883
+v -0.183133 1.627780 -0.337392
+v -0.300121 1.575195 -0.337392
+v -0.035079 -0.503415 -0.299723
+v -0.035079 1.055075 -0.299723
+v -0.024805 -0.503415 -0.324528
+v -0.024805 1.055075 -0.324528
+v -0.000000 -0.503415 -0.334802
+v -0.000000 1.055075 -0.334802
+v 0.024805 -0.503415 -0.324528
+v 0.024805 1.055075 -0.324528
+v 0.035079 -0.503415 -0.299723
+v 0.035079 1.055075 -0.299723
+v 0.024805 -0.503415 -0.274918
+v 0.024805 1.055075 -0.274918
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+v -0.000000 1.055075 -0.264644
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+v -0.024805 1.055075 -0.274918
+v -0.000000 -0.698893 -0.299723
+v -0.032318 0.979391 -0.365883
+v -0.084671 1.095865 -0.365883
+v 0.084671 1.031976 -0.365883
+v 0.032318 1.148450 -0.365883
+v 0.084671 1.031976 -0.337392
+v 0.032318 1.148450 -0.337392
+v -0.032318 0.979391 -0.337392
+v -0.084671 1.095865 -0.337392
+v -0.133841 1.055075 -0.323880
+v -0.096352 1.055075 -0.376499
+v -0.115909 0.988154 -0.323880
+v -0.083444 1.006899 -0.376499
+v -0.066920 0.939165 -0.323880
+v -0.048176 0.971631 -0.376499
+v -0.000000 0.921234 -0.323880
+v -0.000000 0.958722 -0.376499
+v 0.066920 0.939165 -0.323880
+v 0.048176 0.971631 -0.376499
+v 0.115909 0.988154 -0.323880
+v 0.083443 1.006899 -0.376499
+v 0.133841 1.055075 -0.323880
+v 0.096352 1.055075 -0.376499
+v 0.115909 1.121995 -0.323880
+v 0.083443 1.103251 -0.376499
+v 0.066920 1.170984 -0.323880
+v 0.048176 1.138518 -0.376499
+v 0.000000 1.188915 -0.323880
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new file mode 100644
index 0000000..a6d9745
--- /dev/null
+++ b/advtrains/advtrains/models/advtrains_dtrack_bumper_st.b3d
diff --git a/advtrains/advtrains/models/advtrains_dtrack_bumper_st_30.b3d b/advtrains/advtrains/models/advtrains_dtrack_bumper_st_30.b3d
new file mode 100644
index 0000000..5f5b3f4
--- /dev/null
+++ b/advtrains/advtrains/models/advtrains_dtrack_bumper_st_30.b3d
diff --git a/advtrains/advtrains/models/advtrains_dtrack_bumper_st_45.b3d b/advtrains/advtrains/models/advtrains_dtrack_bumper_st_45.b3d
new file mode 100644
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--- /dev/null
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diff --git a/advtrains/advtrains/models/advtrains_dtrack_bumper_st_60.b3d b/advtrains/advtrains/models/advtrains_dtrack_bumper_st_60.b3d
new file mode 100644
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--- /dev/null
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new file mode 100644
index 0000000..c708292
--- /dev/null
+++ b/advtrains/advtrains/models/advtrains_dtrack_cr.b3d
diff --git a/advtrains/advtrains/models/advtrains_dtrack_cr_30.b3d b/advtrains/advtrains/models/advtrains_dtrack_cr_30.b3d
new file mode 100644
index 0000000..7ca0bda
--- /dev/null
+++ b/advtrains/advtrains/models/advtrains_dtrack_cr_30.b3d
diff --git a/advtrains/advtrains/models/advtrains_dtrack_cr_45.b3d b/advtrains/advtrains/models/advtrains_dtrack_cr_45.b3d
new file mode 100644
index 0000000..b22ea0d
--- /dev/null
+++ b/advtrains/advtrains/models/advtrains_dtrack_cr_45.b3d
diff --git a/advtrains/advtrains/models/advtrains_dtrack_cr_60.b3d b/advtrains/advtrains/models/advtrains_dtrack_cr_60.b3d
new file mode 100644
index 0000000..e9b16d6
--- /dev/null
+++ b/advtrains/advtrains/models/advtrains_dtrack_cr_60.b3d
diff --git a/advtrains/advtrains/models/advtrains_dtrack_st.b3d b/advtrains/advtrains/models/advtrains_dtrack_st.b3d
new file mode 100644
index 0000000..c240416
--- /dev/null
+++ b/advtrains/advtrains/models/advtrains_dtrack_st.b3d
diff --git a/advtrains/advtrains/models/advtrains_dtrack_st_30.b3d b/advtrains/advtrains/models/advtrains_dtrack_st_30.b3d
new file mode 100644
index 0000000..fd77e66
--- /dev/null
+++ b/advtrains/advtrains/models/advtrains_dtrack_st_30.b3d
diff --git a/advtrains/advtrains/models/advtrains_dtrack_st_45.b3d b/advtrains/advtrains/models/advtrains_dtrack_st_45.b3d
new file mode 100644
index 0000000..af3afb1
--- /dev/null
+++ b/advtrains/advtrains/models/advtrains_dtrack_st_45.b3d
diff --git a/advtrains/advtrains/models/advtrains_dtrack_st_60.b3d b/advtrains/advtrains/models/advtrains_dtrack_st_60.b3d
new file mode 100644
index 0000000..6cb19e6
--- /dev/null
+++ b/advtrains/advtrains/models/advtrains_dtrack_st_60.b3d
diff --git a/advtrains/advtrains/models/advtrains_dtrack_swlcr.b3d b/advtrains/advtrains/models/advtrains_dtrack_swlcr.b3d
new file mode 100644
index 0000000..8b1ac0e
--- /dev/null
+++ b/advtrains/advtrains/models/advtrains_dtrack_swlcr.b3d
diff --git a/advtrains/advtrains/models/advtrains_dtrack_swlcr_30.b3d b/advtrains/advtrains/models/advtrains_dtrack_swlcr_30.b3d
new file mode 100644
index 0000000..6def7ab
--- /dev/null
+++ b/advtrains/advtrains/models/advtrains_dtrack_swlcr_30.b3d
diff --git a/advtrains/advtrains/models/advtrains_dtrack_swlcr_45.b3d b/advtrains/advtrains/models/advtrains_dtrack_swlcr_45.b3d
new file mode 100644
index 0000000..cc874ca
--- /dev/null
+++ b/advtrains/advtrains/models/advtrains_dtrack_swlcr_45.b3d
diff --git a/advtrains/advtrains/models/advtrains_dtrack_swlcr_60.b3d b/advtrains/advtrains/models/advtrains_dtrack_swlcr_60.b3d
new file mode 100644
index 0000000..1472a00
--- /dev/null
+++ b/advtrains/advtrains/models/advtrains_dtrack_swlcr_60.b3d
diff --git a/advtrains/advtrains/models/advtrains_dtrack_swlst.b3d b/advtrains/advtrains/models/advtrains_dtrack_swlst.b3d
new file mode 100644
index 0000000..ecdb326
--- /dev/null
+++ b/advtrains/advtrains/models/advtrains_dtrack_swlst.b3d
diff --git a/advtrains/advtrains/models/advtrains_dtrack_swlst_30.b3d b/advtrains/advtrains/models/advtrains_dtrack_swlst_30.b3d
new file mode 100644
index 0000000..fd6e91d
--- /dev/null
+++ b/advtrains/advtrains/models/advtrains_dtrack_swlst_30.b3d
diff --git a/advtrains/advtrains/models/advtrains_dtrack_swlst_45.b3d b/advtrains/advtrains/models/advtrains_dtrack_swlst_45.b3d
new file mode 100644
index 0000000..dae694e
--- /dev/null
+++ b/advtrains/advtrains/models/advtrains_dtrack_swlst_45.b3d
diff --git a/advtrains/advtrains/models/advtrains_dtrack_swlst_60.b3d b/advtrains/advtrains/models/advtrains_dtrack_swlst_60.b3d
new file mode 100644
index 0000000..8f2b0e2
--- /dev/null
+++ b/advtrains/advtrains/models/advtrains_dtrack_swlst_60.b3d
diff --git a/advtrains/advtrains/models/advtrains_dtrack_swrcr.b3d b/advtrains/advtrains/models/advtrains_dtrack_swrcr.b3d
new file mode 100644
index 0000000..4610826
--- /dev/null
+++ b/advtrains/advtrains/models/advtrains_dtrack_swrcr.b3d
diff --git a/advtrains/advtrains/models/advtrains_dtrack_swrcr_30.b3d b/advtrains/advtrains/models/advtrains_dtrack_swrcr_30.b3d
new file mode 100644
index 0000000..71b87f3
--- /dev/null
+++ b/advtrains/advtrains/models/advtrains_dtrack_swrcr_30.b3d
diff --git a/advtrains/advtrains/models/advtrains_dtrack_swrcr_45.b3d b/advtrains/advtrains/models/advtrains_dtrack_swrcr_45.b3d
new file mode 100644
index 0000000..5457972
--- /dev/null
+++ b/advtrains/advtrains/models/advtrains_dtrack_swrcr_45.b3d
diff --git a/advtrains/advtrains/models/advtrains_dtrack_swrcr_60.b3d b/advtrains/advtrains/models/advtrains_dtrack_swrcr_60.b3d
new file mode 100644
index 0000000..167a3ff
--- /dev/null
+++ b/advtrains/advtrains/models/advtrains_dtrack_swrcr_60.b3d
diff --git a/advtrains/advtrains/models/advtrains_dtrack_swrst.b3d b/advtrains/advtrains/models/advtrains_dtrack_swrst.b3d
new file mode 100644
index 0000000..69b6996
--- /dev/null
+++ b/advtrains/advtrains/models/advtrains_dtrack_swrst.b3d
diff --git a/advtrains/advtrains/models/advtrains_dtrack_swrst_30.b3d b/advtrains/advtrains/models/advtrains_dtrack_swrst_30.b3d
new file mode 100644
index 0000000..19ee483
--- /dev/null
+++ b/advtrains/advtrains/models/advtrains_dtrack_swrst_30.b3d
diff --git a/advtrains/advtrains/models/advtrains_dtrack_swrst_45.b3d b/advtrains/advtrains/models/advtrains_dtrack_swrst_45.b3d
new file mode 100644
index 0000000..70d051f
--- /dev/null
+++ b/advtrains/advtrains/models/advtrains_dtrack_swrst_45.b3d
diff --git a/advtrains/advtrains/models/advtrains_dtrack_swrst_60.b3d b/advtrains/advtrains/models/advtrains_dtrack_swrst_60.b3d
new file mode 100644
index 0000000..69a58fb
--- /dev/null
+++ b/advtrains/advtrains/models/advtrains_dtrack_swrst_60.b3d
diff --git a/advtrains/advtrains/models/advtrains_dtrack_vst1.obj b/advtrains/advtrains/models/advtrains_dtrack_vst1.obj
new file mode 100644
index 0000000..33d9bf3
--- /dev/null
+++ b/advtrains/advtrains/models/advtrains_dtrack_vst1.obj
@@ -0,0 +1,348 @@
+# Blender v2.78 (sub 0) OBJ File: 'rail_redo.blend'
+# www.blender.org
+o dtrack_vst1_Cube.031
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+vn 0.0000 -0.8944 0.4472
+vn 0.0000 -1.0000 0.0000
+g dtrack_vst1_Cube.031_SlopeRailMaterial
+s off
+f 8/1/1 10/2/1 9/3/1 7/4/1
+f 10/2/2 14/5/2 13/6/2 9/7/2
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diff --git a/advtrains/advtrains/models/advtrains_dtrack_vst1_45.obj b/advtrains/advtrains/models/advtrains_dtrack_vst1_45.obj
new file mode 100644
index 0000000..8ff8343
--- /dev/null
+++ b/advtrains/advtrains/models/advtrains_dtrack_vst1_45.obj
@@ -0,0 +1,434 @@
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diff --git a/advtrains/advtrains/models/advtrains_dtrack_vst2.obj b/advtrains/advtrains/models/advtrains_dtrack_vst2.obj
new file mode 100644
index 0000000..444ce42
--- /dev/null
+++ b/advtrains/advtrains/models/advtrains_dtrack_vst2.obj
@@ -0,0 +1,372 @@
+# Blender v2.78 (sub 0) OBJ File: 'rail_redo.blend'
+# www.blender.org
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diff --git a/advtrains/advtrains/models/advtrains_dtrack_vst2_45.obj b/advtrains/advtrains/models/advtrains_dtrack_vst2_45.obj
new file mode 100644
index 0000000..5dc708b
--- /dev/null
+++ b/advtrains/advtrains/models/advtrains_dtrack_vst2_45.obj
@@ -0,0 +1,462 @@
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new file mode 100644
index 0000000..c4cb84f
--- /dev/null
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diff --git a/advtrains/advtrains/models/advtrains_dtrack_vst32.obj b/advtrains/advtrains/models/advtrains_dtrack_vst32.obj
new file mode 100644
index 0000000..297d46b
--- /dev/null
+++ b/advtrains/advtrains/models/advtrains_dtrack_vst32.obj
@@ -0,0 +1,372 @@
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diff --git a/advtrains/advtrains/models/advtrains_dtrack_vst33.obj b/advtrains/advtrains/models/advtrains_dtrack_vst33.obj
new file mode 100644
index 0000000..8cb5f04
--- /dev/null
+++ b/advtrains/advtrains/models/advtrains_dtrack_vst33.obj
@@ -0,0 +1,388 @@
+# Blender v2.78 (sub 0) OBJ File: 'rail_redo.blend'
+# www.blender.org
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+s off
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diff --git a/advtrains/advtrains/models/advtrains_modernwagon.b3d b/advtrains/advtrains/models/advtrains_modernwagon.b3d
new file mode 100644
index 0000000..aacddca
--- /dev/null
+++ b/advtrains/advtrains/models/advtrains_modernwagon.b3d
diff --git a/advtrains/advtrains/models/advtrains_platform_diag.b3d b/advtrains/advtrains/models/advtrains_platform_diag.b3d
new file mode 100644
index 0000000..9464e63
--- /dev/null
+++ b/advtrains/advtrains/models/advtrains_platform_diag.b3d
diff --git a/advtrains/advtrains/models/advtrains_platform_diag_low.b3d b/advtrains/advtrains/models/advtrains_platform_diag_low.b3d
new file mode 100644
index 0000000..5a8054b
--- /dev/null
+++ b/advtrains/advtrains/models/advtrains_platform_diag_low.b3d
diff --git a/advtrains/advtrains/models/advtrains_retrosignal_off.b3d b/advtrains/advtrains/models/advtrains_retrosignal_off.b3d
new file mode 100644
index 0000000..3d231dd
--- /dev/null
+++ b/advtrains/advtrains/models/advtrains_retrosignal_off.b3d
diff --git a/advtrains/advtrains/models/advtrains_retrosignal_off_30.b3d b/advtrains/advtrains/models/advtrains_retrosignal_off_30.b3d
new file mode 100644
index 0000000..da258e1
--- /dev/null
+++ b/advtrains/advtrains/models/advtrains_retrosignal_off_30.b3d
diff --git a/advtrains/advtrains/models/advtrains_retrosignal_off_45.b3d b/advtrains/advtrains/models/advtrains_retrosignal_off_45.b3d
new file mode 100644
index 0000000..338224a
--- /dev/null
+++ b/advtrains/advtrains/models/advtrains_retrosignal_off_45.b3d
diff --git a/advtrains/advtrains/models/advtrains_retrosignal_off_60.b3d b/advtrains/advtrains/models/advtrains_retrosignal_off_60.b3d
new file mode 100644
index 0000000..c560ca1
--- /dev/null
+++ b/advtrains/advtrains/models/advtrains_retrosignal_off_60.b3d
diff --git a/advtrains/advtrains/models/advtrains_retrosignal_on.b3d b/advtrains/advtrains/models/advtrains_retrosignal_on.b3d
new file mode 100644
index 0000000..3d19439
--- /dev/null
+++ b/advtrains/advtrains/models/advtrains_retrosignal_on.b3d
diff --git a/advtrains/advtrains/models/advtrains_retrosignal_on_30.b3d b/advtrains/advtrains/models/advtrains_retrosignal_on_30.b3d
new file mode 100644
index 0000000..98f8a92
--- /dev/null
+++ b/advtrains/advtrains/models/advtrains_retrosignal_on_30.b3d
diff --git a/advtrains/advtrains/models/advtrains_retrosignal_on_45.b3d b/advtrains/advtrains/models/advtrains_retrosignal_on_45.b3d
new file mode 100644
index 0000000..414e121
--- /dev/null
+++ b/advtrains/advtrains/models/advtrains_retrosignal_on_45.b3d
diff --git a/advtrains/advtrains/models/advtrains_retrosignal_on_60.b3d b/advtrains/advtrains/models/advtrains_retrosignal_on_60.b3d
new file mode 100644
index 0000000..a51529a
--- /dev/null
+++ b/advtrains/advtrains/models/advtrains_retrosignal_on_60.b3d
diff --git a/advtrains/advtrains/models/advtrains_signal.b3d b/advtrains/advtrains/models/advtrains_signal.b3d
new file mode 100644
index 0000000..7f69560
--- /dev/null
+++ b/advtrains/advtrains/models/advtrains_signal.b3d
diff --git a/advtrains/advtrains/models/advtrains_signal_30.b3d b/advtrains/advtrains/models/advtrains_signal_30.b3d
new file mode 100644
index 0000000..0b949a7
--- /dev/null
+++ b/advtrains/advtrains/models/advtrains_signal_30.b3d
diff --git a/advtrains/advtrains/models/advtrains_signal_45.b3d b/advtrains/advtrains/models/advtrains_signal_45.b3d
new file mode 100644
index 0000000..ccaebf4
--- /dev/null
+++ b/advtrains/advtrains/models/advtrains_signal_45.b3d
diff --git a/advtrains/advtrains/models/advtrains_signal_60.b3d b/advtrains/advtrains/models/advtrains_signal_60.b3d
new file mode 100644
index 0000000..cf41e6d
--- /dev/null
+++ b/advtrains/advtrains/models/advtrains_signal_60.b3d
diff --git a/advtrains/advtrains/models/advtrains_signal_wall_l.b3d b/advtrains/advtrains/models/advtrains_signal_wall_l.b3d
new file mode 100644
index 0000000..b1bcbcf
--- /dev/null
+++ b/advtrains/advtrains/models/advtrains_signal_wall_l.b3d
diff --git a/advtrains/advtrains/models/advtrains_signal_wall_r.b3d b/advtrains/advtrains/models/advtrains_signal_wall_r.b3d
new file mode 100644
index 0000000..cf26389
--- /dev/null
+++ b/advtrains/advtrains/models/advtrains_signal_wall_r.b3d
diff --git a/advtrains/advtrains/models/advtrains_signal_wall_t.b3d b/advtrains/advtrains/models/advtrains_signal_wall_t.b3d
new file mode 100644
index 0000000..30e77f6
--- /dev/null
+++ b/advtrains/advtrains/models/advtrains_signal_wall_t.b3d
diff --git a/advtrains/advtrains/models/advtrains_track_cr.b3d b/advtrains/advtrains/models/advtrains_track_cr.b3d
new file mode 100644
index 0000000..b0f5e4b
--- /dev/null
+++ b/advtrains/advtrains/models/advtrains_track_cr.b3d
diff --git a/advtrains/advtrains/models/advtrains_track_st.b3d b/advtrains/advtrains/models/advtrains_track_st.b3d
new file mode 100644
index 0000000..10b5d90
--- /dev/null
+++ b/advtrains/advtrains/models/advtrains_track_st.b3d
diff --git a/advtrains/advtrains/models/advtrains_track_st_45.b3d b/advtrains/advtrains/models/advtrains_track_st_45.b3d
new file mode 100644
index 0000000..32505a1
--- /dev/null
+++ b/advtrains/advtrains/models/advtrains_track_st_45.b3d
diff --git a/advtrains/advtrains/models/trackplane.b3d b/advtrains/advtrains/models/trackplane.b3d
new file mode 100644
index 0000000..b4728c3
--- /dev/null
+++ b/advtrains/advtrains/models/trackplane.b3d
diff --git a/advtrains/advtrains/nodedb.lua b/advtrains/advtrains/nodedb.lua
new file mode 100644
index 0000000..03a5a2d
--- /dev/null
+++ b/advtrains/advtrains/nodedb.lua
@@ -0,0 +1,343 @@
+--nodedb.lua
+--database of all nodes that have 'save_in_at_nodedb' field set to true in node definition
+
+
+--serialization format:
+--(2byte z) (2byte y) (2byte x) (2byte contentid)
+--contentid := (14bit nodeid, 2bit param2)
+
+local function int_to_bytes(i)
+	local x=i+32768--clip to positive integers
+	local cH = math.floor(x /           256) % 256;
+	local cL = math.floor(x                ) % 256;
+	return(string.char(cH, cL));
+end
+local function bytes_to_int(bytes)
+	local t={string.byte(bytes,1,-1)}
+	local n = 
+		t[1] *           256 +
+		t[2]
+    return n-32768
+end
+local function l2b(x)
+	return x%4
+end
+local function u14b(x)
+	return math.floor(x/4)
+end
+local ndb={}
+
+--local variables for performance
+local ndb_nodeids={}
+local ndb_nodes={}
+local ndb_ver
+
+local function ndbget(x,y,z)
+	local ny=ndb_nodes[y]
+	if ny then
+		local nx=ny[x]
+		if nx then
+			return nx[z]
+		end
+	end
+	return nil
+end
+local function ndbset(x,y,z,v)
+	if not ndb_nodes[y] then
+		ndb_nodes[y]={}
+	end
+	if not ndb_nodes[y][x] then
+		ndb_nodes[y][x]={}
+	end
+	ndb_nodes[y][x][z]=v
+end
+
+
+local path=minetest.get_worldpath()..DIR_DELIM.."advtrains_ndb2"
+--load
+--nodeids get loaded by advtrains init.lua and passed here
+function ndb.load_data(data)
+	ndb_nodeids = data and data.nodeids or {}
+	ndb_ver = data and data.ver or 0
+	if ndb_ver < 1 then
+		for k,v in pairs(ndb_nodeids) do
+			if v == "advtrains:dtrack_xing4590_st" then
+				cidDepr = k
+			elseif v == "advtrains:dtrack_xing90plusx_45l" then
+				cidNew = k
+			end
+		end
+	end
+	local file, err = io.open(path, "rb")
+	if not file then
+		atwarn("Couldn't load the node database: ", err or "Unknown Error")
+	else
+		local cnt=0
+		local hst_z=file:read(2)
+		local hst_y=file:read(2)
+		local hst_x=file:read(2)
+		local cid=file:read(2)
+		while hst_z and hst_y and hst_x and cid and #hst_z==2 and #hst_y==2 and #hst_x==2 and #cid==2 do
+			if (ndb_ver < 1 and cid == cidDepr) then
+				cid = cidNew
+			end
+			ndbset(bytes_to_int(hst_x), bytes_to_int(hst_y), bytes_to_int(hst_z), bytes_to_int(cid))
+			cnt=cnt+1
+			hst_z=file:read(2)
+			hst_y=file:read(2)
+			hst_x=file:read(2)
+			cid=file:read(2)
+		end
+		atlog("nodedb: read", cnt, "nodes.")
+		file:close()
+	end
+	ndb_ver = 1
+end
+
+local windows_compat = false
+--save
+function ndb.save_data()
+	local tmppath = path.."~"
+	local file, err
+	if windows_compat then
+		-- open ndb file directly
+		file, err = io.open(path, "wb")
+	else
+		-- open another file next to it, then replace atomically
+		file, err = io.open(tmppath, "wb")
+	end
+	
+	if not file then
+		atwarn("Couldn't save the node database: ", err or "Unknown Error")
+	else
+		for y, ny in pairs(ndb_nodes) do
+			for x, nx in pairs(ny) do
+				for z, cid in pairs(nx) do
+					file:write(int_to_bytes(z))
+					file:write(int_to_bytes(y))
+					file:write(int_to_bytes(x))
+					file:write(int_to_bytes(cid))
+				end
+			end
+		end
+		file:close()
+	end
+	
+	if not windows_compat then
+		local success, msg = os.rename(tmppath, path)
+		--local success, msg = nil, "test"
+		-- for windows, this fails if the file already exists. Enable windows compatibility and directly write to path.
+		if not success then
+			atlog("Replacing the nodedb file atomically failed:",msg)
+			atlog("Switching to Windows mode (will directly overwrite the nodedb file from now on)")
+			windows_compat = true
+			os.remove(tmppath)
+			-- try again
+			ndb.save_data()
+		end
+	end
+	
+	return {nodeids = ndb_nodeids, ver = ndb_ver}
+end
+
+--function to get node. track database is not helpful here.
+function ndb.get_node_or_nil(pos)
+	-- FIX for bug found on linuxworks server:
+	-- a loaded node might get read before the LBM has updated its state, resulting in wrongly set signals and switches
+	-- -> Using the saved node prioritarily.
+	local node = ndb.get_node_raw(pos)
+	if node then
+		return node
+	else
+		--try reading the node from the map
+		return minetest.get_node_or_nil(pos)
+	end
+end
+function ndb.get_node(pos)
+	local n=ndb.get_node_or_nil(pos)
+	if not n then
+		return {name="ignore", param2=0}
+	end
+	return n
+end
+function ndb.get_node_raw(pos)
+	local cid=ndbget(pos.x, pos.y, pos.z)
+	if cid then
+		local nodeid = ndb_nodeids[u14b(cid)]
+		if nodeid then
+			return {name=nodeid, param2 = l2b(cid)}
+		end
+	end
+	return nil
+end
+
+
+function ndb.swap_node(pos, node, no_inval)
+	if minetest.get_node_or_nil(pos) then
+		minetest.swap_node(pos, node)
+	end
+	ndb.update(pos, node)
+end
+
+function ndb.update(pos, pnode)
+	local node = pnode or minetest.get_node_or_nil(pos)
+	if not node or node.name=="ignore" then return end
+	if minetest.registered_nodes[node.name] and minetest.registered_nodes[node.name].groups.save_in_at_nodedb then
+		local nid
+		for tnid, nname in pairs(ndb_nodeids) do
+			if nname==node.name then
+				nid=tnid
+			end
+		end
+		if not nid then
+			nid=#ndb_nodeids+1
+			ndb_nodeids[nid]=node.name
+		end
+		local resid = (nid * 4) + (l2b(node.param2 or 0))
+		ndbset(pos.x, pos.y, pos.z, resid )
+		--atdebug("nodedb: updating node", pos, "stored nid",nid,"assigned",ndb_nodeids[nid],"resulting cid",resid)
+		minetest.after(0, advtrains.invalidate_all_paths, pos)
+	else
+		--at this position there is no longer a node that needs to be tracked.
+		--atdebug("nodedb: updating node", pos, "cleared")
+		ndbset(pos.x, pos.y, pos.z, nil)
+	end
+end
+
+function ndb.clear(pos)
+	ndbset(pos.x, pos.y, pos.z, nil)
+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.
+--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)
+	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
+		return false
+	end
+	local conns, railheight, tracktype=advtrains.get_track_connections(node.name, node.param2)
+	
+	return true, conns, railheight
+end
+
+ndb.run_lbm = function(pos, node)
+	return advtrains.pcall(function()
+		local cid=ndbget(pos.x, pos.y, pos.z)
+		if cid then
+			--if in database, detect changes and apply.
+			local nodeid = ndb_nodeids[u14b(cid)]
+			local param2 = l2b(cid)
+			if not nodeid then
+				--something went wrong
+				atwarn("Node Database corruption, couldn't determine node to set at", pos)
+				ndb.update(pos, node)
+			else
+				if (nodeid~=node.name or param2~=node.param2) then
+					atprint("nodedb: lbm replaced", pos, "with nodeid", nodeid, "param2", param2, "cid is", cid)
+					minetest.swap_node(pos, {name=nodeid, param2 = param2})
+					local ndef=minetest.registered_nodes[nodeid]
+					if ndef and ndef.on_updated_from_nodedb then
+						ndef.on_updated_from_nodedb(pos, node)
+					end
+					return true
+				end
+			end
+		else
+			--if not in database, take it.
+			--atlog("Node Database:", pos, "was not found in the database, have you used worldedit?")
+			ndb.update(pos, node)
+		end
+		return false
+	end)
+end
+
+
+minetest.register_lbm({
+        name = "advtrains:nodedb_on_load_update",
+        nodenames = {"group:save_in_at_nodedb"},
+        run_at_every_load = true,
+        run_on_every_load = true,
+        action = ndb.run_lbm,
+        interval=30,
+        chance=1,
+    })
+
+--used when restoring stuff after a crash
+ndb.restore_all = function()
+	--atlog("Updating the map from the nodedb, this may take a while")
+	local cnt=0
+	local dcnt=0
+	for y, ny in pairs(ndb_nodes) do
+		for x, nx in pairs(ny) do
+			for z, _ in pairs(nx) do
+				local pos={x=x, y=y, z=z}
+				local node=minetest.get_node_or_nil(pos)
+				if node then
+					local ori_ndef=minetest.registered_nodes[node.name]
+					local ndbnode=ndb.get_node_raw(pos)
+					if ori_ndef and ori_ndef.groups.save_in_at_nodedb then --check if this node has been worldedited, and don't replace then
+						if (ndbnode.name~=node.name or ndbnode.param2~=node.param2) then
+							minetest.swap_node(pos, ndbnode)
+							--atlog("Replaced",node.name,"@",pos,"with",ndbnode.name)
+							cnt=cnt+1
+						end
+					else
+						ndb.clear(pos)
+						dcnt=dcnt+1
+						--atlog("Found ghost node (former",ndbnode and ndbnode.name,") @",pos,"deleting")
+					end
+				end
+			end
+		end
+	end
+	local text="Restore node database: Replaced "..cnt.." nodes, removed "..dcnt.." ghost nodes."
+	atlog(text)
+	return text
+end
+    
+minetest.register_on_dignode(function(pos, oldnode, digger)
+	return advtrains.pcall(function()
+		ndb.clear(pos)
+	end)
+end)
+
+function ndb.get_nodes()
+	return ndb_nodes
+end
+function ndb.get_nodeids()
+	return ndb_nodeids
+end
+
+
+advtrains.ndb=ndb
+
+local ptime=0
+
+minetest.register_chatcommand("at_sync_ndb",
+	{
+        params = "", -- Short parameter description
+        description = "Write node db back to map and find ghost nodes", -- Full description
+        privs = {train_operator=true}, 
+        func = function(name, param)
+			return advtrains.pcall(function()
+				if os.time() < ptime+30 then
+					return false, "Please wait at least 30s from the previous execution of /at_restore_ndb!"
+				end
+				local text = ndb.restore_all()
+				ptime=os.time()
+				return true, text
+			end)
+        end,
+    })
+
diff --git a/advtrains/advtrains/occupation.lua b/advtrains/advtrains/occupation.lua
new file mode 100644
index 0000000..da60278
--- /dev/null
+++ b/advtrains/advtrains/occupation.lua
@@ -0,0 +1,207 @@
+-- occupation.lua
+--[[
+Collects and manages positions where trains occupy and/or reserve/require space
+
+It turned out that, especially for the TSS, some more, even overlapping zones are required.
+Packing those into a data structure would just become a huge mess!
+Instead, this occupation system will store the path indices of positions in the corresponding.
+train's paths.
+So, the occupation is a reverse lookup of paths.
+Then, a callback system will handle changes in those indices, as follows:
+
+Whenever the train generates new path items (path_get/path_create), their counterpart indices will be filled in here.
+Whenever a path gets invalidated or path items are deleted, their index counterpart is erased from here.
+
+When a train needs to know whether a position is blocked by another train, it will (and is permitted to)
+query the train.index and train.end_index and compare them to the blocked position's index.
+
+Callback system for 3rd-party path checkers:
+advtrains.te_register_on_new_path(func(id, train))
+-- Called when a train's path is re-initalized, either when it was invalidated
+-- or the saves were just loaded
+-- It can be assumed that everything is in the state of when the last run
+-- of on_update was made, but all indices are shifted by an unknown amount.
+
+advtrains.te_register_on_update(func(id, train))
+-- Called each step and after a train moved, its length changed or some other event occured
+-- The path is unmodified, and train.index and train.end_index can be reliably
+-- queried for the new position and length of the train.
+-- note that this function might be called multiple times per step, and this 
+-- function being called does not necessarily mean that something has changed.
+-- It is ensured that on_new_path callbacks are executed prior to these callbacks whenever
+-- an invalidation or a reload occured.
+
+advtrains.te_register_on_create(func(id, train))
+-- Called right after a train is created, right after the initial new_path callback
+advtrains.te_register_on_remove(func(id, train))
+-- Called right before a train is deleted
+
+
+All callbacks are allowed to save certain values inside the train table, but they must ensure that
+those are reinitialized in the on_new_path callback. The on_new_path callback must explicitly
+set ALL OF those values to nil or to a new updated value, and must not rely on their existence.
+
+]]--
+local o = {}
+
+local occ = {}
+local occ_chg = {}
+
+
+local function occget(p)
+	local t = occ[p.y]
+	if not t then
+		occ[p.y] = {}
+		t = occ[p.y]
+	end
+	local s = t
+	t = t[p.x]
+	if not t then
+		s[p.x] = {}
+		t = s[p.x]
+	end
+	return t[p.z]
+end
+local function occgetcreate(p)
+	local t = occ[p.y]
+	if not t then
+		occ[p.y] = {}
+		t = occ[p.y]
+	end
+	local s = t
+	t = t[p.x]
+	if not t then
+		s[p.x] = {}
+		t = s[p.x]
+	end
+	s = t
+	t = t[p.z]
+	if not t then
+		s[p.z] = {}
+		t = s[p.z]
+	end
+	return t
+end
+
+
+function o.set_item(train_id, pos, idx)
+	local t = occgetcreate(pos)
+	local i = 1
+	while t[i] do
+		if t[i]==train_id then
+			break
+		end
+		i = i + 2
+	end
+	t[i] = train_id
+	t[i+1] = idx
+end
+
+
+function o.clear_item(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
+		end
+		if moving then
+			t[i]   = t[i+2]
+			t[i+1] = t[i+3]
+		end
+		i = i + 2
+	end
+end
+
+-- Checks whether some other train (apart from train_id) has it's 0 zone here
+function o.check_collision(pos, train_id)
+	local npos = advtrains.round_vector_floor_y(pos)
+	local t = occget(npos)
+	if not t then return end
+	local i = 1
+	while t[i] do
+		local ti = t[i]
+		if ti~=train_id then
+			local idx = t[i+1]
+			local train = advtrains.trains[ti]
+			
+			--atdebug("checking train",t[i],"index",idx,"<>",train.index,train.end_index)
+			if train and idx >= train.end_index and idx <= train.index then
+				--atdebug("collides.")				
+				return train -- return train it collided with so we can couple when shunting is enabled
+			end
+		end
+		i = i + 2
+	end
+	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
+	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
+		i = i + 2
+	end
+	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)
+	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
+		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 r = {}
+	local i = 1
+	while t[i] do
+		local train = advtrains.trains[t[i]]
+		local idx = t[i+1]
+		r[t[i]] = idx
+		i = i + 2
+	end
+	return r
+end
+
+advtrains.occ = o
diff --git a/advtrains/advtrains/p_mesecon_iface.lua b/advtrains/advtrains/p_mesecon_iface.lua
new file mode 100644
index 0000000..87e1c6d
--- /dev/null
+++ b/advtrains/advtrains/p_mesecon_iface.lua
@@ -0,0 +1,54 @@
+-- p_mesecon_iface.lua
+-- Mesecons interface by overriding the switch
+
+if not mesecon then return end
+
+minetest.override_item("mesecons_switch:mesecon_switch_off", {
+	groups = {
+		dig_immediate=2,
+		save_in_nodedb=1,
+	},
+	on_rightclick = function (pos, node)
+		advtrains.ndb.swap_node(pos, {name="mesecons_switch:mesecon_switch_on", param2=node.param2})
+		mesecon.receptor_on(pos)
+		minetest.sound_play("mesecons_switch", {pos=pos})
+	end,
+	on_updated_from_nodedb = function(pos, node)
+		mesecon.receptor_off(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})
+				mesecon.receptor_on(pos)
+			end
+		end,
+	},
+})
+
+minetest.override_item("mesecons_switch:mesecon_switch_on", {
+	groups = {
+		dig_immediate=2,
+		save_in_nodedb=1,
+		not_in_creative_inventory=1,
+	},
+	on_rightclick = function (pos, node)
+		advtrains.ndb.swap_node(pos, {name="mesecons_switch:mesecon_switch_off", param2=node.param2})
+		mesecon.receptor_off(pos)
+		minetest.sound_play("mesecons_switch", {pos=pos})
+	end,
+	on_updated_from_nodedb = function(pos, node)
+		mesecon.receptor_on(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})
+				mesecon.receptor_off(pos)
+			end
+		end,
+		fallback_state = "off",
+	},
+})
diff --git a/advtrains/advtrains/passive.lua b/advtrains/advtrains/passive.lua
new file mode 100644
index 0000000..fe4790c
--- /dev/null
+++ b/advtrains/advtrains/passive.lua
@@ -0,0 +1,121 @@
+-- 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 = {}
+
+function advtrains.getstate(parpos, pnode)
+	local pos
+	if atlatc then
+		pos = atlatc.pcnaming.resolve_pos(parpos)
+	else
+		pos = advtrains.round_vector_floor_y(parpos)
+	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")
+	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.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
+	end
+end
+
+function advtrains.setstate(parpos, newstate, pnode)
+	local pos
+	if atlatc then
+		pos = atlatc.pcnaming.resolve_pos(parpos)
+	else
+		pos = advtrains.round_vector_floor_y(parpos)
+	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")
+	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
+	end
+	
+	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
+	
+	st(pos, node, newstate)
+	return true
+end
+
+function advtrains.is_passive(parpos, pnode)
+	local pos
+	if atlatc then
+		pos = atlatc.pcnaming.resolve_pos(parpos)
+	else
+		pos = advtrains.round_vector_floor_y(parpos)
+	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")
+	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
+		return true
+	else
+		return false
+	end
+end
+
+-- switches a node back to fallback state, if defined. Doesn't support pcnaming.
+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
+	
+	
+end
diff --git a/advtrains/advtrains/path.lua b/advtrains/advtrains/path.lua
new file mode 100644
index 0000000..ee82c06
--- /dev/null
+++ b/advtrains/advtrains/path.lua
@@ -0,0 +1,377 @@
+-- path.lua
+-- Functions for pathpredicting, put in a separate file. 
+
+-- Naming conventions:
+-- 'index' - An index of the train.path table.
+-- 'offset' - A value in meters that determines how far on the path to walk relative to a certain index
+-- 'n' - Referring or pointing towards the 'next' path item, the one with index+1
+-- 'p' - Referring or pointing towards the 'prev' path item, the one with index-1
+-- 'f' - Referring to the positive end of the path (the end with the higher index)
+-- 'b' - Referring to the negative end of the path (the end with the lower index)
+
+-- New path structure of trains:
+--Tables:
+-- path      - path positions. 'indices' are relative to this. At the moment, at.round_vector_floor_y(path[i])
+--              is the node this item corresponds to, however, this will change in the future.
+-- path_node - (reserved)
+-- path_cn   - Connid of the current node that points towards path[i+1]
+-- path_cp   - Connid of the current node that points towards path[i-1]
+--     When the day comes on that path!=node, these will only be set if this index represents a transition between rail nodes
+-- path_dist - The total distance of this path element from path element 0
+-- path_dir  - The direction of this path item's transition to the next path item, which is the angle of conns[path_cn[i]].c
+--Variables:
+-- path_ext_f/b - how far path[i] is set
+-- path_trk_f/b - how far the path extends along a track. beyond those values, paths are generated in a straight line.
+-- path_req_f/b - how far path items were requested in the last step
+--
+--Distance and index:
+-- There is an important difference between the path index and the actual distance on the track: The distance between two path items can be larger than 1,
+-- but the corresponding index increment is still 1.
+-- Indexes in advtrains can be fractional values. If they are, it means that the actual position is interpolated between the 2 adjacent path items.
+-- 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)
+	if not node_ok then
+		return node_ok
+	end
+	local mconnid = advtrains.get_matching_conn(connid, #conns)
+	train.index = rel_index
+	train.path = { [0] = { x=posr.x, y=posr.y+rhe, z=posr.z } }
+	train.path_cn = { [0] = connid }
+	train.path_cp = { [0] = mconnid }
+	train.path_dist = { [0] = 0 }
+	
+	train.path_dir = {
+		[0] = advtrains.conn_angle_median(conns[mconnid].c, conns[connid].c)
+	}
+	
+	train.path_ext_f=0
+	train.path_ext_b=0
+	train.path_trk_f=0
+	train.path_trk_b=0
+	train.path_req_f=0
+	train.path_req_b=0
+	
+	advtrains.occ.set_item(train.id, posr, 0)
+	return true
+end
+
+-- Sets position and connid to properly restore after a crash, e.g. in order
+-- to save the train or to invalidate its path
+-- Assumes that the train is in clean state
+-- if invert ist true, setrestore will use the end index
+function advtrains.path_setrestore(train, invert)
+	local idx = train.index
+	if invert then
+		idx = train.end_index
+	end
+	
+	local pos, connid, frac = advtrains.path_getrestore(train, idx, invert, true)
+	
+	train.last_pos = pos
+	train.last_connid = connid
+	train.last_frac = frac
+end
+-- Get restore position, connid and frac (in this order) for a train that will originate at the passed index
+-- If invert is set, it will return path_cp and multiply frac by -1, in order to reverse the train there.
+function advtrains.path_getrestore(train, index, invert)
+	local idx = index
+	local cns = train.path_cn
+	
+	if invert then
+		cns = train.path_cp
+	end
+	
+	local fli = atfloor(index)
+	advtrains.path_get(train, fli)
+	if fli > train.path_trk_f then
+		fli = train.path_trk_f
+	end
+	if fli < train.path_trk_b then
+		fli = train.path_trk_b
+	end
+	return advtrains.path_get(train, fli),
+			cns[fli],
+			(idx - fli) * (invert and -1 or 1)
+end
+
+-- Invalidates a path
+-- this is supposed to clear stuff from the occupation tables
+-- This function throws a warning whenever any code calls it while the train steps are run, since that must not happen.
+-- The ignore_lock parameter can be used to ignore this, however, it should then be accompanied by a call to train_ensure_init
+-- 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(debug.traceback())
+	end
+
+	if train.path then
+		for i,p in pairs(train.path) do
+			advtrains.occ.clear_item(train.id, advtrains.round_vector_floor_y(p))
+		end
+	end
+	train.path = nil
+	train.path_dist = nil
+	train.path_cp = nil
+	train.path_cn = nil
+	train.path_dir = nil
+	train.path_ext_f=0
+	train.path_ext_b=0
+	train.path_trk_f=0
+	train.path_trk_b=0
+	train.path_req_f=0
+	train.path_req_b=0
+	
+	train.dirty = true
+end
+
+-- Prints a path using the passed print function
+-- This function should be 'atprint', 'atlog', 'atwarn' or 'atdebug', because it needs to use print_concat_table
+function advtrains.path_print(train, printf)
+	printf("path_print: tid =",train.id," index =",train.index," end_index =",train.end_index," vel =",train.velocity)
+	if not train.path then
+		printf("path_print: Path is invalidated/inexistant.")
+		return
+	end
+	printf("i:	CP	Position	Dir	CN		Dist")
+	for i = train.path_ext_b, train.path_ext_f do
+		if i==train.path_trk_b then
+			printf("--Back on-track border here--")
+		end
+		printf(i,":	",train.path_cp[i],"	",train.path[i],"	",train.path_dir[i],"	",train.path_cn[i],"		",train.path_dist[i],"")
+		if i==train.path_trk_f then
+			printf("--Front on-track border here--")		
+		end
+	end
+end
+
+-- Function to get path entry at a position. This function will automatically calculate more of the path when required.
+-- returns: pos, on_track
+function advtrains.path_get(train, index)
+	if not train.path then
+		error("For train "..train.id..": path_get called but there's no path set yet!")
+	end
+	if index ~= atfloor(index) then
+		error("For train "..train.id..": Called path_get() but index="..index.." is not a round number")
+	end
+	
+	local pef = train.path_ext_f
+	-- generate forward (front of train, positive)
+	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
+		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)
+		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
+		
+			adj_pos.y = adj_pos.y + nextrail_y
+			train.path_cp[pef] = adj_connid
+			train.path_cn[pef] = mconnid
+			train.path_dir[pef] = advtrains.conn_angle_median(next_conns[adj_connid].c, next_conns[mconnid].c)
+			train.path_trk_f = pef
+		else
+			-- off-track fallback behavior
+			adj_pos = advtrains.pos_add_angle(pos, train.path_dir[pef-1])
+			--atdebug("Offtrack overgenerating(front) at",adj_pos,"index",peb,"trkf",train.path_trk_f)
+			train.path_dir[pef] = train.path_dir[pef-1]
+		end
+		train.path[pef] = adj_pos
+		train.path_dist[pef] = train.path_dist[pef-1] + vector.distance(pos, adj_pos)
+	end
+	train.path_ext_f = pef
+	
+	
+	local peb = train.path_ext_b
+	-- generate backward (back of train, negative)
+	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
+		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)
+		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
+			end
+			
+			adj_pos.y = adj_pos.y + nextrail_y
+			train.path_cn[peb] = adj_connid
+			train.path_cp[peb] = mconnid
+			train.path_dir[peb] = advtrains.conn_angle_median(next_conns[mconnid].c, next_conns[adj_connid].c)
+			train.path_trk_b = peb
+		else
+			-- off-track fallback behavior
+			adj_pos = advtrains.pos_add_angle(pos, train.path_dir[peb+1] + math.pi)
+			--atdebug("Offtrack overgenerating(back) at",adj_pos,"index",peb,"trkb",train.path_trk_b)
+			train.path_dir[peb] = train.path_dir[peb+1]
+		end
+		train.path[peb] = adj_pos
+		train.path_dist[peb] = train.path_dist[peb+1] - vector.distance(pos, adj_pos)
+	end
+	train.path_ext_b = peb
+	
+	if index < train.path_req_b then
+		train.path_req_b = index
+	end
+	if index > train.path_req_f then
+		train.path_req_f = index
+	end
+	
+	return train.path[index], (index<=train.path_trk_f and index>=train.path_trk_b)
+	
+end
+
+-- interpolated position to fractional index given, and angle based on path_dir
+-- returns: pos, angle(yaw), p_floor, p_ceil
+function advtrains.path_get_interpolated(train, index)
+	local i_floor = atfloor(index)
+	local i_ceil = i_floor + 1
+	local frac = index - i_floor
+	local p_floor = advtrains.path_get(train, i_floor)
+	local p_ceil = advtrains.path_get(train, i_ceil)
+	-- Note: minimal code duplication to path_get_adjacent, for performance
+	
+	local a_floor = train.path_dir[i_floor]
+	local a_ceil = train.path_dir[i_ceil]
+	
+	local ang = advtrains.minAngleDiffRad(a_floor, a_ceil)
+	
+	return vector.add(p_floor, vector.multiply(vector.subtract(p_ceil, p_floor), frac)), (a_floor + frac * ang)%(2*math.pi), p_floor, p_ceil
+end
+-- returns the 2 path positions directly adjacent to index and the fraction on how to interpolate between them
+-- returns: pos_floor, pos_ceil, fraction
+function advtrains.path_get_adjacent(train, index)
+	local i_floor = atfloor(index)
+	local i_ceil = i_floor + 1
+	local frac = index - i_floor
+	local p_floor = advtrains.path_get(train, i_floor)
+	local p_ceil = advtrains.path_get(train, i_ceil)
+	return p_floor, p_ceil, frac
+end
+
+local function n_interpolate(s, e, f)
+	return s + (e-s)*f
+end
+
+-- This function determines the index resulting from moving along the path by 'offset' meters
+-- starting from 'index'. See also the comment on the top of the file.
+function advtrains.path_get_index_by_offset(train, index, offset)
+	local advtrains_path_get = advtrains.path_get
+
+	-- Step 1: determine my current absolute pos on the path
+	local start_index_f = atfloor(index)
+	local end_index_f = start_index_f + 1
+	local c_idx = atfloor(index + offset)
+	local c_idx_f = c_idx + 1
+
+	local frac = index - start_index_f
+
+	advtrains_path_get(train, math.min(start_index_f, end_index_f, c_idx, c_idx_f))
+	advtrains_path_get(train, math.max(start_index_f, end_index_f, c_idx, c_idx_f))
+
+	local dist1, dist2 = train.path_dist[start_index_f], train.path_dist[start_index_f+1]
+	local start_dist = dist1 + (dist2-dist1)*frac
+	
+	-- Step 2: determine the total end distance and estimate the index we'd come out
+	local end_dist = start_dist + offset
+	
+	local c_idx = atfloor(index + offset)
+	
+	-- Step 3: move forward/backward to find real index
+	-- We assume here that the distance between 2 path items is never smaller than 1.
+	-- Our estimated index is therefore either exact or too far over, and we're going to go back
+	-- towards the origin. It is therefore sufficient to query path_get a single time
+	
+	-- How we'll adjust c_idx
+	--  Desired position:  -------#------
+	--  Path items      :  --|--|--|--|--
+	--  c_idx           :       ^
+
+	while train.path_dist[c_idx] < end_dist do
+		c_idx = c_idx + 1
+	end
+	
+	while train.path_dist[c_idx] > end_dist do
+		c_idx = c_idx - 1
+	end
+	
+	-- Step 4: now c_idx points to the place shown above. Find out the fractional part.
+	
+	dist1, dist2 = train.path_dist[c_idx], train.path_dist[c_idx+1]
+	
+	frac = (end_dist - dist1) / (dist2 - dist1)
+	
+	assert(frac>=0 and frac<1, frac)
+	
+	return c_idx + 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]))
+		train.path[i] = nil
+		train.path_dist[i-1] = nil
+		train.path_cp[i] = nil
+		train.path_cn[i] = nil
+		train.path_dir[i] = nil
+		train.path_ext_b = i + 1
+	end
+	
+	for i = train.path_ext_f,train.path_req_f + PATH_CLEAR_KEEP,-1 do
+		advtrains.occ.clear_item(train.id, advtrains.round_vector_floor_y(train.path[i]))
+		train.path[i] = nil
+		train.path_dist[i] = nil
+		train.path_cp[i] = nil
+		train.path_cn[i] = nil
+		train.path_dir[i+1] = nil
+		train.path_ext_f = i - 1
+	end
+	train.path_trk_b = math.max(train.path_trk_b, train.path_ext_b)
+	train.path_trk_f = math.min(train.path_trk_f, train.path_ext_f)
+	
+	train.path_req_f = math.ceil(train.index)
+	train.path_req_b = math.floor(train.end_index or train.index)
+end
+
+function advtrains.path_lookup(train, pos)
+	local cp = advtrains.round_vector_floor_y(pos)
+	for i = train.path_ext_b, train.path_ext_f do
+		if vector.equals(advtrains.round_vector_floor_y(train.path[i]), cp) then
+			return i
+		end
+	end
+	return nil
+end
diff --git a/advtrains/advtrains/protection.lua b/advtrains/advtrains/protection.lua
new file mode 100644
index 0000000..7474977
--- /dev/null
+++ b/advtrains/advtrains/protection.lua
@@ -0,0 +1,197 @@
+-- advtrains
+-- protection.lua: privileges and rail protection, and some helpers
+
+
+-- 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)",
+	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",
+	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",
+	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",
+	give_to_singleplayer= true,
+});
+
+-- there is a configuration option "allow_build_only_owner". If this is active, a player having track_builder can only build rails and operate signals/turnouts in an area explicitly belonging to him
+-- (checked using a dummy player called "*dummy*" (which is not an allowed player name))
+
+
+-- Protection ranges
+local npr_r = tonumber(minetest.settings:get("advtrains_prot_range_side")) or 1
+local npr_vr = tonumber(minetest.settings:get("advtrains_prot_range_up")) or 3
+local npr_vrd = tonumber(minetest.settings:get("advtrains_prot_range_down")) or 1
+
+local boo = minetest.settings:get_bool("advtrains_allow_build_to_owner")
+
+--[[
+Protection/privilege concept:
+Tracks:
+	Protected 1 node all around a rail and 4 nodes upward (maybe make this dynamically determined by the rail...)
+	if track_builder privilege:
+		if not protected from* player:
+			if allow_build_only_owner:
+				if unprotected:
+					deny
+			else:
+				allow
+	deny
+Wagons in general:
+	Players can only place/destroy wagons if they have train_operator
+Wagon driving controls:
+	The former seat_access tables are unnecessary, instead there is a whitelist for the driving stands
+	on player trying to access a driver stand:
+	if is owner or is on whitelist:
+		allow
+	else:
+		deny
+Wagon coupling:
+	Derived from the privileges for driving stands. The whitelist is shared (and also settable on non-driverstand wagons)
+	for each of the two bordering wagons:
+		if is owner or is on whitelist:
+			allow
+
+*"protected from" means the player is not allowed to do things, while "protected by" means that the player is (one of) the owner(s) of this area
+
+]]--
+
+-- temporarily prevent scanning for neighboring rail nodes recursively
+local nocheck
+
+local old_is_protected = minetest.is_protected
+
+-- Check if the node we are about to check is in the range of a track that is protected from a player
+minetest.is_protected = function(pos, pname)
+	
+	-- old_is_protected:
+	-- If an earlier callback decided that pos is protected, we wouldn't have been called
+	-- if a later callback decides it, get that here.
+	-- this effectively puts this function into a final-choice position
+	local oprot = old_is_protected(pos, pname)
+	if oprot then
+		return true
+	end
+	
+	if nocheck or pname=="" then
+		return false
+	end
+	
+	-- Special exception: to allow seamless rail connections between 2 separately protected
+	-- networks, rails itself are not affected by the radius setting. So, if the node here is
+	-- a rail, we skip the check and just use check_track_protection on same pos.
+	local node = minetest.get_node(pos)
+	if minetest.get_item_group(node.name, "advtrains_track") > 0 then
+		-- by here, we know that no other protection callback has this protected, we can safely pass "false".
+		-- hope this doesn't lead to bugs!
+		return not advtrains.check_track_protection(pos, pname, nil, false)
+	end
+	
+	local nodes = minetest.find_nodes_in_area(
+		{x = pos.x - npr_r, y = pos.y - npr_vr, z = pos.z - npr_r},
+		{x = pos.x + npr_r, y = pos.y + npr_vrd, z = pos.z + npr_r},
+		{"group:advtrains_track"})
+	for _,npos in ipairs(nodes) do
+		if not advtrains.check_track_protection(npos, pname, pos) then
+			return true
+		end
+	end
+	nocheck=false
+	return false
+end
+
+-- Check whether the player is permitted to modify this track
+-- Shall be called only for nodes that are or are about to become tracks.
+-- The range check from is_track_near_protected is disabled here.
+-- this splits in 1. track_builder privilege and 2. is_protected
+-- also respects the allow_build_to_owner property.
+--WARN: true means here that the action is allowed!
+function advtrains.check_track_protection(pos, pname, near, prot_p)
+	-- Parameter "near" is an optional position, the original node that the player
+	-- was about to affect, while "pos" represents the checked rail node
+	-- if "near" is not set, pos is the same node.
+	local nears = near and "near " or ""
+	local apos = near or pos
+	
+	-- note that having protection_bypass implicitly implies having track_builder, because else it would be possible to dig rails
+	-- (only checked by is_protected, which is not respected) but not place them.
+	-- We won't impose restrictions on protection_bypass owners.
+	if minetest.check_player_privs(pname, {protection_bypass = true}) then
+		return true
+	end
+	
+	nocheck = true
+	local priv = minetest.check_player_privs(pname, {track_builder = true})
+	
+	-- note: is_protected above already checks the is_protected value against the current player, so checking it again is useless.
+	local prot = prot_p
+	if prot==nil then
+		 prot = advtrains.is_protected(pos, pname)
+	end
+	local dprot = minetest.is_protected(pos, "*dummy*")
+	nocheck = false
+	
+	--atdebug("CTP: ",pos,pname,near,prot_p,"priv=",priv,"prot=",prot,"dprot=",dprot)
+	
+	if not priv and (not boo or prot or not dprot) then
+		minetest.chat_send_player(pname, "You are not allowed to build "..nears.."tracks without track_builder privilege")
+		minetest.log("action", pname.." tried to modify terrain "..nears.."track at "..minetest.pos_to_string(apos).." but is not permitted to (no privilege)")
+		return false
+	end
+	if prot then
+		minetest.chat_send_player(pname, "You are not allowed to build "..nears.."tracks at protected position!")
+		minetest.record_protection_violation(pos, pname)
+		minetest.log("action", pname.." tried to modify "..nears.."track at "..minetest.pos_to_string(apos).." but position is protected!")
+		return false
+	end
+	return true
+end
+
+--WARN: true means here that the action is allowed!
+function advtrains.check_driving_couple_protection(pname, owner, whitelist)
+	if minetest.check_player_privs(pname, {train_admin = true}) then
+		return true
+	end
+	if not minetest.check_player_privs(pname, {train_operator = true}) then
+		return false
+	end
+	if not owner or owner == pname then
+		return true
+	end
+	if whitelist and string.find(" "..whitelist.." ", " "..pname.." ", nil, true) then
+		return true
+	end
+	return false
+end
+function advtrains.check_turnout_signal_protection(pos, pname)
+	nocheck=true
+	if not minetest.check_player_privs(pname, {railway_operator = true}) then
+		if boo and not advtrains.is_protected(pos, pname) and minetest.is_protected(pos, "*dummy*") then
+			nocheck=false
+			return true
+		else
+			minetest.chat_send_player(pname, "You are not allowed to operate turnouts and signals (missing railway_operator privilege)")
+			minetest.log("action", pname.." tried to operate turnout/signal at "..minetest.pos_to_string(pos).." but does not have railway_operator")
+			nocheck=false
+			return false
+		end
+	end
+	if advtrains.is_protected(pos, pname) then
+		minetest.record_protection_violation(pos, pname)
+		nocheck=false
+		return false
+	end
+	nocheck=false
+	return true
+end
diff --git a/advtrains/advtrains/settingtypes.txt b/advtrains/advtrains/settingtypes.txt
new file mode 100644
index 0000000..d8eb44a
--- /dev/null
+++ b/advtrains/advtrains/settingtypes.txt
@@ -0,0 +1,47 @@
+#    Display train and wagon ID in the infotext of trains.
+#    Useful when working with LuaATC or while debugging.
+advtrains_show_ids (Show ID's in infotext) bool false
+
+#    Enable the debug ring buffer
+#    This has no effect on the user experience, except decreased performance. Debug outputs are saved in a ring buffer to be printed when an error occurs.
+#    You probably want to leave this setting set to false.
+advtrains_enable_debugging (Enable debugging) 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
+advtrains_enable_logging (Enable logging) bool false
+
+#    If this is active, any player can do the following things inside (and only inside) an area that is explicitly protected by him
+#    (checked using a dummy player called "*dummy*" (which is not an allowed player name)):
+#    - build tracks and near tracks without the track_builder privilege
+#    - operate turnouts and signals without the railway_operator privilege
+advtrains_allow_build_to_owner (Allow building/operating to privilegeless area owner) bool false
+
+#    Track protection range (horizontal)
+#    Players without the 'track_builder' privilege can not build within a box around any tracks determined by these range settings
+#    This setting is to be read as "r-0.5", so a value of 1 means a diameter of 3, a value of 2 a diameter of 5 a.s.o.
+#    The spanned area is a square. Fractional values are not supported.
+advtrains_prot_range_side (Track protection range [horizontal]) int 1 0 10
+
+#    Track protection range (up)
+#    Players without the 'track_builder' privilege can not build within a box around any tracks determined by these range settings
+#    This setting determines the upper y bound of the box, a value of 3 means that the rail and 3 nodes above it are protected
+advtrains_prot_range_up (Track protection range [up]) int 3 0 10
+
+#    Track protection range (down)
+#    Players without the 'track_builder' privilege can not build within a box around any tracks determined by these range settings
+#    This setting determines the lower y bound of the box, a value of 1 means that the rail and 1 node below it are protected
+advtrains_prot_range_down (Track protection range [down]) int 1 0 10
+
+#    Determine what effect "being overrun by a train" has.
+#    none: No damage is dealt at all.
+#    drop: Player is killed, all items are dropped as items on the tracks.
+#    normal: Player is killed, game-defined behavior is applied as if the player died by other means.
+advtrains_overrun_mode (Overrun mode) enum drop none,drop,normal
+
+#    Wagon entity loading/unloading range, in nodes
+#    When a wagon is within this range to a player, it is loaded
+#    When a wagon leaves this range + 32 nodes, it is unloaded
+#    If unset, defaults to active_block_range*16
+advtrains_wagon_load_range (Wagon Entity Load/Unload Range) int 96 32 512
diff --git a/advtrains/advtrains/signals.lua b/advtrains/advtrains/signals.lua
new file mode 100644
index 0000000..e144aa6
--- /dev/null
+++ b/advtrains/advtrains/signals.lua
@@ -0,0 +1,328 @@
+--advtrains by orwell96
+--signals.lua
+
+local mrules_wallsignal = advtrains.meseconrules
+
+local function can_dig_func(pos)
+	if advtrains.interlocking then
+		return advtrains.interlocking.signal_can_dig(pos)
+	end
+	return true
+end
+
+local function aspect(b)
+return {
+	main = {
+		free = b,
+		speed = -1,
+	},
+	shunt = {
+		free = false,
+		proceed_as_main = true
+	},
+	dst = {
+		free = true,
+		speed = -1,
+	},
+	info = {}
+}
+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", "")
+
+	for rotid, rotation in ipairs({"", "_30", "_45", "_60"}) do
+		local crea=1
+		if rotid==1 and r=="off" then crea=0 end
+		
+		minetest.register_node("advtrains:retrosignal_"..r..rotation, {
+			drawtype = "mesh",
+			paramtype="light",
+			paramtype2="facedir",
+			walkable = false,
+			selection_box = {
+				type = "fixed",
+				fixed = {-1/4, -1/2, -1/4, 1/4, 2, 1/4},
+			},
+			mesh = "advtrains_retrosignal_"..r..rotation..".b3d",
+			tiles = {"advtrains_retrosignal.png"},
+			inventory_image="advtrains_retrosignal_inv.png",
+			drop="advtrains:retrosignal_off",
+			description=attrans("Lampless Signal (@1)", attrans(r..rotation)),
+			sunlight_propagates=true,
+			groups = {
+				cracky=3,
+				not_blocking_trains=1,
+				not_in_creative_inventory=crea,
+				save_in_at_nodedb=1,
+				advtrains_signal = 2,
+			},
+			mesecons = {effector = {
+				rules=advtrains.meseconrules,
+				["action_"..f.as] = function (pos, node)
+					advtrains.ndb.swap_node(pos, {name = "advtrains:retrosignal_"..f.as..rotation, param2 = node.param2}, true)
+				end
+			}},
+			on_rightclick=function(pos, node, player)
+				local pname = player:get_player_name()
+				local sigd = advtrains.interlocking and advtrains.interlocking.db.get_sigd_for_signal(pos)
+				if sigd then
+					advtrains.interlocking.show_signalling_form(sigd, pname)
+				elseif advtrains.interlocking and player:get_player_control().aux1 then
+					advtrains.interlocking.show_ip_form(pos, pname)
+				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)
+				end
+			end,
+			-- new signal API
+			advtrains = {
+				set_aspect = function(pos, node, asp)
+					if asp.main.free 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
+			},
+			can_dig = can_dig_func,
+		})
+		advtrains.trackplacer.add_worked("advtrains:retrosignal", r, rotation, nil)
+		
+		minetest.register_node("advtrains:signal_"..r..rotation, {
+			drawtype = "mesh",
+			paramtype="light",
+			paramtype2="facedir",
+			walkable = false,
+			selection_box = {
+				type = "fixed",
+				fixed = {-1/4, -1/2, -1/4, 1/4, 2, 1/4},
+			},
+			mesh = "advtrains_signal"..rotation..".b3d",
+			tiles = {"advtrains_signal_"..r..".png"},
+			inventory_image="advtrains_signal_inv.png",
+			drop="advtrains:signal_off",
+			description=attrans("Signal (@1)", attrans(r..rotation)),
+			groups = {
+				cracky=3,
+				not_blocking_trains=1,
+				not_in_creative_inventory=crea,
+				save_in_at_nodedb=1,
+				advtrains_signal = 2,
+			},
+			light_source = 1,
+			sunlight_propagates=true,
+			mesecons = {effector = {
+				rules=advtrains.meseconrules,
+				["action_"..f.as] = function (pos, node)
+					advtrains.setstate(pos, f.als, node)
+				end
+			}},
+			on_rightclick=function(pos, node, player)
+				local pname = player:get_player_name()
+				local sigd = advtrains.interlocking and advtrains.interlocking.db.get_sigd_for_signal(pos)
+				if sigd then
+					advtrains.interlocking.show_signalling_form(sigd, pname)
+				elseif advtrains.interlocking and player:get_player_control().aux1 then
+					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)
+				end
+			end,
+			-- new signal API
+			advtrains = {
+				set_aspect = function(pos, node, asp)
+					if asp.main.free 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,
+				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)
+					end
+				end,
+			},
+			can_dig = can_dig_func,
+		})
+		advtrains.trackplacer.add_worked("advtrains:signal", r, rotation, nil)
+	end
+	
+	local crea=1
+	if r=="off" then crea=0 end
+	
+	--tunnel signals. no rotations.
+	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:signal_wall_"..loc.."_"..r, {
+			drawtype = "mesh",
+			paramtype="light",
+			paramtype2="facedir",
+			walkable = false,
+			selection_box = {
+				type = "fixed",
+				fixed = sbox,
+			},
+			mesh = "advtrains_signal_wall_"..loc..".b3d",
+			tiles = {"advtrains_signal_wall_"..r..".png"},
+			drop="advtrains:signal_wall_"..loc.."_off",
+			description=attrans("Wallmounted Signal ("..loc..")"),
+			groups = {
+				cracky=3,
+				not_blocking_trains=1,
+				not_in_creative_inventory=crea,
+				save_in_at_nodedb=1,
+				advtrains_signal = 2,
+			},
+			light_source = 1,
+			sunlight_propagates=true,
+			mesecons = {effector = {
+				rules = mrules_wallsignal,
+				["action_"..f.as] = function (pos, node)
+					advtrains.setstate(pos, f.als, node)
+				end
+			}},
+			on_rightclick=function(pos, node, player)
+				local pname = player:get_player_name()
+				local sigd = advtrains.interlocking and advtrains.interlocking.db.get_sigd_for_signal(pos)
+				if sigd then
+					advtrains.interlocking.show_signalling_form(sigd, pname)
+				elseif advtrains.interlocking and player:get_player_control().aux1 then
+					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)
+				end
+			end,
+			-- new signal API
+			advtrains = {
+				set_aspect = function(pos, node, asp)
+					if asp.main.free 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,
+				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)
+					end
+				end,
+			},
+			can_dig = can_dig_func,
+		})
+	end
+end
+
+-- level crossing
+-- german version (Andrew's Cross)
+minetest.register_node("advtrains:across_off", {
+	drawtype = "mesh",
+	paramtype="light",
+	paramtype2="facedir",
+	walkable = false,
+	selection_box = {
+		type = "fixed",
+		fixed = {-1/4, -1/2, -1/2, 1/4, 1.5, 0},
+	},
+	mesh = "advtrains_across.obj",
+	tiles = {"advtrains_across.png"},
+	drop="advtrains:across_off",
+	description=attrans("Andrew's Cross"),
+	groups = {
+		cracky=3,
+		not_blocking_trains=1,
+		save_in_at_nodedb=1,
+		not_in_creative_inventory=nil,
+	},
+	light_source = 1,
+	sunlight_propagates=true,
+	mesecons = {effector = {
+		rules = advtrains.meseconrules,
+		action_on = function (pos, node)
+			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
+				advtrains.ndb.swap_node(pos, {name = "advtrains:across_on", param2 = node.param2}, true)
+			end
+		end,
+	},
+	on_rightclick=function(pos, node, player)
+		if advtrains.check_turnout_signal_protection(pos, player:get_player_name()) then
+			advtrains.ndb.swap_node(pos, {name = "advtrains:across_on", param2 = node.param2}, true)
+		end
+	end,
+})
+minetest.register_node("advtrains:across_on", {
+	drawtype = "mesh",
+	paramtype="light",
+	paramtype2="facedir",
+	walkable = false,
+	selection_box = {
+		type = "fixed",
+		fixed = {-1/4, -1/2, -1/2, 1/4, 1.5, 0},
+	},
+	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)"),
+	groups = {
+		cracky=3,
+		not_blocking_trains=1,
+		save_in_at_nodedb=1,
+		not_in_creative_inventory=1,
+	},
+	light_source = 1,
+	sunlight_propagates=true,
+	mesecons = {effector = {
+		rules = advtrains.meseconrules,
+		action_off = function (pos, node)
+			advtrains.ndb.swap_node(pos, {name = "advtrains:across_off", param2 = node.param2}, true)
+		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",
+	},
+	on_rightclick=function(pos, node, player)
+		if advtrains.check_turnout_signal_protection(pos, player:get_player_name()) then
+			advtrains.ndb.swap_node(pos, {name = "advtrains:across_off", param2 = node.param2}, true)
+		end
+	end,
+})
+
+minetest.register_abm(
+	{
+        label = "Sound for Level Crossing",
+        nodenames = {"advtrains:across_on"},
+        interval = 3,
+        chance = 1,
+        action = function(pos, node, active_object_count, active_object_count_wider)
+			minetest.sound_play("advtrains_crossing_bell", {
+				pos = pos,
+				gain = 1.0, -- default
+				max_hear_distance = 16, -- default, uses an euclidean metric
+			})
+        end,
+    }
+)
diff --git a/advtrains/advtrains/sounds/advtrains_crossing_bell.ogg b/advtrains/advtrains/sounds/advtrains_crossing_bell.ogg
new file mode 100644
index 0000000..74df669
--- /dev/null
+++ b/advtrains/advtrains/sounds/advtrains_crossing_bell.ogg
diff --git a/advtrains/advtrains/textures/advtrains_across.png b/advtrains/advtrains/textures/advtrains_across.png
new file mode 100755
index 0000000..da65a61
--- /dev/null
+++ b/advtrains/advtrains/textures/advtrains_across.png
diff --git a/advtrains/advtrains/textures/advtrains_across_anim.png b/advtrains/advtrains/textures/advtrains_across_anim.png
new file mode 100755
index 0000000..584d023
--- /dev/null
+++ b/advtrains/advtrains/textures/advtrains_across_anim.png
diff --git a/advtrains/advtrains/textures/advtrains_boiler.png b/advtrains/advtrains/textures/advtrains_boiler.png
new file mode 100755
index 0000000..8c7ff0d
--- /dev/null
+++ b/advtrains/advtrains/textures/advtrains_boiler.png
diff --git a/advtrains/advtrains/textures/advtrains_chimney.png b/advtrains/advtrains/textures/advtrains_chimney.png
new file mode 100755
index 0000000..285a1a6
--- /dev/null
+++ b/advtrains/advtrains/textures/advtrains_chimney.png
diff --git a/advtrains/advtrains/textures/advtrains_copytool.png b/advtrains/advtrains/textures/advtrains_copytool.png
new file mode 100644
index 0000000..a8ea557
--- /dev/null
+++ b/advtrains/advtrains/textures/advtrains_copytool.png
diff --git a/advtrains/advtrains/textures/advtrains_couple.png b/advtrains/advtrains/textures/advtrains_couple.png
new file mode 100755
index 0000000..eda3704
--- /dev/null
+++ b/advtrains/advtrains/textures/advtrains_couple.png
diff --git a/advtrains/advtrains/textures/advtrains_cpl_lock.png b/advtrains/advtrains/textures/advtrains_cpl_lock.png
new file mode 100644
index 0000000..a25aaf4
--- /dev/null
+++ b/advtrains/advtrains/textures/advtrains_cpl_lock.png
diff --git a/advtrains/advtrains/textures/advtrains_cpl_unlock.png b/advtrains/advtrains/textures/advtrains_cpl_unlock.png
new file mode 100644
index 0000000..f58d00a
--- /dev/null
+++ b/advtrains/advtrains/textures/advtrains_cpl_unlock.png
diff --git a/advtrains/advtrains/textures/advtrains_discouple.png b/advtrains/advtrains/textures/advtrains_discouple.png
new file mode 100755
index 0000000..5c064c3
--- /dev/null
+++ b/advtrains/advtrains/textures/advtrains_discouple.png
diff --git a/advtrains/advtrains/textures/advtrains_driver_cab.png b/advtrains/advtrains/textures/advtrains_driver_cab.png
new file mode 100755
index 0000000..331bcc9
--- /dev/null
+++ b/advtrains/advtrains/textures/advtrains_driver_cab.png
diff --git a/advtrains/advtrains/textures/advtrains_dtrack_atc_placer.png b/advtrains/advtrains/textures/advtrains_dtrack_atc_placer.png
new file mode 100755
index 0000000..31c2b30
--- /dev/null
+++ b/advtrains/advtrains/textures/advtrains_dtrack_atc_placer.png
diff --git a/advtrains/advtrains/textures/advtrains_dtrack_bumper_placer.png b/advtrains/advtrains/textures/advtrains_dtrack_bumper_placer.png
new file mode 100755
index 0000000..27191fe
--- /dev/null
+++ b/advtrains/advtrains/textures/advtrains_dtrack_bumper_placer.png
diff --git a/advtrains/advtrains/textures/advtrains_dtrack_detector_placer.png b/advtrains/advtrains/textures/advtrains_dtrack_detector_placer.png
new file mode 100755
index 0000000..e6c6ad6
--- /dev/null
+++ b/advtrains/advtrains/textures/advtrains_dtrack_detector_placer.png
diff --git a/advtrains/advtrains/textures/advtrains_dtrack_load_placer.png b/advtrains/advtrains/textures/advtrains_dtrack_load_placer.png
new file mode 100755
index 0000000..427c011
--- /dev/null
+++ b/advtrains/advtrains/textures/advtrains_dtrack_load_placer.png
diff --git a/advtrains/advtrains/textures/advtrains_dtrack_placer.png b/advtrains/advtrains/textures/advtrains_dtrack_placer.png
new file mode 100755
index 0000000..7bef8a9
--- /dev/null
+++ b/advtrains/advtrains/textures/advtrains_dtrack_placer.png
diff --git a/advtrains/advtrains/textures/advtrains_dtrack_rail.png b/advtrains/advtrains/textures/advtrains_dtrack_rail.png
new file mode 100755
index 0000000..bd0c217
--- /dev/null
+++ b/advtrains/advtrains/textures/advtrains_dtrack_rail.png
diff --git a/advtrains/advtrains/textures/advtrains_dtrack_shared.png b/advtrains/advtrains/textures/advtrains_dtrack_shared.png
new file mode 100755
index 0000000..736c7db
--- /dev/null
+++ b/advtrains/advtrains/textures/advtrains_dtrack_shared.png
diff --git a/advtrains/advtrains/textures/advtrains_dtrack_shared_atc.png b/advtrains/advtrains/textures/advtrains_dtrack_shared_atc.png
new file mode 100755
index 0000000..1f83c37
--- /dev/null
+++ b/advtrains/advtrains/textures/advtrains_dtrack_shared_atc.png
diff --git a/advtrains/advtrains/textures/advtrains_dtrack_shared_detector_off.png b/advtrains/advtrains/textures/advtrains_dtrack_shared_detector_off.png
new file mode 100755
index 0000000..724d907
--- /dev/null
+++ b/advtrains/advtrains/textures/advtrains_dtrack_shared_detector_off.png
diff --git a/advtrains/advtrains/textures/advtrains_dtrack_shared_detector_on.png b/advtrains/advtrains/textures/advtrains_dtrack_shared_detector_on.png
new file mode 100755
index 0000000..7bb29d6
--- /dev/null
+++ b/advtrains/advtrains/textures/advtrains_dtrack_shared_detector_on.png
diff --git a/advtrains/advtrains/textures/advtrains_dtrack_shared_load.png b/advtrains/advtrains/textures/advtrains_dtrack_shared_load.png
new file mode 100755
index 0000000..5fd0d7a
--- /dev/null
+++ b/advtrains/advtrains/textures/advtrains_dtrack_shared_load.png
diff --git a/advtrains/advtrains/textures/advtrains_dtrack_shared_unload.png b/advtrains/advtrains/textures/advtrains_dtrack_shared_unload.png
new file mode 100755
index 0000000..e9fc5bd
--- /dev/null
+++ b/advtrains/advtrains/textures/advtrains_dtrack_shared_unload.png
diff --git a/advtrains/advtrains/textures/advtrains_dtrack_slopeplacer.png b/advtrains/advtrains/textures/advtrains_dtrack_slopeplacer.png
new file mode 100755
index 0000000..1d456b0
--- /dev/null
+++ b/advtrains/advtrains/textures/advtrains_dtrack_slopeplacer.png
diff --git a/advtrains/advtrains/textures/advtrains_dtrack_unload_placer.png b/advtrains/advtrains/textures/advtrains_dtrack_unload_placer.png
new file mode 100755
index 0000000..486861e
--- /dev/null
+++ b/advtrains/advtrains/textures/advtrains_dtrack_unload_placer.png
diff --git a/advtrains/advtrains/textures/advtrains_platform.png b/advtrains/advtrains/textures/advtrains_platform.png
new file mode 100755
index 0000000..5ba9663
--- /dev/null
+++ b/advtrains/advtrains/textures/advtrains_platform.png
diff --git a/advtrains/advtrains/textures/advtrains_platform_diag.png b/advtrains/advtrains/textures/advtrains_platform_diag.png
new file mode 100644
index 0000000..6e262e2
--- /dev/null
+++ b/advtrains/advtrains/textures/advtrains_platform_diag.png
diff --git a/advtrains/advtrains/textures/advtrains_retrosignal.png b/advtrains/advtrains/textures/advtrains_retrosignal.png
new file mode 100755
index 0000000..141198d
--- /dev/null
+++ b/advtrains/advtrains/textures/advtrains_retrosignal.png
diff --git a/advtrains/advtrains/textures/advtrains_retrosignal_inv.png b/advtrains/advtrains/textures/advtrains_retrosignal_inv.png
new file mode 100755
index 0000000..1036594
--- /dev/null
+++ b/advtrains/advtrains/textures/advtrains_retrosignal_inv.png
diff --git a/advtrains/advtrains/textures/advtrains_signal_inv.png b/advtrains/advtrains/textures/advtrains_signal_inv.png
new file mode 100755
index 0000000..ed64ed9
--- /dev/null
+++ b/advtrains/advtrains/textures/advtrains_signal_inv.png
diff --git a/advtrains/advtrains/textures/advtrains_signal_off.png b/advtrains/advtrains/textures/advtrains_signal_off.png
new file mode 100755
index 0000000..8046e52
--- /dev/null
+++ b/advtrains/advtrains/textures/advtrains_signal_off.png
diff --git a/advtrains/advtrains/textures/advtrains_signal_on.png b/advtrains/advtrains/textures/advtrains_signal_on.png
new file mode 100755
index 0000000..5228bb3
--- /dev/null
+++ b/advtrains/advtrains/textures/advtrains_signal_on.png
diff --git a/advtrains/advtrains/textures/advtrains_signal_wall_off.png b/advtrains/advtrains/textures/advtrains_signal_wall_off.png
new file mode 100755
index 0000000..3e7b1e1
--- /dev/null
+++ b/advtrains/advtrains/textures/advtrains_signal_wall_off.png
diff --git a/advtrains/advtrains/textures/advtrains_signal_wall_on.png b/advtrains/advtrains/textures/advtrains_signal_wall_on.png
new file mode 100755
index 0000000..b628c7e
--- /dev/null
+++ b/advtrains/advtrains/textures/advtrains_signal_wall_on.png
diff --git a/advtrains/advtrains/textures/advtrains_track_cr.png b/advtrains/advtrains/textures/advtrains_track_cr.png
new file mode 100755
index 0000000..40f0cc5
--- /dev/null
+++ b/advtrains/advtrains/textures/advtrains_track_cr.png
diff --git a/advtrains/advtrains/textures/advtrains_track_cr_45.png b/advtrains/advtrains/textures/advtrains_track_cr_45.png
new file mode 100755
index 0000000..54966b3
--- /dev/null
+++ b/advtrains/advtrains/textures/advtrains_track_cr_45.png
diff --git a/advtrains/advtrains/textures/advtrains_track_placer.png b/advtrains/advtrains/textures/advtrains_track_placer.png
new file mode 100755
index 0000000..03e17ed
--- /dev/null
+++ b/advtrains/advtrains/textures/advtrains_track_placer.png
diff --git a/advtrains/advtrains/textures/advtrains_track_st.png b/advtrains/advtrains/textures/advtrains_track_st.png
new file mode 100755
index 0000000..5ad7e4f
--- /dev/null
+++ b/advtrains/advtrains/textures/advtrains_track_st.png
diff --git a/advtrains/advtrains/textures/advtrains_track_st_45.png b/advtrains/advtrains/textures/advtrains_track_st_45.png
new file mode 100755
index 0000000..63b4c96
--- /dev/null
+++ b/advtrains/advtrains/textures/advtrains_track_st_45.png
diff --git a/advtrains/advtrains/textures/advtrains_track_swlcr.png b/advtrains/advtrains/textures/advtrains_track_swlcr.png
new file mode 100755
index 0000000..d9b5c0b
--- /dev/null
+++ b/advtrains/advtrains/textures/advtrains_track_swlcr.png
diff --git a/advtrains/advtrains/textures/advtrains_track_swlcr_45.png b/advtrains/advtrains/textures/advtrains_track_swlcr_45.png
new file mode 100755
index 0000000..f098fc9
--- /dev/null
+++ b/advtrains/advtrains/textures/advtrains_track_swlcr_45.png
diff --git a/advtrains/advtrains/textures/advtrains_track_swlst.png b/advtrains/advtrains/textures/advtrains_track_swlst.png
new file mode 100755
index 0000000..314bd2d
--- /dev/null
+++ b/advtrains/advtrains/textures/advtrains_track_swlst.png
diff --git a/advtrains/advtrains/textures/advtrains_track_swlst_45.png b/advtrains/advtrains/textures/advtrains_track_swlst_45.png
new file mode 100755
index 0000000..765d0ec
--- /dev/null
+++ b/advtrains/advtrains/textures/advtrains_track_swlst_45.png
diff --git a/advtrains/advtrains/textures/advtrains_track_swrcr.png b/advtrains/advtrains/textures/advtrains_track_swrcr.png
new file mode 100755
index 0000000..f74e1bc
--- /dev/null
+++ b/advtrains/advtrains/textures/advtrains_track_swrcr.png
diff --git a/advtrains/advtrains/textures/advtrains_track_swrcr_45.png b/advtrains/advtrains/textures/advtrains_track_swrcr_45.png
new file mode 100755
index 0000000..fa432aa
--- /dev/null
+++ b/advtrains/advtrains/textures/advtrains_track_swrcr_45.png
diff --git a/advtrains/advtrains/textures/advtrains_track_swrst.png b/advtrains/advtrains/textures/advtrains_track_swrst.png
new file mode 100755
index 0000000..06ea29e
--- /dev/null
+++ b/advtrains/advtrains/textures/advtrains_track_swrst.png
diff --git a/advtrains/advtrains/textures/advtrains_track_swrst_45.png b/advtrains/advtrains/textures/advtrains_track_swrst_45.png
new file mode 100755
index 0000000..be477b7
--- /dev/null
+++ b/advtrains/advtrains/textures/advtrains_track_swrst_45.png
diff --git a/advtrains/advtrains/textures/advtrains_trackworker.png b/advtrains/advtrains/textures/advtrains_trackworker.png
new file mode 100755
index 0000000..b50bcae
--- /dev/null
+++ b/advtrains/advtrains/textures/advtrains_trackworker.png
diff --git a/advtrains/advtrains/textures/advtrains_wagon_placeholder.png b/advtrains/advtrains/textures/advtrains_wagon_placeholder.png
new file mode 100644
index 0000000..383c181
--- /dev/null
+++ b/advtrains/advtrains/textures/advtrains_wagon_placeholder.png
diff --git a/advtrains/advtrains/textures/advtrains_wheel.png b/advtrains/advtrains/textures/advtrains_wheel.png
new file mode 100755
index 0000000..fb72879
--- /dev/null
+++ b/advtrains/advtrains/textures/advtrains_wheel.png
diff --git a/advtrains/advtrains/textures/drwho_screwdriver.png b/advtrains/advtrains/textures/drwho_screwdriver.png
new file mode 100755
index 0000000..b50bcae
--- /dev/null
+++ b/advtrains/advtrains/textures/drwho_screwdriver.png
diff --git a/advtrains/advtrains/trackdb_legacy.lua b/advtrains/advtrains/trackdb_legacy.lua
new file mode 100644
index 0000000..99349e8
--- /dev/null
+++ b/advtrains/advtrains/trackdb_legacy.lua
@@ -0,0 +1,27 @@
+--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/advtrains/trackplacer.lua b/advtrains/advtrains/trackplacer.lua
new file mode 100644
index 0000000..904d851
--- /dev/null
+++ b/advtrains/advtrains/trackplacer.lua
@@ -0,0 +1,438 @@
+--trackplacer.lua
+--holds code for the track-placing system. the default 'track' item will be a craftitem that places rails as needed. this will neither place or change switches nor place vertical rails.
+
+--all new trackplacer code
+local tp={
+	tracks={}
+}
+
+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
+
+
+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
+
+
+--[[
+	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
+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
+	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
+	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)
+		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)
+	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
+	else
+		if tr.single_conn[newdir] then--just rotate old rail to right orientation
+			return true
+		end
+		return false
+	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
+	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
+		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])
+			return true
+		end
+		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
+	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
+		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
+			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
+			end
+		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
+
+
+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 advtrains.pcall(function()
+					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
+						if def.suitable_substrate then
+							s = def.suitable_substrate(upos)
+						else
+							s = minetest.registered_nodes[minetest.get_node(upos).name] and minetest.registered_nodes[minetest.get_node(upos).name].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 advtrains.is_creative(name) then
+								itemstack:take_item()
+							end
+						end
+					end
+				end
+				return itemstack, true
+			end)
+		end,
+	})
+end
+
+
+
+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."),
+	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)
+		return advtrains.pcall(function()
+			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 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
+					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 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
+		end)
+	end,
+	on_use=function(itemstack, user, pointed_thing)
+		return advtrains.pcall(function()
+				local name = user: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 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
+					end
+				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
+		end)
+	end,
+})
+
+--putting into right place
+advtrains.trackplacer=tp
diff --git a/advtrains/advtrains/tracks.lua b/advtrains/advtrains/tracks.lua
new file mode 100644
index 0000000..6799c40
--- /dev/null
+++ b/advtrains/advtrains/tracks.lua
@@ -0,0 +1,742 @@
+--advtrains by orwell96, see readme.txt
+
+--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
+
+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 = "",
+		}
+	},
+	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}, {["3"]=0} },
+			desc = "3-way turnout (left)",
+			switchalt = "s",
+			switchst="l",
+			switchprefix = "",
+		},
+		s={
+			conns = { {c=0}, {c=8}, {c=7}, {c=9}, {["3"]=0} },
+			desc = "3-way turnout (straight)",
+			switchalt ="r",
+			switchst = "s",
+			switchprefix = "",
+		},
+		r={
+			conns = { {c=0}, {c=9}, {c=8}, {c=7}, {["3"]=0} },
+			desc = "3-way turnout (right)",
+			switchalt = "l",
+			switchst="r",
+			switchprefix = "",
+		}
+	},
+	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},
+	},
+	regsp=true,
+	slopeplacer={
+		[2]={"vst1", "vst2"},
+		[3]={"vst31", "vst32", "vst33"},
+		max=3,--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=7}, {c=15} },
+			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",
+	}
+}
+
+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
+
+--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
+]]
+
+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},
+					
+					groups = {
+						attached_node=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.can_dig_or_modify_track,
+					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, newstate, 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
+
+				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
+				end
+				advtrains.trackplacer.add_worked(def.nodename_prefix, suffix, rotation, var.trackworker)
+			end
+		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
+	
+	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
+	end
+	return false
+end
+
+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
+	local noderot=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
+	end
+	return advtrains.rotate_conn_by(nodedef.at_conns, noderot*AT_CMAX/4), (nodedef.at_rail_y or 0), tracktype
+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"
+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.")
+	end
+	-- interlocking: tcb, signal IP a.s.o.
+	if advtrains.interlocking then
+		-- TCB?
+		if advtrains.interlocking.db.get_tcb(pos) then
+			return false, attrans("There's a Track Circuit Break here.")
+		end
+		-- signal ip?
+		if advtrains.interlocking.db.is_ip_at(pos) then
+			return false, attrans("There's a Signal Influence Point here.")
+		end
+	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)
+	})
+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.
+		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
+
+--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/advtrains/trainhud.lua b/advtrains/advtrains/trainhud.lua
new file mode 100644
index 0000000..c90a406
--- /dev/null
+++ b/advtrains/advtrains/trainhud.lua
@@ -0,0 +1,226 @@
+--trainhud.lua: holds all the code for train controlling
+
+advtrains.hud = {}
+advtrains.hhud = {}
+
+minetest.register_on_leaveplayer(function(player)
+advtrains.hud[player:get_player_name()] = nil
+advtrains.hhud[player:get_player_name()] = nil
+end)
+
+local mletter={[1]="F", [-1]="R", [0]="N"}
+local doorstr={[-1]="|<>| >|<", [0]=">|< >|<", [1]=">|< |<>|"}
+
+function advtrains.on_control_change(pc, train, flip)
+   	local maxspeed = train.max_speed or 10
+	if pc.sneak then
+		if pc.up then
+			train.tarvelocity = maxspeed
+		end
+		if pc.down then
+			train.tarvelocity = 0
+		end
+		if pc.left then
+			train.tarvelocity = 4
+		end
+		if pc.right then
+			train.tarvelocity = 8
+		end
+		--[[if pc.jump then
+			train.brake = true
+			--0: released, 1: brake and pressed, 2: released and brake, 3: pressed and brake
+			if not train.brake_hold_state or train.brake_hold_state==0 then
+				train.brake_hold_state = 1
+			elseif train.brake_hold_state==2 then
+				train.brake_hold_state = 3
+			end
+		elseif train.brake_hold_state==1 then
+			train.brake_hold_state = 2
+		elseif train.brake_hold_state==3 then
+			train.brake = false
+			train.brake_hold_state = 0
+		end]]
+		--shift+use:see wagons.lua
+	else
+		local act=false
+		if pc.jump then
+			train.ctrl.user = 1
+			act=true
+		end
+		-- If atc command set, only "Jump" key can clear command. To prevent accidental control.
+		if train.tarvelocity or train.atc_command then
+			return
+		end
+		if pc.up then
+		   train.ctrl.user=4
+		   act=true
+		end
+		if pc.down then
+			if train.velocity>0 then
+				if pc.jump then
+					train.ctrl.user = 0
+				else
+					train.ctrl.user = 2
+				end
+				act=true
+			else
+				advtrains.invert_train(train.id)
+				advtrains.atc.train_reset_command(train)
+			end
+		end
+		if pc.left then
+			if train.door_open ~= 0 then
+				train.door_open = 0
+			else
+				train.door_open = -1
+			end
+		end
+		if pc.right then
+			if train.door_open ~= 0 then
+				train.door_open = 0
+			else
+				train.door_open = 1
+			end
+		end
+		if not act then
+			train.ctrl.user = nil
+		end
+	end
+end
+function advtrains.update_driver_hud(pname, train, flip)
+	local inside=train.text_inside or ""
+	advtrains.set_trainhud(pname, inside.."\n"..advtrains.hud_train_format(train, flip))
+end
+function advtrains.clear_driver_hud(pname)
+	advtrains.set_trainhud(pname, "")
+end
+
+function advtrains.set_trainhud(name, text)
+	local hud = advtrains.hud[name]
+	local player=minetest.get_player_by_name(name)
+	if not player then
+	   return
+	end
+	if not hud then
+		hud = {}
+		advtrains.hud[name] = hud
+		hud.id = player:hud_add({
+			hud_elem_type = "text",
+			name = "ADVTRAINS",
+			number = 0xFFFFFF,
+			position = {x=0.5, y=0.7},
+			offset = {x=0, y=0},
+			text = text,
+			scale = {x=200, y=60},
+			alignment = {x=0, y=0},
+		})
+		hud.oldText=text
+		return
+	elseif hud.oldText ~= text then
+		player:hud_change(hud.id, "text", text)
+		hud.oldText=text
+	end
+end
+function advtrains.set_help_hud(name, text)
+	local hud = advtrains.hhud[name]
+	local player=minetest.get_player_by_name(name)
+	if not player then
+	   return
+	end
+	if not hud then
+		hud = {}
+		advtrains.hhud[name] = hud
+		hud.id = player:hud_add({
+			hud_elem_type = "text",
+			name = "ADVTRAINS_HELP",
+			number = 0xFFFFFF,
+			position = {x=1, y=0.3},
+			offset = {x=0, y=0},
+			text = text,
+			scale = {x=200, y=60},
+			alignment = {x=1, y=0},
+		})
+		hud.oldText=text
+		return
+	elseif hud.oldText ~= text then
+		player:hud_change(hud.id, "text", text)
+		hud.oldText=text
+	end
+end
+
+--train.lever:
+--Speed control lever in train, for new train control system.
+--[[
+Value	Disp	Control	Meaning
+0		BB		S+Space	Emergency Brake
+1		B		Space	Normal Brake
+2		-		S		Roll
+3		o		<none>	Stay at speed
+4		+		W		Accelerate
+]]
+
+function advtrains.hud_train_format(train, flip)
+	local fct=flip and -1 or 1
+	if not train then return "" end
+	
+	local max = train.max_speed or 10
+	local res = train.speed_restriction or max
+	local vel = advtrains.abs_ceil(train.velocity)
+	local vel_kmh=advtrains.abs_ceil(advtrains.ms_to_kmh(train.velocity))
+	
+	local levers = "B - o +"
+	local tlev=train.lever
+	if train.velocity==0 and not train.active_control then tlev=1 end
+	if tlev == 0 then levers = ">BB< - o +" end
+	if tlev == 1 then levers = ">B< - o +" end
+	if tlev == 2 then levers = "B >-< o +" end
+	if tlev == 3 then levers = "B - >o< +" end
+	if tlev == 4 then levers = "B - o >+<" end
+	
+	local topLine, firstLine
+	
+	local secondLine
+	if train.tarvelocity or train.atc_command then
+		local b="   "
+		local tvels=""
+		if train.tarvelocity then
+			local tvel = advtrains.abs_ceil(train.tarvelocity)
+			tvels = "|"..string.rep("+", tvel)..string.rep("_", max-tvel)
+		end
+		if train.atc_brake_target then
+			b="-B-"
+		end
+		local ad = ""
+		if train.atc_delay then
+			ad = " "..advtrains.abs_ceil(train.atc_delay).."s "
+		end
+		secondLine="ATC"..b..": "..tvels..ad..(train.atc_command or "")
+	else
+		secondLine = "Manual operation"
+		if train.ctrl.lzb then
+			secondLine = "-!- Safety override -!-"
+		end
+	end
+	local shtind = train.is_shunt and "S" or ">"
+	
+	topLine="  ["..mletter[fct].."]  {"..levers.."} "..doorstr[(train.door_open or 0)].."  "..(train.line and "L: "..train.line or "")
+	firstLine=attrans("Speed:").." |"..string.rep("+", vel)..string.rep("_", res-vel).."|"..string.rep("_", max-res)..shtind.." "..vel_kmh.." km/h"
+	if train.speed_restriction == 0 then
+		firstLine = "OVERRUN RED SIGNAL! Examine situation and reverse train to move again."
+	end
+
+	local lzb = train.lzb
+	
+	local i = 1
+	while i<=#lzb.oncoming do
+		local k = lzb.oncoming[i]
+		secondLine = secondLine .. "\n".."LZB: speed limit ["..(k.spd or "E")..("] in %.1f m"):format(k.idx-train.index)
+		if k.spd == 0 then
+			break
+		end
+		i=i+1
+	end
+
+	
+	return (train.debug or "").."\n"..topLine.."\n"..firstLine.."\n"..secondLine
+end
diff --git a/advtrains/advtrains/trainlogic.lua b/advtrains/advtrains/trainlogic.lua
new file mode 100644
index 0000000..cc34b4f
--- /dev/null
+++ b/advtrains/advtrains/trainlogic.lua
@@ -0,0 +1,1255 @@
+--trainlogic.lua
+--controls train entities stuff about connecting/disconnecting/colliding trains and other things
+
+local setting_overrun_mode = minetest.settings:get("advtrains_overrun_mode")
+
+local benchmark=false
+local bm={}
+local bmlt=0
+local bmsteps=0
+local bmstepint=200
+atprintbm=function(action, ta)
+	if not benchmark then return end
+	local t=(os.clock()-ta)*1000
+	if not bm[action] then
+		bm[action]=t
+	else
+		bm[action]=bm[action]+t
+	end
+	bmlt=bmlt+t
+end
+function endstep()
+	if not benchmark then return end
+	bmsteps=bmsteps-1
+	if bmsteps<=0 then
+		bmsteps=bmstepint
+		for key, value in pairs(bm) do
+			minetest.chat_send_all(key.." "..(value/bmstepint).." ms avg.")
+		end
+		minetest.chat_send_all("Total time consumed by all advtrains actions per step: "..(bmlt/bmstepint).." ms avg.")
+		bm={}
+		bmlt=0
+	end
+end
+
+--acceleration for lever modes (trainhud.lua), per wagon
+local t_accel_all={
+	[0] = -10,
+	[1] = -3,
+	[2] = -0.5,
+	[4] = 0.5,
+}
+--acceleration per engine
+local t_accel_eng={
+	[0] = 0,
+	[1] = 0,
+	[2] = 0,
+	[4] = 1.5,
+}
+
+tp_player_tmr = 0
+
+advtrains.mainloop_trainlogic=function(dtime)
+	--build a table of all players indexed by pts. used by damage and door system.
+	advtrains.playersbypts={}
+	for _, player in pairs(minetest.get_connected_players()) do
+		if not advtrains.player_to_train_mapping[player:get_player_name()] then
+			--players in train are not subject to damage
+			local ptspos=minetest.pos_to_string(vector.round(player:getpos()))
+			advtrains.playersbypts[ptspos]=player
+		end
+	end
+	
+	if tp_player_tmr<=0 then
+		-- teleport players to their train every 2 seconds
+		for _, player in pairs(minetest.get_connected_players()) do
+			advtrains.tp_player_to_train(player)
+		end
+		tp_player_tmr = 2
+	else
+		tp_player_tmr = tp_player_tmr - dtime
+	end
+	--regular train step
+	--[[ structure:
+	1. make trains calculate their occupation windows when needed (a)
+	2. when occupation tells us so, restore the occupation tables (a)
+	4. make trains move and update their new occupation windows and write changes
+	   to occupation tables (b)
+	5. make trains do other stuff (c)
+	]]--
+	local t=os.clock()
+	
+	for k,v in pairs(advtrains.trains) do
+		advtrains.atprint_context_tid=k
+		advtrains.train_ensure_init(k, v)
+	end
+	
+	advtrains.lock_path_inval = true
+	
+	for k,v in pairs(advtrains.trains) do
+		advtrains.atprint_context_tid=k
+		advtrains.train_step_b(k, v, dtime)
+	end
+	
+	for k,v in pairs(advtrains.trains) do
+		advtrains.atprint_context_tid=k
+		advtrains.train_step_c(k, v, dtime)
+	end
+	
+	advtrains.lock_path_inval = false
+	
+	advtrains.atprint_context_tid=nil
+	
+	atprintbm("trainsteps", t)
+	endstep()
+end
+
+function advtrains.tp_player_to_train(player)
+	local pname = player:get_player_name()
+	local id=advtrains.player_to_train_mapping[pname]
+	if id then
+		local train=advtrains.trains[id]
+		if not train then advtrains.player_to_train_mapping[pname]=nil return end
+		--set the player to the train position.
+		--minetest will emerge the area and load the objects, which then will call reattach_all().
+		--because player is in mapping, it will not be subject to dying.
+		player:setpos(train.last_pos)
+	end
+end
+minetest.register_on_joinplayer(function(player)
+	return advtrains.pcall(function()
+		advtrains.hud[player:get_player_name()] = nil
+		advtrains.hhud[player:get_player_name()] = nil
+		--independent of this, cause all wagons of the train which are loaded to reattach their players
+		--needed because already loaded wagons won't call reattach_all()
+		for _,wagon in pairs(minetest.luaentities) do
+			if wagon.is_wagon and wagon.initialized and wagon.train_id==id then
+				wagon:reattach_all()
+			end
+		end
+	end)
+end)
+
+
+minetest.register_on_dieplayer(function(player)
+	return advtrains.pcall(function()
+		local pname=player:get_player_name()
+		local id=advtrains.player_to_train_mapping[pname]
+		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
+			end
+		end
+	end)
+end)
+
+--[[
+
+Zone diagram of a train (copy from occupation.lua!):
+              |___| |___| --> Direction of travel
+              oo oo+oo oo
+=|=======|===|===========|===|=======|===================|========|===
+ |SafetyB|CpB|   Train   |CpF|SafetyF|        Brake      |Aware   |
+[1]     [2] [3]         [4] [5]     [6]                 [7]      [8]
+This mapping from indices in occwindows to zone ids is contained in WINDOW_ZONE_IDS
+
+
+The occupation system has been abandoned. The constants will still be used
+to determine the couple distance
+(because of the reverse lookup, the couple system simplifies a lot...)
+
+]]--
+-- unless otherwise stated, in meters.
+local SAFETY_ZONE = 10
+local COUPLE_ZONE = 2 --value in index positions!
+local BRAKE_SPACE = 10
+local AWARE_ZONE = 10
+local WINDOW_ZONE_IDS = {
+	2, -- 1 - SafetyB
+	4, -- 2 - CpB
+	1, -- 3 - Train
+	5, -- 4 - CpF
+	3, -- 5 - SafetyF
+	6, -- 6 - Brake
+	7, -- 7 - Aware
+}
+
+
+-- If a variable does not exist in the table, it is assigned the default value
+local function assertdef(tbl, var, def)
+	if not tbl[var] then
+		tbl[var] = def
+	end
+end
+
+function advtrains.get_acceleration(train, lever)
+	local acc_all = t_accel_all[lever]
+	local acc_eng = t_accel_eng[lever]
+	local nwagons = #train.trainparts
+	if nwagons == 0 then
+		-- empty train! avoid division through zero
+		return -1
+	end
+	local acc = acc_all + (acc_eng*train.locomotives_in_train)/nwagons
+	return acc
+end
+
+-- Small local util function to recalculate train's end index
+local function recalc_end_index(train)
+	train.end_index = advtrains.path_get_index_by_offset(train, train.index, -train.trainlen)
+end
+
+-- Occupation Callback system
+-- see occupation.lua
+-- signature is advtrains.te_register_on_<?>(function(id, train) ... end)
+
+local function mkcallback(name)
+	local callt = {}
+	advtrains["te_register_on_"..name] = function(func)
+		assertt(func, "function")
+		table.insert(callt, func)
+	end
+	return callt, function(id, train)
+		for _,f in ipairs(callt) do
+			f(id, train)
+		end
+	end
+end
+
+local callbacks_new_path, run_callbacks_new_path = mkcallback("new_path")
+local callbacks_update, run_callbacks_update = mkcallback("update")
+local callbacks_create, run_callbacks_create = mkcallback("create")
+local callbacks_remove, run_callbacks_remove = mkcallback("remove")
+
+
+-- train_ensure_init: responsible for creating a state that we can work on, after one of the following events has happened:
+-- - the train's path got cleared
+-- - save files were loaded
+-- Additionally, this gets called outside the step cycle to initialize and/or remove a train, then occ_write_mode is set.
+function advtrains.train_ensure_init(id, train)
+	if not train then
+		atwarn("train_ensure_init: Called with id =",id,"but a nil train!")
+		atwarn(debug.traceback())
+		return nil
+	end
+	
+	train.dirty = true
+	if train.no_step then return nil end
+
+	assertdef(train, "velocity", 0)
+	--assertdef(train, "tarvelocity", 0)
+	assertdef(train, "acceleration", 0)
+	assertdef(train, "id", id)
+	assertdef(train, "ctrl", {})
+	
+	
+	if not train.drives_on or not train.max_speed then
+		advtrains.update_trainpart_properties(id)
+	end
+	
+	--restore path
+	if not train.path then
+		if not train.last_pos then
+			atlog("Train",id,": Restoring path failed, no last_pos set! Train will be disabled. You can try to fix the issue in the save file.")
+			train.no_step = true
+			return nil
+		end
+		if not train.last_connid then
+			atwarn("Train",id,": Restoring path: no last_connid set! Will assume 1")
+			train.last_connid = 1
+			--[[
+			Why this fix was necessary:
+			Issue: Migration problems on Grand Theft Auto Minetest
+			1. Run of this code, warning printed.
+			2. path_create failed with result==nil (there was an unloaded node, wait_for_path set)
+			3. in consequence, the supposed call to path_setrestore does not happen
+			4. train.last_connid is still unset
+			5. next step, warning is printed again
+			Result: log flood.
+			]]
+		end
+		
+		local result = advtrains.path_create(train, train.last_pos, train.last_connid or 1, train.last_frac or 0)
+		
+		if result==false then
+			atlog("Train",id,": Restoring path failed, node at",train.last_pos,"is gone! Train will be disabled. You can try to place a rail at this position and restart the server.")
+			train.no_step = true
+			return nil
+		elseif result==nil then
+			if not train.wait_for_path then
+				atlog("Train",id,": Can't initialize: Waiting for the (yet unloaded) node at",train.last_pos," to be loaded.")
+			end
+			train.wait_for_path = true
+			return false
+		end
+		-- by now, we should have a working initial path
+		train.wait_for_path = false
+		
+		advtrains.update_trainpart_properties(id)
+		recalc_end_index(train)
+		
+		--atdebug("Train",id,": Successfully restored path at",train.last_pos," connid",train.last_connid," frac",train.last_frac)
+		
+		-- run on_new_path callbacks
+		run_callbacks_new_path(id, train)
+	end
+	
+	train.dirty = false -- TODO einbauen!
+	return true
+end
+
+function advtrains.train_step_b(id, train, dtime)
+	if train.no_step or train.wait_for_path or not train.path then return end
+	
+	-- in this code, we check variables such as path_trk_? and path_dist. We need to ensure that the path is known for the whole 'Train' zone
+	advtrains.path_get(train, atfloor(train.index + 2))
+	advtrains.path_get(train, atfloor(train.end_index - 1))
+	
+	--- 3. handle velocity influences ---
+	local train_moves=(train.velocity~=0)
+	local tarvel_cap = train.speed_restriction
+	
+	if train.recently_collided_with_env then
+		tarvel_cap=0
+		if not train_moves then
+			train.recently_collided_with_env=nil--reset status when stopped
+		end
+	end
+	if train.locomotives_in_train==0 then
+		tarvel_cap=0
+	end
+	
+	--- 3a. this can be useful for debugs/warnings and is used for check_trainpartload ---
+	local t_info, train_pos=sid(id), advtrains.path_get(train, atfloor(train.index))
+	if train_pos then
+		t_info=t_info.." @"..minetest.pos_to_string(train_pos)
+		--atprint("train_pos:",train_pos)
+	end
+	
+	--apply off-track handling:
+	local front_off_track = train.index>train.path_trk_f
+	local back_off_track=train.end_index<train.path_trk_b
+	train.off_track = front_off_track or back_off_track
+	
+	if front_off_track then
+		tarvel_cap=0
+	end
+	if back_off_track then -- eventually overrides front_off_track restriction
+		tarvel_cap=1
+	end
+	
+	-- Driving control rework:
+	--[[
+	Items are only defined when something is controlling them.
+	In order of precedence.
+	train.ctrl = {
+		lzb  = restrictive override from LZB
+		user = User input from driverstand
+		atc  = ATC command override (determined here)
+	}
+	The code here determines the precedence and writes the final control into train.lever
+	]]
+	
+	--interpret ATC command and apply auto-lever control when not actively controlled
+	local trainvelocity = train.velocity
+	
+	if train.ctrl.user then
+		advtrains.atc.train_reset_command(train)
+	else
+		local braketar = train.atc_brake_target
+		local emerg = false -- atc_brake_target==-1 means emergency brake (BB command)
+		if braketar == -1 then
+			braketar = 0
+			emerg = true
+		end
+		if braketar and braketar>=trainvelocity then
+			train.atc_brake_target=nil
+			braketar = nil
+		end
+		--if train.tarvelocity and train.velocity==train.tarvelocity then
+		--	train.tarvelocity = nil
+		--end
+		if train.atc_wait_finish then
+			if not train.atc_brake_target and (not train.tarvelocity or train.velocity==train.tarvelocity) then
+				train.atc_wait_finish=nil
+			end
+		end
+		if train.atc_command then
+			if (not train.atc_delay or train.atc_delay<=0) and not train.atc_wait_finish then
+				advtrains.atc.execute_atc_command(id, train)
+			else
+				train.atc_delay=train.atc_delay-dtime
+			end
+		elseif train.atc_delay then
+			train.atc_delay = nil
+		end
+		
+		train.ctrl.atc = nil
+		if train.tarvelocity and train.tarvelocity>trainvelocity then
+			train.ctrl.atc=4
+		end
+		if train.tarvelocity and train.tarvelocity<trainvelocity then
+			if (braketar and braketar<trainvelocity) then
+				if emerg then
+					train.ctrl.atc = 0
+				else
+					train.ctrl.atc=1
+				end
+			else
+				train.ctrl.atc=2
+			end
+		end
+	end
+	
+	--if tarvel_cap and train.tarvelocity and tarvel_cap<train.tarvelocity then
+	--	train.tarvelocity=tarvel_cap
+	--end
+	
+	local tmp_lever
+	
+	for _, lev in pairs(train.ctrl) do
+		-- use the most restrictive of all control overrides
+		tmp_lever = math.min(tmp_lever or 4, lev)
+	end
+	
+	if not tmp_lever then
+		-- if there was no control at all, default to 3
+		tmp_lever = 3
+	end
+	
+	if tarvel_cap and trainvelocity>tarvel_cap then
+		tmp_lever = 0
+	end
+	
+	train.lever = tmp_lever
+	
+	--- 3a. actually calculate new velocity ---
+	if tmp_lever~=3 then
+		local accel = advtrains.get_acceleration(train, tmp_lever)
+		local vdiff = accel*dtime
+		
+		-- This should only be executed when we are accelerating
+		-- I suspect that this causes the braking bugs
+		if tmp_lever == 4 then
+		
+			-- ATC control exception: don't cross tarvelocity if
+			-- atc provided a target_vel
+			if train.tarvelocity then
+				local tvdiff = train.tarvelocity - trainvelocity
+				if tvdiff~=0 and math.abs(vdiff) > math.abs(tvdiff) then
+					--applying this change would cross tarvelocity
+					--atdebug("In Tvdiff condition, clipping",vdiff,"to",tvdiff)
+					--atdebug("vel=",trainvelocity,"tvel=",train.tarvelocity)
+					vdiff=tvdiff
+				end
+			end
+			if tarvel_cap and trainvelocity<=tarvel_cap and trainvelocity+vdiff>tarvel_cap then
+				vdiff = tarvel_cap - train.velocity
+			end
+			local mspeed = (train.max_speed or 10)
+			if trainvelocity+vdiff > mspeed then
+				vdiff = mspeed - trainvelocity
+			end
+		end
+		
+		if trainvelocity+vdiff < 0 then
+			vdiff = - trainvelocity
+		end
+
+
+		train.acceleration=vdiff
+		train.velocity=train.velocity+vdiff
+		--if train.ctrl.user then
+		--	train.tarvelocity = train.velocity
+		--end
+	else
+		train.acceleration = 0
+	end
+	
+	--- 4. move train ---
+	
+	local idx_floor = math.floor(train.index)
+	local pdist = (train.path_dist[idx_floor+1] - train.path_dist[idx_floor])
+	local distance = (train.velocity*dtime) / pdist
+	
+	--debugging code
+	--train.debug = atdump(train.ctrl).."step_dist: "..math.floor(distance*1000)
+	
+	train.index=train.index+distance
+	
+	recalc_end_index(train)
+
+end
+
+function advtrains.train_step_c(id, train, dtime)
+	if train.no_step or train.wait_for_path or not train.path then return end
+	
+	-- all location/extent-critical actions have been done.
+	-- calculate the new occupation window
+	run_callbacks_update(id, train)
+	
+	-- Return if something(TM) damaged the path
+	if train.no_step or train.wait_for_path or not train.path then return end
+	
+	advtrains.path_clear_unused(train)
+	
+	advtrains.path_setrestore(train)
+	
+	-- less important stuff
+	
+	train.check_trainpartload=(train.check_trainpartload or 0)-dtime
+	if train.check_trainpartload<=0 then
+		advtrains.spawn_wagons(id)
+		train.check_trainpartload=2
+	end
+	
+	--- 8. check for collisions with other trains and damage players ---
+	
+	local train_moves=(train.velocity~=0)
+	
+	--- Check whether this train can be coupled to another, and set couple entities accordingly
+	if not train.was_standing and not train_moves then
+		advtrains.train_check_couples(train)
+	end
+	train.was_standing = not train_moves
+	
+	if train_moves then
+		
+		local collided = false
+		local coll_grace=1
+		local collindex = advtrains.path_get_index_by_offset(train, train.index, -coll_grace)
+		local collpos = advtrains.path_get(train, atround(collindex))
+		if collpos then
+			local rcollpos=advtrains.round_vector_floor_y(collpos)
+			local is_loaded_area = minetest.get_node_or_nil(rcollpos) ~= nil
+			for x=-train.extent_h,train.extent_h do
+				for z=-train.extent_h,train.extent_h do
+					local testpos=vector.add(rcollpos, {x=x, y=0, z=z})
+					--- 8a Check collision ---
+					if not collided then
+
+						local col_tr = advtrains.occ.check_collision(testpos, id)
+						if col_tr then
+							advtrains.train_check_couples(train)
+							train.velocity = 0
+							advtrains.atc.train_reset_command(train)
+							collided = true
+						end
+
+						--- 8b damage players ---
+						if is_loaded_area and train.velocity > 3 and (setting_overrun_mode=="drop" or setting_overrun_mode=="normal") then
+							local testpts = minetest.pos_to_string(testpos)
+							local player=advtrains.playersbypts[testpts]
+							if player and player:get_hp()>0 and advtrains.is_damage_enabled(player:get_player_name()) then
+								--atdebug("damage found",player:get_player_name())
+								if setting_overrun_mode=="drop" then
+									--instantly kill player
+									--drop inventory contents first, to not to spawn bones
+									local player_inv=player:get_inventory()
+									for i=1,player_inv:get_size("main") do
+										minetest.add_item(testpos, player_inv:get_stack("main", i))
+									end
+									for i=1,player_inv:get_size("craft") do
+										minetest.add_item(testpos, player_inv:get_stack("craft", i))
+									end
+									-- empty lists main and craft
+									player_inv:set_list("main", {})
+									player_inv:set_list("craft", {})
+								end
+								player:set_hp(0)
+							end
+						end
+					end
+				end
+			end
+			--- 8c damage other objects ---
+			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:text" then
+						obj:punch(obj, 1, { full_punch_interval = 1.0, damage_groups = {fleshy = 1000}, }, nil)
+					end
+				end
+			end
+		end
+	end
+end
+
+-- Default occupation callbacks for node callbacks
+-- (remember, train.end_index is set separately because callbacks are
+--  asserted to rely on this)
+
+local function mknodecallback(name)
+	local callt = {}
+	advtrains["tnc_register_on_"..name] = function(func, prio)
+		assertt(func, "function")
+		if prio then
+			table.insert(callt, 1, func)
+		else
+			table.insert(callt, func)
+		end
+	end
+	return callt, function(pos, id, train, index, paramx1, paramx2, paramx3)
+		for _,f in ipairs(callt) do
+			f(pos, id, train, index, paramx1, paramx2, paramx3)
+		end
+	end
+end
+
+-- enter/leave-node callbacks
+-- signature is advtrains.tnc_register_on_enter/leave(function(pos, id, train, index) ... end)
+local callbacks_enter_node, run_callbacks_enter_node = mknodecallback("enter")
+local callbacks_leave_node, run_callbacks_leave_node = mknodecallback("leave")
+
+-- Node callback for approaching
+-- Might be called multiple times, whenever path is recalculated
+-- signature is function(pos, id, train, index, lzbdata)
+-- 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
+local callbacks_approach_node, run_callbacks_approach_node = mknodecallback("approach")
+
+
+local function tnc_call_enter_callback(pos, train_id, train, index)
+	--atdebug("tnc enter",pos,train_id)
+	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]
+	if mregnode and mregnode.advtrains and mregnode.advtrains.on_train_enter then
+		mregnode.advtrains.on_train_enter(pos, train_id, train, index)
+	end
+
+	-- call other registered callbacks
+	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)
+	end
+end
+local function tnc_call_leave_callback(pos, train_id, train, index)
+	--atdebug("tnc leave",pos,train_id)
+	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]
+	if mregnode and mregnode.advtrains and mregnode.advtrains.on_train_leave then
+		mregnode.advtrains.on_train_leave(pos, train_id, train, index)
+	end
+	
+	-- call other registered callbacks
+	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
+	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 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]
+	if mregnode and mregnode.advtrains and mregnode.advtrains.on_train_approach then
+		mregnode.advtrains.on_train_approach(pos, train_id, train, index, lzbdata)
+	end
+	
+	-- call other registered callbacks
+	run_callbacks_approach_node(pos, train_id, train, index, lzbdata)
+end
+
+
+advtrains.te_register_on_new_path(function(id, train)
+	train.tnc = {
+		old_index = atround(train.index),
+		old_end_index = atround(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 old_index = train.tnc.old_index
+	local old_end_index = train.tnc.old_end_index
+	while old_index < new_index do
+		old_index = old_index + 1
+		local pos = advtrains.round_vector_floor_y(advtrains.path_get(train,old_index))
+		tnc_call_enter_callback(pos, id, train, old_index)
+	end
+	while old_end_index < new_end_index do
+		local pos = advtrains.round_vector_floor_y(advtrains.path_get(train,old_end_index))
+		tnc_call_leave_callback(pos, id, train, old_end_index)
+		old_end_index = old_end_index + 1
+	end
+	train.tnc.old_index = new_index
+	train.tnc.old_end_index = new_end_index
+end)
+
+advtrains.te_register_on_create(function(id, train)
+	local index = atround(train.index)
+	local end_index = atround(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)
+		end_index = end_index + 1
+	end
+	--atdebug(id,"tnc create",train.index,train.end_index)
+end)
+
+advtrains.te_register_on_remove(function(id, train)
+	local index = atround(train.index)
+	local end_index = atround(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)
+		end_index = end_index + 1
+	end
+	--atdebug(id,"tnc remove",train.index,train.end_index)
+end)
+
+--returns new id
+function advtrains.create_new_train_at(pos, connid, ioff, trainparts)
+	local new_id=advtrains.random_id()
+	while advtrains.trains[new_id] do new_id=advtrains.random_id() end--ensure uniqueness
+	
+	local t={}
+	t.id = new_id
+	
+	t.last_pos=pos
+	t.last_connid=connid
+	t.last_frac=ioff
+	
+	--t.tarvelocity=0
+	t.velocity=0
+	t.trainparts=trainparts
+	
+	advtrains.trains[new_id] = t
+	--atdebug("Created new train:",t)
+	
+	if not advtrains.train_ensure_init(new_id, advtrains.trains[new_id]) then
+		atwarn("create_new_train_at",pos,connid,"failed! This might lead to temporary bugs.")
+		return
+	end
+	
+	run_callbacks_create(new_id, advtrains.trains[new_id])
+	
+	return new_id
+end
+
+function advtrains.remove_train(id)
+	local train = advtrains.trains[id]
+	
+	if not advtrains.train_ensure_init(id, train) then
+		atwarn("remove_train",id,"failed! This might lead to temporary bugs.")
+		return
+	end
+	
+	run_callbacks_remove(id, train)
+	
+	advtrains.path_invalidate(train)
+	advtrains.couple_invalidate(train)
+	
+	local tp = train.trainparts
+	--atdebug("Removing train",id,"leftover trainparts:",tp)
+	
+	advtrains.trains[id] = nil
+	
+	return tp
+	
+end
+
+
+function advtrains.add_wagon_to_train(wagon_id, train_id, index)
+	local train=advtrains.trains[train_id]
+	
+	if not advtrains.train_ensure_init(train_id, train) then
+		atwarn("Train",train_id,"is not initialized! Operation aborted!")
+		return
+	end
+	
+	if index then
+		table.insert(train.trainparts, index, wagon_id)
+	else
+		table.insert(train.trainparts, wagon_id)
+	end
+	
+	advtrains.update_trainpart_properties(train_id)
+	recalc_end_index(train)
+	run_callbacks_update(train_id, train)
+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)
+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;
+	
+	local rel_pos=0
+	local count_l=0
+	local shift_dcpl_lock=false
+	for i, w_id in ipairs(train.trainparts) do
+		
+		local data = advtrains.wagons[w_id]
+		
+		-- 1st: update wagon data (pos_in_train a.s.o)
+		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!")
+				wagon = advtrains.wagon_prototypes["advtrains:wagon_placeholder"]
+
+			end
+			rel_pos=rel_pos+wagon.wagon_span
+			data.train_id=train_id
+			data.pos_in_train=rel_pos
+			data.pos_in_trainparts=i
+			if wagon.is_locomotive then
+				count_l=count_l+1
+			end
+			if invert_flipstate then
+				data.wagon_flipped = not data.wagon_flipped
+				shift_dcpl_lock, data.dcpl_lock = data.dcpl_lock, shift_dcpl_lock
+			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
+	end
+	train.trainlen = rel_pos
+	train.locomotives_in_train = count_l
+end
+
+
+local ablkrng = advtrains.wagon_load_range
+-- This function checks whether entities need to be spawned for certain wagons, and spawns them.
+-- Called from train_step_*(), not required to check init.
+function advtrains.spawn_wagons(train_id)
+	local train = advtrains.trains[train_id]
+	
+	for i = 1, #train.trainparts do
+		local w_id = train.trainparts[i]
+		local data = advtrains.wagons[w_id]
+		if data then
+			if data.train_id ~= train_id then
+				atwarn("Train",train_id,"Wagon #",i,": Saved train ID",data.train_id,"did not match!")
+				data.train_id = train_id
+			end
+			if not advtrains.wagon_objects[w_id] or not advtrains.wagon_objects[w_id]:getyaw() then
+				-- eventually need to spawn new object. check if position is loaded.
+				local index = advtrains.path_get_index_by_offset(train, train.index, -data.pos_in_train)
+				local pos   = advtrains.path_get(train, atfloor(index))
+				
+				local spawn = false
+				for _,p in pairs(minetest.get_connected_players()) do
+					if vector.distance(p:get_pos(),pos)<=ablkrng then
+						spawn = true
+					end
+				end
+				
+				if spawn 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)
+				end
+			end
+		else
+			atwarn("Train",train_id,"Wagon #",1,": A wagon with id",w_id,"does not exist! Wagon will be removed from train.")
+			table.remove(train.trainparts, i)
+			i = i - 1
+		end
+	end
+end
+
+function advtrains.split_train_at_fc(train, count_empty, length_limit)
+	-- splits train at first different current FC by convention,
+	-- locomotives have empty FC so are ignored
+	-- count_empty is used to split off locomotives
+	-- length_limit limits the length of the first train to length_limit wagons
+	local train_id = train.id
+	local fc = false
+	local ind = 0
+	for i = 1, #train.trainparts do
+		local w_id = train.trainparts[i]
+		local data = advtrains.wagons[w_id]
+		if length_limit and i > length_limit then
+			ind = i
+			break
+		end
+		if data then
+			local wfc = advtrains.get_cur_fc(data)
+			if  wfc ~= "" or count_empty then
+				if  fc then
+					if fc ~= wfc then
+						ind = i
+						break
+					end
+				else
+					fc = wfc
+				end
+			end
+		end
+	end
+	if ind > 0 then
+		return advtrains.split_train_at_index(train, ind), fc
+	end
+	if fc then
+		return nil, fc
+	end
+end
+
+function advtrains.train_step_fc(train)
+	for i=1,#train.trainparts do
+		local w_id = train.trainparts[i]
+		local data = advtrains.wagons[w_id]
+		if data then
+			advtrains.step_fc(data)
+		end
+	end
+end
+
+function advtrains.split_train_at_index(train, index)
+	-- this function splits a train at index, creating a new train from the back part of the train.
+
+	local train_id=train.id
+	if index > #train.trainparts then
+		-- index specified too long
+		return
+	end
+	local w_id = train.trainparts[index]
+	local data = advtrains.wagons[w_id]
+	local _, wagon = advtrains.get_wagon_prototype(data)
+	if not advtrains.train_ensure_init(train_id, train) then
+		atwarn("Train",train_id,"is not initialized! Operation aborted!")
+		return
+	end
+
+	local p_index=advtrains.path_get_index_by_offset(train, train.index, - data.pos_in_train + wagon.wagon_span)
+	local pos, connid, frac = advtrains.path_getrestore(train, p_index)
+	local tp = {}
+	for k,v in ipairs(train.trainparts) do
+		if k >= index then
+			table.insert(tp, v)
+			train.trainparts[k] = nil
+		end
+	end
+	advtrains.update_trainpart_properties(train_id)
+	recalc_end_index(train)
+	run_callbacks_update(train_id, train)
+	
+	--create subtrain
+	local newtrain_id=advtrains.create_new_train_at(pos, connid, frac, tp)
+	local newtrain=advtrains.trains[newtrain_id]
+	
+	newtrain.velocity=train.velocity
+	return newtrain_id -- return new train ID, so new train can be manipulated
+
+end
+
+function advtrains.split_train_at_wagon(wagon_id)
+	--get train
+	local data = advtrains.wagons[wagon_id]
+	advtrains.split_train_at_index(advtrains.trains[data.train_id], data.pos_in_trainparts)
+end
+
+-- coupling
+local CPL_CHK_DST = -1
+local CPL_ZONE = 2
+
+-- train.couple_* contain references to ObjectRefs of couple objects, which contain all relevant information
+-- These objectRefs will delete themselves once the couples no longer match
+local function createcouple(pos, train1, t1_is_front, train2, t2_is_front)
+	local id1 = train1.id
+	local id2 = train2.id
+	if train1.autocouple or train2.autocouple then
+		-- couple trains
+		train1.autocouple = nil
+		train2.autocouple = nil		
+		minetest.after(0, advtrains.safe_couple_trains, id1, id2, t1_is_front, t2_is_front, false, false, train1.velocity, train2.velocity)
+		return
+	end
+	
+	local obj=minetest.add_entity(pos, "advtrains:couple")
+	if not obj then error("Failed creating couple object!") return end
+	local le=obj:get_luaentity()
+	le.train_id_1=id1
+	le.train_id_2=id2
+	le.t1_is_front=t1_is_front
+	le.t2_is_front=t2_is_front
+	--atdebug("created couple between",train1.id,t1_is_front,train2.id,t2_is_front)
+	if t1_is_front then
+		train1.cpl_front = obj
+	else
+		train1.cpl_back = obj
+	end
+	if t2_is_front then
+		train2.cpl_front = obj
+	else
+		train2.cpl_back = obj
+	end
+	
+end
+
+function advtrains.train_check_couples(train)
+	--atdebug("rechecking couples")
+	if train.cpl_front then
+		if not train.cpl_front:getyaw() then
+			-- objectref is no longer valid. reset.
+			train.cpl_front = nil
+		end
+	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)
+		if minetest.get_node_or_nil(pos) then -- if the position is loaded...
+			for tid, idx in pairs(front_trains) do
+				local other_train = advtrains.trains[tid]
+				if not advtrains.train_ensure_init(tid, other_train) then
+					atwarn("Train",tid,"is not initialized! Couldn't check couples!")
+					return
+				end
+				--atdebug(train.id,"front: ",idx,"on",tid,atround(other_train.index),atround(other_train.end_index))
+				if other_train.velocity == 0 then
+					if idx>=other_train.index and idx<=other_train.index + CPL_ZONE then
+						createcouple(pos, train, true, other_train, true)
+						break
+					end
+					if idx<=other_train.end_index and idx>=other_train.end_index - CPL_ZONE then
+						createcouple(pos, train, true, other_train, false)
+						break
+					end
+				end
+			end
+		end
+	end
+	if train.cpl_back then
+		if not train.cpl_back:getyaw() then
+			-- objectref is no longer valid. reset.
+			train.cpl_back = nil
+		end
+	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)
+		if minetest.get_node_or_nil(pos) then -- if the position is loaded...
+			for tid, idx in pairs(back_trains) do
+				local other_train = advtrains.trains[tid]
+				if not advtrains.train_ensure_init(tid, other_train) then
+					atwarn("Train",tid,"is not initialized! Couldn't check couples!")
+					return
+				end
+				if other_train.velocity == 0 then
+					if idx>=other_train.index and idx<=other_train.index + CPL_ZONE then
+						createcouple(pos, train, false, other_train, true)
+						break
+					end
+					if idx<=other_train.end_index and idx>=other_train.end_index - CPL_ZONE then
+						createcouple(pos, train, false, other_train, false)
+						break
+					end
+				end
+			end
+		end
+	end
+end
+
+function advtrains.couple_invalidate(train)
+	if train.cpl_back then
+		train.cpl_back:remove()
+		train.cpl_back = nil
+	end
+	if train.cpl_front then
+		train.cpl_front:remove()
+		train.cpl_front = nil
+	end
+	train.was_standing = nil
+end
+
+-- relevant code for this comment is in couple.lua
+
+--there are 4 cases:
+--1/2. F<->R F<->R regular, put second train behind first
+--->frontpos of first train will match backpos of second
+--3.   F<->R R<->F flip one of these trains, take the other as new train
+--->backpos's will match
+--4.   R<->F F<->R flip one of these trains and take it as new parent
+--->frontpos's will match
+
+
+function advtrains.do_connect_trains(first_id, second_id, vel)
+	local first, second=advtrains.trains[first_id], advtrains.trains[second_id]
+	
+	if not advtrains.train_ensure_init(first_id, first) then
+		atwarn("Train",first_id,"is not initialized! Operation aborted!")
+		return
+	end
+	if not advtrains.train_ensure_init(second_id, second) then
+		atwarn("Train",second_id,"is not initialized! Operation aborted!")
+		return
+	end
+	
+	local first_wagoncnt=#first.trainparts
+	local second_wagoncnt=#second.trainparts
+	
+	for _,v in ipairs(second.trainparts) do
+		table.insert(first.trainparts, v)
+	end
+	
+	advtrains.remove_train(second_id)
+	if vel < 0 then
+		advtrains.invert_train(first_id)
+		vel = -vel
+	end
+	first.velocity= vel or 0
+	
+	advtrains.update_trainpart_properties(first_id)
+	advtrains.couple_invalidate(first)
+	return true
+end
+
+function advtrains.invert_train(train_id)
+	local train=advtrains.trains[train_id]
+	
+	if not advtrains.train_ensure_init(train_id, train) then
+		atwarn("Train",train_id,"is not initialized! Operation aborted!")
+		return
+	end
+	
+	advtrains.path_setrestore(train, true)
+	
+	-- rotate some other stuff
+	if train.door_open then
+		train.door_open = - train.door_open
+	end
+	if train.atc_command then
+		train.atc_arrow = not train.atc_arrow
+	end
+	
+	advtrains.path_invalidate(train, true)
+	advtrains.couple_invalidate(train)
+	
+	local old_trainparts=train.trainparts
+	train.trainparts={}
+	for k,v in ipairs(old_trainparts) do
+		table.insert(train.trainparts, 1, v)--notice insertion at first place
+	end
+	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
+		train.is_shunt = true
+		train.speed_restriction = advtrains.SHUNT_SPEED_MAX
+	else
+		train.is_shunt = false
+		train.speed_restriction = nil
+	end
+end
+
+-- returns: train id, index of one of the trains that stand at this position.
+function advtrains.get_train_at_pos(pos)
+	local t = advtrains.occ.get_trains_at(pos)
+	for tid,idx in pairs(t) do
+		return tid, idx
+	end
+end
+
+
+-- ehm... I never adapted this function to the new path system ?!
+function advtrains.invalidate_all_paths(pos)
+	local tab
+	if pos then
+		-- if position given, check occupation system
+		tab = advtrains.occ.get_trains_over(pos)
+	else
+		tab = advtrains.trains
+	end
+	
+	for id, _ in pairs(tab) do
+		advtrains.invalidate_path(id)
+	end
+end
+function advtrains.invalidate_path(id)
+	--atdebug("Path invalidate:",id)
+	local v=advtrains.trains[id]
+	if not v then return end
+	advtrains.path_invalidate(v)
+	advtrains.couple_invalidate(v)
+	v.dirty = true
+end
+
+--not blocking trains group
+function advtrains.train_collides(node)
+	if node and minetest.registered_nodes[node.name] and minetest.registered_nodes[node.name].walkable then
+		if not minetest.registered_nodes[node.name].groups.not_blocking_trains then
+			return true
+		end
+	end
+	return false
+end
+
+local nonblocknodes={
+	"default:fence_wood",
+	"default:fence_acacia_wood",
+	"default:fence_aspen_wood",
+	"default:fence_pine_wood",
+	"default:fence_junglewood",
+	"default:torch",
+	"bones:bones",
+	
+	"default:sign_wall",
+	"signs:sign_wall",
+	"signs:sign_wall_blue",
+	"signs:sign_wall_brown",
+	"signs:sign_wall_orange",
+	"signs:sign_wall_green",
+	"signs:sign_yard",
+	"signs:sign_wall_white_black",
+	"signs:sign_wall_red",
+	"signs:sign_wall_white_red",
+	"signs:sign_wall_yellow",
+	"signs:sign_post",
+	"signs:sign_hanging",
+	
+	
+}
+minetest.after(0, function()
+	for _,name in ipairs(nonblocknodes) do
+		if minetest.registered_nodes[name] then
+			minetest.registered_nodes[name].groups.not_blocking_trains=1
+		end
+	end
+end)
diff --git a/advtrains/advtrains/wagons.lua b/advtrains/advtrains/wagons.lua
new file mode 100644
index 0000000..90615a5
--- /dev/null
+++ b/advtrains/advtrains/wagons.lua
@@ -0,0 +1,1437 @@
+-- wagon.lua
+-- Holds all logic related to wagons
+-- From now on, wagons are, just like trains, just entries in a table
+-- All data that is static is stored in the entity prototype (self).
+--   A copy of the entity prototype is always available inside wagon_prototypes
+-- All dynamic data is stored in the (new) wagons table
+-- An entity is ONLY spawned by update_trainpart_properties when it finds it useful.
+-- Only data that are only important to the entity itself are stored in the luaentity
+
+-- TP delay when getting off wagon
+local GETOFF_TP_DELAY = 0.5
+
+advtrains.wagons = {}
+advtrains.wagon_prototypes = {}
+advtrains.wagon_objects = {}
+
+local unload_wgn_range = advtrains.wagon_load_range + 32
+
+local setting_show_ids = minetest.settings:get_bool("advtrains_show_ids")
+
+--
+function advtrains.create_wagon(wtype, owner)
+	local new_id=advtrains.random_id()
+	while advtrains.wagons[new_id] do new_id=advtrains.random_id() end
+	local wgn = {}
+	wgn.type = wtype
+	wgn.seatp = {}
+	wgn.owner = owner
+	wgn.id = new_id
+	---wgn.train_id = train_id   --- will get this via update_trainpart_properties
+	advtrains.wagons[new_id] = wgn
+	--atdebug("Created new wagon:",wgn)
+	return new_id
+end
+
+local function make_inv_name(uid)
+	return "detached:advtrains_wgn_"..uid
+end
+
+
+local wagon={
+	collisionbox = {-0.5,-0.5,-0.5, 0.5,0.5,0.5},
+	--physical = true,
+	visual = "mesh",
+	mesh = "wagon.b3d",
+	visual_size = {x=1, y=1},
+	textures = {"black.png"},
+	is_wagon=true,
+	wagon_span=1,--how many index units of space does this wagon consume
+	wagon_width=3, -- Wagon width in meters
+	has_inventory=false,
+	static_save=false,
+}
+
+
+function wagon:train()
+	local data = advtrains.wagons[self.id]
+	return advtrains.trains[data.train_id]
+end
+
+
+function wagon:on_activate(sd_uid, dtime_s)
+	if sd_uid~="" then
+		--destroy when loaded from static block.
+		self.object:remove()
+		return
+	end
+	self.object:set_armor_groups({immortal=1})
+end
+
+local function invcallback(id, pname, rtallow, rtfail)
+	local data = advtrains.wagons[id]
+	if data and advtrains.check_driving_couple_protection(pname, data.owner, data.whitelist) then
+		return rtallow
+	end
+	return rtfail
+end
+
+function wagon:set_id(wid)
+	self.id = wid
+	self.initialized = true
+	
+	local data = advtrains.wagons[self.id]
+	advtrains.wagon_objects[self.id] = self.object
+	
+	--atdebug("Created wagon entity:",self.name," w_id",wid," t_id",data.train_id)
+	
+	if self.has_inventory then
+		--to be used later
+		local inv=minetest.get_inventory({type="detached", name="advtrains_wgn_"..self.id})
+		-- create inventory, if not yet created
+		if not inv then	
+			inv=minetest.create_detached_inventory("advtrains_wgn_"..self.id, {
+				allow_move = function(inv, from_list, from_index, to_list, to_index, count, player)
+					return invcallback(wid, player:get_player_name(), count, 0)
+				end,
+				allow_put = function(inv, listname, index, stack, player)
+					return invcallback(wid, player:get_player_name(), stack:get_count(), 0)
+				end,
+				allow_take = function(inv, listname, index, stack, player)
+					return invcallback(wid, player:get_player_name(), stack:get_count(), 0)
+				end
+			})
+			if data.ser_inv then
+				advtrains.deserialize_inventory(data.ser_inv, inv)
+			end
+			if self.inventory_list_sizes then
+				for lst, siz in pairs(self.inventory_list_sizes) do
+					inv:set_size(lst, siz)
+				end
+			end
+		end
+	end
+	self.door_anim_timer=0
+	self.door_state=0
+	
+	minetest.after(0.2, function() self:reattach_all() end)
+	
+	
+	
+	if self.set_textures then
+		self:set_textures(data)
+	end
+	
+	if self.custom_on_activate then
+		self:custom_on_activate()
+	end
+end
+
+function wagon:get_staticdata()
+	return "STATIC"
+end
+
+function wagon:ensure_init()
+			-- Note: A wagon entity won't exist when there's no train, because the train is
+			-- the thing that actually creates the entity
+			-- Train not being set just means that this will happen as soon as the train calls update_trainpart_properties.
+	if self.initialized and self.id then
+		local data = advtrains.wagons[self.id]
+		if data and data.train_id and self:train() then
+			if self.noninitticks then self.noninitticks=nil end
+			return true
+		end
+	end
+	if not self.noninitticks then
+		atwarn("wagon",self.id,"uninitialized init=",self.initialized)
+		self.noninitticks=0
+	end
+	self.noninitticks=self.noninitticks+1
+	if self.noninitticks>20 then
+		atwarn("wagon",self.id,"uninitialized, removing")
+		self:destroy()
+	else
+		self.object:setvelocity({x=0,y=0,z=0})
+	end
+	return false
+end
+
+function wagon:train()
+	local data = advtrains.wagons[self.id]
+	return advtrains.trains[data.train_id]
+end
+
+-- Remove the wagon
+function wagon:on_punch(puncher, time_from_last_punch, tool_capabilities, direction)
+	return advtrains.pcall(function()
+		if not self:ensure_init() then return end
+		
+		local data = advtrains.wagons[self.id]
+	
+		if not puncher or not puncher:is_player() then
+			return
+		end
+		if data.owner and puncher:get_player_name()~=data.owner and (not minetest.check_player_privs(puncher, {train_admin = true })) then
+		   minetest.chat_send_player(puncher:get_player_name(), attrans("This wagon is owned by @1, you can't destroy it.", data.owner));
+		   return
+		end
+		
+		if self.custom_may_destroy then
+			if not self.custom_may_destroy(self, puncher, time_from_last_punch, tool_capabilities, direction) then
+				return
+			end
+		end
+		local itemstack = puncher:get_wielded_item()
+		-- WARNING: This part of the API is guaranteed to change! DO NOT USE!
+		if self.set_livery and itemstack:get_name() == "bike:painter" then
+			self:set_livery(puncher, itemstack, data)
+			return
+		end
+		-- check whether wagon has an inventory. Is is empty?
+		if self.has_inventory then
+			local inv=minetest.get_inventory({type="detached", name="advtrains_wgn_"..self.id})
+			if not inv then -- inventory is not initialized when wagon was never loaded - should never happen
+				atwarn("Destroying wagon with inventory, but inventory is not found? Shouldn't happen!")
+				return
+			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!"));
+					return
+				end
+			end
+		end
+		
+		if #(self:train().trainparts)>1 then
+		   minetest.chat_send_player(puncher:get_player_name(), attrans("Wagon needs to be decoupled from other wagons in order to destroy it."));
+		   return
+		end
+
+		local pc=puncher:get_player_control()
+		if not pc.sneak then
+			minetest.chat_send_player(puncher:get_player_name(), attrans("Warning: If you destroy this wagon, you only get some steel back! If you are sure, hold Sneak and left-click the wagon."))
+			return
+		end
+		
+		
+		if not self:destroy() then return end
+
+		local inv = puncher:get_inventory()
+		for _,item in ipairs(self.drops or {self.name}) do
+			inv:add_item("main", item)
+		end
+	end)
+end
+function wagon:destroy()
+	--some rules:
+	-- you get only some items back
+	-- single left-click shows warning
+	-- shift leftclick destroys
+	-- not when a driver is inside
+	if self.id then
+		local data = advtrains.wagons[self.id]
+		if not data then
+			atwarn("wagon:destroy(): data is not set!")
+			return
+		end
+		
+		if self.custom_on_destroy then
+			self.custom_on_destroy(self)
+		end
+		
+		for seat,_ in pairs(data.seatp) do
+			self:get_off(seat)
+		end
+		
+		if data.train_id and self:train() then
+			advtrains.remove_train(data.train_id)
+			advtrains.wagons[self.id]=nil
+			if self.discouple then self.discouple.object:remove() end--will have no effect on unloaded objects
+		end
+	end
+	--atdebug("[wagon ", self.id, "]: destroying")
+	
+	self.object:remove()
+	return true
+end
+
+function wagon:on_step(dtime)
+	return advtrains.pcall(function()
+		if not self:ensure_init() then return end
+		
+		local t=os.clock()
+		local pos = self.object:getpos()
+		local data = advtrains.wagons[self.id]
+		
+		if not pos then
+			--atdebug("["..self.id.."][fatal] missing position (object:getpos() returned nil)")
+			return
+		end
+		
+		if not data.seatp then
+			data.seatp={}
+		end
+		if not self.seatpc then
+			self.seatpc={}
+		end
+		
+		local train=self:train()
+
+		--custom on_step function
+		if self.custom_on_step then
+			self:custom_on_step(dtime, data, train)
+		end
+
+		--driver control
+		for seatno, seat in ipairs(self.seats) do
+			local pname=data.seatp[seatno]
+			local driver=pname and minetest.get_player_by_name(pname)
+			local has_driverstand = pname and advtrains.check_driving_couple_protection(pname, data.owner, data.whitelist)
+			if self.seat_groups then
+				has_driverstand = has_driverstand and (seat.driving_ctrl_access or self.seat_groups[seat.group].driving_ctrl_access)
+			else
+				has_driverstand = has_driverstand and (seat.driving_ctrl_access)
+			end
+			if has_driverstand and driver then
+				advtrains.update_driver_hud(driver:get_player_name(), self:train(), data.wagon_flipped)
+			elseif driver then
+				--only show the inside text
+				local inside=self:train().text_inside or ""
+				advtrains.set_trainhud(driver:get_player_name(), inside)
+			end
+			if driver and driver:get_player_control_bits()~=self.seatpc[seatno] then
+				local pc=driver:get_player_control()
+				self.seatpc[seatno]=driver:get_player_control_bits()
+				
+				if has_driverstand then
+					--regular driver stand controls
+					advtrains.on_control_change(pc, self:train(), data.wagon_flipped)
+					--bordcom
+					if pc.sneak and pc.jump then
+						self:show_bordcom(data.seatp[seatno])
+					end
+					--sound horn when required
+					if self.horn_sound and pc.aux1 and not pc.sneak and not self.horn_handle then
+						self.horn_handle = minetest.sound_play(self.horn_sound, {
+							object = self.object,
+							gain = 1.0, -- default
+							max_hear_distance = 128, -- default, uses an euclidean metric
+							loop = true,
+						})
+					elseif not pc.aux1 and self.horn_handle then
+						minetest.sound_stop(self.horn_handle)
+						self.horn_handle = nil
+					end
+				else
+					-- If on a passenger seat and doors are open, get off when W or D pressed.
+					local pass = data.seatp[seatno] and minetest.get_player_by_name(data.seatp[seatno])
+					if pass and self:train().door_open~=0 then
+					local pc=pass:get_player_control()
+						if pc.up or pc.down then
+							self:get_off(seatno)
+						end
+					end		      
+				end
+				if pc.aux1 and pc.sneak then
+					self:get_off(seatno)
+				end
+			end
+		end
+		
+		--check infotext
+		local outside=train.text_outside or ""
+		if setting_show_ids then
+			outside = outside .. "\nT:" .. data.train_id .. " W:" .. self.id .. " O:" .. data.owner
+		end
+		
+		
+		--show off-track information in outside text instead of notifying the whole server about this
+		if train.off_track then
+			outside = outside .."\n!!! Train off track !!!"
+		end
+		
+		if self.infotext_cache~=outside  then
+			self.object:set_properties({infotext=outside})
+			self.infotext_cache=outside
+		end
+		
+		local fct=data.wagon_flipped and -1 or 1
+		
+		--door animation
+		if self.doors then
+			if (self.door_anim_timer or 0)<=0 then
+				local dstate = (train.door_open or 0) * fct
+				if dstate ~= self.door_state then
+					local at
+					--meaning of the train.door_open field:
+					-- -1: left doors (rel. to train orientation)
+					--  0: closed
+					--  1: right doors
+					--this code produces the following behavior:
+					-- if changed from 0 to +-1, play open anim. if changed from +-1 to 0, play close.
+					-- if changed from +-1 to -+1, first close and set 0, then it will detect state change again and run open.
+					if self.door_state == 0 then
+						if self.doors.open.sound then minetest.sound_play(self.doors.open.sound, {object = self.object}) end
+						at=self.doors.open[dstate]
+						self.object:set_animation(at.frames, at.speed or 15, at.blend or 0, false)
+						self.door_state = dstate
+					else
+						if self.doors.close.sound then minetest.sound_play(self.doors.close.sound, {object = self.object}) end
+						at=self.doors.close[self.door_state or 1]--in case it has not been set yet
+						self.object:set_animation(at.frames, at.speed or 15, at.blend or 0, false)
+						self.door_state = 0
+					end
+					self.door_anim_timer = at.time
+				end
+			else
+				self.door_anim_timer = (self.door_anim_timer or 0) - dtime
+			end
+		end
+		
+		--for path to be available. if not, skip step
+		if not train.path or train.no_step then
+			self.object:setvelocity({x=0, y=0, z=0})
+			self.object:setacceleration({x=0, y=0, z=0})
+			return
+		end
+		if not data.pos_in_train then
+			return
+		end
+		
+		-- Calculate new position, yaw and direction vector
+		local index = advtrains.path_get_index_by_offset(train, train.index, -data.pos_in_train)
+		local pos, yaw, npos, npos2 = advtrains.path_get_interpolated(train, index)
+		local vdir = vector.normalize(vector.subtract(npos2, npos))
+		
+		--automatic get_on
+		--needs to know index and path
+		if self.door_entry and train.door_open and train.door_open~=0 and train.velocity==0 then
+			--using the mapping created by the trainlogic globalstep
+			for i, ino in ipairs(self.door_entry) do
+				--fct is the flipstate flag from door animation above
+				local aci = advtrains.path_get_index_by_offset(train, index, ino*fct)
+				local ix1, ix2 = advtrains.path_get_adjacent(train, aci)
+				-- the two wanted positions are ix1 and ix2 + (2nd-1st rotated by 90deg)
+				-- (x z) rotated by 90deg is (-z x)  (http://stackoverflow.com/a/4780141)
+				local add = { x = (ix2.z-ix1.z)*train.door_open, y = 0, z = (ix1.x-ix2.x)*train.door_open }
+				local pts1=vector.round(vector.add(ix1, add))
+				local pts2=vector.round(vector.add(ix2, add))
+				if minetest.get_item_group(minetest.get_node(pts1).name, "platform")>0 then
+					local ckpts={
+						pts1,
+						pts2,
+						vector.add(pts1, {x=0, y=1, z=0}),
+						vector.add(pts2, {x=0, y=1, z=0}),
+					}
+					for _,ckpos in ipairs(ckpts) do
+						local cpp=minetest.pos_to_string(ckpos)
+						if advtrains.playersbypts[cpp] then
+							self:on_rightclick(advtrains.playersbypts[cpp])
+						end
+					end
+				end
+			end
+		end
+		
+		--checking for environment collisions(a 3x3 cube around the center)
+		if not train.recently_collided_with_env then
+			local collides=false
+			local exh = self.extent_h or 1
+			local exv = self.extent_v or 2
+			for x=-exh,exh do
+				for y=0,exv do
+					for z=-exh,exh do
+						local node=minetest.get_node_or_nil(vector.add(npos, {x=x, y=y, z=z}))
+						if (advtrains.train_collides(node)) then
+							collides=true
+						end
+					end
+				end
+			end
+			if collides then
+				-- screw collision mercy
+				train.recently_collided_with_env=true
+				train.velocity=0
+				advtrains.atc.train_reset_command(train)
+			end
+		end
+		
+		--DisCouple
+		-- FIX: Need to do this after the yaw calculation
+		if data.pos_in_trainparts and data.pos_in_trainparts>1 then
+			if train.velocity==0 then
+				if not self.discouple or not self.discouple.object:getyaw() then
+					atprint(self.id,"trying to spawn discouple")
+					local dcpl_pos = vector.add(pos, {y=0, x=-math.sin(yaw)*self.wagon_span, z=math.cos(yaw)*self.wagon_span})
+					local object=minetest.add_entity(dcpl_pos, "advtrains:discouple")
+					if object then
+						local le=object:get_luaentity()
+						le.wagon=self
+						--box is hidden when attached, so unuseful.
+						--object:set_attach(self.object, "", {x=0, y=0, z=self.wagon_span*10}, {x=0, y=0, z=0})
+						self.discouple=le
+					end
+				end
+			else
+				if self.discouple and self.discouple.object:getyaw() then
+					self.discouple.object:remove()
+					atprint(self.id," removing discouple")
+				end
+			end
+		end
+		
+		--FIX: use index of the wagon, not of the train.
+		local velocity = train.velocity
+		local acceleration = (train.acceleration or 0)
+		local velocityvec = vector.multiply(vdir, velocity)
+		local accelerationvec = vector.multiply(vdir, acceleration)
+		
+		if data.wagon_flipped then
+			yaw=yaw+math.pi
+		end
+		
+		-- this timer runs off every 2 seconds.
+		self.updatepct_timer=(self.updatepct_timer or 0)-dtime
+		local updatepct_timer_elapsed = self.updatepct_timer<=0
+		
+		if updatepct_timer_elapsed then
+			--restart timer
+			self.updatepct_timer=2
+			-- perform checks that are not frequently needed
+			
+			-- unload entity if out of range (because relevant pr won't be merged in engine)
+			-- This is a WORKAROUND!
+			local players_in = false
+			for sno,pname in pairs(data.seatp) do
+				if minetest.get_player_by_name(pname) then
+					-- Fix: If the RTT is too high, a wagon might be recognized out of range even if a player sits in it
+					-- (client updates position not fast enough)
+					players_in = true
+					break
+				end
+			end
+			if not players_in then
+				local outofrange = true
+				for _,p in pairs(minetest.get_connected_players()) do
+					if vector.distance(p:get_pos(),pos)<=unload_wgn_range then
+						outofrange = false
+					end
+				end
+				if outofrange then
+					--atdebug("wagon",self.id,"unloading (too far away)")
+					self.object:remove()
+				end
+			end
+		end
+		
+		if not self.old_velocity_vector 
+				or not vector.equals(velocityvec, self.old_velocity_vector)
+				or not self.old_acceleration_vector 
+				or not vector.equals(accelerationvec, self.old_acceleration_vector)
+				or self.old_yaw~=yaw
+				or updatepct_timer_elapsed then--only send update packet if something changed
+			
+			self.object:setpos(pos)
+			self.object:setvelocity(velocityvec)
+			self.object:setacceleration(accelerationvec)
+			
+			if #self.seats > 0 and self.old_yaw ~= yaw then
+				if not self.player_yaw then
+					self.player_yaw = {}
+				end
+				if not self.old_yaw then
+					self.old_yaw=yaw
+				end
+				for _,name in pairs(data.seatp) do
+					local p = minetest.get_player_by_name(name)
+					if p then
+						if not self.turning then
+							-- save player looking direction offset
+							self.player_yaw[name] = p:get_look_horizontal()-self.old_yaw
+						end
+						-- set player looking direction using calculated offset
+						p:set_look_horizontal((self.player_yaw[name] or 0)+yaw)
+					end
+				end
+				self.turning = true							 
+			elseif self.old_yaw == yaw then
+				-- train is no longer turning
+				self.turning = false
+			end
+			
+			if self.object.set_rotation then
+                local pitch = math.atan2(vdir.y, math.hypot(vdir.x, vdir.z))
+                if data.wagon_flipped then
+                    pitch = -pitch
+                end
+                self.object:set_rotation({x=pitch, y=yaw, z=0})
+            else
+                self.object:setyaw(yaw)
+            end
+			
+			if self.update_animation then
+				self:update_animation(train.velocity, self.old_velocity)
+			end
+			if self.custom_on_velocity_change then
+				self:custom_on_velocity_change(train.velocity, self.old_velocity or 0, dtime)
+			end
+			-- remove discouple object, because it will be in a wrong location
+			if not updatepct_timer_elapsed and self.discouple then
+				self.discouple.object:remove()
+			end
+		end
+		
+		
+		self.old_velocity_vector=velocityvec
+		self.old_velocity = train.velocity
+		self.old_acceleration_vector=accelerationvec
+		self.old_yaw=yaw
+		atprintbm("wagon step", t)
+	end)
+end
+
+function wagon:on_rightclick(clicker)
+	return advtrains.pcall(function()
+		if not self:ensure_init() then return end
+		if not clicker or not clicker:is_player() then
+			return
+		end
+		
+		local data = advtrains.wagons[self.id]
+		
+		local pname=clicker:get_player_name()
+		local no=self:get_seatno(pname)
+		if no then
+			if self.seat_groups then
+				local poss={}
+				local sgr=self.seats[no].group
+				for _,access in ipairs(self.seat_groups[sgr].access_to) do
+					if self:check_seat_group_access(pname, access) then
+						poss[#poss+1]={name=self.seat_groups[access].name, key="sgr_"..access}
+					end
+				end
+				if self.has_inventory and self.get_inventory_formspec and advtrains.check_driving_couple_protection(pname, data.owner, data.whitelist) then
+					poss[#poss+1]={name=attrans("Show Inventory"), key="inv"}
+				end
+				if self.seat_groups[sgr].driving_ctrl_access and advtrains.check_driving_couple_protection(pname, data.owner, data.whitelist) then
+					poss[#poss+1]={name=attrans("Onboard Computer"), key="bordcom"}
+				end
+				if data.owner==pname then
+					poss[#poss+1]={name=attrans("Wagon properties"), key="prop"}
+				end
+				if not self.seat_groups[sgr].require_doors_open or self:train().door_open~=0 then
+					poss[#poss+1]={name=attrans("Get off"), key="off"}
+				else
+					if clicker:get_player_control().sneak then
+						poss[#poss+1]={name=attrans("Get off (forced)"), key="off"}
+					else
+						poss[#poss+1]={name=attrans("(Doors closed)"), key="dcwarn"}
+					end
+				end
+				if #poss==0 then
+					--can't do anything.
+				elseif #poss==1 then
+					self:seating_from_key_helper(pname, {[poss[1].key]=true}, no)
+				else
+					local form = "size[5,"..1+(#poss).."]"
+					for pos,ent in ipairs(poss) do
+						form = form .. "button_exit[0.5,"..(pos-0.5)..";4,1;"..ent.key..";"..ent.name.."]"
+					end
+					minetest.show_formspec(pname, "advtrains_seating_"..self.id, form)
+				end
+			else
+				self:get_off(no)
+			end
+		else
+			--do not attach if already on a train
+			if advtrains.player_to_train_mapping[pname] then return end
+			if self.seat_groups then
+				if #self.seats==0 then
+					if self.has_inventory and self.get_inventory_formspec and advtrains.check_driving_couple_protection(pname, data.owner, data.whitelist) then
+						minetest.show_formspec(pname, "advtrains_inv_"..self.id, self:get_inventory_formspec(pname, make_inv_name(self.id)))
+					end
+					return
+				end
+				
+				local doors_open = self:train().door_open~=0 or clicker:get_player_control().sneak
+				local allow, rsn=false, "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
+						for seatid, seatdef in ipairs(self.seats) do
+							if seatdef.group==sgr then
+								if (not self.seat_groups[sgr].require_doors_open or doors_open) then
+									if not data.seatp[seatid] then
+										self:get_on(clicker, seatid)
+										return
+									else
+										rsn="Wagon is full."
+									end
+								else
+									rsn="Doors are closed! (try holding sneak key!)"
+								end
+							end
+						end
+					end
+				end
+				minetest.chat_send_player(pname, attrans("Can't get on: "..rsn))
+			else
+				self:show_get_on_form(pname)
+			end
+		end
+	end)
+end
+
+function wagon:get_on(clicker, seatno)
+	
+	local data = advtrains.wagons[self.id]
+		
+	if not data.seatp then data.seatp={}end
+	if not self.seatpc then self.seatpc={}end--player controls in driver stands
+	
+	if not self.seats[seatno] then return end
+	local oldno=self:get_seatno(clicker:get_player_name())
+	if oldno then
+		atprint("get_on: clearing oldno",seatno)
+		advtrains.player_to_train_mapping[clicker:get_player_name()]=nil
+		advtrains.clear_driver_hud(clicker:get_player_name())
+		data.seatp[oldno]=nil
+	end
+	if data.seatp[seatno] and data.seatp[seatno]~=clicker:get_player_name() then
+		atprint("get_on: throwing off",data.seatp[seatno],"from seat",seatno)
+		self:get_off(seatno)
+	end
+	atprint("get_on: attaching",clicker:get_player_name())
+	data.seatp[seatno] = clicker:get_player_name()
+	self.seatpc[seatno] = clicker:get_player_control_bits()
+	advtrains.player_to_train_mapping[clicker:get_player_name()]=data.train_id
+	clicker:set_attach(self.object, "", self.seats[seatno].attach_offset, {x=0,y=0,z=0})
+	clicker:set_eye_offset(self.seats[seatno].view_offset, self.seats[seatno].view_offset)
+end
+function wagon:get_off_plr(pname)
+	local no=self:get_seatno(pname)
+	if no then
+		self:get_off(no)
+	end
+end
+function wagon:get_seatno(pname)
+	
+	local data = advtrains.wagons[self.id]
+	
+	for no, cont in pairs(data.seatp) do
+		if cont==pname then
+			return no
+		end
+	end
+	return nil
+end
+function wagon:get_off(seatno)
+	
+	local data = advtrains.wagons[self.id]
+	
+	if not data.seatp[seatno] then return end
+	local pname = data.seatp[seatno]
+	local clicker = minetest.get_player_by_name(pname)
+	advtrains.player_to_train_mapping[pname]=nil
+	advtrains.clear_driver_hud(pname)
+	data.seatp[seatno]=nil
+	self.seatpc[seatno]=nil
+	if clicker then
+		atprint("get_off: detaching",clicker:get_player_name())
+		clicker:set_detach()
+		clicker:set_eye_offset({x=0,y=0,z=0}, {x=0,y=0,z=0})
+		local train=self:train()
+		--code as in step - automatic get on
+		if self.door_entry and train.door_open and train.door_open~=0 and train.velocity==0 and train.index and train.path then
+			local index = advtrains.path_get_index_by_offset(train, train.index, -data.pos_in_train)
+			for i, ino in ipairs(self.door_entry) do
+				--atdebug("using door-based",i,ino)
+				local fct=data.wagon_flipped and -1 or 1
+				local aci = advtrains.path_get_index_by_offset(train, index, ino*fct)
+				local ix1, ix2 = advtrains.path_get_adjacent(train, aci)
+				local d = train.door_open
+				if self.wagon_width then
+					d = d * math.floor(self.wagon_width/2)
+				end
+				-- the two wanted positions are ix1 and ix2 + (2nd-1st rotated by 90deg)
+				-- (x z) rotated by 90deg is (-z x)  (http://stackoverflow.com/a/4780141)
+				local add = { x = (ix2.z-ix1.z)*d, y = 0, z = (ix1.x-ix2.x)*d }
+				local oadd = { x = (ix2.z-ix1.z)*(d+train.door_open), y = 1, z = (ix1.x-ix2.x)*(d+train.door_open)}
+				local platpos=vector.round(vector.add(ix1, add))
+				local offpos=vector.round(vector.add(ix1, oadd))
+				
+				--atdebug("platpos:", platpos, "offpos:", offpos)
+				if minetest.get_item_group(minetest.get_node(platpos).name, "platform")>0 then
+					minetest.after(GETOFF_TP_DELAY, function() clicker:setpos(offpos) end)
+					--atdebug("tp",offpos)
+					return
+				end
+				--atdebug("nope")
+			end
+		end
+		--if not door_entry, or paths missing, fall back to old method
+		--atdebug("using fallback")
+		local objpos=advtrains.round_vector_floor_y(self.object:getpos())
+		local yaw=self.object:getyaw()
+		local isx=(yaw < math.pi/4) or (yaw > 3*math.pi/4 and yaw < 5*math.pi/4) or (yaw > 7*math.pi/4)
+		local offp
+		--abuse helper function
+		for _,r in ipairs({-1, 1}) do
+			--atdebug("offset",r)
+			local p=vector.add({x=isx and r or 0, y=0, z=not isx and r or 0}, objpos)
+			offp=vector.add({x=isx and r*2 or 0, y=1, z=not isx and r*2 or 0}, objpos)
+			--atdebug("platpos:", p, "offpos:", offp)
+			if minetest.get_item_group(minetest.get_node(p).name, "platform")>0 then
+				minetest.after(GETOFF_TP_DELAY, function() clicker:setpos(offp) end)
+				--atdebug("tp",offp)
+				return
+			end
+		end
+		--atdebug("nope")
+		
+	end
+end
+function wagon:show_get_on_form(pname)
+	if not self.initialized then return end
+	
+	local data = advtrains.wagons[self.id]
+	if #self.seats==0 then
+		if self.has_inventory and self.get_inventory_formspec and advtrains.check_driving_couple_protection(pname, data.owner, data.whitelist) then
+			minetest.show_formspec(pname, "advtrains_inv_"..self.id, self:get_inventory_formspec(pname, make_inv_name(self.id)))
+		end
+		return
+	end
+	local form, comma="size[5,8]label[0.5,0.5;"..attrans("Select seat:").."]textlist[0.5,1;4,6;seat;", ""
+	for seatno, seattbl in ipairs(self.seats) do
+		local addtext, colorcode="", ""
+		if data.seatp and data.seatp[seatno] then
+			colorcode="#FF0000"
+			addtext=" ("..data.seatp[seatno]..")"
+		end
+		form=form..comma..colorcode..seattbl.name..addtext
+		comma=","
+	end
+	form=form..";0,false]"
+	if self.has_inventory and self.get_inventory_formspec then
+		form=form.."button_exit[1,7;3,1;inv;"..attrans("Show Inventory").."]"
+	end
+	minetest.show_formspec(pname, "advtrains_geton_"..self.id, form)
+end
+function wagon:show_wagon_properties(pname)
+	--[[
+	fields: 
+	field: driving/couple whitelist
+	button: save
+	]]
+	local data = advtrains.wagons[self.id]
+	local form="size[5,5]"
+	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, "!")
+	end
+	form = form .. "field[0.5,3;4.5,1;fc;Freight Code:;"..fc.."]"
+	if data.fc then
+		if not data.fcind then data.fcind = 1 end
+		if data.fcind > 1 then
+			form=form.."button[0.5,3.5;1,1;fcp;prev FC]"
+		end
+		form=form.."label[1.5,3.5;Current FC:]"
+
+		local cur = data.fc[data.fcind] or ""
+		form=form.."label[1.5,3.75;"..minetest.formspec_escape(cur).."]"
+		form=form.."button[3.5,3.5;1,1;fcn;next FC]"
+	end
+	form=form.."button_exit[0.5,4.5;4,1;save;"..attrans("Save wagon properties").."]"
+	minetest.show_formspec(pname, "advtrains_prop_"..self.id, form)
+end
+
+--BordCom
+local function checkcouple(ent)
+	if not ent or not ent:getyaw() then
+		return nil
+	end
+	local le = ent:get_luaentity()
+	if not le or not le.is_couple then
+		return nil
+	end
+	return le
+end
+local function checklock(pname, own1, own2, wl1, wl2)
+	return advtrains.check_driving_couple_protection(pname, own1, wl1)
+		or advtrains.check_driving_couple_protection(pname, own2, wl2)
+end
+
+local function split(str, sep)
+   local fields = {}
+   local pattern = string.format("([^%s]+)", sep)
+   str:gsub(pattern, function(c) fields[#fields+1] = c end)
+   return fields
+end
+
+function wagon.set_fc(data, fcstr)
+	data.fc = split(fcstr, "!")
+	if not data.fcind then
+		data.fcind = 1
+	elseif data.fcind > #data.fc then
+		data.fcind = #data.fc
+	end	
+end
+
+function wagon.prev_fc(data)
+	if data.fcind > 1 then
+		data.fcind = data.fcind -1
+	end
+	if data.fcind == 1 and data.fcrev then
+		data.fcrev = nil
+	end
+end
+
+function wagon.next_fc(data)
+	if not data.fc then return end
+	if data.fcrev then
+		wagon.prev_fc(data)
+		return
+	end
+	if data.fcind < #data.fc then
+		data.fcind = data.fcind + 1
+	else
+		data.fcind = 1
+	end
+	if data.fcind == #data.fc and data.fc[data.fcind] == "?" then
+		data.fcrev = true
+		wagon.prev_fc(data)
+		return			
+	end
+end
+
+function advtrains.get_cur_fc(data)
+	if not ( data.fc and data.fcind ) then
+		return ""
+	end
+	return data.fc[data.fcind] or ""
+end
+
+function advtrains.step_fc(data)
+	wagon.next_fc(data)
+end
+
+
+
+
+
+function wagon:show_bordcom(pname)
+	if not self:train() then return end
+	local train = self:train()
+	local data = advtrains.wagons[self.id]
+	
+	local form = "size[11,9]label[0.5,0;AdvTrains Boardcom v0.1]"
+	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 "")).."]"
+	form=form.."field[7.5,3.25;3,1;routingcode;"..attrans("Routingcode")..";"..(minetest.formspec_escape(train.routingcode or "")).."]"
+	--row 5 : train overview and autocoupling
+	if train.velocity==0 then
+		form=form.."label[0.5,4;Train overview /coupling control:]"
+		linhei=5
+		local pre_own, pre_wl, owns_any = nil, nil, minetest.check_player_privs(pname, "train_admin")
+		for i, tpid in ipairs(train.trainparts) do
+			local ent = advtrains.wagons[tpid]
+			if ent then
+				local roadnumber = ent.roadnumber or ""
+				form = form .. string.format("button[%d,%d;%d,%d;%s;%s]", i, linhei, 1, 0.2, "wgprp"..i, roadnumber)
+				local ename = ent.type
+				form = form .. "item_image["..i..","..(linhei+0.5)..";1,1;"..ename.."]"
+				if i~=1 then
+					if checklock(pname, ent.owner, pre_own, ent.whitelist, pre_wl) then
+						form = form .. "image_button["..(i-0.5)..","..(linhei+1.5)..";1,1;advtrains_discouple.png;dcpl_"..i..";]"
+					end
+				end
+				if i == data.pos_in_trainparts then
+					form = form .. "box["..(i-0.1)..","..(linhei+0.4)..";1,1;green]"
+				end
+				pre_own = ent.owner
+				pre_wl = ent.whitelist
+				owns_any = owns_any or (not ent.owner or ent.owner==pname)
+			end
+		end
+		
+		if train.movedir==1 then
+			form = form .. "label["..(#train.trainparts+1)..","..(linhei)..";-->]"
+		else
+			form = form .. "label[0.5,"..(linhei)..";<--]"
+		end
+		--check cpl_eid_front and _back of train
+		local couple_front = checkcouple(train.cpl_front)
+		local couple_back = checkcouple(train.cpl_back)
+		if couple_front then
+			form = form .. "image_button[0.5,"..(linhei+1)..";1,1;advtrains_couple.png;cpl_f;]"
+		end
+		if couple_back then
+			form = form .. "image_button["..(#train.trainparts+0.5)..","..(linhei+1)..";1,1;advtrains_couple.png;cpl_b;]"
+		end
+		
+	else
+		form=form.."label[0.5,4.5;Train overview / coupling control is only shown when the train stands.]"
+	end
+	form = form .. "button[0.5,8;3,1;save;Save]"
+	
+	-- Interlocking functionality: If the interlocking module is loaded, you can set the signal aspect
+	-- from inside the train
+	if advtrains.interlocking and train.lzb and #train.lzb.oncoming > 0 then
+		local i=1
+		while train.lzb.oncoming[i] do
+			local oci = train.lzb.oncoming[i]
+			if oci.udata and oci.udata.signal_pos then
+				if advtrains.interlocking.db.get_sigd_for_signal(oci.udata.signal_pos) then
+					form = form .. "button[4.5,8;5,1;ilrs;Remote Routesetting]"
+					break
+				end
+			end
+			i=i+1
+		end
+	end
+	
+	minetest.show_formspec(pname, "advtrains_bordcom_"..self.id, form)
+end
+function wagon:handle_bordcom_fields(pname, formname, fields)
+	local data = advtrains.wagons[self.id]
+	
+	local seatno=self:get_seatno(pname)
+	if not seatno or not self.seat_groups[self.seats[seatno].group].driving_ctrl_access or not advtrains.check_driving_couple_protection(pname, data.owner, data.whitelist) then
+		return
+	end
+	local train = self:train()
+	if not train then return end
+	if fields.text_outside then
+		if fields.text_outside~="" then
+			train.text_outside=fields.text_outside
+		else
+			train.text_outside=nil
+		end
+	end
+	if fields.text_inside then
+		if fields.text_inside~="" then
+			train.text_inside=fields.text_inside
+		else
+			train.text_inside=nil
+		end
+	end
+	if fields.line then
+		if fields.line~="" then
+			if fields.line ~= train.line then
+				train.line=fields.line
+				minetest.after(0, advtrains.invalidate_path, train.id)
+			end
+		else
+			train.line=nil
+		end
+	end
+	if fields.routingcode then
+		if fields.routingcode~="" then
+			if fields.routingcode ~= train.routingcode then
+				train.routingcode=fields.routingcode
+				minetest.after(0, advtrains.invalidate_path, train.id)
+			end
+		else
+			train.routingcode=nil
+		end
+	end
+	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
+			end
+		end
+	end
+	--check cpl_eid_front and _back of train
+	local couple_front = checkcouple(train.cpl_front)
+	local couple_back = checkcouple(train.cpl_back)
+	
+	if fields.cpl_f and couple_front then
+		couple_front:on_rightclick(pname)
+	end
+	if fields.cpl_b and couple_back then
+		couple_back:on_rightclick(pname)
+	end
+	
+	-- Interlocking functionality: If the interlocking module is loaded, you can set the signal aspect
+	-- from inside the train
+	if fields.ilrs and advtrains.interlocking and train.lzb and #train.lzb.oncoming > 0 then
+		local i=1
+		while train.lzb.oncoming[i] do
+			local oci = train.lzb.oncoming[i]
+			if oci.udata and oci.udata.signal_pos then
+				local sigd = advtrains.interlocking.db.get_sigd_for_signal(oci.udata.signal_pos)
+				if sigd then
+					advtrains.interlocking.show_signalling_form(sigd, pname)
+					return
+				end
+			end
+			i=i+1
+		end
+	end
+	
+	
+	if not fields.quit then
+		self:show_bordcom(pname)
+	end
+end
+
+minetest.register_on_player_receive_fields(function(player, formname, fields)
+	return advtrains.pcall(function()
+		local uid=string.match(formname, "^advtrains_geton_(.+)$")
+		if uid then
+			for _,wagon in pairs(minetest.luaentities) do
+				if wagon.is_wagon and wagon.initialized and wagon.id==uid then
+					local data = advtrains.wagons[wagon.id]
+					if fields.inv then
+						if wagon.has_inventory and wagon.get_inventory_formspec then
+							minetest.show_formspec(player:get_player_name(), "advtrains_inv_"..uid, wagon:get_inventory_formspec(player:get_player_name(), make_inv_name(uid)))
+						end
+					elseif fields.seat then
+						local val=minetest.explode_textlist_event(fields.seat)
+						if val and val.type~="INV" and not data.seatp[player:get_player_name()] then
+						--get on
+							wagon:get_on(player, val.index)
+							--will work with the new close_formspec functionality. close exactly this formspec.
+							minetest.show_formspec(player:get_player_name(), formname, "")
+						end
+					end
+				end
+			end
+		end
+		uid=string.match(formname, "^advtrains_seating_(.+)$")
+		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
+					end
+				end
+			end
+		end
+		uid=string.match(formname, "^advtrains_prop_(.+)$")
+		if uid then
+			local pname=player:get_player_name()
+			local data = advtrains.wagons[uid]
+			if pname~=data.owner and not minetest.check_player_privs(pname, {train_admin = true}) then
+				return true
+			end
+			if fields.save or not fields.quit then
+				if fields.whitelist then
+					data.whitelist = fields.whitelist
+				end
+				if fields.roadnumber then
+					data.roadnumber = fields.roadnumber
+				end
+				if fields.fc then
+					wagon.set_fc(data, fields.fc)
+				end
+				if fields.fcp then
+					wagon.prev_fc(data)
+					wagon.show_wagon_properties({id=uid}, pname)
+				end
+				if fields.fcn then
+					advtrains.step_fc(data)
+					wagon.show_wagon_properties({id=uid}, pname)
+				end
+			end
+		end
+		uid=string.match(formname, "^advtrains_bordcom_(.+)$")
+		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
+			end
+		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
+				end
+			end
+		end
+	end)
+end)
+function wagon:seating_from_key_helper(pname, fields, no)
+	local data = advtrains.wagons[self.id]
+	local sgr=self.seats[no].group
+	for _,access in ipairs(self.seat_groups[sgr].access_to) do
+		if fields["sgr_"..access] and self:check_seat_group_access(pname, access) then
+			for seatid, seatdef in ipairs(self.seats) do
+				if seatdef.group==access and not data.seatp[seatid] then
+					self:get_on(minetest.get_player_by_name(pname), seatid)
+					return
+				end
+			end
+		end
+	end
+	if fields.inv and self.has_inventory and self.get_inventory_formspec then
+		minetest.close_formspec(pname, "advtrains_seating_"..self.id)
+		minetest.show_formspec(pname, "advtrains_inv_"..self.id, self:get_inventory_formspec(pname, make_inv_name(self.id)))
+	end
+	if fields.prop and data.owner==pname then
+		minetest.close_formspec(pname, "advtrains_seating_"..self.id)
+		self:show_wagon_properties(pname)
+	end
+	if fields.bordcom and self.seat_groups[sgr].driving_ctrl_access and advtrains.check_driving_couple_protection(pname, data.owner, data.whitelist) then
+		minetest.close_formspec(pname, "advtrains_seating_"..self.id)
+		self:show_bordcom(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!"))
+	end
+	if fields.off then
+		self:get_off(no)
+	end
+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!"
+	end
+	if self.seat_groups[sgr].driving_ctrl_access then
+		advtrains.log("Drive", pname, self.object:getpos(), self:train().text_outside)
+	end
+	return true
+end
+function wagon:reattach_all()
+	local data = advtrains.wagons[self.id]
+	if not data.seatp then data.seatp={} end
+	for seatno, pname in pairs(data.seatp) do
+		local p=minetest.get_player_by_name(pname)
+		if p then
+			self:get_on(p ,seatno)
+		end
+	end
+end
+
+local function check_twagon_owner(train, b_first, pname)
+	local wtp = b_first and 1 or #train.trainparts
+	local wid = train.trainparts[wtp]
+	local wdata = advtrains.wagons[wid]
+	if wdata then
+		return advtrains.check_driving_couple_protection(pname, wdata.owner, wdata.whitelist)
+	end
+	return false
+end
+
+function advtrains.safe_couple_trains(id1, id2, t1f, t2f, pname, try_run,v1,v2)
+	
+	if pname and not minetest.check_player_privs(pname, "train_operator") then
+		minetest.chat_send_player(pname, "Missing train_operator privilege")
+		return false
+	end
+	
+	local train1=advtrains.trains[id1]
+	local train2=advtrains.trains[id2]
+	
+	if not advtrains.train_ensure_init(id1, train1)
+		or not advtrains.train_ensure_init(id2, train2) then
+		return false
+	end
+	local wck_t1, wck_t2
+	if pname then
+		wck_t1 = check_twagon_owner(train1, t1f, pname)
+		wck_t2 = check_twagon_owner(train2, t2f, pname)
+	end
+	if (wck_t1 or wck_t2) or not pname then
+		if not v1 then
+			v1 = 0
+		end
+		if not v2 then
+			v2 = 0
+		end
+		if try_run then
+			return true
+		end
+		if t1f then
+			if t2f then
+				v1 = -v1
+				advtrains.invert_train(id1)
+				advtrains.do_connect_trains(id1, id2, v1+v2)
+			else
+				advtrains.do_connect_trains(id2, id1, v1+v2)
+			end
+		else
+			if t2f then
+				advtrains.do_connect_trains(id1, id2, v1+v2)
+			else
+				v2 = -v2
+				advtrains.invert_train(id2)
+				advtrains.do_connect_trains(id1, id2, v1+v2)
+			end
+		end
+		return true
+	else
+		minetest.chat_send_player(pname, "You must be authorized for at least one wagon.")
+		return false
+	end
+end
+
+
+function advtrains.safe_decouple_wagon(w_id, pname, try_run)
+	if not minetest.check_player_privs(pname, "train_operator") then
+		minetest.chat_send_player(pname, "Missing train_operator privilege")
+		return false
+	end
+	local data = advtrains.wagons[w_id]
+	
+	local dpt = data.pos_in_trainparts
+	if not dpt or dpt <= 1 then
+		return false
+	end
+	local train = advtrains.trains[data.train_id]
+	local owid = train.trainparts[dpt-1]
+	local owdata = advtrains.wagons[owid]
+	
+	if not owdata then
+		return
+	end
+	
+	if not checklock(pname, data.owner, owdata.owner, data.whitelist, owdata.whitelist) then
+		minetest.chat_send_player(pname, "Not allowed to do this.")
+		return false
+	end
+	
+	if try_run then
+		return true
+	end
+	
+	advtrains.log("Discouple", pname, train.last_pos, train.text_outside)
+	advtrains.split_train_at_wagon(w_id)
+	return true
+end
+
+
+
+function advtrains.get_wagon_prototype(data)
+	local wt = data.type
+	if not wt then
+		-- LEGACY: Field was called "entity_name" in previous versions
+		wt = data.entity_name
+		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"
+	end
+	return wt, advtrains.wagon_prototypes[wt]
+end
+
+function advtrains.standard_inventory_formspec(self, pname, invname)
+	--[[minetest.chat_send_player(pname, string.format("self=%s, pname=%s, invname=%s", self, pname, invname))
+	for k,v in pairs(self) do
+		minetest.chat_send_player(pname, string.format("%s=%s", k,v))
+	end
+	minetest.chat_send_player(pname, string.format("***%s***", self.object:get_pos()))--]]
+	local data = advtrains.wagons[self.id]
+	local r = "size[8,11]"..
+			"list["..invname..";box;0,0;8,3;]"
+	if data.owner==pname then
+		r = r .. "button_exit[0,9;4,1;prop;"..attrans("Wagon properties").."]"
+	end
+	r = r .. "list[current_player;main;0,5;8,4;]"..
+			"listring[]"
+	return r
+end
+
+function advtrains.register_wagon(sysname_p, prototype, desc, inv_img, nincreative)
+	local sysname = sysname_p
+	if not string.match(sysname, ":") then
+		sysname = "advtrains:"..sysname_p
+	end
+	setmetatable(prototype, {__index=wagon})
+	minetest.register_entity(":"..sysname,prototype)
+	advtrains.wagon_prototypes[sysname] = prototype
+	
+	minetest.register_craftitem(":"..sysname, {
+		description = desc,
+		inventory_image = inv_img,
+		wield_image = inv_img,
+		stack_max = 1,
+		
+		groups = { not_in_creative_inventory = nincreative and 1 or 0},
+		
+		on_place = function(itemstack, placer, pointed_thing)
+			return advtrains.pcall(function()
+				if not pointed_thing.type == "node" then
+					return
+				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
+				local nodename=node.name
+				if(not advtrains.is_track_and_drives_on(nodename, prototype.drives_on)) 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.")
+					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
+					return itemstack
+				end
+				local tconns=advtrains.get_track_connections(node.name, node.param2)
+				local yaw = placer:get_look_horizontal()
+				local plconnid = advtrains.yawToClosestConn(yaw, tconns)
+				
+				local prevpos = advtrains.get_adjacent_rail(pointed_thing.under, tconns, plconnid, prototype.drives_on)
+				if not prevpos then
+					minetest.chat_send_player(pname, "The track you are trying to place the wagon on is not long enough!")
+					return
+				end
+				
+				local wid = advtrains.create_wagon(sysname, pname)
+				
+				local id=advtrains.create_new_train_at(pointed_thing.under, plconnid, 0, {wid})
+				
+				if not advtrains.is_creative(pname) then
+					itemstack:take_item()
+				end
+				return itemstack
+				
+			end)
+		end,
+	})
+end
+
+-- Placeholder wagon. Will be spawned whenever a mod is missing
+advtrains.register_wagon("advtrains:wagon_placeholder", {
+	visual="sprite",
+	textures = {"advtrains_wagon_placeholder.png"},
+	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 = {
+	},
+	seat_groups = {
+	},
+	assign_to_seat_group = {},
+	wagon_span=1,
+	drops={},
+}, "Wagon placeholder", "advtrains_wagon_placeholder.png", true)
+
diff --git a/advtrains/advtrains_interlocking/approach.lua b/advtrains/advtrains_interlocking/approach.lua
new file mode 100644
index 0000000..8e90b5a
--- /dev/null
+++ b/advtrains/advtrains_interlocking/approach.lua
@@ -0,0 +1,113 @@
+-- Interlocking counterpart of LZB, which has been moved into the core...
+-- Registers LZB callback for signal management.
+
+--[[
+usage of lzbdata:
+{
+	travsht = boolean indicating whether the train will be a shunt move at "trav"
+	travspd = speed restriction at end of traverser
+	travwspd = warning speed res.t
+}
+]]
+
+local SHUNT_SPEED_MAX = advtrains.SHUNT_SPEED_MAX
+
+local il = advtrains.interlocking
+
+local function get_over_function(speed, shunt)
+	return function(pos, id, train, index, speed, lzbdata)
+		if speed == 0 and minetest.settings:get_bool("at_il_force_lzb_halt") then
+			atwarn(id,"overrun LZB 0 restriction (red signal) ",pos)
+			-- Set train 1 index backward. Hope this does not lead to bugs...
+			train.index = index - 0.5
+			train.velocity = 0
+			train.ctrl.lzb = 0
+			minetest.after(0, advtrains.invalidate_path, id)
+		else
+			train.speed_restriction = speed
+			train.is_shunt = shunt
+		end
+	end
+end
+
+advtrains.tnc_register_on_approach(function(pos, id, train, index, lzbdata)
+
+	--atdebug(id,"IL ApprC",pos,index,lzbdata)
+	--train.debug = advtrains.print_concat_table({train.is_shunt,"|",index,"|",lzbdata})
+
+	local pts = advtrains.roundfloorpts(pos)
+	local cn  = train.path_cn[index]
+	local travsht = lzbdata.travsht
+	
+	if travsht==nil then
+		travsht = train.is_shunt
+	end
+	
+	local travspd = lzbdata.travspd
+	local travwspd = lzbdata.travwspd
+	
+	-- check for signal
+	local asp, spos = il.db.get_ip_signal_asp(pts, cn)
+	
+	-- do ARS if needed
+	if spos 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
+	end
+	--atdebug("trav: ",pos, cn, asp, spos, "travsht=", lzb.travsht)
+	local lspd
+	if asp then
+		--atdebug(id,"IL Signal",spos,asp)
+		local nspd = 0
+		--interpreting aspect and determining speed to proceed
+		if travsht then
+			--shunt move
+			if asp.shunt.free then
+				nspd = SHUNT_SPEED_MAX
+			elseif asp.shunt.proceed_as_main and asp.main.free then
+				nspd = asp.main.speed
+				travsht = false
+			end
+		else
+			--train move
+			if asp.main.free then
+				nspd = asp.main.speed
+			elseif asp.shunt.free then
+				nspd = SHUNT_SPEED_MAX
+				travsht = true
+			end
+		end
+		-- nspd can now be: 1. !=0: new speed restriction, 2. =0: stop here or 3. nil: keep travspd
+		if nspd then
+			if nspd == -1 then
+				travspd = nil
+			else
+				travspd = nspd
+			end
+		end
+		
+		local nwspd = asp.info.w_speed
+		if nwspd then
+			if nwspd == -1 then
+				travwspd = nil
+			else
+				travwspd = nwspd
+			end
+		end
+		--atdebug("ns,wns,ts,wts", nspd, nwspd, travspd, travwspd)
+		lspd = travspd
+		if travwspd and (not lspd or lspd>travwspd) then
+			lspd = travwspd
+		end
+		
+		local udata = {signal_pos = spos}
+		local callback = get_over_function(lspd, travsht)
+		advtrains.lzb_add_checkpoint(train, index, lspd, callback, udata)
+	end
+	lzbdata.travsht = travsht
+	lzbdata.travspd = travspd
+	lzbdata.travwspd = travwspd
+end)
diff --git a/advtrains/advtrains_interlocking/ars.lua b/advtrains/advtrains_interlocking/ars.lua
new file mode 100644
index 0000000..434ae2c
--- /dev/null
+++ b/advtrains/advtrains_interlocking/ars.lua
@@ -0,0 +1,155 @@
+-- ars.lua
+-- automatic routesetting
+
+--[[
+	The "ARS table" and its effects:
+	Every route has (or can have) an associated ARS table. This can either be
+	ars = { [n] = {ln="<line>"}/{rc="<routingcode>"}/{c="<a comment>"} }
+	a list of rules involving either line or routingcode matchers (or comments, those are ignored)
+	The first matching rule determines the route to set.
+	- or -
+	ars = {default = true}
+	this means that all trains that no other rule matches on should use this route
+	
+	Compound ("and") conjunctions are not supported (--TODO should they?)
+	
+	For editing, those tables are transformed into lines in a text area:
+	{ln=...} -> LN ...
+	{rc=...} -> RC ...
+	{c=...}  -> #...
+	{default=true} -> *
+	See also route_ui.lua
+]]
+
+local il = advtrains.interlocking
+
+-- The ARS data are saved in a table format, but are entered in text format. Utility functions to transform between both.
+function il.ars_to_text(arstab)
+	if not arstab then
+		return ""
+	end
+	
+	local txt = {}
+
+	for i, arsent in ipairs(arstab) do
+		local n = ""
+		if arsent.n then
+			n = "!"
+		end
+		if arsent.ln then
+			txt[#txt+1] = n.."LN "..arsent.ln
+		elseif arsent.rc then
+			txt[#txt+1] = n.."RC "..arsent.rc
+		elseif arsent.c then
+			txt[#txt+1] = "#"..arsent.c
+		end
+	end
+	
+	if arstab.default then
+		return "*\n" .. table.concat(txt, "\n")
+	end
+	return table.concat(txt, "\n")
+end
+
+function il.text_to_ars(t)
+	if t=="" then
+		return nil
+	elseif t=="*" then
+		return {default=true}
+	end
+	local arstab = {}
+	for line in string.gmatch(t, "[^\r\n]+") do
+		if line=="*" then
+			arstab.default = true
+		else
+			local c, v = string.match(line, "^(...?)%s(.*)$")
+			if c and v then
+				local n = nil
+				if string.sub(c,1,1) == "!" then
+					n = true
+					c = string.sub(c,2)
+				end
+				local tt=string.upper(c)
+				if tt=="LN" then
+					arstab[#arstab+1] = {ln=v, n=n}
+				elseif tt=="RC" then
+					arstab[#arstab+1] = {rc=v, n=n}
+				end
+			else
+				local ct = string.match(line, "^#(.*)$")
+				if ct then arstab[#arstab+1] = {c = ct} end
+			end
+		end
+	end
+	return arstab
+end
+
+local function find_rtematch(routes, train)
+	local default
+	for rteid, route in ipairs(routes) do
+		if route.ars then
+			if route.ars.default then
+				default = rteid
+			else
+				if il.ars_check_rule_match(route.ars, train) then
+					return rteid
+				end
+			end
+		end
+	end
+	return default
+end
+
+-- Checks whether ARS rule explicitly matches. This does not take into account the "default" field, since a wider context is required for this.
+-- Returns the rule number that matched, or nil if nothing matched
+function il.ars_check_rule_match(ars, train)
+		if not ars then
+			return nil
+		end
+		local line = train.line
+		local routingcode = train.routingcode
+		for arskey, arsent in ipairs(ars) do
+			--atdebug(arsent, line, routingcode)
+			if arsent.n then
+				-- rule is inverse...
+				if arsent.ln and (not line or arsent.ln ~= line) then
+					return arskey
+				elseif arsent.rc and (not routingcode or not string.find(" "..routingcode.." ", " "..arsent.rc.." ", nil, true)) then
+					return arskey
+				end
+				return nil
+			end
+				
+			if arsent.ln and line and arsent.ln == line then
+				return arskey
+			elseif arsent.rc and routingcode and string.find(" "..routingcode.." ", " "..arsent.rc.." ", nil, true) then
+				return arskey
+			end
+		end
+		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 then
+		-- No-ARS mode of signal.
+		-- ignore...
+		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
diff --git a/advtrains/advtrains_interlocking/database.lua b/advtrains/advtrains_interlocking/database.lua
new file mode 100644
index 0000000..e2c9edc
--- /dev/null
+++ b/advtrains/advtrains_interlocking/database.lua
@@ -0,0 +1,599 @@
+-- interlocking/database.lua
+-- 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 continues along the route.
+Whenever train leaves a TC
+-> 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
+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.
+Imagine this setup: (T=Train, R=Route, >=in_dir TCB)
+    O-|  Royston P2 |-O
+T->---|->RRR-|->RRR-|--
+Train T enters from the left, the route is set to the right signal. But train is supposed to reverse here and stops this way:
+    O-|  Royston P2 |-O
+------|-TTTT-|->RRR-|--
+The "Route" on the right is still set. Imposing a timeout here is a thing only professional engineers can determine, not an algorithm.
+    O-|  Royston P2 |-O
+<-T---|------|->RRR-|--
+The train has left again, while route on the right is still set.
+So, we have to clear the set route when the train has left the left TC.
+This does not conflict with call-on routes, because both station tracks are set as "allow call-on"
+Because none of the routes extends past any non-call-on sections, call-on route would be allowed here, even though the route
+is locked in opposite direction at the time of routesetting.
+Another case of this:
+--TTT/--|->RRR--
+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.
+]]--
+
+local TRAVERSER_LIMIT = 1000
+
+
+local ildb = {}
+
+local track_circuit_breaks = {}
+local track_sections = {}
+
+-- Assignment of signals to TCBs
+local signal_assignments = {}
+
+-- track+direction -> signal position
+local influence_points = {}
+
+advtrains.interlocking.npr_rails = {}
+
+
+function ildb.load(data)
+	if not data then return end
+	if data.tcbs then
+		track_circuit_breaks = data.tcbs
+	end
+	if data.ts then
+		track_sections = data.ts
+	end
+	if data.signalass then
+		signal_assignments = data.signalass
+	end
+	if data.rs_locks then
+		advtrains.interlocking.route.rte_locks = data.rs_locks
+	end
+	if data.rs_callbacks then
+		advtrains.interlocking.route.rte_callbacks = data.rs_callbacks
+	end
+	if data.influence_points then
+		influence_points = data.influence_points
+	end
+	if data.npr_rails then
+		advtrains.interlocking.npr_rails = data.npr_rails
+	end
+end
+
+function ildb.save()
+	return {
+		tcbs = track_circuit_breaks,
+		ts=track_sections,
+		signalass = signal_assignments,
+		rs_locks = advtrains.interlocking.route.rte_locks,
+		rs_callbacks = advtrains.interlocking.route.rte_callbacks,
+		influence_points = influence_points,
+		npr_rails = advtrains.interlocking.npr_rails,
+	}
+end
+
+--
+--[[
+TCB data structure
+{
+[1] = { -- Variant: with adjacent TCs.
+	ts_id = <id> -- ID of the assigned track section
+	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
+	-- train has passed the signal. (which will set the aspect to "danger" again)
+	route_committed = <boolean> -- When setting/requesting a route, routetar will be set accordingly,
+	-- while the signal still displays danger and nothing is written to the TCs
+	-- As soon as the route can actually be set, all relevant TCs and turnouts are set and this field
+	-- is set true, clearing the signal
+	aspect = <asp> -- The aspect the signal should show. If this is nil, should show the most restrictive aspect (red)
+	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)
+},
+[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.
+}
+}
+
+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
+	route = {
+		origin = <signal>,  -- route origin
+		entry = <sigd>,     -- supposed train entry point
+		rsn = <string>,
+		first = <bool>
+	}
+	route_post = {
+		locks = {[n] = <pts>}
+		next = <sigd>
+	}
+	-- Set whenever a route has been set through this TC. It saves the origin tcb id and side
+	-- (=the origin signal). rsn is some description to be shown to the user
+	-- 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
+}
+
+
+Signal specifier (sigd) (a pair of TCB/Side):
+{p = <pos>, s = <1/2>}
+
+Signal Assignments: reverse lookup of signals assigned to TCBs
+signal_assignments = {
+[<signal pts>] = <sigd>
+}
+]]
+
+
+--
+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
+
+function ildb.get_tcb(pos)
+	local pts = advtrains.roundfloorpts(pos)
+	return track_circuit_breaks[pts]
+end
+
+function ildb.get_tcbs(sigd)
+	local tcb = ildb.get_tcb(sigd.p)
+	if not tcb then return nil end
+	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 = "Section "..id,
+		tc_breaks = { sigd }
+	}
+	tcbs.ts_id = id
+end
+
+function ildb.get_ts(id)
+	return track_sections[id]
+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
+	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
+	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
+		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
+		end
+	end
+	return counter_hit
+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
+		end
+		advtrains.interlocking.show_tcb_marker(msigd.p)
+	end
+	-- done
+	track_sections[merge_id] = nil
+end
+
+local lntrans = { "A", "B" }
+local function sigd_to_string(sigd)
+	return minetest.pos_to_string(sigd.p).." / "..lntrans[sigd.s]
+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
+	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 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)
+			else
+				--atdebug("Sync: put",sigd_to_string(sigd),"into list_ok")
+				ts_id = tcbs.ts_id
+				table.insert(list_ok, sigd)
+			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)
+		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)
+		end
+	end
+end
+
+function ildb.link_track_sections(merge_id, root_id)
+	if merge_id == root_id then
+		return
+	end
+	merge_ts(root_id, merge_id)
+end
+
+function ildb.remove_from_interlocking(sigd)
+	local tcbs = ildb.get_tcbs(sigd)
+	if not ildb.may_modify_tcbs(tcbs) then return false end
+	
+	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
+		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)
+			else
+				idx = idx + 1
+			end
+		end
+		tcbs.ts_id = nil
+		
+		--ildb.sync_tcb_neighbors(sigd.p, sigd.s)
+		
+		if #ts.tc_breaks == 0 then
+			track_sections[tsid] = nil
+		end
+	end
+	advtrains.interlocking.show_tcb_marker(sigd.p)
+	if tcbs.signal then
+		return false
+	end
+	return true
+end
+
+function ildb.remove_tcb(pos)
+	local pts = advtrains.roundfloorpts(pos)
+	if not track_circuit_breaks[pts] then return end
+	for connid=1,2 do
+		if not ildb.remove_from_interlocking({p=pos, s=connid}) then
+			return false
+		end
+	end
+	track_circuit_breaks[pts] = nil
+	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)
+	end
+	-- Note: ts gets removed in the moment of the removal of the last TCB.
+	return true
+end
+
+-- Returns true if it is allowed to modify any property of a track section, such as
+-- - removing TCBs
+-- - merging and dissolving sections
+-- As of now the action will be denied if a route is set or if a train is in the section.
+function ildb.may_modify_ts(ts)
+	if ts.route or ts.route_post or (ts.trains and #ts.trains>0) then
+		return false
+	end
+	return true
+end
+
+
+function ildb.may_modify_tcbs(tcbs)
+	if tcbs.ts_id then
+		local ts = ildb.get_ts(tcbs.ts_id)
+		if ts and not ildb.may_modify_ts(ts) then
+			return false
+		end
+	end
+	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
+
+
+-- returns the sigd the signal at pos belongs to, if this is known
+function ildb.get_sigd_for_signal(pos)
+	local pts = advtrains.roundfloorpts(pos)
+	local sigd = signal_assignments[pts]
+	if sigd then
+		if not ildb.get_tcbs(sigd) then
+			signal_assignments[pts] = nil
+			return nil
+		end
+		return sigd
+	end
+	return nil
+end
+function ildb.set_sigd_for_signal(pos, sigd)
+	local pts = advtrains.roundfloorpts(pos)
+	signal_assignments[pts] = sigd
+end
+
+-- checks if there's any influence point set to this position
+function ildb.is_ip_at(pos)
+	local pts = advtrains.roundfloorpts(pos)
+	if influence_points[pts] then
+		return true
+	end
+	return false
+end
+
+-- checks if a signal is influencing here
+function ildb.get_ip_signal(pts, connid)
+	if influence_points[pts] then
+		return influence_points[pts][connid]
+	end
+end
+
+-- Tries to get aspect to obey here, if there
+-- is a signal ip at this location
+-- auto-clears invalid assignments
+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)
+		if not asp then
+			atlog("Clearing orphaned signal influence point", pts, "/", connid)
+			ildb.clear_ip_signal(pts, connid)
+			return nil
+		end
+		return asp, p
+	end
+	return nil
+end
+
+-- set signal assignment.
+function ildb.set_ip_signal(pts, connid, spos)
+	ildb.clear_ip_by_signalpos(spos)
+	if not influence_points[pts] then
+		influence_points[pts] = {}
+	end
+	influence_points[pts][connid] = spos
+end
+-- clear signal assignment.
+function ildb.clear_ip_signal(pts, connid)
+	influence_points[pts][connid] = nil
+	for _,_ in pairs(influence_points[pts]) do
+		return
+	end
+	influence_points[pts] = nil
+end
+
+function ildb.get_ip_by_signalpos(spos)
+	for pts,tab in pairs(influence_points) do
+		for connid,pos in pairs(tab) do
+			if vector.equals(pos, spos) then
+				return pts, connid
+			end
+		end
+	end
+end
+-- clear signal assignment given the signal position
+function ildb.clear_ip_by_signalpos(spos)
+	local pts, connid = ildb.get_ip_by_signalpos(spos)
+	if pts then ildb.clear_ip_signal(pts, connid) end
+end
+
+
+advtrains.interlocking.db = ildb
+
+
+
+
diff --git a/advtrains/advtrains_interlocking/demosignals.lua b/advtrains/advtrains_interlocking/demosignals.lua
new file mode 100644
index 0000000..ab7a8b6
--- /dev/null
+++ b/advtrains/advtrains_interlocking/demosignals.lua
@@ -0,0 +1,111 @@
+-- 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 not asp.main.free then
+		advtrains.ndb.swap_node(pos, {name="advtrains_interlocking:ds_danger"})
+	else
+		if asp.dst.free and asp.main.speed == -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 = {
+			free = nil,
+			speed = {6, -1},
+		},
+		dst = {
+			free = nil,
+			speed = nil,
+		},
+		shunt = {
+			free = false,
+			proceed_as_main = true,
+		},
+		info = {
+			call_on = false,
+			dead_end = false,
+			w_speed = nil,
+		}
+}
+
+minetest.register_node("advtrains_interlocking:ds_danger", {
+	description = "Demo signal at Danger",
+	tiles = {"at_il_signal_asp_danger.png"},
+	groups = {
+		cracky = 3,
+		advtrains_signal = 2,
+		save_in_at_nodedb = 1,
+	},
+	sounds = default.node_sound_stone_defaults(),
+	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,
+})
+minetest.register_node("advtrains_interlocking:ds_free", {
+	description = "Demo signal at Free",
+	tiles = {"at_il_signal_asp_free.png"},
+	groups = {
+		cracky = 3,
+		advtrains_signal = 2,
+		save_in_at_nodedb = 1,
+	},
+	sounds = default.node_sound_stone_defaults(),
+	advtrains = {
+		set_aspect = setaspect,
+		supported_aspects = suppasp,
+		get_aspect = function(pos, node)
+			return {
+				main = {
+					free = true,
+					speed = -1,
+				}
+			}
+		end,
+	},
+	on_rightclick = advtrains.interlocking.signal_rc_handler,
+	can_dig = advtrains.interlocking.signal_can_dig,
+})
+minetest.register_node("advtrains_interlocking:ds_slow", {
+	description = "Demo signal at Slow",
+	tiles = {"at_il_signal_asp_slow.png"},
+	groups = {
+		cracky = 3,
+		advtrains_signal = 2,
+		save_in_at_nodedb = 1,
+	},
+	sounds = default.node_sound_stone_defaults(),
+	advtrains = {
+		set_aspect = setaspect,
+		supported_aspects = suppasp,
+		get_aspect = function(pos, node)
+			return {
+				main = {
+					free = true,
+					speed = 6,
+				}
+			}
+		end,
+	},
+	on_rightclick = advtrains.interlocking.signal_rc_handler,
+	can_dig = advtrains.interlocking.signal_can_dig,
+})
+
diff --git a/advtrains/advtrains_interlocking/depends.txt b/advtrains/advtrains_interlocking/depends.txt
new file mode 100644
index 0000000..fdf6b17
--- /dev/null
+++ b/advtrains/advtrains_interlocking/depends.txt
@@ -0,0 +1,2 @@
+advtrains
+advtrains_train_track?
+\ No newline at end of file
diff --git a/advtrains/advtrains_interlocking/init.lua b/advtrains/advtrains_interlocking/init.lua
new file mode 100644
index 0000000..a2f5882
--- /dev/null
+++ b/advtrains/advtrains_interlocking/init.lua
@@ -0,0 +1,30 @@
+-- Advtrains interlocking system
+-- See database.lua for a detailed explanation
+
+advtrains.interlocking = {}
+
+advtrains.SHUNT_SPEED_MAX = 6
+
+function advtrains.interlocking.sigd_equal(sigd, cmp)
+	return vector.equals(sigd.p, cmp.p) and sigd.s==cmp.s
+end
+
+
+local modpath = minetest.get_modpath(minetest.get_current_modname()) .. DIR_DELIM
+
+dofile(modpath.."database.lua")
+dofile(modpath.."signal_api.lua")
+dofile(modpath.."demosignals.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.."tool.lua")
+
+dofile(modpath.."approach.lua")
+dofile(modpath.."ars.lua")
+dofile(modpath.."tsr_rail.lua")
+
+
+minetest.register_privilege("interlocking", {description = "Can set up track sections, routes and signals.", give_to_singleplayer = true})
diff --git a/advtrains/advtrains_interlocking/models/at_il_tcb_node.obj b/advtrains/advtrains_interlocking/models/at_il_tcb_node.obj
new file mode 100644
index 0000000..bb6aab5
--- /dev/null
+++ b/advtrains/advtrains_interlocking/models/at_il_tcb_node.obj
@@ -0,0 +1,248 @@
+# Blender v2.76 (sub 0) OBJ File: ''
+# www.blender.org
+mtllib at_il_tcb_node.mtl
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diff --git a/advtrains/advtrains_interlocking/route_prog.lua b/advtrains/advtrains_interlocking/route_prog.lua
new file mode 100644
index 0000000..eadfd93
--- /dev/null
+++ b/advtrains/advtrains_interlocking/route_prog.lua
@@ -0,0 +1,548 @@
+-- Route programming system
+
+--[[
+Progamming routes:
+1. Select "program new route" in the signalling dialog
+-> route_start marker will appear to designate route-program mode
+2. Do those actions in any order:
+A. punch a TCB marker node to proceed route along this TCB. This will only work if
+	this is actually a TCB bordering the current TS, and will place a
+	route_set marker and shift to the next TS
+B. right-click a turnout to switch it (no impact to route programming
+C. punch a turnout (or some other passive component) to fix its state (toggle)
+	for the route. A sprite telling "Route Fix" will show that fact.
+3. To complete route setting, use the chat command '/at_program_route <route name>'.
+	The last punched TCB will get a 'route end' marker
+	The end of a route should be at another signal facing the same direction as the entrance signal,
+	however this is not enforced and left up to the signal engineer (the programmer)
+	
+The route visualization will also be used to visualize routes after they have been programmed.
+]]--
+
+
+-- table with objectRefs
+local markerent = {}
+
+minetest.register_entity("advtrains_interlocking:routemarker", {
+	visual = "mesh",
+	mesh = "trackplane.b3d",
+	textures = {"at_il_route_set.png"},
+	collisionbox = {-1,-0.5,-1, 1,-0.4,1},
+	visual_size = {x=10, y=10},
+	on_punch = function(self)
+		self.object:remove()
+	end,
+	get_staticdata = function() return "STATIC" end,
+	on_activate = function(self, sdata) if sdata=="STATIC" then self.object:remove() end end,
+	static_save = false,
+})
+
+
+-- Spawn or update a route marker entity
+-- pos: position where this is going to be
+-- key: something unique to determine which entity to remove if this was set before
+-- img: texture
+local function routemarker(context, pos, key, img, yaw, itex)
+	if not markerent[context] then
+		markerent[context] = {}
+	end
+	if markerent[context][key] then
+		markerent[context][key]:remove()
+	end
+	
+	local obj = minetest.add_entity(vector.add(pos, {x=0, y=0.3, z=0}), "advtrains_interlocking:routemarker")
+	if not obj then return end
+	obj:set_yaw(yaw)
+	obj:set_properties({
+		infotext = itex,
+		textures = {img},
+	})
+	
+	markerent[context][key] = obj
+end
+
+minetest.register_entity("advtrains_interlocking:routesprite", {
+	visual = "sprite",
+	textures = {"at_il_turnout_free.png"},
+	collisionbox = {-0.2,-0.2,-0.2, 0.2,0.2,0.2},
+	visual_size = {x=1, y=1},
+	on_punch = function(self)
+		if self.callback then
+			self.callback()
+		end
+		self.object:remove()
+	end,
+	get_staticdata = function() return "STATIC" end,
+	on_activate = function(self, sdata) if sdata=="STATIC" then self.object:remove() end end,
+	static_save = false,
+})
+
+
+-- Spawn or update a route sprite entity
+-- pos: position where this is going to be
+-- key: something unique to determine which entity to remove if this was set before
+-- img: texture
+local function routesprite(context, pos, key, img, itex, callback)
+	if not markerent[context] then
+		markerent[context] = {}
+	end
+	if markerent[context][key] then
+		markerent[context][key]:remove()
+	end
+	
+	local obj = minetest.add_entity(vector.add(pos, {x=0, y=0, z=0}), "advtrains_interlocking:routesprite")
+	if not obj then return end
+	obj:set_properties({
+		infotext = itex,
+		textures = {img},
+	})
+	
+	if callback then
+		obj:get_luaentity().callback = callback
+	end
+	
+	markerent[context][key] = obj
+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 = 
+}
+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:
+- all route locks of the segment on TS between the (i-1). and the i. TCB
+- the next TCB signal describer in proceeding direction of the route.
+'Terminal' once again repeats the "next" entry of the last route segment.
+It is needed for distant signal aspect determination. If it is not set,
+the distant signal aspect is determined as DANGER.
+]]--
+
+local function chat(pname, message)
+	minetest.chat_send_player(pname, "[Route programming] "..message)
+end
+local function clear_lock(locks, pname, pts)
+	locks[pts] = nil
+	chat(pname, pts.." is no longer affected when this route is set.")
+end
+
+local function otherside(s)
+	if s==1 then return 2 else return 1 end
+end
+
+function advtrains.interlocking.clear_visu_context(context)
+	if not markerent[context] then return end
+	for key, obj in pairs(markerent[context]) do
+		obj:remove()
+	end
+	markerent[context] = nil
+end
+
+-- visualize route. 'context' is a string that identifies the context of this visualization
+-- e.g. prog_<player> or vis_<pts> for later visualizations
+-- last 2 parameters are only to be used in the context of route programming!
+function advtrains.interlocking.visualize_route(origin, route, context, tmp_lcks, pname)
+	advtrains.interlocking.clear_visu_context(context)
+	
+	local oyaw = 0
+	local onode_ok, oconns, orhe = advtrains.get_rail_info_at(origin.p, advtrains.all_tracktypes)
+	if onode_ok then
+		oyaw = advtrains.dir_to_angle(oconns[origin.s].c)
+	end
+	routemarker(context, origin.p, "rte_origin", "at_il_route_start.png", oyaw, route.name)
+	
+	local c_sigd = origin
+	for k,v in ipairs(route) do
+		c_sigd = v.next
+		-- display route path
+		-- Final "next" marker can be EOI, thus undefined. This is legitimate.
+		if c_sigd then
+			local yaw = 0
+			local node_ok, conns, rhe = advtrains.get_rail_info_at(c_sigd.p, advtrains.all_tracktypes)
+			if node_ok then
+				yaw = advtrains.dir_to_angle(conns[c_sigd.s].c)
+			end
+			local img = "at_il_route_set.png"
+			if k==#route and not tmp_lcks then
+				img = "at_il_route_end.png"
+			end
+			routemarker(context, c_sigd.p, "rte"..k, img, yaw, route.name.." #"..k)
+		end
+		-- display locks
+		for pts, state in pairs(v.locks) do
+			local pos = minetest.string_to_pos(pts)
+			routesprite(context, pos, "fix"..k..pts, "at_il_route_lock.png", "Fixed in state '"..state.."' by route "..route.name.." until segment #"..k.." is freed.")
+		end
+	end
+	
+	-- The presence of tmp_lcks tells us that we are displaying during route programming.
+	if tmp_lcks then
+		-- display route end markers at appropriate places (check next TS, if it exists)
+		local terminal = c_sigd
+		if terminal then
+			local term_tcbs = advtrains.interlocking.db.get_tcbs(terminal)
+			if term_tcbs.ts_id then
+				local over_ts = advtrains.interlocking.db.get_ts(term_tcbs.ts_id)
+				for i, sigd in ipairs(over_ts.tc_breaks) do
+					if not vector.equals(sigd.p, terminal.p) then
+						local yaw = 0
+						local node_ok, conns, rhe = advtrains.get_rail_info_at(sigd.p, advtrains.all_tracktypes)
+						if node_ok then
+							yaw = advtrains.dir_to_angle(conns[otherside(sigd.s)].c)
+						end
+						routemarker(context, sigd.p, "rteterm"..i, "at_il_route_end.png", yaw, route.name.." Terminal "..i)
+					end
+				end
+			end
+		end
+	-- display locks set by player		
+		for pts, state in pairs(tmp_lcks) do
+			local pos = minetest.string_to_pos(pts)
+			routesprite(context, pos, "fixp"..pts, "at_il_route_lock_edit.png", "Fixed in state '"..state.."' by route "..route.name.." (punch to unfix)",
+				function() clear_lock(tmp_lcks, pname, pts) end)
+		end
+	end
+end
+
+
+local player_rte_prog = {}
+
+function advtrains.interlocking.init_route_prog(pname, sigd)
+	if not minetest.check_player_privs(pname, "interlocking") then
+		minetest.chat_send_player(pname, "Insufficient privileges to use this!")
+		return
+	end
+	player_rte_prog[pname] = {
+		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, "Route programming mode active. Punch TCBs to add route segments, punch turnouts to lock them.")
+end
+
+local function get_last_route_item(origin, route)
+	if #route == 0 then
+		return origin
+	end
+	return route[#route].next
+end
+
+local function do_advance_route(pname, rp, sigd, tsname)
+	table.insert(rp.route, {next = sigd, locks = rp.tmp_lcks})
+	rp.tmp_lcks = {}
+	chat(pname, "Added track section '"..tsname.."' to the route.")
+end
+
+local function finishrpform(pname)
+	local rp = player_rte_prog[pname]
+	if not rp then return end
+	
+	local form = "size[7,6]label[0.5,0.5;Finish programming route]"
+	local terminal = get_last_route_item(rp.origin, rp.route)
+	if terminal then
+		local term_tcbs = advtrains.interlocking.db.get_tcbs(terminal)
+		
+		if term_tcbs.signal then
+			form = form .. "label[0.5,1.5;Route ends at signal:]"
+			form = form .. "label[0.5,2  ;"..term_tcbs.signal_name.."]"
+		else
+			form = form .. "label[0.5,1.5;WARNING: Route does not end at a signal.]"
+			form = form .. "label[0.5,2  ;Routes should in most cases end at signals.]"
+			form = form .. "label[0.5,2.5;Cancel if you are unsure!]"
+		end
+	else
+		form = form .. "label[0.5,1.5;Route leads into]"
+		form = form .. "label[0.5,2  ;non-interlocked area]"
+	end
+	form = form.."field[0.8,3.5;5.2,1;name;Enter Route Name;]"
+	form = form.."button_exit[0.5,4.5;  5,1;save;Save Route]"
+	
+	
+	minetest.show_formspec(pname, "at_il_routepf", form)
+end
+
+
+local function check_advance_valid(tcbpos, rp)
+	-- track circuit break, try to advance route over it
+	local lri = get_last_route_item(rp.origin, rp.route)
+	if not lri then
+		return false, false
+	end
+	
+	local is_endpoint = false
+	
+	local this_sigd, this_ts, adv_side
+	
+	if vector.equals(lri.p, tcbpos) then
+		-- If the player just punched the last TCB again, it's of course possible to
+		-- finish the route here (although it can't be advanced by here.
+		-- Fun fact: you can now program routes that end exactly where they begin :)
+		is_endpoint = true
+		this_sigd = lri
+	else
+		-- else, we need to check whether this TS actually borders
+		local start_tcbs = advtrains.interlocking.db.get_tcbs(lri)
+		if not start_tcbs.ts_id then
+			return false, false
+		end
+		
+		this_ts = advtrains.interlocking.db.get_ts(start_tcbs.ts_id)
+		for _,sigd in ipairs(this_ts.tc_breaks) do
+			if vector.equals(sigd.p, tcbpos) then
+				adv_side = otherside(sigd.s)
+			end
+		end
+		if not adv_side then
+			-- this TCB is not bordering to the section
+			return false, false
+		end
+		this_sigd = {p=tcbpos, s=adv_side}
+	end
+	
+	-- check whether the ts at the other end is capable of "end over"
+	local adv_tcbs = advtrains.interlocking.db.get_tcbs(this_sigd)
+	local next_tsid = adv_tcbs.ts_id
+	local can_over, over_ts, next_tc_bs = false, nil, nil
+	local cannotover_rsn = "Next section is diverging (>2 TCBs)"
+	if next_tsid then
+		-- you may not advance over EOI. While this is technically possible,
+		-- in practise this just enters an unnecessary extra empty route item.
+		over_ts = advtrains.interlocking.db.get_ts(adv_tcbs.ts_id)
+		next_tc_bs = over_ts.tc_breaks
+		can_over = #next_tc_bs <= 2
+	else
+		cannotover_rsn = "End of interlocking"
+	end
+	
+	local over_sigd = nil
+	if can_over then
+		if next_tc_bs and #next_tc_bs == 2 then
+			local sdt
+			if vector.equals(next_tc_bs[1].p, tcbpos) then
+				sdt = next_tc_bs[2]
+			end
+			if vector.equals(next_tc_bs[2].p, tcbpos) then
+				sdt = next_tc_bs[1]
+			end
+			if not sdt then
+				error("Inconsistency: "..dump(next_ts))
+			end
+			-- swap TCB direction
+			over_sigd = {p = sdt.p, s = otherside(sdt.s) }
+		end
+	end
+	
+	return is_endpoint, true, this_sigd, this_ts, can_over, over_ts, over_sigd, cannotover_rsn
+end
+
+local function show_routing_form(pname, tcbpos, message)
+
+	local rp = player_rte_prog[pname]
+	
+	if not rp then return end
+	
+	local is_endpoint, advance_valid, this_sigd, this_ts, can_over, over_ts, over_sigd, cannotover_rsn = check_advance_valid(tcbpos, rp)
+	
+	-- at this place, advance_valid shows whether the current route can be advanced
+	-- over this TCB.
+	-- If it can: 
+	--  Advance over (continue programming)
+	--  End here
+	--  Advance and end (only <=2 TCBs, terminal signal needs to be known)
+	-- if not:
+	--  show nothing at all
+	-- In all cases, Discard and Backtrack buttons needed.
+	
+	local form = "size[7,9.5]label[0.5,0.5;Advance/Complete Route]"
+	if message then
+		form = form .. "label[0.5,1;"..message.."]"
+	end
+	
+	if advance_valid and not is_endpoint then
+		form = form.. "label[0.5,1.8;Advance to next route section]"
+		form = form.."image_button[0.5,2.2;  5,1;at_il_routep_advance.png;advance;]"
+		
+		form = form.. "label[0.5,3.5;-------------------------]"
+	else
+		form = form.. "label[0.5,2.3;This TCB is not suitable as]"
+		form = form.. "label[0.5,2.8;route continuation.]"
+	end
+	if advance_valid or is_endpoint then
+		form = form.. "label[0.5,3.8;Finish route HERE]"
+		form = form.."image_button[0.5,  4.2;  5,1;at_il_routep_end_here.png;endhere;]"
+		if can_over then
+			form = form.. "label[0.5,5.3;Finish route at end of NEXT section]"
+			form = form.."image_button[0.5,5.7;  5,1;at_il_routep_end_over.png;endover;]"
+		else
+			form = form.. "label[0.5,5.3;Advancing over next section is]"
+			form = form.. "label[0.5,5.8;impossible at this place.]"
+			if cannotover_rsn then
+				form = form.. "label[0.5,6.3;"..cannotover_rsn.."]"
+			end
+		end
+	end
+	
+	form = form.. "label[0.5,7;-------------------------]"
+	if #rp.route > 0 then
+		form = form.."button[0.5,7.4;  5,1;retract;Step back one section]"
+	end
+	form = form.."button[0.5,8.4;  5,1;cancel;Cancel route programming]"
+	
+	minetest.show_formspec(pname, "at_il_rprog_"..minetest.pos_to_string(tcbpos), form)
+end
+
+minetest.register_on_player_receive_fields(function(player, formname, fields)
+	local pname = player:get_player_name()
+	
+	local tcbpts = string.match(formname, "^at_il_rprog_([^_]+)$")
+	local tcbpos
+	if tcbpts then
+		tcbpos = minetest.string_to_pos(tcbpts)
+	end
+	if tcbpos then
+		-- RPROG form
+		local rp = player_rte_prog[pname]
+		if not rp then
+			minetest.close_formspec(pname, formname)
+			return
+		end
+		
+		local is_endpoint, advance_valid, this_sigd, this_ts, can_over, over_ts, over_sigd = check_advance_valid(tcbpos, rp)
+		
+		if advance_valid then
+			if fields.advance then
+				-- advance route
+				if not is_endpoint then
+					do_advance_route(pname, rp, this_sigd, this_ts.name)
+				end
+			end
+			if fields.endhere then
+				if not is_endpoint then
+					do_advance_route(pname, rp, this_sigd, this_ts.name)
+				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)
+				end
+				do_advance_route(pname, rp, over_sigd, over_ts and over_ts.name or "--EOI--")
+				finishrpform(pname)
+			end
+		end
+		if fields.retract then
+			if #rp.route <= 0 then
+				minetest.close_formspec(pname, formname)
+				return
+			end
+			rp.tmp_locks = rp.route[#rp.route].locks
+			rp.route[#rp.route] = nil
+			chat(pname, "Route section "..(#rp.route+1).." removed.") 
+		end
+		if fields.cancel then
+			player_rte_prog[pname] = nil
+			advtrains.interlocking.clear_visu_context("prog_"..pname)
+			chat(pname, "Route discarded.")
+			minetest.close_formspec(pname, formname)
+			return
+		end
+		
+		advtrains.interlocking.visualize_route(rp.origin, rp.route, "prog_"..pname, rp.tmp_lcks, pname)
+		minetest.close_formspec(pname, formname)
+		return
+	end
+	
+	if formname == "at_il_routepf" then
+		if not fields.save or not fields.name then return end
+		if fields.name == "" then
+			-- show form again
+			finishrpform(pname)
+			return
+		end
+		
+		local rp = player_rte_prog[pname]
+		if rp then
+			if #rp.route <= 0 then
+				chat(pname, "Cannot program route without a target")
+				return
+			end
+			
+			local tcbs = advtrains.interlocking.db.get_tcbs(rp.origin)
+			if not tcbs then
+				chat(pname, "The origin TCB has become unknown during programming. Try again.")
+				return
+			end
+			
+			local terminal = get_last_route_item(rp.origin, rp.route)
+			rp.route.terminal = terminal
+			rp.route.name = fields.name
+			
+			table.insert(tcbs.routes, rp.route)
+			
+			advtrains.interlocking.clear_visu_context("prog_"..pname)
+			player_rte_prog[pname] = nil
+			chat(pname, "Successfully programmed route.")
+			
+			advtrains.interlocking.show_route_edit_form(pname, rp.origin, #tcbs.routes)
+			return
+		end
+	end 
+end)
+
+
+-- Central route programming punch callback
+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
+	local rp = player_rte_prog[pname]
+	if rp then
+		-- determine what the punched node is
+		if minetest.get_item_group(node.name, "at_il_track_circuit_break") >= 1 then
+			-- get position of the assigned tcb
+			local meta = minetest.get_meta(pos)
+			local tcbpts = meta:get_string("tcb_pos")
+			if tcbpts == "" then 
+				chat(pname, "This TCB is unconfigured, you first need to assign it to a rail")
+				return
+			end
+			local tcbpos = minetest.string_to_pos(tcbpts)
+			
+			-- show formspec
+			
+			show_routing_form(pname, tcbpos)
+			
+			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)
+			if rp.tmp_lcks[pts] then
+				clear_lock(rp.tmp_lcks, pname, pts)
+			else
+				local state = advtrains.getstate(pos)
+				rp.tmp_lcks[pts] = state
+				chat(pname, pts.." is held in "..state.." position when this route is set and freed ")
+			end
+			advtrains.interlocking.visualize_route(rp.origin, rp.route, "prog_"..pname, rp.tmp_lcks, pname)
+			return
+		end
+		
+	end
+end)
+
+
+--TODO on route setting
+-- routes should end at signals. complete route setting by punching a signal, and command as exceptional route completion
+-- Create simpler way to advance a route to the next tcb/signal on simple sections without turnouts
diff --git a/advtrains/advtrains_interlocking/route_ui.lua b/advtrains/advtrains_interlocking/route_ui.lua
new file mode 100644
index 0000000..71fed09
--- /dev/null
+++ b/advtrains/advtrains_interlocking/route_ui.lua
@@ -0,0 +1,152 @@
+-- route_ui.lua
+-- User interface for showing and editing routes
+
+local atil = advtrains.interlocking
+local ildb = atil.db
+
+-- TODO duplicate
+local lntrans = { "A", "B" }
+local function sigd_to_string(sigd)
+	return minetest.pos_to_string(sigd.p).." / "..lntrans[sigd.s]
+end
+
+
+
+function atil.show_route_edit_form(pname, sigd, routeid)
+
+	if not minetest.check_player_privs(pname, {train_operator=true, interlocking=true}) then
+		minetest.chat_send_player(pname, "Insufficient privileges to use this!")
+		return
+	end
+	
+	local tcbs = atil.db.get_tcbs(sigd)
+	if not tcbs then return end
+	local route = tcbs.routes[routeid]
+	if not route then return end
+	
+	local form = "size[9,10]label[0.5,0.2;Route overview]"
+	form = form.."field[0.8,1.2;5.2,1;name;Route name;"..minetest.formspec_escape(route.name).."]"
+	form = form.."button[5.5,0.9;1,1;setname;Set]"
+	
+	-- construct textlist for route information
+	local tab = {}
+	local function itab(t)
+		tab[#tab+1] = minetest.formspec_escape(string.gsub(t, ",", " "))
+	end
+	itab("TCB "..sigd_to_string(sigd).." ("..tcbs.signal_name..") Route #"..routeid)
+	
+	-- 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
+	while c_sigd and i<=#route do
+		c_tcbs = ildb.get_tcbs(c_sigd)
+		if not c_tcbs then
+			itab("-!- No TCBS at "..sigd_to_string(c_sigd)..". Please reconfigure route!")
+			break
+		end
+		c_ts_id = c_tcbs.ts_id
+		if not c_ts_id then
+			itab("-!- No track section adjacent to "..sigd_to_string(c_sigd)..". Please reconfigure route!")
+			break
+		end
+		c_ts = ildb.get_ts(c_ts_id)
+		
+		c_rseg = route[i]
+		c_lckp = {}
+		
+		itab(""..i.." Entry "..sigd_to_string(c_sigd).." -> Sec. "..(c_ts and c_ts.name or "-").." -> Exit "..(c_rseg.next and sigd_to_string(c_rseg.next) or "END"))
+		
+		if c_rseg.locks then
+			for pts, state in pairs(c_rseg.locks) do
+				
+				local pos = minetest.string_to_pos(pts)
+				itab("  Lock: "..pts.." -> "..state)
+				if not advtrains.is_passive(pos) then
+					itab("-!- No passive component at "..pts..". Please reconfigure route!")
+					break
+				end
+			end
+		end
+		-- advance
+		c_sigd = c_rseg.next
+		i = i + 1
+	end
+	if c_sigd then
+		local e_tcbs = ildb.get_tcbs(c_sigd)
+		itab("Route end: "..sigd_to_string(c_sigd).." ("..(e_tcbs and e_tcbs.signal_name or "-")..")")
+	else
+		itab("Route ends on dead-end")
+	end
+	
+	form = form.."textlist[0.5,2;7,4;rtelog;"..table.concat(tab, ",").."]"
+	
+	form = form.."button[0.5,6;2,1;back;<<< Back to signal]"
+	form = form.."button[3.5,6;2,1;aspect;Signal Aspect]"
+	form = form.."button[5.5,6;2,1;delete;Delete Route]"
+	
+	--atdebug(route.ars)
+	form = form.."textarea[1,7.3;5.2,3;ars;ARS Rule List;"..atil.ars_to_text(route.ars).."]"
+	form = form.."button[6,7.7;1,1;savears;Save]"
+	
+	minetest.show_formspec(pname, "at_il_routeedit_"..minetest.pos_to_string(sigd.p).."_"..sigd.s.."_"..routeid, 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, {train_operator=true, interlocking=true}) then
+		return
+	end
+	
+	local pts, connids, routeids = string.match(formname, "^at_il_routeedit_([^_]+)_(%d)_(%d+)$")
+	local pos, connid, routeid
+	if pts then
+		pos = minetest.string_to_pos(pts)
+		connid = tonumber(connids)
+		routeid = tonumber(routeids)
+		if not connid or connid<1 or connid>2 then return end
+		if not routeid then return end
+	end
+	if pos and connid and routeid and not fields.quit then
+		local sigd = {p=pos, s=connid}
+		local tcbs = ildb.get_tcbs(sigd)
+		if not tcbs then return end
+		local route = tcbs.routes[routeid]
+		if not route then 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)
+			end
+			
+			advtrains.interlocking.show_signal_aspect_selector(pname, suppasp, route.name, callback, route.aspect)
+			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)
+		end
+		
+		if fields.ars and fields.savears then
+			route.ars = atil.text_to_ars(fields.ars)
+			--atdebug(route.ars)
+		end
+		
+		if fields.back then
+			advtrains.interlocking.show_signalling_form(sigd, pname)
+		end
+		
+	end
+end)
diff --git a/advtrains/advtrains_interlocking/routesetting.lua b/advtrains/advtrains_interlocking/routesetting.lua
new file mode 100644
index 0000000..575b053
--- /dev/null
+++ b/advtrains/advtrains_interlocking/routesetting.lua
@@ -0,0 +1,357 @@
+-- Setting and clearing routes
+
+-- TODO duplicate
+local lntrans = { "A", "B" }
+local function sigd_to_string(sigd)
+	return minetest.pos_to_string(sigd.p).." / "..lntrans[sigd.s]
+end
+
+local asp_generic_free = {
+	main = {
+		free = true,
+		speed = -1,
+	},
+	shunt = {
+		free = false,
+	},
+	dst = {
+		free = true,
+		speed = -1,
+	},
+	info = {}
+}
+
+local ildb = advtrains.interlocking.db
+local ilrs = {}
+
+local sigd_equal = advtrains.interlocking.sigd_equal
+
+-- table containing locked points
+-- also manual locks (maintenance a.s.o.) are recorded here
+-- [pts] = { 
+--		[n] = { [by = <ts_id>], rsn = <human-readable text>, [origin = <sigd>] }
+--	}
+ilrs.rte_locks = {}
+ilrs.rte_callbacks = {
+	ts = {},
+	lck = {}
+}
+
+
+-- main route setting. First checks if everything can be set as designated,
+-- then (if "try" is not set) actually sets it
+-- returns:
+-- true - route can be/was successfully set
+-- false, message, cbts, cblk - something went wrong, what is contained in the message.
+-- cbts: the ts id of the conflicting ts, cblk: the pts of the conflicting component
+function ilrs.set_route(signal, route, try)
+	if not try then
+		local tsuc, trsn, cbts, cblk = ilrs.set_route(signal, route, true)
+		if not tsuc then
+			return false, trsn, cbts, cblk
+		end
+	end
+
+	
+	-- we start at the tc designated by signal
+	local c_sigd = signal
+	local first = true
+	local i = 1
+	local rtename = route.name
+	local signalname = ildb.get_tcbs(signal).signal_name
+	local c_tcbs, c_ts_id, c_ts, c_rseg, c_lckp
+	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!"
+		end
+		c_ts_id = c_tcbs.ts_id
+		if not c_ts_id then
+			if not try then atwarn("Encountered End-Of-Interlocking while setting route",rtename,"of",signal) end
+			return false, "No track section adjacent to "..sigd_to_string(c_sigd)..". Please reconfigure route!"
+		end
+		c_ts = ildb.get_ts(c_ts_id)
+		c_rseg = route[i]
+		c_lckp = {}
+		
+		if 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
+		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
+		end
+		
+		for pts, state in pairs(c_rseg.locks) do
+			local confl = ilrs.has_route_lock(pts, state)
+			
+			local pos = minetest.string_to_pos(pts)
+			if advtrains.is_passive(pos) then
+				local cstate = advtrains.getstate(pos)
+				if cstate ~= state then
+					local confl = ilrs.has_route_lock(pts)
+					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
+					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
+				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!"
+			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
+			end
+			c_ts.route = {
+				origin = signal,
+				entry = c_sigd,
+				rsn = "Route '"..rtename.."' from signal '"..signalname.."', segment #"..i,
+				first = first,
+			}
+			c_ts.route_post = {
+				locks = c_lckp,
+				next = nvar,
+			}
+			if c_tcbs.signal then
+				c_tcbs.route_committed = true
+				c_tcbs.aspect = route.aspect or asp_generic_free
+				c_tcbs.route_origin = signal
+				advtrains.interlocking.update_signal_aspect(c_tcbs)
+			end
+		end
+		-- advance
+		first = nil
+		c_sigd = c_rseg.next
+		i = i + 1
+	end
+	
+	return true
+end
+
+-- 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)
+	-- look this up
+	local e = ilrs.rte_locks[pts]
+	if not e then return nil
+	elseif #e==0 then
+		ilrs.rte_locks[pts] = nil
+		return nil
+	end
+	local txts = {}
+	for _, ent in ipairs(e) do
+		txts[#txts+1] = ent.rsn
+	end
+	return table.concat(txts, "\n")
+end
+
+-- adds route lock for position
+function ilrs.add_route_lock(pts, ts, rsn, origin)
+	ilrs.free_route_locks_indiv(pts, ts, true)
+	local elm = {by=ts, rsn=rsn, origin=origin}
+	if not ilrs.rte_locks[pts] then
+		ilrs.rte_locks[pts] = { elm }
+	else
+		table.insert(ilrs.rte_locks[pts], elm)
+	end
+end
+
+-- adds route lock for position
+function ilrs.add_manual_route_lock(pts, rsn)
+	local elm = {rsn=rsn}
+	if not ilrs.rte_locks[pts] then
+		ilrs.rte_locks[pts] = { elm }
+	else
+		table.insert(ilrs.rte_locks[pts], elm)
+	end
+end
+
+-- frees route locking for all points (components) that were set by this ts
+function ilrs.free_route_locks(ts, lcks, nocallbacks)
+	for _,pts in pairs(lcks) do
+		ilrs.free_route_locks_indiv(pts, ts, nocallbacks)
+	end
+end
+
+function ilrs.free_route_locks_indiv(pts, ts, nocallbacks)
+	local e = ilrs.rte_locks[pts]
+	if not e then return nil
+	elseif #e==0 then
+		ilrs.rte_locks[pts] = nil
+		return nil
+	end
+	local i = 1
+	while i <= #e do
+		if e[i].by == ts then
+			--atdebug("free_route_locks_indiv",pts,"clearing entry",e[i].by,e[i].rsn)
+			table.remove(e,i)
+		else
+			i = i + 1
+		end
+	end
+	-- This must be delayed, because this code is executed in-between a train step
+	-- 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))
+	end
+end
+-- frees all route locks, even manual ones set with the tool, at a specific position
+function ilrs.remove_route_locks(pts, nocallbacks)
+	ilrs.rte_locks[pts] = nil
+	-- This must be delayed, because this code is executed in-between a train step
+	-- TODO use luaautomation timers?
+	if not nocallbacks then
+		minetest.after(0, ilrs.update_waiting, "lck", pts)
+	end
+end
+
+
+-- starting from the designated sigd, clears all subsequent route and route_post
+-- information from the track sections.
+-- note that this does not clear the routesetting status from the entry signal,
+-- only from the ts's
+function ilrs.cancel_route_from(sigd)
+	-- we start at the tc designated by signal
+	local c_sigd = sigd
+	local c_tcbs, c_ts_id, c_ts, c_rseg, c_lckp
+	while c_sigd do
+		--atdebug("cancel_route_from: at sigd",c_sigd)
+		c_tcbs = ildb.get_tcbs(c_sigd)
+		if not c_tcbs then
+			atwarn("Failed to cancel route, no TCBS at",c_sigd)
+			return false
+		end
+		
+		--atdebug("cancelling",c_ts.route.rsn)
+		-- clear signal aspect and routesetting state
+		c_tcbs.route_committed = nil
+		c_tcbs.aspect = nil
+		c_tcbs.routeset = nil
+		c_tcbs.route_auto = nil
+		c_tcbs.route_origin = nil
+		
+		advtrains.interlocking.update_signal_aspect(c_tcbs)
+		
+		c_ts_id = c_tcbs.ts_id
+		if not c_tcbs then
+			atwarn("Failed to cancel route, end of interlocking at",c_sigd)
+			return false
+		end
+		c_ts = ildb.get_ts(c_ts_id)
+		
+		if not c_ts
+			or not c_ts.route
+			or not sigd_equal(c_ts.route.entry, c_sigd) then
+			--atdebug("cancel_route_from: abort (eoi/no route):")
+			return false
+		end
+		
+		c_ts.route = nil
+		
+		if c_ts.route_post then
+			advtrains.interlocking.route.free_route_locks(c_ts_id, c_ts.route_post.locks)
+			c_sigd = c_ts.route_post.next
+		else
+			c_sigd = nil
+		end
+		c_ts.route_post = nil
+		minetest.after(0, advtrains.interlocking.route.update_waiting, "ts", c_ts_id)
+	end
+	--atdebug("cancel_route_from: done (no final sigd)")
+	return true
+end
+
+-- TCBS Routesetting helper: generic update function for
+-- route setting
+-- Call this function to set and cancel routes!
+-- sigd, tcbs: self-explanatory
+-- newrte: If a new route should be set, the route index of it (in tcbs.routes). nil otherwise
+-- cancel: true in combination with newrte=nil causes cancellation of the current route.
+function ilrs.update_route(sigd, tcbs, newrte, cancel)
+	--atdebug("Update_Route for",sigd,tcbs.signal_name)
+	local has_changed_aspect = false
+	if tcbs.route_origin and not sigd_equal(tcbs.route_origin, sigd) then
+		--atdebug("Signal not in control, held by",tcbs.signal_name)
+		return
+	end
+	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
+		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
+			return
+		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])
+		if not succ then
+			tcbs.route_rsn = rsn
+			--atdebug("Routesetting failed:",rsn)
+			-- add cbts or cblk to callback table
+			if cbts then
+				--atdebug("cbts =",cbts)
+				if not ilrs.rte_callbacks.ts[cbts] then ilrs.rte_callbacks.ts[cbts]={} end
+				advtrains.insert_once(ilrs.rte_callbacks.ts[cbts], sigd, sigd_equal)
+			end
+			if cblk then
+				--atdebug("cblk =",cblk)
+				if not ilrs.rte_callbacks.lck[cblk] then ilrs.rte_callbacks.lck[cblk]={} end
+				advtrains.insert_once(ilrs.rte_callbacks.lck[cblk], sigd, sigd_equal)
+			end
+		else
+			--atdebug("Committed Route:",tcbs.routeset)
+			has_changed_aspect = true
+		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)
+	end
+	advtrains.interlocking.update_player_forms(sigd)
+end
+
+-- Try to re-set routes that conflicted with this point
+-- sys can be one of "ts" and "lck"
+-- key is then ts_id or pts respectively
+function ilrs.update_waiting(sys, key)
+	--atdebug("update_waiting:",sys,".",key)
+	local t = ilrs.rte_callbacks[sys][key]
+	ilrs.rte_callbacks[sys][key] = nil
+	if t then
+		for _,sigd in ipairs(t) do
+			--atdebug("Updating", sigd)
+			-- While these are run, the table we cleared before may be populated again, which is in our interest.
+			-- (that's the reason we needed to copy it)
+			local tcbs = ildb.get_tcbs(sigd)
+			if tcbs then
+				ilrs.update_route(sigd, tcbs)
+			end
+		end
+	end
+end
+
+advtrains.interlocking.route = ilrs
+
diff --git a/advtrains/advtrains_interlocking/settingtypes.txt b/advtrains/advtrains_interlocking/settingtypes.txt
new file mode 100644
index 0000000..f1c22b0
--- /dev/null
+++ b/advtrains/advtrains_interlocking/settingtypes.txt
@@ -0,0 +1,4 @@
+#    Stop trains forcibly in front of signal when about to run over an LZB 0 restriction, instead of setting emergency halt for manual resolving
+#    This prevents the need to manually restart trains that overran red signals, but is unrealistic.
+#    This is a workaround to circumvent system breakages due to bugs in LZB braking curves
+at_il_force_lzb_halt (Force LZB Halt) bool true
diff --git a/advtrains/advtrains_interlocking/signal_api.lua b/advtrains/advtrains_interlocking/signal_api.lua
new file mode 100644
index 0000000..9729195
--- /dev/null
+++ b/advtrains/advtrains_interlocking/signal_api.lua
@@ -0,0 +1,546 @@
+-- Signal API implementation
+
+
+--[[
+Signal aspect table:
+asp = {
+	main = {
+		free = <boolean>,
+		speed = <int km/h>,
+	},
+	shunt = {
+		free = <boolean>,
+		-- Whether train may proceed as shunt move, on sight
+		-- main aspect takes precedence over this
+		proceed_as_main = <boolean>,
+		-- If an approaching train is a shunt move and "main.free" is set,
+		-- the train may proceed as a train move under the "main" aspect
+		-- If this is not set, shunt moves are NOT allowed to switch to
+		-- a train move, and must stop even if "main.free" is set.
+		-- This is intended to be used for "Halt for shunt moves" signs.
+	}
+	dst = {
+		free = <boolean>,
+		speed = <int km/h>,
+	}
+	info = {
+		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)
+	}
+}
+-- For "speed" and "w_speed" fields, a value of -1 means that the
+-- restriction is lifted. If they are omitted, the value imposed at
+-- the last aspect received remains valid.
+-- The "dst" subtable can be completely omitted when no explicit dst
+-- aspect should be signalled to the train. In this case, the last
+-- signalled dst aspect remains valid.
+
+== 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
+
+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,
+}
+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.
+		-- Example: 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.
+		-- 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, this signal should never
+		--  set the corresponding "speed" field in the aspect, which means
+		--  that the previous speed limit stays valid
+		-- 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 = {
+			free = <boolean/nil>,
+			speed = {<speed1>, ..., <speedn>} or nil,
+		},
+		dst = {
+			free = <boolean/nil>,
+			speed = {<speed1>, ..., <speedn>} or nil,
+		},
+		shunt = {
+			free = <boolean/nil>,
+		},
+		info = {
+			call_on = <boolean/nil>,
+			dead_end = <boolean/nil>,
+			w_speed = {<speed1>, ..., <speedn>} or nil,
+		}
+		
+	},
+	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.free=true 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 = {
+			free = true,
+		}
+		dst = {
+			free = true,
+		}
+		shunt = {
+			free = false,
+			proceed_as_main = false,
+		}
+	end,
+}
+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 = {
+	main = {
+		free = false,
+		speed = 0,
+	},
+	shunt = {
+		free = false,
+	},
+	dst = {
+		free = false,
+		speed = 0,
+	},
+	info = {}
+}
+advtrains.interlocking.DANGER = DANGER
+
+local function fillout_aspect(asp)
+	if not asp.main then
+		asp.main = {
+			free = true,
+		}
+	elseif type(asp.main) ~= "table" then
+		asp.main = {
+			free = asp.main~=0,
+			speed = asp.main,
+		}
+	end
+	if not asp.dst then
+		asp.dst = {
+			free = true,
+		}
+	end 
+	if not asp.shunt then
+		asp.shunt = {
+			free = false,
+			proceed_as_main = false,
+		}
+	elseif type(asp.shunt) ~= "table" then
+		asp.shunt = {
+			free = asp.shunt,
+			proceed_as_main = asp.proceed_as_main,
+		}
+	end
+	if not asp.info then
+		asp.info = {}
+	end
+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
+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)
+end
+
+function advtrains.interlocking.signal_set_aspect(pos, asp)
+	fillout_aspect(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)
+	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)
+	
+	local tns = advtrains.occ.get_trains_over(ipos)
+	for id, sidx in pairs(tns) do
+--		local train = advtrains.trains[id]
+		--if train.index <= sidx then
+		minetest.after(0, advtrains.invalidate_path, id)
+		--end
+	end
+end
+
+function advtrains.interlocking.signal_rc_handler(pos, node, player, itemstack, pointed_thing)
+	local pname = player:get_player_name()
+	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
+			minetest.show_formspec(pname, "at_il_sigasp_"..minetest.pos_to_string(pos), "field[aspect;Set Aspect ('A' to assign IP);D0D0D]")
+		else
+			--static signal - only IP
+			advtrains.interlocking.show_ip_form(pos, pname)
+		end
+	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_sigasp_(.+)$")
+	local pos
+	if pts then pos = minetest.string_to_pos(pts) end
+	if pos and fields.aspect then
+		if fields.aspect == "A" then
+			advtrains.interlocking.show_ip_form(pos, pname)
+			return
+		end
+		local mfs, msps, dfs, dsps, shs = string.match(fields.aspect, "^([FD])([-0-9]+)([FD])([-0-9]+)([FD])$")
+		local asp = {
+			main = {
+				free = mfs=="F",
+				speed = tonumber(msps),
+			},
+			shunt = {
+				free = shs=="F",
+			},
+			dst = {
+				free = dfs=="F",
+				speed = tonumber(dsps),
+			},
+			info = {
+				call_on = false, -- Call-on route, expect train in track ahead
+				dead_end = false, -- Route ends on a dead end (e.g. bumper)
+			}
+		}
+		advtrains.interlocking.signal_set_aspect(pos, asp)
+	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 tcbs.aspect
+		end
+	end
+	return DANGER;
+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
+		fillout_aspect(asp)
+		return asp
+	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
+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)
+	
+	-- 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
+
+-- 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;Signal at "..minetest.pos_to_string(pos).."]"
+	local pts, connid = advtrains.interlocking.db.get_ip_by_signalpos(pos)
+	if pts then
+		form = form.."label[0.5,1.5;Influence point is set at "..pts.."/"..connid.."]"
+		form = form.."button_exit[0.5,2.5;  5,1;set;Move]"
+		form = form.."button_exit[0.5,3.5;  5,1;clear;Clear]"
+		local ipos = minetest.string_to_pos(pts)
+		ipmarker(ipos, connid)
+	else
+		form = form.."label[0.5,1.5;Influence point is not set.]"
+		form = form.."label[0.5,2.0;It is recommended to set an influence point.]"
+		form = form.."label[0.5,2.5;This is the point where trains will obey the signal.]"
+		
+		form = form.."button_exit[0.5,3.5;  5,1;set;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)
+		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, "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
+
+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")
+				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
+end)
+
+
+--== aspect selector ==--
+
+local players_aspsel = {}
+
+--[[
+suppasp: "supported_aspects" table
+purpose: form title string
+callback: func(pname, aspect) called on form submit
+]]
+function advtrains.interlocking.show_signal_aspect_selector(pname, p_suppasp, p_purpose, callback, p_isasp)
+	local suppasp = p_suppasp or {
+		main = {}, dst = {}, shunt = {}, info = {},
+	}
+	local purpose = p_purpose or ""
+	local isasp = p_isasp and fillout_aspect(p_isasp)
+	
+	local form = "size[7,5]label[0.5,0.5;Select Signal Aspect:]"
+	form = form.."label[0.5,1;"..purpose.."]"
+	
+	form = form.."label[0.5,1.5;== Main Signal ==]"
+	if suppasp.main.free == nil then
+		local st = 2
+		if isasp and not isasp.main.free then st=1 end
+		form = form.."dropdown[0.5,2;2;main_free;danger,free;"..st.."]"
+	end
+	if suppasp.main.speed then
+		local selid = 1
+		if isasp and isasp.main.speed then
+			for idx, spv in ipairs(suppasp.main.speed) do
+				if spv == isasp.main.speed then
+					selid = idx
+					break
+				end
+			end
+		end
+		form = form.."label[2.3,1;Speed:]"
+		form = form.."dropdown[3,2;2;main_speed;"..table.concat(suppasp.main.speed, ",")..";"..selid.."]"
+	end
+	
+	form = form.."label[0.5,3;== Shunting ==]"
+	if suppasp.shunt.free == nil then
+		local st = 1
+		if isasp and isasp.shunt.free then st=2 end
+		form = form.."dropdown[0.5,3.5;2;shunt_free;---,allowed;"..st.."]"
+	end
+		
+	form = form.."button_exit[0.5,4.5;  5,1;save;OK]"
+	
+	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)
+end
+
+local function usebool(sup, val, free)
+	if sup == nil then
+		return val==free
+	else
+		return sup
+	end
+end
+local function usespeed(sup, val)
+	if sup then
+		return tonumber(val)
+	else
+		return nil
+	end
+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 asp = {
+					main = {
+						free = usebool(psl.suppasp.main.free, fields.main_free, "free"),
+						speed = usespeed(psl.suppasp.main.speed, fields.main_speed),
+					},
+					dst = {
+						free = true, speed = -1,
+					},
+					shunt = {
+						free = usebool(psl.suppasp.shunt.free, fields.shunt_free, "allowed"),
+					},
+					info = {}
+				}
+				psl.callback(pname, asp)
+			end
+		else
+			players_aspsel[pname] = nil
+		end
+	end
+	
+end)
diff --git a/advtrains/advtrains_interlocking/tcb_ts_ui.lua b/advtrains/advtrains_interlocking/tcb_ts_ui.lua
new file mode 100644
index 0000000..da318a7
--- /dev/null
+++ b/advtrains/advtrains_interlocking/tcb_ts_ui.lua
@@ -0,0 +1,789 @@
+-- Track Circuit Breaks and Track Sections - Player interaction
+
+local players_assign_tcb = {}
+local players_assign_signal = {}
+local players_link_ts = {}
+
+local ildb = advtrains.interlocking.db
+local ilrs = advtrains.interlocking.route
+
+local sigd_equal = advtrains.interlocking.sigd_equal
+
+local lntrans = { "A", "B" }
+
+local function sigd_to_string(sigd)
+	return minetest.pos_to_string(sigd.p).." / "..lntrans[sigd.s]
+end
+
+minetest.register_node("advtrains_interlocking:tcb_node", {
+	drawtype = "mesh",
+	paramtype="light",
+	paramtype2="facedir",
+	walkable = false,
+	selection_box = {
+		type = "fixed",
+		fixed = {-1/6, -1/2, -1/6, 1/6, 1/4, 1/6},
+	},
+	mesh = "at_il_tcb_node.obj",
+	tiles = {"at_il_tcb_node.png"},
+	description="Track Circuit Break",
+	sunlight_propagates=true,
+	groups = {
+		cracky=3,
+		not_blocking_trains=1,
+		--save_in_at_nodedb=2,
+		at_il_track_circuit_break = 1,
+	},
+	after_place_node = function(pos, node, player)
+		local meta = minetest.get_meta(pos)
+		meta:set_string("infotext", "Unconfigured Track Circuit Break, right-click to assign.")
+	end,
+	on_rightclick = function(pos, node, player)
+		local pname = player:get_player_name()
+		if not minetest.check_player_privs(pname, "interlocking") then
+			minetest.chat_send_player(pname, "Insufficient privileges to use this!")
+			return
+		end
+		
+		local meta = minetest.get_meta(pos)
+		local tcbpts = meta:get_string("tcb_pos")
+		if tcbpts ~= "" then
+			local tcbpos = minetest.string_to_pos(tcbpts)
+			local tcb = ildb.get_tcb(tcbpos)
+			if tcb then
+				advtrains.interlocking.show_tcb_form(tcbpos, pname)
+			else
+				minetest.chat_send_player(pname, "This TCB has been removed. Please dig marker.")
+			end
+		else
+			--unconfigured
+			minetest.chat_send_player(pname, "Configuring TCB: Please punch the rail you want to assign this TCB to.")
+			
+			players_assign_tcb[pname] = pos
+		end	
+	end,
+	--on_punch = function(pos, node, player)
+	--	local meta = minetest.get_meta(pos)
+	--	local tcbpts = meta:get_string("tcb_pos")
+	--	if tcbpts ~= "" then
+	--		local tcbpos = minetest.string_to_pos(tcbpts)
+	--		advtrains.interlocking.show_tcb_marker(tcbpos)
+	--	end	
+	--end,
+	can_dig = function(pos, player)
+		if player == nil then return false end
+
+		local pname = player:get_player_name()
+
+		-- Those markers can only be dug when all adjacent TS's are set
+		-- as EOI.
+		local meta = minetest.get_meta(pos)
+		local tcbpts = meta:get_string("tcb_pos")
+		if tcbpts ~= "" then
+			if not minetest.check_player_privs(pname, "interlocking") then
+				minetest.chat_send_player(pname, "Insufficient privileges to use this!")
+				return
+			end			
+			local tcbpos = minetest.string_to_pos(tcbpts)
+			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, "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, "Can't remove TCB: Side "..connid.." forbids modification (shouldn't happen).")
+					return false
+				end
+			end
+		end	
+		return true
+	end,
+	after_dig_node = function(pos, oldnode, oldmetadata, player)
+		if not oldmetadata or not oldmetadata.fields then return end
+		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(), "TCB has been removed.")
+			else
+				minetest.chat_send_player(player:get_player_name(), "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
+		end
+	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
+	-- TCB assignment
+	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)
+			if node_ok and #conns == 2 then
+				local ok = ildb.create_tcb(pos)
+				
+				if not ok then
+					minetest.chat_send_player(pname, "Configuring TCB: TCB already exists at this position! It has now been re-assigned.")
+				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", "TCB assigned to "..minetest.pos_to_string(pos))
+				minetest.chat_send_player(pname, "Configuring TCB: Successfully configured TCB")
+			else
+				minetest.chat_send_player(pname, "Configuring TCB: This is not a normal two-connection rail! Aborted.")
+			end
+		else
+			minetest.chat_send_player(pname, "Configuring TCB: Node is too far away. Aborted.")
+		end
+		players_assign_tcb[pname] = nil
+	end
+	
+	-- Signal assignment
+	local sigd = players_assign_signal[pname]
+	if sigd then
+		if vector.distance(pos, sigd.p)<=50 then
+			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
+					local tcbs = ildb.get_tcbs(sigd)
+					if tcbs then
+						tcbs.signal = pos
+						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
+						ildb.set_sigd_for_signal(pos, sigd)
+						minetest.chat_send_player(pname, "Configuring TCB: Successfully assigned signal.")
+						advtrains.interlocking.show_ip_form(pos, pname, true)
+					else
+						minetest.chat_send_player(pname, "Configuring TCB: Internal error, TCBS doesn't exist. Aborted.")
+					end
+				else
+					minetest.chat_send_player(pname, "Configuring TCB: Cannot use static signals for routesetting. Aborted.")
+				end
+			else
+				minetest.chat_send_player(pname, "Configuring TCB: Not a compatible signal. Aborted.")
+			end
+		else
+			minetest.chat_send_player(pname, "Configuring TCB: Node is too far away. Aborted.")
+		end
+		players_assign_signal[pname] = nil
+	end
+end)
+
+-- TCB Form
+
+local function mktcbformspec(tcbs, btnpref, offset, pname)
+	local form = ""
+	local ts
+	if tcbs.ts_id then
+		ts = ildb.get_ts(tcbs.ts_id)
+	end
+	if ts then
+		form = form.."label[0.5,"..offset..";Side "..btnpref..": "..minetest.formspec_escape(ts.name).."]"
+		form = form.."button[0.5,"..(offset+0.5)..";5,1;"..btnpref.."_gotots;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;Update near TCBs]"
+			form = form.."button[3  ,"..(offset+1.5)..";2.5,1;"..btnpref.."_remove;Remove from section]"
+		end
+	else
+		tcbs.ts_id = nil
+		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]"
+		--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
+	end
+	if tcbs.signal then
+		form = form.."button[0.5,"..(offset+2.5)..";5,1;"..btnpref.."_sigdia;Signalling]"	
+	else
+		form = form.."button[0.5,"..(offset+2.5)..";5,1;"..btnpref.."_asnsig;Assign a signal]"
+	end
+	return form
+end
+
+
+function advtrains.interlocking.show_tcb_form(pos, pname)
+	if not minetest.check_player_privs(pname, "interlocking") then
+		minetest.chat_send_player(pname, "Insufficient privileges to use this!")
+		return
+	end
+	local tcb = ildb.get_tcb(pos)
+	if not tcb then return end
+	
+	local form = "size[6,9] label[0.5,0.5;Track Circuit Break Configuration]"
+	form = form .. mktcbformspec(tcb[1], "A", 1, pname)
+	form = form .. mktcbformspec(tcb[2], "B", 5, pname)
+	
+	minetest.show_formspec(pname, "at_il_tcbconfig_"..minetest.pos_to_string(pos), form)
+	advtrains.interlocking.show_tcb_marker(pos)
+end
+
+--helper: length of nil table is 0
+local function nlen(t)
+	if not t then return 0 end
+	return #t
+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
+	local pts = string.match(formname, "^at_il_tcbconfig_(.+)$")
+	local pos
+	if pts then
+		pos = minetest.string_to_pos(pts)
+	end
+	if pos and not fields.quit then
+		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}
+		
+		for connid=1,2 do
+			local tcbs = tcb[connid]
+			if tcbs.ts_id then
+				if f_gotots[connid] then
+					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)
+					end
+				end
+				-- non-interlocked
+				if f_setfree[connid] then
+					tcbs.section_free = true
+				end
+				if f_setlocked[connid] then
+					tcbs.section_free = nil
+				end
+			end
+			if f_asnsig[connid] and not tcbs.signal then
+				minetest.chat_send_player(pname, "Configuring TCB: Please punch the signal to assign.")
+				players_assign_signal[pname] = {p=pos, s=connid}
+				minetest.close_formspec(pname, formname)
+				return
+			end
+			if f_sigdia[connid] and tcbs.signal then
+				advtrains.interlocking.show_signalling_form({p=pos, s=connid}, pname)
+				return
+			end
+
+		end
+		advtrains.interlocking.show_tcb_form(pos, pname)
+	end
+
+end)
+
+
+
+-- TS Formspec
+
+-- textlist selection temporary storage
+local ts_pselidx = {}
+
+function advtrains.interlocking.show_ts_form(ts_id, pname, sel_tcb)
+	if not minetest.check_player_privs(pname, "interlocking") then
+		minetest.chat_send_player(pname, "Insufficient privileges to use this!")
+		return
+	end
+	local ts = ildb.get_ts(ts_id)
+	if not ts_id then return end
+	
+	local form = "size[10,10]label[0.5,0.5;Track Section Detail - "..ts_id.."]"
+	form = form.."field[0.8,2;5.2,1;name;Section name;"..minetest.formspec_escape(ts.name).."]"
+	form = form.."button[5.5,1.7;1,1;setname;Set]"
+	local hint
+	
+	local strtab = {}
+	for idx, sigd in ipairs(ts.tc_breaks) do
+		strtab[#strtab+1] = minetest.formspec_escape(sigd_to_string(sigd))
+		advtrains.interlocking.show_tcb_marker(sigd.p)
+	end
+	
+	form = form.."textlist[0.5,3;5,3;tcblist;"..table.concat(strtab, ",").."]"
+	
+	if ildb.may_modify_ts(ts) then
+		
+		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;Join with "..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;Join into other section]"
+			hint = 1
+		end
+		form = form.."button[5.5,4;4,1;dissolve;Dissolve Section]"
+		form = form.."tooltip[dissolve;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;Unlink selected TCB]"
+			hint = 2
+		end
+	else
+		hint=3
+	end
+	
+	if ts.route then
+		form = form.."label[0.5,6.1;Route is set: "..ts.route.rsn.."]"
+	elseif ts.route_post then
+		form = form.."label[0.5,6.1;Section holds "..#(ts.route_post.lcks or {}).." route locks.]"
+	end
+	-- occupying trains
+	if ts.trains and #ts.trains>0 then
+		form = form.."label[0.5,7.1;Trains on this section:]"
+		form = form.."textlist[0.5,7.7;3,2;trnlist;"..table.concat(ts.trains, ",").."]"
+	else
+		form = form.."label[0.5,7.1;No trains on this section.]"
+	end
+	
+	form = form.."button[5.5,7;4,1;reset;Reset section state]"
+	
+	if hint == 1 then
+		form = form.."label[0.5,0.75;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;Unlinking a TCB will set it to non-interlocked mode.]"
+	elseif 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
+
+
+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
+	-- 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, "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)
+				minetest.close_formspec(pname, formname)
+				return
+			end
+		end
+		
+		if fields.setname then
+			ts.name = fields.name
+			if ts.name == "" then
+				ts.name = "Section "..ts_id
+			end
+		end
+		
+		if fields.reset then
+			-- User requested resetting the section
+			-- Show him what this means...
+			local form = "size[7,5]label[0.5,0.5;Reset track section]"
+			form = form.."label[0.5,1;This will clear the list of trains\nand the routesetting status of this section.\nAre you sure?]"
+			form = form.."button_exit[0.5,2.5;  5,1;reset;Yes]"
+			form = form.."button_exit[0.5,3.5;  5,1;cancel;Cancel]"
+			minetest.show_formspec(pname, "at_il_tsreset_"..ts_id, form)
+			return
+		end
+		
+		advtrains.interlocking.show_ts_form(ts_id, pname, sel_tcb)
+		return
+	end
+	
+	ts_id = string.match(formname, "^at_il_tsreset_(.+)$")
+	if ts_id and fields.reset then
+		local ts = ildb.get_ts(ts_id)
+		if not ts then return end
+		ts.trains = {}
+		if ts.route_post then
+			advtrains.interlocking.route.free_route_locks(ts_id, ts.route_post.locks)
+		end
+		ts.route_post = nil
+		ts.route = nil
+		for _, sigd in ipairs(ts.tc_breaks) do
+			local tcbs = ildb.get_tcbs(sigd)
+			advtrains.interlocking.update_signal_aspect(tcbs)
+		end
+		minetest.chat_send_player(pname, "Reset track section "..ts_id.."!")
+	end
+end)
+
+-- TCB marker entities
+
+-- table with objectRefs
+local markerent = {}
+
+minetest.register_entity("advtrains_interlocking:tcbmarker", {
+	visual = "mesh",
+	mesh = "trackplane.b3d",
+	textures = {"at_il_tcb_marker.png"},
+	collisionbox = {-1,-0.5,-1, 1,-0.4,1},
+	visual_size = {x=10, y=10},
+	on_punch = function(self)
+		self.object:remove()
+	end,
+	on_rightclick = function(self, player)
+		if self.tcbpos and player then
+			advtrains.interlocking.show_tcb_form(self.tcbpos, player:get_player_name())
+		end
+	end,
+	get_staticdata = function() return "STATIC" end,
+	on_activate = function(self, sdata) if sdata=="STATIC" then self.object:remove() end end,
+	static_save = false,
+})
+
+function advtrains.interlocking.show_tcb_marker(pos)
+	--atdebug("showing tcb marker",pos)
+	local tcb = ildb.get_tcb(pos)
+	if not tcb then return end
+	local node_ok, conns, rhe = advtrains.get_rail_info_at(pos, advtrains.all_tracktypes)
+	if not node_ok then return end
+	local yaw = advtrains.conn_angle_median(conns[2].c, conns[1].c)
+	
+	local itex = {}
+	for connid=1,2 do
+		local tcbs = tcb[connid]
+		local ts
+		if tcbs.ts_id then
+			ts = ildb.get_ts(tcbs.ts_id)
+		end
+		if ts then
+			itex[connid] = ts.name
+		else
+			itex[connid] = "--EOI--"
+		end
+	end
+	
+	local pts = advtrains.roundfloorpts(pos)
+	if markerent[pts] then
+		markerent[pts]:remove()
+	end
+	
+	local obj = minetest.add_entity(pos, "advtrains_interlocking:tcbmarker")
+	if not obj then return end
+	obj:set_yaw(yaw)
+	obj:set_properties({
+		infotext = "A = "..itex[1].."\nB = "..itex[2]
+	})
+	local le = obj:get_luaentity()
+	if le then le.tcbpos = pos end
+	
+	markerent[pts] = obj
+end
+
+-- Signalling formspec - set routes a.s.o
+
+-- textlist selection temporary storage
+local sig_pselidx = {}
+-- Players having a signalling form open
+local p_open_sig_form = {}
+
+function advtrains.interlocking.show_signalling_form(sigd, pname, sel_rte)
+	if not minetest.check_player_privs(pname, "train_operator") then
+		minetest.chat_send_player(pname, "Insufficient privileges to use this!")
+		return
+	end
+	local hasprivs = minetest.check_player_privs(pname, "interlocking")
+	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;Signal at "..minetest.pos_to_string(sigd.p).."]"
+	form = form.."field[0.8,1.5;5.2,1;name;Signal name;"..minetest.formspec_escape(tcbs.signal_name).."]"
+	form = form.."button[5.5,1.2;1,1;setname;Set]"
+	
+	if tcbs.routeset then
+		local rte = tcbs.routes[tcbs.routeset]
+		if not rte then
+			atwarn("Unknown route set from signal!")
+			tcbs.routeset = nil
+			return
+		end
+		form = form.."label[0.5,2.5;A route is requested from this signal:]"
+		form = form.."label[0.5,3.0;"..minetest.formspec_escape(rte.name).."]"
+		if tcbs.route_committed then
+			form = form.."label[0.5,3.5;Route has been set.]"
+		else
+			form = form.."label[0.5,3.5;Waiting for route to be set...]"
+			if tcbs.route_rsn then
+				form = form.."label[0.5,4;"..minetest.formspec_escape(tcbs.route_rsn).."]"
+			end
+		end
+		if not tcbs.route_auto then
+			form = form.."button[0.5,7;  5,1;auto;Enable Automatic Working]"
+		else
+			form = form.."label[0.5,7  ;Automatic Working is active.]"
+			form = form.."label[0.5,7.3;Route is re-set when a train passed.]"
+			form = form.."button[0.5,7.7;  5,1;noauto;Disable Automatic Working]"
+		end
+		
+		form = form.."button[0.5,6;  5,1;cancelroute;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"
+					end
+				end
+				strtab[#strtab+1] = clr .. minetest.formspec_escape(route.name)
+			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.."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[3.5,7;2,1;editroute;Edit]"
+				end
+			else
+				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
+			if hasprivs then
+				form = form.."button[0.5,8;2.5,1;newroute;New Route]"
+				form = form.."button[  3,8;2.5,1;unassign;Unassign Signal]"
+				form = form.."button[  3,9;2.5,1;influp;Influence Point]"
+			end
+			if tcbs.ars_disabled then
+				form = form.."button[0.5,9;2.5,1;arsenable;Enable ARS]"
+			else
+				form = form.."button[0.5,9;2.5,1;arsdisable;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;Inconsistent state: route_origin is same TCBS but no route set. Try again.]"
+			ilrs.cancel_route_from(sigd)
+		else
+			form = form.."label[0.5,2.5;Route is set over this signal by:\n"..sigd_to_string(tcbs.route_origin).."]"
+			form = form.."label[0.5,4;Wait for this route to be cancelled in order to do anything here.]"
+		end
+	end	
+	sig_pselidx[pname] = sel_rte
+	minetest.show_formspec(pname, "at_il_signalling_"..minetest.pos_to_string(sigd.p).."_"..sigd.s, form)
+	p_open_sig_form[pname] = sigd
+	
+	-- always a good idea to update the signal aspect
+	advtrains.interlocking.update_signal_aspect(tcbs)
+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)
+		end
+	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") then
+		return
+	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
+	if pts then
+		pos = minetest.string_to_pos(pts)
+		connid = tonumber(connids)
+		if not connid or connid<1 or connid>2 then return end
+	end
+	if pos and connid and not fields.quit then
+		local sigd = {p=pos, s=connid}
+		local tcbs = ildb.get_tcbs(sigd)
+		if not tcbs then return end
+		
+		local sel_rte
+		if fields.rtelist then
+			local tev = minetest.explode_textlist_event(fields.rtelist)
+			sel_rte = tev.index
+		elseif tpsi then
+			sel_rte = tpsi
+		end
+		if fields.setname and fields.name and hasprivs then
+			tcbs.signal_name = fields.name
+		end
+		if tcbs.routeset and fields.cancelroute then
+			if tcbs.routes[tcbs.routeset] and tcbs.routes[tcbs.routeset].ars then
+				tcbs.ars_disabled = true
+			end
+			-- if route committed, cancel route ts info
+			ilrs.update_route(sigd, tcbs, nil, true)
+		end
+		if not tcbs.routeset then
+			if fields.newroute and hasprivs then
+				advtrains.interlocking.init_route_prog(pname, sigd)
+				minetest.close_formspec(pname, formname)
+				return
+			end
+			if sel_rte and tcbs.routes[sel_rte] then
+				if fields.setroute then
+					ilrs.update_route(sigd, tcbs, sel_rte)
+				end
+				if fields.dsproute then
+					local t = os.clock()
+					advtrains.interlocking.visualize_route(sigd, tcbs.routes[sel_rte], "disp_"..t)
+					minetest.after(10, function() advtrains.interlocking.clear_visu_context("disp_"..t) end)
+				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
+			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, "Signal has been unassigned. Name and routes are kept for reuse.")
+				return
+			else
+				minetest.chat_send_player(pname, "Please cancel route first!")
+			end
+		end
+		if fields.influp and hasprivs then
+			advtrains.interlocking.show_ip_form(tcbs.signal, pname)
+			return
+		end
+		
+		if tcbs.ars_disabled and fields.arsenable then
+			tcbs.ars_disabled = nil
+		end
+		if not tcbs.ars_disabled and fields.arsdisable then
+			tcbs.ars_disabled = true
+		end
+		
+		if fields.auto then
+			tcbs.route_auto = true
+		end
+		if fields.noauto then
+			tcbs.route_auto = false
+		end
+		
+		advtrains.interlocking.show_signalling_form(sigd, pname, sel_rte)
+		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/advtrains_interlocking/textures/advtrains_dtrack_npr_placer.png b/advtrains/advtrains_interlocking/textures/advtrains_dtrack_npr_placer.png
new file mode 100644
index 0000000..0d1c769
--- /dev/null
+++ b/advtrains/advtrains_interlocking/textures/advtrains_dtrack_npr_placer.png
diff --git a/advtrains/advtrains_interlocking/textures/advtrains_dtrack_shared_npr.png b/advtrains/advtrains_interlocking/textures/advtrains_dtrack_shared_npr.png
new file mode 100644
index 0000000..0116c27
--- /dev/null
+++ b/advtrains/advtrains_interlocking/textures/advtrains_dtrack_shared_npr.png
diff --git a/advtrains/advtrains_interlocking/textures/at_il_route_end.png b/advtrains/advtrains_interlocking/textures/at_il_route_end.png
new file mode 100644
index 0000000..1433f0c
--- /dev/null
+++ b/advtrains/advtrains_interlocking/textures/at_il_route_end.png
diff --git a/advtrains/advtrains_interlocking/textures/at_il_route_lock.png b/advtrains/advtrains_interlocking/textures/at_il_route_lock.png
new file mode 100644
index 0000000..6a5269b
--- /dev/null
+++ b/advtrains/advtrains_interlocking/textures/at_il_route_lock.png
diff --git a/advtrains/advtrains_interlocking/textures/at_il_route_lock_edit.png b/advtrains/advtrains_interlocking/textures/at_il_route_lock_edit.png
new file mode 100644
index 0000000..df5f923
--- /dev/null
+++ b/advtrains/advtrains_interlocking/textures/at_il_route_lock_edit.png
diff --git a/advtrains/advtrains_interlocking/textures/at_il_route_set.png b/advtrains/advtrains_interlocking/textures/at_il_route_set.png
new file mode 100644
index 0000000..3531420
--- /dev/null
+++ b/advtrains/advtrains_interlocking/textures/at_il_route_set.png
diff --git a/advtrains/advtrains_interlocking/textures/at_il_route_start.png b/advtrains/advtrains_interlocking/textures/at_il_route_start.png
new file mode 100644
index 0000000..dcb5160
--- /dev/null
+++ b/advtrains/advtrains_interlocking/textures/at_il_route_start.png
diff --git a/advtrains/advtrains_interlocking/textures/at_il_routep_advance.png b/advtrains/advtrains_interlocking/textures/at_il_routep_advance.png
new file mode 100644
index 0000000..d971e85
--- /dev/null
+++ b/advtrains/advtrains_interlocking/textures/at_il_routep_advance.png
diff --git a/advtrains/advtrains_interlocking/textures/at_il_routep_end_here.png b/advtrains/advtrains_interlocking/textures/at_il_routep_end_here.png
new file mode 100644
index 0000000..9dd3088
--- /dev/null
+++ b/advtrains/advtrains_interlocking/textures/at_il_routep_end_here.png
diff --git a/advtrains/advtrains_interlocking/textures/at_il_routep_end_over.png b/advtrains/advtrains_interlocking/textures/at_il_routep_end_over.png
new file mode 100644
index 0000000..e03198b
--- /dev/null
+++ b/advtrains/advtrains_interlocking/textures/at_il_routep_end_over.png
diff --git a/advtrains/advtrains_interlocking/textures/at_il_routep_end_over_last.png b/advtrains/advtrains_interlocking/textures/at_il_routep_end_over_last.png
new file mode 100644
index 0000000..f4fb1aa
--- /dev/null
+++ b/advtrains/advtrains_interlocking/textures/at_il_routep_end_over_last.png
diff --git a/advtrains/advtrains_interlocking/textures/at_il_signal_asp_danger.png b/advtrains/advtrains_interlocking/textures/at_il_signal_asp_danger.png
new file mode 100644
index 0000000..fca786d
--- /dev/null
+++ b/advtrains/advtrains_interlocking/textures/at_il_signal_asp_danger.png
diff --git a/advtrains/advtrains_interlocking/textures/at_il_signal_asp_free.png b/advtrains/advtrains_interlocking/textures/at_il_signal_asp_free.png
new file mode 100644
index 0000000..e9d6e9c
--- /dev/null
+++ b/advtrains/advtrains_interlocking/textures/at_il_signal_asp_free.png
diff --git a/advtrains/advtrains_interlocking/textures/at_il_signal_asp_slow.png b/advtrains/advtrains_interlocking/textures/at_il_signal_asp_slow.png
new file mode 100644
index 0000000..9242bb3
--- /dev/null
+++ b/advtrains/advtrains_interlocking/textures/at_il_signal_asp_slow.png
diff --git a/advtrains/advtrains_interlocking/textures/at_il_signal_ip.png b/advtrains/advtrains_interlocking/textures/at_il_signal_ip.png
new file mode 100644
index 0000000..bf1618a
--- /dev/null
+++ b/advtrains/advtrains_interlocking/textures/at_il_signal_ip.png
diff --git a/advtrains/advtrains_interlocking/textures/at_il_signal_off.png b/advtrains/advtrains_interlocking/textures/at_il_signal_off.png
new file mode 100644
index 0000000..f9b1f79
--- /dev/null
+++ b/advtrains/advtrains_interlocking/textures/at_il_signal_off.png
diff --git a/advtrains/advtrains_interlocking/textures/at_il_tcb_marker.png b/advtrains/advtrains_interlocking/textures/at_il_tcb_marker.png
new file mode 100644
index 0000000..3efc38a
--- /dev/null
+++ b/advtrains/advtrains_interlocking/textures/at_il_tcb_marker.png
diff --git a/advtrains/advtrains_interlocking/textures/at_il_tcb_node.png b/advtrains/advtrains_interlocking/textures/at_il_tcb_node.png
new file mode 100644
index 0000000..d5f615f
--- /dev/null
+++ b/advtrains/advtrains_interlocking/textures/at_il_tcb_node.png
diff --git a/advtrains/advtrains_interlocking/textures/at_il_tool.png b/advtrains/advtrains_interlocking/textures/at_il_tool.png
new file mode 100644
index 0000000..f6ce1cc
--- /dev/null
+++ b/advtrains/advtrains_interlocking/textures/at_il_tool.png
diff --git a/advtrains/advtrains_interlocking/textures/at_il_turnout_cr_l.png b/advtrains/advtrains_interlocking/textures/at_il_turnout_cr_l.png
new file mode 100644
index 0000000..fb79e3d
--- /dev/null
+++ b/advtrains/advtrains_interlocking/textures/at_il_turnout_cr_l.png
diff --git a/advtrains/advtrains_interlocking/textures/at_il_turnout_cr_r.png b/advtrains/advtrains_interlocking/textures/at_il_turnout_cr_r.png
new file mode 100644
index 0000000..e04dfbd
--- /dev/null
+++ b/advtrains/advtrains_interlocking/textures/at_il_turnout_cr_r.png
diff --git a/advtrains/advtrains_interlocking/textures/at_il_turnout_free.png b/advtrains/advtrains_interlocking/textures/at_il_turnout_free.png
new file mode 100644
index 0000000..5c83193
--- /dev/null
+++ b/advtrains/advtrains_interlocking/textures/at_il_turnout_free.png
diff --git a/advtrains/advtrains_interlocking/textures/at_il_turnout_st.png b/advtrains/advtrains_interlocking/textures/at_il_turnout_st.png
new file mode 100644
index 0000000..50d5ad5
--- /dev/null
+++ b/advtrains/advtrains_interlocking/textures/at_il_turnout_st.png
diff --git a/advtrains/advtrains_interlocking/tool.lua b/advtrains/advtrains_interlocking/tool.lua
new file mode 100644
index 0000000..5d38b3a
--- /dev/null
+++ b/advtrains/advtrains_interlocking/tool.lua
@@ -0,0 +1,66 @@
+-- tool.lua
+-- Interlocking tool
+
+local ilrs = advtrains.interlocking.route
+
+minetest.register_craftitem("advtrains_interlocking:tool",{
+	description = "Interlocking tool\nright-click turnouts to inspect route locks",
+	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()
+		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
+			if advtrains.is_passive(pos) then
+				local form = "size[7,5]label[0.5,0.5;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;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)
+			else
+				minetest.chat_send_player(pname, "Cannot use this here.")
+				return
+			end
+		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, "interlocking") then
+		return
+	end
+	local pos
+	local pts = string.match(formname, "^at_il_rtool_(.+)$")
+	if pts then
+		pos = minetest.string_to_pos(pts)
+	end
+	if pos then
+		if advtrains.is_passive(pos) then
+			if fields.clear then
+				ilrs.remove_route_locks(pts)
+			end
+			if fields.emplace then
+				ilrs.add_manual_route_lock(pts, "Manual lock ("..pname..")")
+			end
+		end
+	end
+end)
diff --git a/advtrains/advtrains_interlocking/train_sections.lua b/advtrains/advtrains_interlocking/train_sections.lua
new file mode 100644
index 0000000..757f36a
--- /dev/null
+++ b/advtrains/advtrains_interlocking/train_sections.lua
@@ -0,0 +1,199 @@
+-- train_related.lua
+-- Occupation of track sections - mainly implementation of train callbacks
+
+--[[
+Track section occupation is saved as follows
+
+In train:
+train.il_sections = {
+	[n] = {ts_id = <...> (origin = <sigd>)}
+}
+-- "origin" is the TCB (signal describer) the train initially entered this section
+
+In track section
+ts.trains = {
+	[n] = <train_id>
+}
+
+When any inconsistency is detected, we will assume the most restrictive setup.
+It will be possible to indicate a section "free" via the GUI.
+]]
+
+local ildb = advtrains.interlocking.db
+
+local sigd_equal = advtrains.interlocking.sigd_equal
+
+local function itexist(tbl, com)
+	for _,item in ipairs(tbl) do
+		if (item==com) then
+			return true
+		end
+	end
+	return false
+end
+local function itkexist(tbl, ikey, com)
+	for _,item in ipairs(tbl) do
+		if item[ikey] == com then
+			return true
+		end
+	end
+	return false
+end
+
+local function itremove(tbl, com)
+	local i=1
+	while i <= #tbl do
+		if tbl[i] == com then
+			table.remove(tbl, i)
+		else
+			i = i + 1
+		end
+	end
+end
+local function itkremove(tbl, ikey, com)
+	local i=1
+	while i <= #tbl do
+		if tbl[i][ikey] == com then
+			table.remove(tbl, i)
+		else
+			i = i + 1
+		end
+	end
+end
+
+local function setsection(tid, train, ts_id, ts, sigd)
+	-- train
+	if not train.il_sections then train.il_sections = {} end
+	if not itkexist(train.il_sections, "ts_id", ts_id) then
+		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
+		table.insert(ts.trains, tid)
+	end
+	
+	-- routes
+	local tcbs = advtrains.interlocking.db.get_tcbs(sigd)
+	
+	-- 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
+			-- 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
+		end
+		ts.route = nil
+	end
+	if tcbs.signal then
+		advtrains.interlocking.route.update_route(sigd, tcbs)
+	end
+end
+
+local function freesection(tid, train, ts_id, ts)
+	-- train
+	if not train.il_sections then train.il_sections = {} end
+	itkremove(train.il_sections, "ts_id", ts_id)
+	
+	-- ts
+	if not ts.trains then ts.trains = {} end
+	itremove(ts.trains, tid)
+	
+	if ts.route_post then
+		advtrains.interlocking.route.free_route_locks(ts_id, ts.route_post.locks)
+		if ts.route_post.next then
+			--this does nothing when the train went the right way, because
+			-- "route" info is already cleared.
+			advtrains.interlocking.route.cancel_route_from(ts.route_post.next)
+		end
+		ts.route_post = nil
+	end
+	-- This must be delayed, because this code is executed in-between a train step
+	-- TODO use luaautomation timers?
+	minetest.after(0, advtrains.interlocking.route.update_waiting, "ts", ts_id)
+end
+
+
+-- This is regular operation
+-- The train is on a track and drives back and forth
+
+-- 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
+		end
+	end
+end)
+
+
+-- this time, of course, only clear the backside (cp connid)
+advtrains.tnc_register_on_leave(function(pos, id, train, index)
+	local tcb = ildb.get_tcb(pos)
+	if tcb and train.path_cp[index] then
+		local connid = train.path_cp[index]
+		local ts = tcb[connid].ts_id and ildb.get_ts(tcb[connid].ts_id)
+		if ts then
+			freesection(id, train, tcb[connid].ts_id, ts)
+		end
+	end
+end)
+
+-- those callbacks are needed to account for created and removed trains (also regarding coupling)
+
+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)
+	if ts_id then
+		local ts = ildb.get_ts(ts_id)
+		if ts then
+			setsection(id, train, ts_id, ts, origin)
+		else
+			atwarn("ILDB corruption: TCB",origin," has invalid TS reference")
+		end
+		-- Make train a shunt move
+		train.is_shunt = true
+	elseif ts_id==nil then
+		atlog("Train",id,": Unable to determine whether to block a track section!")
+	else
+		--atdebug("Train",id,": Outside of interlocked area!")
+	end
+end)
+
+advtrains.te_register_on_remove(function(id, train)
+	if train.il_sections then
+		for idx, item in ipairs(train.il_sections) do
+			
+			local ts = item.ts_id and ildb.get_ts(item.ts_id)
+			
+			if ts and ts.trains then
+				itremove(ts.trains, id)
+			end
+		end
+		train.il_sections = nil
+	end
+end)
diff --git a/advtrains/advtrains_interlocking/tsr_rail.lua b/advtrains/advtrains_interlocking/tsr_rail.lua
new file mode 100644
index 0000000..a500c8f
--- /dev/null
+++ b/advtrains/advtrains_interlocking/tsr_rail.lua
@@ -0,0 +1,56 @@
+-- tsr_rail.lua
+-- Point speed restriction rails
+-- 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 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", "Point speed restriction: "..npr)
+	meta:set_string("formspec", "field[npr;Set point speed restriction:;"..npr.."]")
+end
+
+
+local adefunc = function(def, preset, suffix, rotation)
+		return {
+			after_place_node=function(pos)
+				updateform(pos)
+			end,
+			after_dig_node=function(pos)
+				local pe = advtrains.encode_pos(pos)
+				advtrains.interlocking.npr_rails[pe] = nil
+			end,
+			on_receive_fields = function(pos, formname, fields, player)
+				if fields.npr then
+					local pe = advtrains.encode_pos(pos)
+					advtrains.interlocking.npr_rails[pe] = tonumber(fields.npr)
+					updateform(pos)
+				end
+			end,
+			advtrains = {
+				on_train_approach = function(pos,train_id, train, index)
+					if train.path_cn[index] == 1 then
+						local pe = advtrains.encode_pos(pos)
+						local npr = advtrains.interlocking.npr_rails[pe] or 2
+						advtrains.lzb_add_checkpoint(train, index, npr, nil)
+					end
+				end,
+			},
+		}
+end
+
+
+if minetest.get_modpath("advtrains_train_track") ~= nil then
+	advtrains.register_tracks("default", {
+		nodename_prefix="advtrains_interlocking:dtrack_npr",
+		texture_prefix="advtrains_dtrack_npr",
+		models_prefix="advtrains_dtrack",
+		models_suffix=".b3d",
+		shared_texture="advtrains_dtrack_shared_npr.png",
+		description="Point Speed Restriction Rail",
+		formats={},
+		get_additional_definiton = adefunc,
+	}, advtrains.trackpresets.t_30deg_straightonly)
+end
+\ No newline at end of file
diff --git a/advtrains/advtrains_itrainmap/depends.txt b/advtrains/advtrains_itrainmap/depends.txt
new file mode 100644
index 0000000..6f00bf6
--- /dev/null
+++ b/advtrains/advtrains_itrainmap/depends.txt
@@ -0,0 +1 @@
+advtrains
+\ No newline at end of file
diff --git a/advtrains/advtrains_itrainmap/init.lua b/advtrains/advtrains_itrainmap/init.lua
new file mode 100644
index 0000000..0443609
--- /dev/null
+++ b/advtrains/advtrains_itrainmap/init.lua
@@ -0,0 +1,149 @@
+
+
+local map_def={
+	example = {
+		p1x=168,
+		p1z=530,
+		p2x=780,
+		p2z=1016,
+		background="itm_example.png",
+	},
+}
+
+local itm_cache={}
+local itm_pdata={}
+local itm_conf_mindia=0.1
+
+minetest.register_privilege("itm", { description = "Allows to display train map", give_to_singleplayer = true, default = false })
+
+local function create_map_form_with_bg(d)
+	local minx, minz, maxx, maxz = math.min(d.p1x, d.p2x), math.min(d.p1z, d.p2z), math.max(d.p1x, d.p2x), math.max(d.p1z, d.p2z)
+	local form_x, form_z=10,10
+	local edge_x, edge_z = form_x/(maxx-minx), form_z/(maxz-minz)
+	local len_x, len_z=math.max(edge_x, itm_conf_mindia), math.max(edge_z, itm_conf_mindia)
+	local form="size["..(form_x+edge_x)..","..(form_z+edge_z).."] background[0,0;0,0;"..d.background..";true] "
+	local lbl={}
+	
+	for pts, tid in pairs(advtrains.detector.on_node) do
+		local pos=minetest.string_to_pos(pts)
+		form=form.."box["..(edge_x*(pos.x-minx))..","..(form_z-(edge_z*(pos.z-minz)))..";"..len_x..","..len_z..";red]"
+		lbl[sid(tid)]=pos
+	end
+	
+	for t_id, xz in pairs(lbl) do
+		form=form.."label["..(edge_x*(xz.x-minx))..","..(form_x-(edge_z*(xz.z-minz)))..";"..t_id.."]"
+	end
+	return form
+end
+
+local function create_map_form(d)
+	if d.background then
+		return create_map_form_with_bg(d)
+	end
+	
+	local minx, minz, maxx, maxz = math.min(d.p1x, d.p2x), math.min(d.p1z, d.p2z), math.max(d.p1x, d.p2x), math.max(d.p1z, d.p2z)
+	local form_x, form_z=10,10
+	local edge_x, edge_z = form_x/(maxx-minx), form_z/(maxz-minz)
+	local len_x, len_z=math.max(edge_x, itm_conf_mindia), math.max(edge_z, itm_conf_mindia)
+	local form="size["..(form_x+edge_x)..","..(form_z+edge_z).."]"
+	local lbl={}
+	
+	for x,itx in pairs(itm_cache) do
+		if x>=minx and x<=maxx then
+			for z,y in pairs(itx) do
+				if z>=minz and z<=maxz then
+					local adn=advtrains.detector.get({x=x, y=y, z=z})
+					local color="gray"
+					if adn then
+						color="red"
+						lbl[sid(adn)]={x=x, z=z}
+					end
+					form=form.."box["..(edge_x*(x-minx))..","..(form_z-(edge_z*(z-minz)))..";"..len_x..","..len_z..";"..color.."]"
+				end
+			end
+		end
+	end
+	for t_id, xz in pairs(lbl) do
+		form=form.."label["..(edge_x*(xz.x-minx))..","..(form_x-(edge_z*(xz.z-minz)))..";"..t_id.."]"
+	end
+	return form
+end
+
+local function cache_ndb()
+	itm_cache={}
+	local ndb_nodes=advtrains.ndb.get_nodes()
+	for y, xzt in pairs(ndb_nodes) do
+		for x, zt in pairs(xzt) do
+			for z, _ in pairs(zt) do
+				if not itm_cache[x] then
+					itm_cache[x]={}
+				end
+				itm_cache[x][z]=y
+			end
+		end
+	end
+end
+
+minetest.register_chatcommand("itm", {
+	params="[x1 z1 x2 z2] or [mdef]",
+	description="Display advtrains train map of given area.\nFirst form:[x1 z1 x2 z2] - specify area directly.\nSecond form:[mdef] - Use a predefined map background(see init.lua)\nThird form: No parameters - use WorldEdit position markers.",
+	privs={itm=true},
+	func = function(name, param)
+		local mdef=string.match(param, "^(%S+)$")
+		if mdef then
+			local d=map_def[mdef]
+			if not d then
+				return false, "Map definiton not found: "..mdef
+			end
+			itm_pdata[name]=map_def[mdef]
+			minetest.show_formspec(name, "itrainmap", create_map_form(d))
+			return true, "Showing train map: "..mdef
+		end
+		local x1, z1, x2, z2=string.match(param, "^(%S+) (%S+) (%S+) (%S+)$")
+		if not (x1 and z1 and x2 and z2) then
+			if worldedit then
+				local wep1, wep2=worldedit.pos1[name], worldedit.pos2[name]
+				if wep1 and wep2 then
+					x1, z1, x2, z2=wep1.x, wep1.z, wep2.x, wep2.z
+				end
+			end
+		end
+		if not (x1 and z1 and x2 and z2) then
+			return false, "Invalid parameters and no WE positions set"
+		end
+		local d={p1x=x1, p1z=z1, p2x=x2, p2z=z2}
+		itm_pdata[name]=d
+		minetest.show_formspec(name, "itrainmap", create_map_form(d))
+		return true, "Showing ("..x1..","..z1..")-("..x2..","..z2..")"
+	end,
+})
+minetest.register_chatcommand("itm_cache_ndb", {
+	params="",
+	description="Cache advtrains node database again. Run when tracks changed.",
+	privs={itm=true},
+	func = function(name, param)
+		cache_ndb()
+		return true, "Done caching node database."
+	end,
+})
+
+local timer=0
+function advtrains_itm_mainloop(dtime)
+	timer=timer-math.min(dtime, 0.1)
+	if timer<=0 then
+		for pname,d in pairs(itm_pdata) do
+			minetest.show_formspec(pname, "itrainmap", create_map_form(d))
+		end
+		timer=2
+	end
+end
+minetest.register_on_player_receive_fields(function(player, formname, fields)
+	if formname=="itrainmap" and fields.quit then
+		itm_pdata[player:get_player_name()]=nil
+	end
+end)
+
+function advtrains_itm_init()
+	--automatically run itm_cache_ndb
+	minetest.after(2, cache_ndb)
+end
diff --git a/advtrains/advtrains_itrainmap/textures/itm_example.png b/advtrains/advtrains_itrainmap/textures/itm_example.png
new file mode 100644
index 0000000..caf084a
--- /dev/null
+++ b/advtrains/advtrains_itrainmap/textures/itm_example.png
diff --git a/advtrains/advtrains_line_automation/depends.txt b/advtrains/advtrains_line_automation/depends.txt
new file mode 100644
index 0000000..ce2e23c
--- /dev/null
+++ b/advtrains/advtrains_line_automation/depends.txt
@@ -0,0 +1,2 @@
+advtrains_interlocking
+advtrains_train_track?
+\ No newline at end of file
diff --git a/advtrains/advtrains_line_automation/init.lua b/advtrains/advtrains_line_automation/init.lua
new file mode 100644
index 0000000..7b758bc
--- /dev/null
+++ b/advtrains/advtrains_line_automation/init.lua
@@ -0,0 +1,47 @@
+-- Advtrains line automation system
+
+advtrains.lines = {
+	-- [station code] = {name=..., owner=...}
+	stations = {},
+	
+	--[[ [new pos hash] = {
+		stn = <station code>,
+		track = <platform identifier>,
+		doors = <door side L,R,C>
+		wait = <least wait time>
+		reverse = <boolean>
+		signal = <position of signal that is the "exit signal" for this platform>
+	}]]
+	stops = {},
+}
+
+
+local modpath = minetest.get_modpath(minetest.get_current_modname()) .. DIR_DELIM
+
+dofile(modpath.."railwaytime.lua")
+dofile(modpath.."scheduler.lua")
+dofile(modpath.."stoprail.lua")
+
+
+function advtrains.lines.load(data)
+	if data then
+		advtrains.lines.stations = data.stations or {}
+		advtrains.lines.stops = data.stops or {}
+		advtrains.lines.rwt.set_time(data.rwt_time)
+		advtrains.lines.sched.load(data.scheduler_queue)
+	end
+end
+
+function advtrains.lines.save()
+	return {
+		stations = advtrains.lines.stations,
+		stops = advtrains.lines.stops,
+		rwt_time = advtrains.lines.rwt.get_time(),
+		scheduler_queue = advtrains.lines.sched.save()
+	}
+end
+
+function advtrains.lines.step(dtime)
+	advtrains.lines.rwt.step(dtime)
+	advtrains.lines.sched.run()
+end
diff --git a/advtrains/advtrains_line_automation/railwaytime.lua b/advtrains/advtrains_line_automation/railwaytime.lua
new file mode 100644
index 0000000..258009e
--- /dev/null
+++ b/advtrains/advtrains_line_automation/railwaytime.lua
@@ -0,0 +1,308 @@
+-- railwaytime.lua
+-- Advtrains uses a desynchronized time for train movement. Everything is counted relative to this time counter.
+-- The advtrains-internal time is in no way synchronized to the real-life time, due to:
+-- - Lag
+-- - Server stops/restarts
+-- However, this means that implementing a "timetable" system using the "real time" is not practical. Therefore,
+-- we introduce a custom time system, the RWT(Railway Time), which has nothing to do with RLT(Real-Life Time)
+-- RWT has a time cycle of 1 hour. This should be sufficient for most train lines that will ever be built in Minetest.
+-- A RWT looks like this:    37;25
+-- The ; is to distinguish it from a normal RLT (which has colons e.g. 12:34:56). Left number is minutes, right number is seconds.
+-- The minimum RWT is 00;00, the maximum is 59;59.
+-- It is OK to leave one places out at either end, esp. when writing relative times, such as:
+-- 43;3   22;0   2;30   0;10  ;10
+-- Those places are then filled with zeroes. Indeed, ";" would be valid for 00;00 .
+
+-- There is an "adapt mode", which was proposed by gpcf, and results in RWT automatically adapting itself to real-world time.
+-- It works by shifting the minute/second after the realtime minute/second, adjusting the cycle value as needed.
+
+-- Using negative times is discouraged. If you need a negative time, you may insert a minus (-) ONLY in the "c" place
+
+--[[
+1;23;45 = {
+	s=45,
+	m=23,
+	c=1, -- Cycle(~hour), not displayed most time
+}
+
+Railway times can exist in 3 forms:
+- as table (see above)
+- as string (like "12;34")
+- as number (of seconds)
+
+Forms are automagically converted as needed by the converter functions to_*
+To be sure a rwt is in the required form, explicitly use a converter.
+
+]]
+
+local rwt = {}
+
+--Time Stamp (Seconds since start of world)
+local e_time = 0
+local e_has_loaded = false
+
+local setting_rwt_real = minetest.settings:get("advtrains_lines_rwt_realtime")
+if setting_rwt_real=="" then
+	setting_rwt_real = "independent"
+end
+
+local e_last_epoch -- last real-time timestamp
+
+-- Advance RWT to match minute/second to the current real-world time
+-- only accounts for the minute/second part, leaves hour/cycle untouched
+local function adapt_real_time()
+	local datetab = os.date("*t")
+	local real_sectotal = 60*datetab.min + datetab.sec
+	
+	local rwttab = rwt.now()
+	local rwt_sectotal = 60*rwttab.m + rwttab.s
+	
+	--calculate the difference and take it %3600 (seconds/hour) to always move forward
+	local secsfwd = (real_sectotal - rwt_sectotal) % 3600
+	
+	atlog("[lines][rwt] Skipping",secsfwd,"seconds forward to sync rwt (",rwt.to_string(rwttab),") to real time (",os.date("%H:%M:%S"),")")
+	
+	e_time = e_time + secsfwd
+end
+
+function rwt.set_time(t)
+	e_time = t or 0
+	if setting_rwt_real == "adapt_real" then
+		adapt_real_time()
+	end
+	atlog("[lines][rwt] Initialized railway time: ",rwt.to_string(e_time))
+	e_last_epoch = os.time()
+	
+	e_has_loaded = true
+end
+
+function rwt.get_time()
+	return e_time
+end
+
+function rwt.step(dt)
+	if not e_has_loaded then
+		rwt.set_time(0)
+	end
+
+	if setting_rwt_real=="independent" then
+		-- Regular stepping with dtime
+		e_time = e_time + dt		
+	else
+		-- advance with real-world time
+		local diff = os.time() - e_last_epoch
+		e_last_epoch = os.time()
+		
+		if diff>0 then
+			e_time = e_time + diff
+		end
+	end
+end
+
+function rwt.now()
+	return rwt.to_table(e_time)
+end
+
+function rwt.new(c, m, s)
+	return {
+		c = c or 0,
+		m = m or 0,
+		s = s or 0
+	}
+end
+function rwt.copy(rwtime)
+	local rwtimet = rwt.to_table(rwtime)
+	return {
+		c = rwtimet.c or 0,
+		m = rwtimet.m or 0,
+		s = rwtimet.s or 0
+	}
+end
+
+function rwt.to_table(rwtime)
+	if type(rwtime) == "table" then
+		return rwtime
+	elseif type(rwtime) == "string" then
+		return rwt.parse(rwtime)
+	elseif type(rwtime) == "number" then
+		local res = {}
+		local seconds = atfloor(rwtime)
+		res.s = seconds % 60
+		local minutes = atfloor(seconds/60)
+		res.m = minutes % 60
+		res.c = atfloor(minutes/60)
+		return res
+	end
+end
+
+function rwt.to_secs(rwtime, c_over)
+	local res = rwtime
+	if type(rwtime) == "string" then
+		res = rwt.parse(rwtime)
+	elseif type(rwtime) == "number" then
+		return rwtime
+	end
+	if type(res)=="table" then
+		return (c_over or res.c)*60*60 + res.m*60 + res.s
+	end
+end
+
+function rwt.to_string(rwtime_p, no_cycle)
+	local rwtime = rwt.to_table(rwtime_p)
+	if rwtime.c~=0 and not no_cycle then
+		return string.format("%d;%02d;%02d", rwtime.c, rwtime.m, rwtime.s)
+	else
+		return string.format("%02d;%02d", rwtime.m, rwtime.s)
+	end
+end
+
+---
+
+local function v_n(str, cpl)
+	if not str then return nil end
+	if str == "" then
+		return 0
+	end
+	local n = tonumber(str)
+	if not cpl and (n<0 or n>59) then
+		return nil
+	end
+	return n
+end
+
+function rwt.parse(str)
+	--atdebug("parse",str)
+	--3-value form
+	local str_c, str_m, str_s = string.match(str, "^(%-?%d?%d?);(%d%d);(%d?%d?)$")
+	if str_c and str_m and str_s then
+		--atdebug("3v",str_c, str_m, str_s)
+		local c, m, s = v_n(str_c, true), v_n(str_m), v_n(str_s)
+		if c and m and s then
+			return rwt.new(c,m,s)
+		end
+	end
+	--2-value form
+	local str_m, str_s = string.match(str, "^(%d?%d?);(%d?%d?)$")
+	if str_m and str_s then
+		--atdebug("2v",str_m, str_s)
+		local m, s = v_n(str_m), v_n(str_s)
+		if m and s then
+			return rwt.new(0,m,s)
+		end
+	end
+end
+
+---
+
+function rwt.add(t1, t2)
+	local t1s = rwt.to_secs(t1)
+	local t2s = rwt.to_secs(t2)
+	return rwt.to_table(t1s + t2s)
+end
+
+-- How many seconds FROM t1 TO t2
+function rwt.diff(t1, t2)
+	local t1s = rwt.to_secs(t1)
+	local t2s = rwt.to_secs(t2)
+	return t2s - t1s
+end
+
+-- Subtract t2 from t1 (inverted argument order compared to diff())
+function rwt.sub(t1, t2)
+	return rwt.to_table(rwt.diff(t2, t1))
+end
+
+-- Adjusts t2 by thresh and then returns time from t1 to t2
+function rwt.adj_diff(t1, t2, thresh)
+	local newc = rwt.adjust_cycle(t2, thresh, t1)
+	local t1s = rwt.to_secs(t1)
+	local t2s = rwt.to_secs(t2, newc)
+	return t1s - t2s
+end
+
+
+
+-- Threshold values
+-- "reftime" is the time to which this is made relative and defaults to now.
+rwt.CA_FUTURE	= 60*60 - 1		-- Selected so that time lies at or in the future of reftime (at nearest point in time)
+rwt.CA_FUTURES	= 60*60 		-- Same, except when times are equal, advances one full cycle
+rwt.CA_PAST		= 0				-- Selected so that time lies at or in the past of reftime
+rwt.CA_PASTS	= -1	 		-- Same, except when times are equal, goes back one full cycle
+rwt.CA_CENTER	= 30*60			-- If time is within past 30 minutes of reftime, selected as past, else selected as future.
+
+-- Adjusts the "cycle" value of a railway time to be in some relation to reftime.
+-- Returns new cycle
+function rwt.adjust_cycle(rwtime, reftime_p, thresh)
+	local reftime = reftime_p or rwt.now()
+	
+	local reftimes = rwt.to_secs(reftime)
+	
+	local rwtimes = rwt.to_secs(rwtime, 0)
+	local timeres = reftimes + thresh - rwtimes
+	local cycles = atfloor(timeres / (60*60))
+
+	return cycles
+end
+
+function rwt.adjust(rwtime, reftime, thresh)
+	local cp = rwt.copy(rwtime)
+	cp.c = rwt.adjust_cycle(rwtime, reftime, thresh)
+	return cp
+end
+
+-- Useful for departure times: returns time (in seconds)
+-- until the next (adjusted FUTURE) occurence of deptime is reached
+-- in this case, rwtime is used as reftime and deptime should lie in the future of rwtime
+-- rwtime defaults to NOW
+function rwt.get_time_until(deptime, rwtime_p)
+	local rwtime = rwtime_p or rwt.now()
+	return rwt.adj_diff(rwtime, deptime, rwt.CA_FUTURE)
+end
+
+
+-- Helper functions for handling "repeating times" (rpt)
+-- Those are generic declarations for time intervals like "every 5 minutes", with an optional offset
+-- ( /02;00-00;45 in timetable syntax
+
+-- Get the time (in seconds) until the next time this rpt occurs
+function rwt.time_to_next_rpt(rwtime, rpt_interval, rpt_offset)
+	local rpti_s   = rwt.to_secs(rpt_interval)
+	
+	return (rpti_s - rwt.time_from_last_rpt(rwtime, rpti_s, rpt_offset)) % rpti_s
+	-- Modulo is just there to clip a false value of rpti_s to 0
+end
+
+
+-- Get the time (in seconds) since the last time this rpt occured
+function rwt.time_from_last_rpt(rwtime, rpt_interval, rpt_offset)
+	local rwtime_s = rwt.to_secs(rwtime)
+	local rpti_s   = rwt.to_secs(rpt_interval)
+	local rpto_s   = rwt.to_secs(rpt_offset)
+	
+	return ((rwtime_s - rpto_s) % rpti_s)
+end
+
+-- From rwtime, get the next time that is divisible by rpt_interval offset by rpt_offset
+function rwt.next_rpt(rwtime, rpt_interval, rpt_offset)
+	local rwtime_s = rwt.to_secs(rwtime)
+	local rpti_s   = rwt.to_secs(rpt_interval)
+	local time_from_last = rwt.time_from_last_rpt(rwtime_s, rpti_s, rpt_offset)
+	
+	local res_s = rwtime_s - time_from_last + rpti_s
+	
+	return rwt.to_table(res_s)
+end
+
+-- from rwtime, get the last time that this rpt matched (which is actually just next_rpt - rpt_offset
+function rwt.last_rpt(rwtime, rpt_interval, rpt_offset)
+	local rwtime_s = rwt.to_sec(rwtime)
+	local rpti_s   = rwt.to_sec(rpt_interval)
+	local time_from_last = rwt.time_from_last_rpt(rwtime, rpt_interval, rpt_offset)
+	
+	local res_s = rwtime_s - time_from_last
+	
+	return rwt.to_table(res_s)
+end
+
+
+advtrains.lines.rwt = rwt
diff --git a/advtrains/advtrains_line_automation/readme.txt b/advtrains/advtrains_line_automation/readme.txt
new file mode 100644
index 0000000..3280ce9
--- /dev/null
+++ b/advtrains/advtrains_line_automation/readme.txt
@@ -0,0 +1,5 @@
+== advtrains_line_automation
+This mod provides an extension to the interlocking system which allows to automatically operate trains on train lines.
+
+This extension makes use of the table
+advtrains.lines
+\ No newline at end of file
diff --git a/advtrains/advtrains_line_automation/scheduler.lua b/advtrains/advtrains_line_automation/scheduler.lua
new file mode 100644
index 0000000..6025b02
--- /dev/null
+++ b/advtrains/advtrains_line_automation/scheduler.lua
@@ -0,0 +1,133 @@
+-- scheduler.lua
+-- Implementation of a Railway time schedule queue
+-- In contrast to the LuaATC interrupt queue, this one can handle many different
+-- event receivers. This is done by registering a callback with the scheduler
+
+local ln = advtrains.lines
+local sched = {}
+
+local UNITS_THRESH = 10
+local MAX_PER_ITER = 10
+
+local callbacks = {}
+
+-- Register a handler callback to handle scheduler items.
+-- e - a handler identifier (corresponds to "handler" in enqueue() )
+-- func - a function(evtdata) to be executed when a schedule item expires
+--        evtdata - arbitrary data that has been passed into enqueue()
+function sched.register_callback(e, func)
+	callbacks[e] = func
+end
+
+--[[
+{
+	t = <railway time in seconds>
+	e = <handler callback>
+	d = <data table>
+	u = <unit identifier>
+}
+The "unit identifier" is there to prevent schedule overflows. It can be, for example, the position hash
+of a node or a train ID. If the number of schedules for a unit exceeds UNITS_THRESH, further schedules are
+blocked.
+]]--
+local queue = {}
+
+local units_cnt = {}
+
+function sched.load(data)
+	if data then
+		for i,elem in ipairs(data) do
+			table.insert(queue, elem)
+			units_cnt[elem.u] = (units_cnt[elem.u] or 0) + 1
+		end
+		atlog("[lines][scheduler] Loaded the schedule queue,",#data,"items.")
+	end
+end
+function sched.save()
+	return queue
+end
+
+function sched.run()
+	local ctime = ln.rwt.get_time()
+	local cnt = 0
+	local ucn, elem
+	while cnt <= MAX_PER_ITER do
+		elem = queue[1]
+		if elem and elem.t <= ctime then
+			table.remove(queue, 1)
+			if callbacks[elem.e] then
+				-- run it
+				callbacks[elem.e](elem.d)
+			else
+				atwarn("[lines][scheduler] No callback to handle schedule",elem)
+			end
+			cnt=cnt+1
+			ucn = units_cnt[elem.u]
+			if ucn and ucn>0 then
+				units_cnt[elem.u] = ucn - 1
+			end
+		else
+			break
+		end
+	end
+end
+
+-- Enqueue a new scheduled item to be executed at "rwtime"
+-- handler: a string identifying the handler to use (registered with sched.register_callback())
+-- evtdata: Arbitrary Lua data to be passed to the handler callback
+-- unitid: An arbitrary string uniquely identifying the thing that is issuing this enqueue.
+--    used to prevent expotentially growing "scheduler bombs"
+-- unitlim: Custom override for UNITS_THRESH (see there)
+function sched.enqueue(rwtime, handler, evtdata, unitid, unitlim)
+	local qtime = ln.rwt.to_secs(rwtime)
+	assert(type(handler)=="string")
+	assert(type(unitid)=="string")
+	assert(type(unitlim)=="number")
+	
+	local cnt=1
+	local ucn, elem
+	
+	ucn = (units_cnt[unitid] or 0)
+	local ulim=(unitlim or UNITS_THRESH)
+	if ucn >= ulim then
+		atlog("[lines][scheduler] discarding enqueue for",handler,"(limit",ulim,") because unit",unitid,"has already",ucn,"schedules enqueued")
+		return false
+	end
+	
+	while true do
+		elem = queue[cnt]
+		if not elem or elem.t > qtime then
+			table.insert(queue, cnt, {
+					t=qtime,
+					e=handler,
+					d=evtdata,
+					u=unitid,
+				})
+			units_cnt[unitid] = ucn + 1
+			return true
+		end
+		cnt = cnt+1
+	end
+end
+
+-- See enqueue(). Same meaning, except that rwtime is relative to now.
+function sched.enqueue_in(rwtime, handler, evtdata, unitid, unitlim)
+	local ctime = ln.rwt.get_time()
+	local rwtime_s = ln.rwt.to_secs(rwtime)
+	sched.enqueue(ctime + rwtime_s, handler, evtdata, unitid, unitlim)
+end
+
+-- Discards all schedules for unit "unitid" (removes them from the queue)
+function sched.discard_all(unitid)
+	local i = 1
+	while i<=#queue do
+		if queue[i].u == unitid then
+			table.remove(queue,i)
+		else
+			i=i+1
+		end
+	end
+	units_cnt[unitid] = 0
+end
+
+ln.sched = sched
diff --git a/advtrains/advtrains_line_automation/settingtypes.txt b/advtrains/advtrains_line_automation/settingtypes.txt
new file mode 100644
index 0000000..ea3f66e
--- /dev/null
+++ b/advtrains/advtrains_line_automation/settingtypes.txt
@@ -0,0 +1,6 @@
+# This controls how the Railway Time relates to real-world time:
+# *independent - RWT counts independent of real time synchronized to ingame steps. Recommended for singleplayer and ad-hoc servers.
+# *follow_real - RWT is independent of real time, but counts up in real-world time speed
+# *adapt_real - RWT adapts its minute and second to real-world time. When the server is stopped and restarted, this results in a "time jump".
+# Time will jump for 1 cycle (59;59) at maximum.
+advtrains_lines_rwt_realtime (RWT real time adaption) enum independent independent,follow_real,adapt_real
+\ No newline at end of file
diff --git a/advtrains/advtrains_line_automation/stoprail.lua b/advtrains/advtrains_line_automation/stoprail.lua
new file mode 100644
index 0000000..ee8faac
--- /dev/null
+++ b/advtrains/advtrains_line_automation/stoprail.lua
@@ -0,0 +1,218 @@
+-- stoprail.lua
+-- adds "stop rail". Recognized by lzb. (part of behavior is implemented there)
+
+
+local function to_int(n)
+	--- Disallow floating-point numbers
+	local k = tonumber(n)
+	if k then
+		return math.floor(k)
+	end
+end
+
+local function updatemeta(pos)
+	local meta = minetest.get_meta(pos)
+	local pe = advtrains.encode_pos(pos)
+	local stdata = advtrains.lines.stops[pe]
+	if not stdata then
+		meta:set_string("infotext", "Error")
+	end
+	
+	meta:set_string("infotext", "Stn. "..stdata.stn.." T. "..stdata.track)
+end
+
+local door_dropdown = {L=1, R=2, C=3}
+local door_dropdown_rev = {Right="R", Left="L", Closed="C"}
+
+local function show_stoprailform(pos, player)
+	local pe = advtrains.encode_pos(pos)
+	local pname = player:get_player_name()
+	if minetest.is_protected(pos, pname) then
+		minetest.chat_send_player(pname, "Position is protected!")
+		return
+	end
+	
+	local stdata = advtrains.lines.stops[pe]
+	if not stdata then
+		advtrains.lines.stops[pe] = {
+					stn="", track="", doors="R", wait=10, ars={default=true}, ddelay=1,speed="M"
+				}
+		stdata = advtrains.lines.stops[pe]
+	end
+	
+	local stn = advtrains.lines.stations[stdata.stn]
+	local stnname = stn and stn.name or ""
+	if not stdata.ddelay then
+		stdata.ddelay = 1
+	end
+	if not stdata.speed then
+		stdata.speed = "M"
+	end
+	
+	local form = "size[8,7]"
+	form = form.."field[0.5,0.5;7,1;stn;"..attrans("Station Code")..";"..minetest.formspec_escape(stdata.stn).."]"
+	form = form.."field[0.5,1.5;7,1;stnname;"..attrans("Station Name")..";"..minetest.formspec_escape(stnname).."]"
+	form = form.."field[0.5,2.5;2,1;ddelay;"..attrans("Door Delay")..";"..minetest.formspec_escape(stdata.ddelay).."]"
+	form = form.."field[3,2.5;3,1;speed;"..attrans("Departure Speed")..";"..minetest.formspec_escape(stdata.speed).."]"	
+	form = form.."label[0.5,3;Door side:]"
+	form = form.."dropdown[0.5,3;2;doors;Left,Right,Closed;"..door_dropdown[stdata.doors].."]"
+	form = form.."dropdown[3,3;1.5;reverse;---,Reverse;"..(stdata.reverse and 2 or 1).."]"
+	
+	form = form.."field[5,3.5;2,1;track;"..attrans("Track")..";"..minetest.formspec_escape(stdata.track).."]"
+	form = form.."field[5,4.5;2,1;wait;"..attrans("Stop Time")..";"..stdata.wait.."]"
+	
+	form = form.."textarea[0.5,4;4,2;ars;Trains stopping here (ARS rules);"..advtrains.interlocking.ars_to_text(stdata.ars).."]"
+	
+	form = form.."button[0.5,6;7,1;save;"..attrans("Save").."]"
+	
+	minetest.show_formspec(pname, "at_lines_stop_"..pe, form)
+end
+
+minetest.register_on_player_receive_fields(function(player, formname, fields)
+	local pname = player:get_player_name()
+	local pe = string.match(formname, "^at_lines_stop_(............)$")
+	local pos = advtrains.decode_pos(pe)
+	if pos then
+		if minetest.is_protected(pos, pname) then
+			minetest.chat_send_player(pname, "Position is protected!")
+			return
+		end
+		
+		local stdata = advtrains.lines.stops[pe]
+		if fields.save then
+			if fields.stn and stdata.stn ~= fields.stn then
+				if fields.stn ~= "" then
+					local stn = advtrains.lines.stations[fields.stn]
+					if stn then
+						if (stn.owner == pname or minetest.check_player_privs(pname, "train_admin")) then
+							stdata.stn = fields.stn
+						else
+							minetest.chat_send_player(pname, "Station code '"..fields.stn.."' does already exist and is owned by "..stn.owner)
+						end
+					else
+						advtrains.lines.stations[fields.stn] = {name = fields.stnname, owner = pname}
+						stdata.stn = fields.stn
+					end
+				end
+				updatemeta(pos)
+				show_stoprailform(pos, player)
+				return
+			end
+			local stn = advtrains.lines.stations[stdata.stn]
+			if stn and fields.stnname and fields.stnname ~= stn.name then
+				if (stn.owner == pname or minetest.check_player_privs(pname, "train_admin")) then
+					stn.name = fields.stnname
+				else
+					minetest.chat_send_player(pname, "Not allowed to edit station name, owned by "..stn.owner)
+				end
+			end
+			
+			-- dropdowns
+			if fields.doors then
+				stdata.doors = door_dropdown_rev[fields.doors] or "C"
+			end
+			if fields.reverse then
+				stdata.reverse = fields.reverse == "Reverse"
+			end
+			
+			
+			if fields.track then
+				stdata.track = fields.track
+			end
+			if fields.wait then
+				stdata.wait = to_int(fields.wait) or 10
+			end
+			
+			if fields.ars then
+				stdata.ars = advtrains.interlocking.text_to_ars(fields.ars)
+			end
+
+			if fields.ddelay then
+				stdata.ddelay = to_int(fields.ddelay) or 1
+			end
+			if fields.speed then
+				stdata.speed = to_int(fields.speed) or "M"
+			end
+			
+			--TODO: signal
+			updatemeta(pos)
+			show_stoprailform(pos, player)
+		end
+	end			
+	
+end)
+
+
+local adefunc = function(def, preset, suffix, rotation)
+		return {
+			after_place_node=function(pos)
+				local pe = advtrains.encode_pos(pos)
+				advtrains.lines.stops[pe] = {
+					stn="", track="", doors="R", wait=10
+				}
+				updatemeta(pos)
+			end,
+			after_dig_node=function(pos)
+				local pe = advtrains.encode_pos(pos)
+				advtrains.lines.stops[pe] = nil
+			end,
+			on_rightclick = function(pos, node, player)
+				show_stoprailform(pos, player)
+			end,
+			advtrains = {
+				on_train_approach = function(pos,train_id, train, index)
+					if train.path_cn[index] == 1 then
+						local pe = advtrains.encode_pos(pos)
+						local stdata = advtrains.lines.stops[pe]
+						if stdata and stdata.stn then
+						
+							--TODO REMOVE AFTER SOME TIME (only migration)
+							if not stdata.ars then
+								stdata.ars = {default=true}
+							end
+							if stdata.ars and (stdata.ars.default or advtrains.interlocking.ars_check_rule_match(stdata.ars, train) ) then
+								advtrains.lzb_add_checkpoint(train, index, 2, nil)
+								local stn = advtrains.lines.stations[stdata.stn]
+								local stnname = stn and stn.name or "Unknown Station"
+								train.text_inside = "Next Stop:\n"..stnname
+							end
+						end
+					end
+				end,
+				on_train_enter = function(pos, train_id, train, index)
+					if train.path_cn[index] == 1 then
+						local pe = advtrains.encode_pos(pos)
+						local stdata = advtrains.lines.stops[pe]
+						if not stdata then
+							return
+						end
+						
+						if stdata.ars and (stdata.ars.default or advtrains.interlocking.ars_check_rule_match(stdata.ars, train) ) then
+							local stn = advtrains.lines.stations[stdata.stn]
+							local stnname = stn and stn.name or "Unknown Station"
+							
+							-- Send ATC command and set text
+							advtrains.atc.train_set_command(train, "B0 W O"..stdata.doors.." D"..stdata.wait.." OC "..(stdata.reverse and "R" or "").."D"..(stdata.ddelay or 1) .. "S" ..(stdata.speed or "M"), true)
+							train.text_inside = stnname
+							if tonumber(stdata.wait) then
+								minetest.after(tonumber(stdata.wait), function() train.text_inside = "" end)
+							end
+						end
+					end
+				end
+			},
+		}
+end
+
+if minetest.get_modpath("advtrains_train_track") ~= nil then
+	advtrains.register_tracks("default", {
+		nodename_prefix="advtrains_line_automation:dtrack_stop",
+		texture_prefix="advtrains_dtrack_stop",
+		models_prefix="advtrains_dtrack",
+		models_suffix=".b3d",
+		shared_texture="advtrains_dtrack_shared_stop.png",
+		description="Station/Stop Rail",
+		formats={},
+		get_additional_definiton = adefunc,
+	}, advtrains.trackpresets.t_30deg_straightonly)
+end
+\ No newline at end of file
diff --git a/advtrains/advtrains_line_automation/textures/advtrains_dtrack_shared_stop.png b/advtrains/advtrains_line_automation/textures/advtrains_dtrack_shared_stop.png
new file mode 100644
index 0000000..b6629cf
--- /dev/null
+++ b/advtrains/advtrains_line_automation/textures/advtrains_dtrack_shared_stop.png
diff --git a/advtrains/advtrains_line_automation/textures/advtrains_dtrack_stop_placer.png b/advtrains/advtrains_line_automation/textures/advtrains_dtrack_stop_placer.png
new file mode 100644
index 0000000..0d1c769
--- /dev/null
+++ b/advtrains/advtrains_line_automation/textures/advtrains_dtrack_stop_placer.png
diff --git a/advtrains/advtrains_luaautomation/README.txt b/advtrains/advtrains_luaautomation/README.txt
new file mode 100644
index 0000000..287a0bd
--- /dev/null
+++ b/advtrains/advtrains_luaautomation/README.txt
@@ -0,0 +1,288 @@
+
+#### Advtrains - Lua Automation features
+
+This mod offers components that run LUA code and interface with each other through a global environment. It makes complex automated railway systems possible.
+
+### atlatc
+The mod is sometimes abbreviated as 'atlatc'. This stands for AdvTrainsLuaATC. This short name has been chosen for user convenience, since the name of this mod ('advtrains_luaautomation') is very long.
+
+### Privilege
+To perform any operations using this mod (except executing operation panels), players need the "atlatc" privilege.
+This privilege should never be granted to anyone except trusted administrators. Even though the LUA environment is sandboxed, it is still possible to DoS the server by coding infinite loops or requesting expotentially growing interrupts. 
+
+### Active and passive
+Active components are these who have LUA code running in them. They are triggered on specific events. Passive components are dumb, they only have a state and can be set to another state, they can't perform actions themselves.
+
+### Environments
+
+Each active component is assigned to an environment. This is where all data are held. Components in different environments can't inferface with each other.
+This system allows multiple independent automation systems to run simultaneously without polluting each other's environment.
+
+/env_create <env_name>
+Create environment with the given name. To be able to do anything, you first need to create an environment. Choose the name wisely, you can't change it afterwards.
+
+/env_setup <env_name>
+Invoke the form to edit the environment's initialization code. For more information, see the section on active components. You can also delete an environment from here.
+
+### Active components
+
+The code of every active component is run on specific events which are explained soon. When run, every variable written that is not local and is no function or userdata is saved over code re-runs and over server restarts. Additionally, the following global variables are defined:
+
+# event
+The variable 'event' contains a table with information on the current event. How this table can look is explained below.
+
+# S
+The variable 'S' contains a table which is shared between all components of the environment. Its contents are persistent over server restarts. May not contain functions, every other value is allowed.
+Example:
+Component 1: S.stuff="foo"
+Component 2: print(S.stuff)
+-> foo
+
+# F
+The variable 'F' also contains a table which is shared between all components of the environment. Its contents are discarded on server shutdown or when the init code gets re-run. Every data type is allowed, even functions.
+The purpose of this table is not to save data, but to provide static value and function definitions. The table should be populated by the init code.
+
+# Standard Lua functions
+The following standard Lua libraries are available:
+string, math, table, os
+The following standard Lua functions are available:
+assert, error, ipairs, pairs, next, select, tonumber, tostring, type, unpack
+
+Every attempt to overwrite any of the predefined values results in an error.
+
+# LuaAutomation-specific global functions
+
+POS(x,y,z)
+Shorthand function to create a position vector {x=?, y=?, z=?} with less characters
+
+In the following functions, all parameters named 'pos' designate a position. You can use either:
+- a default Minetest position vector (like {x=34, y=2, z=-18})
+- the POS(34,2,-18) shorthand
+- A string, the passive component name. See 'passive component naming'.
+
+getstate(pos)
+Get the state of the passive component at position 'pos'. See section on passive components for more info.
+pos can be either a position vector (created by POS()) or a string, the name of this passive component.
+
+setstate(pos, newstate)
+Set the state of the passive component at position 'pos'.
+
+is_passive(pos)
+Checks whether there is a passive component at the position pos (and/or whether a passive component with this name exists)
+
+interrupt(time, message)
+Cause LuaAutomation to trigger an 'int' event on this component after the given time in seconds with the specified 'message' field. 'message' can be of any Lua data type.
+Not available in init code!
+
+interrupt_pos(pos, message)
+Immediately trigger an 'ext_int' event on the active component at position pos. 'message' is like in interrupt().
+USE WITH CARE, or better don't use! Incorrect use can result in expotential growth of interrupts.
+
+digiline_send(channel, message)
+Make this active component send a digiline message on the specified channel.
+Not available in init code!
+
+-- The next 4 functions are available when advtrains_interlocking is enabled: --
+
+can_set_route(pos, route_name)
+Returns whether it is possible to set the route designated by route_name from the signal at pos.
+
+set_route(pos, route_name)
+Requests the given route from the signal at pos. Has the same effect as clicking "Set Route" in the signalling dialog.
+
+cancel_route(pos)
+Cancels the route that is set from the signal at pos. Has the same effect as clicking "Cancel Route" in the signalling dialog.
+
+get_aspect(pos)
+Returns the signal aspect of the signal at pos. A signal aspect has the following format:
+aspect = {
+	main = { -- the next track section in line. Shows blocked for shunt routes
+		free = <boolean>,
+		speed = <int km/h>,
+	},
+	shunt = { -- whether a "shunting allowed" aspect should be shown
+		free = <boolean>,
+	}
+	dst = { -- the aspect of the next main signal on (at end of) route
+		free = <boolean>,
+		speed = <int km/h>,
+	}
+	info = {
+		call_on = <boolean>, -- Call-on route, expect train in track ahead
+		dead_end = <boolean>, -- Route ends on a dead end (e.g. bumper)
+	}
+}
+As of August 2018, only the aspect.main.free field is ever used by the interlocking system.
+
+# Lines
+
+The advtrains_line_automation component adds a few contraptions that should make creating timeable systems easier.
+Part of its functionality is also available in LuaATC:
+
+- rwt.* - all Railway Time functions are included as documented in https://advtrains.de/wiki/doku.php?id=dev:lines:rwt
+
+- schedule(rw_time, msg)
+- schedule_in(rw_dtime, msg)
+Schedules an event of type {type="schedule", schedule=true, msg=msg} at (resp. after) the specified railway time.
+(which can be in any format). You can only schedule one event this way. (uses the new lines-internal scheduler)
+
+## Components and events
+
+The event table is a table of the following format:
+{
+	type = "<type>",
+	<type> = true,
+	... additional content ...
+}
+You can check for the event type by either using
+if event.type == "wanted" then ...do stuff... end
+or
+if event.wanted then ...do stuff... end
+(if 'wanted' is the event type to check for)
+
+# Init code
+The initialization code is not a component as such, but rather a part of the whole environment. It can (and should) be used to make definitions that other components can refer to.
+Examples:
+A function to define behavior for trains in subway stations:
+function F.station()
+	if event.train then atc_send("B0WOL") end
+	if event.int and event.message="depart" then atc_send("OCD1SM") end
+end
+
+The init code is run whenever the F table needs to be refilled with data. This is the case on server startup and whenever the init code is changed and you choose to run it.
+Functions are run in the environment of the currently active node, regardless of where they were defined. So, the 'event' table always reflects the state of the calling node.
+
+The 'event' table of the init code is always {type="init", init=true}.
+
+# ATC rails
+The Lua-controlled ATC rails are the only components that can actually interface with trains. The following event types are generated:
+
+{type="train", train=true, id="<train_id>"}
+This event is fired when a train enters the rail. The field 'id' is the unique train ID, which is 6-digit random numerical string.
+If the world contains trains from an older advtrains version, this string may be longer and contain a dot (.)
+
+{type="int", int=true, msg=<message>}
+Fired when an interrupt set by the 'interrupt' function runs out. 'message' is the message passed to the interrupt function.
+For backwards compatiblity reasons, <message> is also contained in an event.message field.
+{type="ext_int", ext_int=true, message=<message>}
+Fired when another node called 'interrupt_pos' on this position. 'message' is the message passed to the interrupt_pos function.
+
+{type="digiline", digiline=true, channel=<channel>, msg=<message>}
+Fired when the controller receives a digiline message.
+
+In addition to the default environment functions, the following functions are available:
+
+atc_send(<atc_command>)
+	Sends the specified ATC command to the train and returns true. If there is no train, returns false and does nothing.
+atc_reset()
+	Resets the train's current ATC command. If there is no train, returns false and does nothing.
+atc_arrow
+	Boolean, true when the train is driving in the direction of the arrows of the ATC rail. Nil if there is no train.
+atc_id
+	Train ID of the train currently passing the controller. Nil if there's no train.
+atc_speed
+	Speed of the train, or nil if there is no train.
+atc_set_text_outside(text)
+	Set text shown on the outside of the train. Pass nil to show no text.
+atc_set_text_inside(text)
+	Set text shown to train passengers. Pass nil to show no text.
+get_line()
+	Returns the "Line" property of the train (a string).
+	This can be used to distinguish between trains of different lines and route them appropriately.
+	The interlocking system also uses this property for Automatic Routesetting.
+set_line(line)
+	Sets the "Line" property of the train (a string).
+	If the first digit of this string is a number (0-9), any subway wagons on the train will have this one displayed as line number
+	(where "0" is actually shown as Line 10 on the train)
+get_rc()
+	Returns the "Routingcode" property of the train (a string).
+	The interlocking system uses this property for Automatic Routesetting.
+set_rc(routingcode)
+	Sets the "Routingcode" property of the train (a string).
+	The interlocking system uses this property for Automatic Routesetting.
+split_at_index(index, command)
+	Splits the train at the specified index, into a train with index-1 wagons and a second train starting with the index-th wagon.
+	command specifies an atc command to be sent to the second train after decoupling.
+split_at_fc(command, len)
+	Splits the train in such a way that all cars with non-empty
+	current FC of the first part of the train have the same FC. The
+	command specified is sent to the rear part, as with
+	split_at_index.  It returns the fc of the cars of the first part.
+
+	The optional argument len specifies the maximum length for the
+	first part of the train. Say, we have len=3, and the train has ""
+	"" "foo" "foo" "foo" "bar", then the first train part will be ""
+	"" "foo".
+
+	Example : Train has current FCs "" "" "foo" "bar" "foo"
+	Result: first train: "" "" "foo"; second train: "bar" "foo"
+	The command returns "foo" in this case
+split_off_locomotive(command, len)
+	Splits off the locomotives at the front of the train, which are
+	identified by an empty FC.  command specifies the command to be
+	executed by the rear half of the train.
+
+	The optional argument len specifies the maximum length for the
+	first part of the train. Say, we have len=3, and the train has ""
+	"" "foo" "foo" "foo" "bar", then the first train part will be ""
+	"" "foo".	
+step_fc()
+	Steps the FCs of all train cars forward. FCs are composed of codes
+	separated by exclamation marks (!), for instance
+	"foo!bar!baz". Each wagon has a current FC, indicating its next
+	destination. Stepping the freight code forward, selects the next
+	code after the !. If the end of the string is reached, then the
+	first code is selected, except if the string ends with a question
+	mark, then the order is reversed.
+
+train_length()
+	returns the number of cars the train is composed of
+set_autocouple()
+	Sets the train into autocouple mode 
+unset_autocouple()
+	Unsets autocouple mode
+
+set_shunt(), unset_shunt()
+	deprecated aliases for set_autocouple() and unset_autocouple(), will be removed from a later release.
+
+
+# Operator panel
+This simple node executes its actions when punched. It can be used to change a switch and update the corresponding signals or similar applications.
+
+The event fired is {type="punch", punch=true} by default. In case of an interrupt or a digiline message, the events are similar to the ones of the ATC rail.
+
+### Passive components
+
+All passive components can be interfaced with the setstate and getstate functions(see above).
+Below, each apperance is mapped to the "state" of that node.
+
+## Signals
+The light signals are interfaceable, the analog signals are not.
+"green" - Signal shows green light
+"red" - Signal shows red light
+
+## Switches
+All default rail switches are interfaceable, independent of orientation.
+"cr" - The switch is set in the direction that is not straight.
+"st" - The switch is set in the direction that is straight.
+
+## Mesecon Switch
+The Mesecon switch can be switched using LuaAutomation. Note that this is not possible on levers, only the full-node 'Switch' block.
+"on" - the switch is switched on
+"off" - the switch is switched off
+
+##Andrew's Cross
+"on" - it blinks
+"off" - it does not blink
+
+### Passive component naming
+You can assign names to passive components using the Passive Component Naming tool.
+Once you set a name for any component, you can reference it by that name in the getstate() and setstate() functions, like this:
+(Imagine a signal that you have named "Stn_P1_out" at position (1,2,3) )
+setstate("Stn_P1_out", "green") instead of setstate(POS(1,2,3), "green")
+This way, you don't need to memorize positions.
+
+PC-Naming can also be used to name interlocking signals for route setting via the set_route() functions. IMPORTANT: The "Signal Name" set in the
+signalling formspec is completely independent and can NOT be used to look up the position, you need to explicitly use the PCNaming tool.
+
+--TODO: Ein paar mehr Codebeispiele wären schön, insbesondere mit os.date und so...
diff --git a/advtrains/advtrains_luaautomation/active_common.lua b/advtrains/advtrains_luaautomation/active_common.lua
new file mode 100644
index 0000000..dac81b3
--- /dev/null
+++ b/advtrains/advtrains_luaautomation/active_common.lua
@@ -0,0 +1,175 @@
+
+
+local ac = {nodes={}}
+
+function ac.load(data)
+	if data then
+		ac.nodes=data.nodes
+	end
+end
+function ac.save()
+	return {nodes = ac.nodes}
+end
+
+function ac.after_place_node(pos, player)
+	local meta=minetest.get_meta(pos)
+	meta:set_string("formspec", ac.getform(pos, meta))
+	meta:set_string("infotext", "LuaAutomation component, unconfigured.")
+	local ph=minetest.pos_to_string(pos)
+	--just get first available key!
+	for en,_ in pairs(atlatc.envs) do
+		ac.nodes[ph]={env=en}
+		return
+	end
+end
+function ac.getform(pos, meta_p)
+	local meta = meta_p or minetest.get_meta(pos)
+	local envs_asvalues={}
+	
+	local ph=minetest.pos_to_string(pos)
+	local nodetbl = ac.nodes[ph]
+	local env, code, err = nil, "", ""
+	if nodetbl then
+		code=nodetbl.code or ""
+		err=nodetbl.err or ""
+		env=nodetbl.env or ""
+	end
+	local sel = 1
+	for n,_ in pairs(atlatc.envs) do
+		envs_asvalues[#envs_asvalues+1]=minetest.formspec_escape(n)
+		if n==env then
+			sel=#envs_asvalues
+		end
+	end
+	local form = "size[10,10]dropdown[0,0;3;env;"..table.concat(envs_asvalues, ",")..";"..sel.."]"
+		.."button[4,0;2,1;save;Save]button[7,0;2,1;cle;Clear local env] textarea[0.2,1;10,10;code;Code;"..minetest.formspec_escape(code).."]"
+		.."label[0,9.8;"..err.."]"
+	return form
+end
+
+function ac.after_dig_node(pos, node, player)
+	advtrains.invalidate_all_paths(pos)
+	advtrains.ndb.clear(pos)
+	local ph=minetest.pos_to_string(pos)
+	ac.nodes[ph]=nil
+end
+
+function ac.on_receive_fields(pos, formname, fields, player)
+	if not minetest.check_player_privs(player:get_player_name(), {atlatc=true}) then
+		minetest.chat_send_player(player:get_player_name(), "Missing privilege: atlatc - Operation cancelled!")
+		return
+	end
+	
+	local meta=minetest.get_meta(pos)
+	local ph=minetest.pos_to_string(pos)
+	local nodetbl = ac.nodes[ph] or {}
+	--if fields.quit then return end
+	if fields.env then
+		nodetbl.env=fields.env
+	end
+	if fields.code then
+		nodetbl.code=fields.code
+	end
+	if fields.save then
+		-- reset certain things
+		nodetbl.err=nil
+		if advtrains.lines and advtrains.lines.sched then
+			-- discard all schedules for this node
+			advtrains.lines.sched.discard_all(advtrains.encode_pos(pos))
+		end
+	end
+	if fields.cle then
+		nodetbl.data={}
+	end
+	
+	ac.nodes[ph]=nodetbl
+	
+	meta:set_string("formspec", ac.getform(pos, meta))
+	if nodetbl.env then
+		meta:set_string("infotext", "LuaAutomation component, assigned to environment '"..nodetbl.env.."'")
+	else
+		meta:set_string("infotext", "LuaAutomation component, invalid enviroment set!")
+	end
+end
+
+function ac.run_in_env(pos, evtdata, customfct_p)
+	local ph=minetest.pos_to_string(pos)
+	local nodetbl = ac.nodes[ph]
+	if not nodetbl then
+		atwarn("LuaAutomation component at",ph,": Data not in memory! Please visit component and click 'Save'!")
+		return
+	end
+	
+	local meta
+	if minetest.get_node_or_nil(pos) then
+		meta=minetest.get_meta(pos)
+	end
+	
+	if not nodetbl.env or not atlatc.envs[nodetbl.env] then
+		atwarn("LuaAutomation component at",ph,": Not an existing environment: "..(nodetbl.env or "<nil>"))
+		return false
+	end
+	if not nodetbl.code or nodetbl.code=="" then
+		atwarn("LuaAutomation component at",ph,": No code to run! (insert -- to suppress warning)")
+		return false
+	end
+	
+	local customfct=customfct_p or {}
+	-- add interrupt function
+	customfct.interrupt=function(t, imesg)
+		assertt(t, "number")
+		assert(t >= 0)
+		atlatc.interrupt.add(t, pos, {type="int", int=true, message=imesg, msg=imesg}) --Compatiblity "message" field.
+	end
+	-- add digiline_send function, if digiline is loaded
+	if minetest.global_exists("digiline") then
+		customfct.digiline_send=function(channel, msg)
+			assertt(channel, "string")
+			digiline:receptor_send(pos, digiline.rules.default, channel, msg)
+		end
+	end
+	-- add lines scheduler if enabled
+	if advtrains.lines and advtrains.lines.sched then
+		customfct.schedule = function(rwtime, msg)
+			return advtrains.lines.sched.enqueue(rwtime, "atlatc_env", {pos=pos, msg=msg}, advtrains.encode_pos(pos), 1)
+		end
+		customfct.schedule_in = function(rwtime, msg)
+			return advtrains.lines.sched.enqueue_in(rwtime, "atlatc_env", {pos=pos, msg=msg}, advtrains.encode_pos(pos), 1)
+		end
+	end
+	
+	local datain=nodetbl.data or {}
+	local succ, dataout = atlatc.envs[nodetbl.env]:execute_code(datain, nodetbl.code, evtdata, customfct)
+	if succ then
+		atlatc.active.nodes[ph].data=atlatc.remove_invalid_data(dataout)
+	else
+		atlatc.active.nodes[ph].err=dataout
+		atwarn("LuaAutomation ATC interface rail at",ph,": LUA Error:",dataout)
+		if meta then
+			meta:set_string("infotext", "LuaAutomation ATC interface rail, ERROR:"..dataout)
+		end
+	end
+	if meta then
+		meta:set_string("formspec", ac.getform(pos, meta))
+	end
+end
+
+function ac.on_digiline_receive(pos, node, channel, msg)
+	atlatc.interrupt.add(0, pos, {type="digiline", digiline=true, channel = channel, msg = msg})
+end
+
+if advtrains.lines and advtrains.lines.sched then
+	advtrains.lines.sched.register_callback("atlatc_env", function(data)
+		-- This adds another interrupt to the atlatc queue... there might be a better way
+		atlatc.interrupt.add(0, data.pos, {type="schedule",schedule=true, msg=data.msg})
+	end)
+end
+
+ac.trackdef_advtrains_defs = {
+	on_train_enter = function(pos, train_id)
+		--do async. Event is fired in train steps
+		atlatc.interrupt.add(0, pos, {type="train", train=true, id=train_id})
+	end,
+}
+
+atlatc.active=ac
diff --git a/advtrains/advtrains_luaautomation/atc_rail.lua b/advtrains/advtrains_luaautomation/atc_rail.lua
new file mode 100644
index 0000000..6083dfc
--- /dev/null
+++ b/advtrains/advtrains_luaautomation/atc_rail.lua
@@ -0,0 +1,194 @@
+-- atc_rail.lua
+-- registers and handles the ATC rail. Active component.
+-- This is the only component that can interface with trains, so train interface goes here too.
+
+--Using subtable
+local r={}
+
+function r.fire_event(pos, evtdata)
+	
+	local ph=minetest.pos_to_string(pos)
+	local railtbl = atlatc.active.nodes[ph]
+	
+	if not railtbl then
+		atwarn("LuaAutomation ATC interface rail at",ph,": Data not in memory! Please visit position and click 'Save'!")
+		return
+	end
+	
+	
+	local arrowconn = railtbl.arrowconn
+	if not arrowconn then
+		atwarn("LuaAutomation ATC interface rail at",ph,": Incomplete Data! Please visit position and click 'Save'!")
+		return
+	end
+	
+	--prepare ingame API for ATC. Regenerate each time since pos needs to be known
+	--If no train, then return false.
+	local train_id=advtrains.get_train_at_pos(pos)
+	local train, atc_arrow, tvel
+	if train_id then train=advtrains.trains[train_id] end
+	if train then 
+		if not train.path then
+			--we happened to get in between an invalidation step
+			--delay
+			atlatc.interrupt.add(0,pos,evtdata)
+			return
+		end
+		local index = advtrains.path_lookup(train, pos)
+				
+		local iconnid = 1
+		if index then
+			iconnid = train.path_cn[index]
+		else
+			atwarn("ATC rail at", pos, ": Rail not on train's path! Can't determine arrow direction. Assuming +!")
+		end
+		atc_arrow = iconnid == 1
+		
+		tvel=train.velocity
+	end
+	local customfct={
+		atc_send = function(cmd)
+			if not train_id then return false end
+			assertt(cmd, "string")
+			advtrains.atc.train_set_command(train, cmd, atc_arrow)
+			return true
+		end,
+		split_at_index = function(index, cmd)
+			if not train_id then return false end
+			assertt(cmd, "string")
+			if type(index) ~= "number" then
+				return false
+			end
+			local new_id = advtrains.split_train_at_index(train, index)
+			if new_id then
+				minetest.after(1,advtrains.atc.train_set_command,advtrains.trains[new_id], cmd, atc_arrow)
+				return true
+			end
+			return false
+		end,
+		split_at_fc = function(cmd, len)
+			assertt(cmd, "string")
+			if not train_id then return false end
+			local new_id, fc = advtrains.split_train_at_fc(train, false, len)
+			if new_id then
+				minetest.after(1,advtrains.atc.train_set_command,advtrains.trains[new_id], cmd, atc_arrow)
+			end
+			return fc or ""
+		end,
+		split_off_locomotive = function(cmd, len)
+			assertt(cmd, "string")
+			if not train_id then return false end
+			local new_id, fc = advtrains.split_train_at_fc(train, true, len)
+			if new_id then
+				minetest.after(1,advtrains.atc.train_set_command,advtrains.trains[new_id], cmd, atc_arrow)
+			end						
+		end,
+		train_length = function ()
+			if not train_id then return false end
+			return #train.trainparts
+		end,
+		step_fc = function()
+			if not train_id then return false end
+			advtrains.train_step_fc(train)
+		end,
+		set_shunt = function()
+			if not train_id then return false end
+			train.autocouple = true
+		end,
+		unset_shunt = function()
+			if not train_id then return false end
+			train.autocouple = nil
+		end,
+		set_autocouple = function ()
+			if not train_id then return false end
+			train.autocouple = true			
+		end,
+		unset_autocouple = function ()
+			if not train_id then return false end
+			train.autocouple = nil
+		end,
+		set_line = function(line)
+			if type(line)~="string" and type(line)~="number" then
+				return false
+			end
+			train.line = line .. ""
+			minetest.after(0, advtrains.invalidate_path, train_id)
+			return true
+		end,
+		get_line = function()
+			return train.line
+		end,
+		set_rc = function(rc)
+			if type(rc)~="string"then
+				return false
+			end
+			train.routingcode = rc
+			minetest.after(0, advtrains.invalidate_path, train_id)
+			return true
+		end,
+		get_rc = function()
+			return train.routingcode
+		end,
+		atc_reset = function(cmd)
+			if not train_id then return false end
+			assertt(cmd, "string")
+			advtrains.atc.train_reset_command(train)
+			return true
+		end,
+		atc_arrow = atc_arrow,
+		atc_id = train_id,
+		atc_speed = tvel,
+		atc_set_text_outside = function(text)
+			if not train_id then return false end
+			if text then assertt(text, "string") end
+			advtrains.trains[train_id].text_outside=text
+			return true
+		end,
+		atc_set_text_inside = function(text)
+			if not train_id then return false end
+			if text then assertt(text, "string") end
+			advtrains.trains[train_id].text_inside=text
+			return true
+		end,
+	}
+	
+	atlatc.active.run_in_env(pos, evtdata, customfct)
+	
+end
+
+if minetest.get_modpath("advtrains_train_track") ~= nil then
+	advtrains.register_tracks("default", {
+		nodename_prefix="advtrains_luaautomation:dtrack",
+		texture_prefix="advtrains_dtrack_atc",
+		models_prefix="advtrains_dtrack",
+		models_suffix=".b3d",
+		shared_texture="advtrains_dtrack_shared_atc.png",
+		description=atltrans("LuaAutomation ATC Rail"),
+		formats={},
+		get_additional_definiton = function(def, preset, suffix, rotation)
+			return {
+				after_place_node = atlatc.active.after_place_node,
+				after_dig_node = atlatc.active.after_dig_node,
+				on_receive_fields = function(pos, ...)
+					atlatc.active.on_receive_fields(pos, ...)
+					--set arrowconn (for ATC)
+					local ph=minetest.pos_to_string(pos)
+					local _, conns=advtrains.get_rail_info_at(pos, advtrains.all_tracktypes)
+					atlatc.active.nodes[ph].arrowconn=conns[1].c
+				end,
+				advtrains = atlatc.active.trackdef_advtrains_defs,
+				luaautomation = {
+					fire_event=r.fire_event
+				},
+				digiline = {
+					receptor = {},
+					effector = {
+						action = atlatc.active.on_digiline_receive
+					},
+				},
+			}
+		end,
+	}, advtrains.trackpresets.t_30deg_straightonly)
+end
+
+atlatc.rail = r
diff --git a/advtrains/advtrains_luaautomation/chatcmds.lua b/advtrains/advtrains_luaautomation/chatcmds.lua
new file mode 100644
index 0000000..2d0c69d
--- /dev/null
+++ b/advtrains/advtrains_luaautomation/chatcmds.lua
@@ -0,0 +1,84 @@
+--chatcmds.lua
+--Registers commands to modify the init and step code for LuaAutomation
+
+--position helper.
+--punching a node will result in that position being saved and inserted into a text field on the top of init form.
+local punchpos={}
+
+minetest.register_on_punchnode(function(pos, node, player, pointed_thing)
+	local pname=player:get_player_name()
+	punchpos[pname]=pos
+end)
+
+local function get_init_form(env, pname)
+	local err = env.init_err or ""
+	local code = env.init_code or ""
+	local ppos=punchpos[pname]
+	local pp=""
+	if ppos then
+		pp="POS"..minetest.pos_to_string(ppos)
+	end
+	local form = "size[10,10]button[0,0;2,1;run;Run InitCode]button[2,0;2,1;cls;Clear S]"
+		.."button[4,0;2,1;save;Save] button[6,0;2,1;del;Delete Env.] field[8.1,0.5;2,1;punchpos;Last punched position;"..pp.."]"
+		.."textarea[0.2,1;10,10;code;Environment initialization code;"..minetest.formspec_escape(code).."]"
+		.."label[0,9.8;"..err.."]"
+	return form
+end
+
+core.register_chatcommand("env_setup", {
+	params = "<environment name>",
+	description = "Set up and modify AdvTrains LuaAutomation environment",
+	privs = {atlatc=true},
+	func = function(name, param)
+		local env=atlatc.envs[param]
+		if not env then return false,"Invalid environment name!" end
+		minetest.show_formspec(name, "atlatc_envsetup_"..param, get_init_form(env, name))
+		return true
+	end,
+})
+
+core.register_chatcommand("env_create", {
+	params = "<environment name>",
+	description = "Create an AdvTrains LuaAutomation environment",
+	privs = {atlatc=true},
+	func = function(name, param)
+		if not param or param=="" then return false, "Name required!" end
+		if atlatc.envs[param] then return false, "Environment already exists!" end
+		atlatc.envs[param] = atlatc.env_new(param)
+		return true, "Created environment '"..param.."'. Use '/env_setup "..param.."' to define global initialization code, or start building LuaATC components!"
+	end,
+})
+
+
+minetest.register_on_player_receive_fields(function(player, formname, fields)
+	
+	local pname=player:get_player_name()
+	if not minetest.check_player_privs(pname, {atlatc=true}) then return end
+	
+	local envname=string.match(formname, "^atlatc_delconfirm_(.+)$")
+	if envname and fields.sure=="YES" then
+		atlatc.envs[envname]=nil
+		minetest.chat_send_player(pname, "Environment deleted!")
+		return
+	end
+	
+	envname=string.match(formname, "^atlatc_envsetup_(.+)$")
+	if not envname then return end
+	
+	local env=atlatc.envs[envname]
+	if not env then return end
+	
+	if fields.del then
+		minetest.show_formspec(pname, "atlatc_delconfirm_"..envname, "field[sure;"..minetest.formspec_escape("SURE TO DELETE ENVIRONMENT "..envname.."? Type YES (all uppercase) to continue or just quit form to cancel.")..";]")
+		return
+	end
+	
+	env.init_err=nil
+	if fields.code then
+		env.init_code=fields.code
+	end
+	if fields.run then
+		env:run_initcode()
+		minetest.show_formspec(pname, formname, get_init_form(env, pname))
+	end
+end)
diff --git a/advtrains/advtrains_luaautomation/depends.txt b/advtrains/advtrains_luaautomation/depends.txt
new file mode 100644
index 0000000..d5523e1
--- /dev/null
+++ b/advtrains/advtrains_luaautomation/depends.txt
@@ -0,0 +1,4 @@
+advtrains
+advtrains_interlocking?
+advtrains_line_automation?
+mesecons_switch?
+\ No newline at end of file
diff --git a/advtrains/advtrains_luaautomation/environment.lua b/advtrains/advtrains_luaautomation/environment.lua
new file mode 100644
index 0000000..3e7787b
--- /dev/null
+++ b/advtrains/advtrains_luaautomation/environment.lua
@@ -0,0 +1,362 @@
+-------------
+-- lua sandboxed environment
+
+-- function to cross out functions and userdata.
+-- modified from dump()
+function atlatc.remove_invalid_data(o, nested)
+	if o==nil then return nil end
+	local valid_dt={["nil"]=true, boolean=true, number=true, string=true}
+	if type(o) ~= "table" then
+		--check valid data type
+		if not valid_dt[type(o)] then
+			return nil
+		end
+		return o
+	end
+	-- Contains table -> true/nil of currently nested tables
+	nested = nested or {}
+	if nested[o] then
+		return nil
+	end
+	nested[o] = true
+	for k, v in pairs(o) do
+		v = atlatc.remove_invalid_data(v, nested)
+	end
+	nested[o] = nil
+	return o
+end
+
+
+local env_proto={
+	load = function(self, envname, data)
+		self.name=envname
+		self.sdata=data.sdata and atlatc.remove_invalid_data(data.sdata) or {}
+		self.fdata={}
+		self.init_code=data.init_code or ""
+		self.step_code=data.step_code or ""
+	end,
+	save = function(self)
+		-- throw any function values out of the sdata table
+		self.sdata = atlatc.remove_invalid_data(self.sdata)
+		return {sdata = self.sdata, init_code=self.init_code, step_code=self.step_code}
+	end,
+}
+
+--Environment
+--Code modified from mesecons_luacontroller (credit goes to Jeija and mesecons contributors)
+
+local safe_globals = {
+	"assert", "error", "ipairs", "next", "pairs", "select",
+	"tonumber", "tostring", "type", "unpack", "_VERSION"
+}
+
+--print is actually minetest.chat_send_all()
+--using advtrains.print_concat_table because it's cool
+local function safe_print(t, ...)
+	local str=advtrains.print_concat_table({t, ...})
+	minetest.log("action", "[atlatc] "..str)
+	minetest.chat_send_all(str)
+end
+
+local function safe_date(f, t)
+	if not f then
+		-- fall back to old behavior
+		return(os.date("*t",os.time()))
+	else
+		--pass parameters
+		return os.date(f,t)
+	end
+end
+
+-- string.rep(str, n) with a high value for n can be used to DoS
+-- the server. Therefore, limit max. length of generated string.
+local function safe_string_rep(str, n)
+	if #str * n > 2000 then
+		debug.sethook() -- Clear hook
+		error("string.rep: string length overflow", 2)
+	end
+
+	return string.rep(str, n)
+end
+
+-- string.find with a pattern can be used to DoS the server.
+-- Therefore, limit string.find to patternless matching.
+-- Note: Disabled security since there are enough security leaks and this would be unneccessary anyway to DoS the server
+local function safe_string_find(...)
+	--if (select(4, ...)) ~= true then
+	--	debug.sethook() -- Clear hook
+	--	error("string.find: 'plain' (fourth parameter) must always be true for security reasons.")
+	--end
+
+	return string.find(...)
+end
+
+local mp=minetest.get_modpath("advtrains_luaautomation")
+
+local static_env = {
+	--core LUA functions
+	print = safe_print,
+	string = {
+		byte = string.byte,
+		char = string.char,
+		format = string.format,
+		len = string.len,
+		lower = string.lower,
+		upper = string.upper,
+		rep = safe_string_rep,
+		reverse = string.reverse,
+		sub = string.sub,
+		find = safe_string_find,
+	},
+	math = {
+		abs = math.abs,
+		acos = math.acos,
+		asin = math.asin,
+		atan = math.atan,
+		atan2 = math.atan2,
+		ceil = math.ceil,
+		cos = math.cos,
+		cosh = math.cosh,
+		deg = math.deg,
+		exp = math.exp,
+		floor = math.floor,
+		fmod = math.fmod,
+		frexp = math.frexp,
+		huge = math.huge,
+		ldexp = math.ldexp,
+		log = math.log,
+		log10 = math.log10,
+		max = math.max,
+		min = math.min,
+		modf = math.modf,
+		pi = math.pi,
+		pow = math.pow,
+		rad = math.rad,
+		random = math.random,
+		sin = math.sin,
+		sinh = math.sinh,
+		sqrt = math.sqrt,
+		tan = math.tan,
+		tanh = math.tanh,
+	},
+	table = {
+		concat = table.concat,
+		insert = table.insert,
+		maxn = table.maxn,
+		remove = table.remove,
+		sort = table.sort,
+	},
+	os = {
+		clock = os.clock,
+		difftime = os.difftime,
+		time = os.time,
+		date = safe_date,
+	},
+	POS = function(x,y,z) return {x=x, y=y, z=z} end,
+	getstate = advtrains.getstate,
+	setstate = advtrains.setstate,
+	is_passive = advtrains.is_passive,
+	--interrupts are handled per node, position unknown. (same goes for digilines)
+	--however external interrupts can be set here.
+	interrupt_pos = function(parpos, imesg)
+		local pos=atlatc.pcnaming.resolve_pos(parpos)
+		atlatc.interrupt.add(0, pos, {type="ext_int", ext_int=true, message=imesg})
+	end,
+}
+
+-- If interlocking is present, enable route setting functions
+if advtrains.interlocking then
+	local function gen_checks(signal, route_name, noroutesearch)
+		assertt(route_name, "string")
+		local pos = atlatc.pcnaming.resolve_pos(signal)
+		local sigd = advtrains.interlocking.db.get_sigd_for_signal(pos)
+		if not sigd then
+			error("There's no signal at "..minetest.pos_to_string(pos))
+		end
+		local tcbs = advtrains.interlocking.db.get_tcbs(sigd)
+		if not tcbs then
+			error("Inconsistent configuration, no tcbs for signal at "..minetest.pos_to_string(pos))
+		end
+		
+		local routeid, route
+		if not noroutesearch then
+			for routeidt, routet in ipairs(tcbs.routes) do
+				if routet.name == route_name then
+					routeid = routeidt
+					route = routet
+					break
+				end
+			end
+			if not route then
+				error("No route called "..route_name.." at "..minetest.pos_to_string(pos))
+			end
+		end
+		return pos, sigd, tcbs, routeid, route
+	end
+
+
+	static_env.can_set_route = function(signal, route_name)
+		local pos, sigd, tcbs, routeid, route = gen_checks(signal, route_name)
+		-- if route is already set on signal, return whether it's committed
+		if tcbs.routeset == routeid then
+			return tcbs.route_committed
+		end
+		-- actually try setting route (parameter 'true' designates try-run
+		local ok = advtrains.interlocking.route.set_route(sigd, route, true)
+		return ok
+	end
+	static_env.set_route = function(signal, route_name)
+		local pos, sigd, tcbs, routeid, route = gen_checks(signal, route_name)
+		return advtrains.interlocking.route.update_route(sigd, tcbs, routeid)
+	end
+	static_env.cancel_route = function(signal)
+		local pos, sigd, tcbs, routeid, route = gen_checks(signal, "", true)
+		return advtrains.interlocking.route.update_route(sigd, tcbs, nil, true)
+	end
+	static_env.get_aspect = function(signal)
+		local pos = atlatc.pcnaming.resolve_pos(signal)
+		return advtrains.interlocking.signal_get_aspect(pos)
+	end
+	static_env.set_aspect = function(signal, asp)
+		local pos = atlatc.pcnaming.resolve_pos(signal)
+		return advtrains.interlocking.signal_set_aspect(pos)
+	end
+end
+
+-- Lines-specific:
+if advtrains.lines then
+	local atlrwt = advtrains.lines.rwt
+	static_env.rwt = {
+		now = atlrwt.now,
+		new = atlrwt.new,
+		copy = atlrwt.copy,
+		to_table = atlrwt.to_table,
+		to_secs = atlrwt.to_secs,
+		to_string = atlrwt.to_string,
+		add = atlrwt.add,
+		diff = atlrwt.diff,
+		sub = atlrwt.sub,
+		adj_diff = atlrwt.adj_diff,
+		adjust_cycle = atlrwt.adjust_cycle,
+		adjust = atlrwt.adjust,
+		to_string = atlrwt.to_string,
+		get_time_until = atlrwt.get_time_until,
+		next_rpt = atlrwt.next_rpt,
+		last_rpt = atlrwt.last_rpt,
+		time_from_last_rpt = atlrwt.time_from_last_rpt,
+		time_to_next_rpt = atlrwt.time_to_next_rpt,
+	}
+end
+
+for _, name in pairs(safe_globals) do
+	static_env[name] = _G[name]
+end
+
+
+--The environment all code calls get is a table that has set static_env as metatable.
+--In general, every variable is local to a single code chunk, but kept persistent over code re-runs. Data is also saved, but functions and userdata and circular references are removed
+--Init code and step code's environments are not saved
+-- S - Table that can contain any save data global to the environment. Will be saved statically. Can't contain functions or userdata or circular references.
+-- F - Table global to the environment, can contain volatile data that is deleted when server quits.
+--     The init code should populate this table with functions and other definitions.
+
+local proxy_env={}
+--proxy_env gets a new metatable in every run, but is the shared environment of all functions ever defined.
+
+-- returns: true, fenv if successful; nil, error if error 
+function env_proto:execute_code(localenv, code, evtdata, customfct)
+	local metatbl ={
+		__index = function(t, i)
+			if i=="S" then
+				return self.sdata
+			elseif i=="F" then
+				return self.fdata
+			elseif i=="event" then
+				return evtdata
+			elseif customfct and customfct[i] then
+				return customfct[i]
+			elseif localenv and localenv[i] then
+				return localenv[i]
+			end
+			return static_env[i]
+		end,
+		__newindex = function(t, i, v)
+			if i=="S" or i=="F" or i=="event" or (customfct and customfct[i]) or static_env[i] then
+				debug.sethook()
+				error("Trying to overwrite environment contents")
+			end
+			localenv[i]=v
+		end,
+	}
+	setmetatable(proxy_env, metatbl)
+	local fun, err=loadstring(code)
+	if not fun then
+		return false, err
+	end
+	
+	setfenv(fun, proxy_env)
+	local succ, data = pcall(fun)
+	if succ then
+		data=localenv
+	end
+	return succ, data
+end
+
+function env_proto:run_initcode()
+	if self.init_code and self.init_code~="" then
+		local old_fdata=self.fdata
+		self.fdata = {}
+		atprint("[atlatc]Running initialization code for environment '"..self.name.."'")
+		local succ, err = self:execute_code({}, self.init_code, {type="init", init=true})
+		if not succ then
+			atwarn("[atlatc]Executing InitCode for '"..self.name.."' failed:"..err)
+			self.init_err=err
+			if old_fdata then
+				self.fdata=old_fdata
+				atwarn("[atlatc]The 'F' table has been restored to the previous state.")
+			end
+		end
+	end
+end
+function env_proto:run_stepcode()
+	if self.step_code and self.step_code~="" then
+		local succ, err = self:execute_code({}, self.step_code, nil, {})
+		if not succ then
+			--TODO
+		end
+	end
+end
+
+--- class interface
+
+function atlatc.env_new(name)
+	local newenv={
+		name=name,
+		init_code="",
+		step_code="",
+		sdata={}
+	}
+	setmetatable(newenv, {__index=env_proto})
+	return newenv
+end
+function atlatc.env_load(name, data)
+	local newenv={}
+	setmetatable(newenv, {__index=env_proto})
+	newenv:load(name, data)
+	return newenv
+end
+
+function atlatc.run_initcode()
+	for envname, env in pairs(atlatc.envs) do
+		env:run_initcode()
+	end
+end
+function atlatc.run_stepcode()
+	for envname, env in pairs(atlatc.envs) do
+		env:run_stepcode()
+	end
+end
+
+
+
+
diff --git a/advtrains/advtrains_luaautomation/init.lua b/advtrains/advtrains_luaautomation/init.lua
new file mode 100644
index 0000000..eca5633
--- /dev/null
+++ b/advtrains/advtrains_luaautomation/init.lua
@@ -0,0 +1,109 @@
+-- advtrains_luaautomation/init.lua
+-- Lua automation features for advtrains
+-- Uses global table 'atlatc' (AdvTrains_LuaATC)
+
+-- Boilerplate to support localized strings if intllib mod is installed.
+if intllib then
+    atltrans = intllib.Getter()
+else
+    atltrans = function(s,a,...)a={a,...}return s:gsub("@(%d+)",function(n)return a[tonumber(n)]end)end
+end
+
+--Privilege
+--Only trusted players should be enabled to build stuff which can break the server.
+
+atlatc = { envs = {}}
+
+minetest.register_privilege("atlatc", { description = "Player can place and modify LUA ATC components. Grant with care! Allows to execute bad LUA code.", give_to_singleplayer = false, default= false })
+
+--assertt helper. error if a variable is not of a type
+function assertt(var, typ)
+	if type(var)~=typ then
+		error("Assertion failed, variable has to be of type "..typ)
+	end
+end
+
+local mp=minetest.get_modpath("advtrains_luaautomation")
+if not mp then
+	error("Mod name error: Mod folder is not named 'advtrains_luaautomation'!")
+end
+dofile(mp.."/environment.lua")
+dofile(mp.."/interrupt.lua")
+dofile(mp.."/active_common.lua")
+dofile(mp.."/atc_rail.lua")
+dofile(mp.."/operation_panel.lua")
+dofile(mp.."/pcnaming.lua")
+
+dofile(mp.."/chatcmds.lua")
+
+
+local filename=minetest.get_worldpath().."/advtrains_luaautomation"
+
+function atlatc.load()
+	local file, err = io.open(filename, "r")
+	if not file then
+		minetest.log("warning", " Failed to read advtrains_luaautomation save data from file "..filename..": "..(err or "Unknown Error"))
+		minetest.log("warning", " (this is normal when first enabling advtrains on this world)")
+	else
+		atprint("luaautomation reading file:",filename)
+		local tbl = minetest.deserialize(file:read("*a"))
+		if type(tbl) == "table" then
+			if tbl.version==1 then
+				for envname, data in pairs(tbl.envs) do
+					atlatc.envs[envname]=atlatc.env_load(envname, data)
+				end
+				atlatc.active.load(tbl.active)
+				atlatc.interrupt.load(tbl.interrupt)
+				atlatc.pcnaming.load(tbl.pcnaming)
+			end
+		else
+			minetest.log("error", " Failed to read advtrains_luaautomation save data from file "..filename..": Not a table!")
+		end
+		file:close()
+	end
+	-- run init code of all environments
+	atlatc.run_initcode()
+end
+
+
+atlatc.save = function()
+	--versions:
+	-- 1 - Initial save format.
+	
+	local envdata={}
+	for envname, env in pairs(atlatc.envs) do
+		envdata[envname]=env:save()
+	end
+	local save_tbl={
+		version = 1,
+		envs=envdata,
+		active = atlatc.active.save(),
+		interrupt = atlatc.interrupt.save(),
+		pcnaming = atlatc.pcnaming.save(),
+	}
+	
+	local datastr = minetest.serialize(save_tbl)
+	if not datastr then
+		minetest.log("error", " Failed to save advtrains_luaautomation save data to file "..filename..": Can't serialize!")
+		return
+	end
+	local file, err = io.open(filename, "w")
+	if err then
+		minetest.log("error", " Failed to save advtrains_luaautomation save data to file "..filename..": "..(err or "Unknown Error"))
+		return
+	end
+	file:write(datastr)
+	file:close()
+end
+
+
+-- globalstep for step code
+local timer, step_int=0, 2
+
+function atlatc.mainloop_stepcode(dtime)
+	timer=timer+dtime
+	if timer>step_int then
+		timer=0
+		atlatc.run_stepcode()
+	end
+end
diff --git a/advtrains/advtrains_luaautomation/interrupt.lua b/advtrains/advtrains_luaautomation/interrupt.lua
new file mode 100644
index 0000000..525c3b4
--- /dev/null
+++ b/advtrains/advtrains_luaautomation/interrupt.lua
@@ -0,0 +1,48 @@
+-- interrupt.lua
+-- implements interrupt queue
+
+--to be saved: pos and evtdata
+local iq={}
+local queue={}
+local timer=0
+local run=false
+
+function iq.load(data)
+	local d=data or {}
+	queue = d.queue or {}
+	timer = d.timer or 0
+end
+function iq.save()
+	return {queue = queue, timer=timer}
+end
+
+function iq.add(t, pos, evtdata)
+	queue[#queue+1]={t=t+timer, p=pos, e=evtdata}
+	run=true
+end
+
+function iq.mainloop(dtime)
+	timer=timer + math.min(dtime, 0.2)
+	for i=1,#queue do
+		local qe=queue[i]
+		if not qe then
+			table.remove(queue, i)
+			i=i-1
+		elseif timer>qe.t then
+			local pos, evtdata=queue[i].p, queue[i].e
+			local node=advtrains.ndb.get_node(pos)
+			local ndef=minetest.registered_nodes[node.name]
+			if ndef and ndef.luaautomation and ndef.luaautomation.fire_event then
+				ndef.luaautomation.fire_event(pos, evtdata)
+			else
+				atwarn("[atlatc][interrupt] Couldn't run event",evtdata.type,"on",pos,", something wrong with the node",node)
+			end
+			table.remove(queue, i)
+			i=i-1
+		end
+	end
+end
+
+
+
+atlatc.interrupt=iq
diff --git a/advtrains/advtrains_luaautomation/operation_panel.lua b/advtrains/advtrains_luaautomation/operation_panel.lua
new file mode 100644
index 0000000..f8b93b5
--- /dev/null
+++ b/advtrains/advtrains_luaautomation/operation_panel.lua
@@ -0,0 +1,28 @@
+
+local function on_punch(pos, player)
+	atlatc.interrupt.add(0, pos, {type="punch", punch=true})
+end
+
+
+minetest.register_node("advtrains_luaautomation:oppanel", {
+	drawtype = "normal",
+	tiles={"atlatc_oppanel.png"},
+	description = "LuaAutomation operation panel",
+	groups = {
+		cracky = 1,
+		save_in_at_nodedb=1,
+	},
+	after_place_node = atlatc.active.after_place_node,
+	after_dig_node = atlatc.active.after_dig_node,
+	on_receive_fields = atlatc.active.on_receive_fields,
+	on_punch = on_punch,
+	luaautomation = {
+		fire_event=atlatc.active.run_in_env
+	},
+	digiline = {
+		receptor = {},
+		effector = {
+			action = atlatc.active.on_digiline_receive
+		},
+	},
+})
diff --git a/advtrains/advtrains_luaautomation/p_display.lua b/advtrains/advtrains_luaautomation/p_display.lua
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/advtrains/advtrains_luaautomation/p_display.lua
diff --git a/advtrains/advtrains_luaautomation/passive_api.txt b/advtrains/advtrains_luaautomation/passive_api.txt
new file mode 100644
index 0000000..9852e94
--- /dev/null
+++ b/advtrains/advtrains_luaautomation/passive_api.txt
@@ -0,0 +1,24 @@
+Lua Automation - Passive Component API
+
+Passive components are nodes that do not have code running in them. However, active components can query these and request actions from them. Examples:
+Switches
+Signals
+Displays
+Mesecon Transmitter
+Those passive components can also be used inside interlocking systems.
+
+All passive components have a table called 'advtrains' in their node definition and have the group 'save_in_nodedb' set, so they work in unloaded chunks.
+Example for a switch:
+advtrains = {
+	getstate = function(pos, node)
+		return "st"
+	end,
+	-- OR
+	getstate = "st",
+
+	setstate = function(pos, node, newstate)
+		if newstate=="cr" then
+			advtrains.ndb.swap_node(pos, <corresponding switch alt>)
+		end
+	end
+}
+\ No newline at end of file
diff --git a/advtrains/advtrains_luaautomation/pcnaming.lua b/advtrains/advtrains_luaautomation/pcnaming.lua
new file mode 100644
index 0000000..ebb769f
--- /dev/null
+++ b/advtrains/advtrains_luaautomation/pcnaming.lua
@@ -0,0 +1,76 @@
+--pcnaming.lua
+--a.k.a Passive component naming
+--Allows to assign names to passive components, so they can be called like:
+--setstate("iamasignal", "green")
+atlatc.pcnaming={name_map={}}
+function atlatc.pcnaming.load(stuff)
+	if type(stuff)=="table" then
+		atlatc.pcnaming.name_map=stuff
+	end
+end
+function atlatc.pcnaming.save()
+	return atlatc.pcnaming.name_map
+end
+
+function atlatc.pcnaming.resolve_pos(pos, func_name)
+	if type(pos)=="string" then
+		local e = atlatc.pcnaming.name_map[pos]
+		if e then return e end
+	elseif type(pos)=="table" and pos.x and pos.y and pos.z then
+		return pos
+	end
+	error("Invalid position supplied to " .. (func_name or "???")..": " .. dump(pos))
+end
+
+minetest.register_craftitem("advtrains_luaautomation:pcnaming",{
+	description = attrans("Passive Component Naming Tool\n\nRight-click to name a passive component."),
+	groups = {cracky=1}, -- key=name, value=rating; rating=1..3.
+	inventory_image = "atlatc_pcnaming.png",
+	wield_image = "atlatc_pcnaming.png",
+	stack_max = 1,
+	on_place = function(itemstack, placer, pointed_thing)
+		local pname = placer:get_player_name()
+		if not pname then
+			return
+		end
+		if not minetest.check_player_privs(pname, {atlatc=true}) then
+			minetest.chat_send_player(pname, "Missing privilege: atlatc")
+			return
+		end
+		if pointed_thing.type=="node" then
+			local pos=pointed_thing.under
+			if advtrains.is_protected(pos, pname) then
+				minetest.record_protection_violation(pos, pname)
+				return
+			end
+			local node = advtrains.ndb.get_node(pos)
+			if node.name and (minetest.get_item_group(node.name, "advtrains_signal")>0 or advtrains.is_passive(pos)) then
+				--look if this one already has a name
+				local pn=""
+				for name, npos in pairs(atlatc.pcnaming.name_map) do
+					if vector.equals(npos, pos) then
+						pn=name
+					end
+				end
+				minetest.show_formspec(pname, "atlatc_naming_"..minetest.pos_to_string(pos), "field[pn;Set name of component (empty to clear);"..minetest.formspec_escape(pn).."]")
+			end
+		end
+	end,
+})
+minetest.register_on_player_receive_fields(function(player, formname, fields)
+	local pts=string.match(formname, "^atlatc_naming_(.+)")
+	if pts then
+		local pos=minetest.string_to_pos(pts)
+		if fields.pn then
+			--first remove all occurences
+			for name, npos in pairs(atlatc.pcnaming.name_map) do
+				if vector.equals(npos, pos) then
+					atlatc.pcnaming.name_map[name]=nil
+				end
+			end
+			if fields.pn~="" then
+				atlatc.pcnaming.name_map[fields.pn]=pos
+			end
+		end
+	end
+end)
diff --git a/advtrains/advtrains_luaautomation/textures/atlatc_oppanel.png b/advtrains/advtrains_luaautomation/textures/atlatc_oppanel.png
new file mode 100644
index 0000000..96eb30e
--- /dev/null
+++ b/advtrains/advtrains_luaautomation/textures/atlatc_oppanel.png
diff --git a/advtrains/advtrains_luaautomation/textures/atlatc_pcnaming.png b/advtrains/advtrains_luaautomation/textures/atlatc_pcnaming.png
new file mode 100644
index 0000000..3fccdfc
--- /dev/null
+++ b/advtrains/advtrains_luaautomation/textures/atlatc_pcnaming.png
diff --git a/advtrains/advtrains_signals_ks/depends.txt b/advtrains/advtrains_signals_ks/depends.txt
new file mode 100644
index 0000000..9ddc3eb
--- /dev/null
+++ b/advtrains/advtrains_signals_ks/depends.txt
@@ -0,0 +1,2 @@
+advtrains
+advtrains_interlocking
+\ No newline at end of file
diff --git a/advtrains/advtrains_signals_ks/init.lua b/advtrains/advtrains_signals_ks/init.lua
new file mode 100644
index 0000000..c65d5f8
--- /dev/null
+++ b/advtrains/advtrains_signals_ks/init.lua
@@ -0,0 +1,255 @@
+-- Ks signals
+-- Can display main aspects (no Zs) + Sht
+
+-- 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 setaspectf = function(rot)
+ return function(pos, node, asp)
+	if not asp.main.free then
+		if asp.shunt.free 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
+	else
+		if asp.dst.free and asp.main.speed == -1 then
+			advtrains.ndb.swap_node(pos, {name="advtrains_signals_ks:hs_free_"..rot, param2 = node.param2})
+		else
+			advtrains.ndb.swap_node(pos, {name="advtrains_signals_ks:hs_slow_"..rot, param2 = node.param2})
+		end
+	end
+ end
+end
+
+local suppasp = {
+		main = {
+			free = nil,
+			speed = {6, -1},
+		},
+		dst = {
+			free = nil,
+			speed = nil,
+		},
+		shunt = {
+			free = nil,
+			proceed_as_main = true,
+		},
+		info = {
+			call_on = false,
+			dead_end = false,
+			w_speed = nil,
+		}
+}
+
+--Rangiersignal
+local setaspectf_ra = function(rot)
+ return function(pos, node, asp)
+	if asp.shunt.free then
+		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 = {
+			free = true,
+		},
+		dst = {
+			free = nil,
+			speed = nil,
+		},
+		shunt = {
+			free = nil,
+			proceed_as_main = false,
+		},
+		info = {
+			call_on = false,
+			dead_end = false,
+			w_speed = nil,
+		}
+}
+
+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: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},},
+	}) do
+	local rot = rtab.rot
+	for typ, prts in pairs({
+			danger = {asp = advtrains.interlocking.DANGER, n = "slow", ici=true},
+			slow   = {asp = { main = { free = true, speed = 6 }, shunt = {proceed_as_main = true}} , n = "free"},
+			free   = {asp = { main = { free = true, speed = -1 }, shunt = {proceed_as_main = true}} , n = "shunt"},
+			shunt  = {asp = { main = {free = false}, shunt = {free = true} } , n = "danger"},
+		}) do
+		minetest.register_node("advtrains_signals_ks:hs_"..typ.."_"..rot, {
+			description = "Ks Main Signal",
+			drawtype = "mesh",
+			mesh = "advtrains_signals_ks_main_smr"..rot..".obj",
+			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,
+			
+			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:hs_danger_0",
+			inventory_image = "advtrains_signals_ks_hs_inv.png",
+			sounds = default.node_sound_stone_defaults(),
+			advtrains = {
+				set_aspect = setaspectf(rot),
+				supported_aspects = suppasp,
+				get_aspect = function(pos, node)
+					return prts.asp
+				end,
+			},
+			on_rightclick = advtrains.interlocking.signal_rc_handler,
+			can_dig = advtrains.interlocking.signal_can_dig,
+		})
+		-- rotatable by trackworker
+		advtrains.trackplacer.add_worked("advtrains_signals_ks:hs", typ, "_"..rot, prts.n)
+	end
+	
+	
+	--Rangiersignale:
+	for typ, prts in pairs({
+			danger = {asp = { main = {free = true}, shunt = {free = false} }, n = "shuntd", ici=true},
+			shuntd = {asp = { main = {free = true}, shunt = {free = true} } , n = "danger"},
+		}) do
+		minetest.register_node("advtrains_signals_ks:ra_"..typ.."_"..rot, {
+			description = "Ks Shunting Signal",
+			drawtype = "mesh",
+			mesh = "advtrains_signals_ks_sht_smr"..rot..".obj",
+			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,
+			
+			paramtype2 = "facedir",
+			selection_box = {
+				type = "fixed",
+				fixed = {-1/4, -1/2, -1/4, 1/4, 0, 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:ra_danger_0",
+			inventory_image = "advtrains_signals_ks_ra_inv.png",
+			sounds = default.node_sound_stone_defaults(),
+			advtrains = {
+				set_aspect = setaspectf_ra(rot),
+				supported_aspects = suppasp_ra,
+				get_aspect = function(pos, node)
+					return prts.asp
+				end,
+			},
+			on_rightclick = advtrains.interlocking.signal_rc_handler,
+			can_dig = advtrains.interlocking.signal_can_dig,
+		})
+		-- rotatable by trackworker
+		advtrains.trackplacer.add_worked("advtrains_signals_ks:ra", typ, "_"..rot, prts.n)
+	end
+	
+	--Schilder:
+	for typ, prts in pairs({
+			-- Speed restrictions:
+			["8"] = {asp = { main = {free = true, speed = 8}, shunt = {free = true} }, n = "12", ici=true},
+			["12"] = {asp = { main = {free = true, speed = 12}, shunt = {free = true} }, n = "16"},
+			["16"] = {asp = { main = {free = true, speed = 16}, shunt = {free = true} }, n = "e"},
+			-- Speed restriction lifted
+			["e"] = {asp = { main = {free = true, speed = -1}, shunt = {free = true} }, n = "hfs"},
+			-- Halt for shunt moves:
+			["hfs"] = {asp = { main = {free = true}, shunt = {free = false} }, n = "8"},
+		}) do
+		minetest.register_node("advtrains_signals_ks:sign_"..typ.."_"..rot, {
+			description = "Signal Sign",
+			drawtype = "mesh",
+			mesh = "advtrains_signals_ks_sign_smr"..rot..".obj",
+			tiles = {"advtrains_signals_ks_signpost.png", "advtrains_signals_ks_sign_"..typ..".png"},
+			
+			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:sign_e_0",
+			inventory_image = "advtrains_signals_ks_sign_8.png",
+			sounds = default.node_sound_stone_defaults(),
+			advtrains = {
+				-- This is a static signal! No set_aspect
+				get_aspect = function(pos, node)
+					return prts.asp
+				end,
+			},
+			on_rightclick = advtrains.interlocking.signal_rc_handler,
+			can_dig = advtrains.interlocking.signal_can_dig,
+		})
+		-- rotatable by trackworker
+		advtrains.trackplacer.add_worked("advtrains_signals_ks:sign", typ, "_"..rot, prts.n)
+	end
+	
+	minetest.register_node("advtrains_signals_ks:mast_mast_"..rot, {
+		description = "Ks Mast",
+		drawtype = "mesh",
+		mesh = "advtrains_signals_ks_mast_smr"..rot..".obj",
+		tiles = {"advtrains_signals_ks_mast.png"},
+		
+		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,
+			not_blocking_trains = 1,
+			not_in_creative_inventory = (rtab.ici) and 0 or 1,
+		},
+		drop = "advtrains_signals_ks:mast_mast_0",
+		sounds = default.node_sound_stone_defaults(),
+	})
+	advtrains.trackplacer.add_worked("advtrains_signals_ks:mast","mast", "_"..rot)
+end
+
diff --git a/advtrains/advtrains_signals_ks/init_degrotate_nodes.lua b/advtrains/advtrains_signals_ks/init_degrotate_nodes.lua
new file mode 100644
index 0000000..a4380d2
--- /dev/null
+++ b/advtrains/advtrains_signals_ks/init_degrotate_nodes.lua
@@ -0,0 +1,94 @@
+-- Ks Signals for advtrains
+-- will implement the advtrains signal API (which does not exist yet)
+
+local function place_degrotate(pos, placer, itemstack, pointed_thing)
+	local yaw = placer:get_look_horizontal()
+	local param = math.floor(yaw * 90 / math.pi + 0.5)
+	local n = minetest.get_node(pos)
+	n.param2 = param
+	minetest.set_node(pos, n)
+end
+
+minetest.register_node("advtrains_signals_ks:mast", {
+	drawtype = "mesh",
+	paramtype="light",
+	paramtype2="degrotate",
+	walkable = false,
+	selection_box = {
+		type = "fixed",
+		fixed = {-1/4, -1/2, -1/4, 1/4, 1/2, 1/4},
+	},
+	mesh = "advtrains_signals_ks_mast.obj",
+	tiles = {"advtrains_signals_ks_mast.png"},
+	description="Ks Signal Mast",
+	sunlight_propagates=true,
+	groups = {
+		cracky=3,
+		not_blocking_trains=1,
+		--save_in_at_nodedb=2,
+	},
+	after_place_node = place_degrotate,
+})
+
+minetest.register_node("advtrains_signals_ks:head_main", {
+	drawtype = "mesh",
+	paramtype="light",
+	paramtype2="degrotate",
+	walkable = false,
+	selection_box = {
+		type = "fixed",
+		fixed = {-1/4, -1/2, -1/4, 1/4, 1/2, 1/4},
+	},
+	mesh = "advtrains_signals_ks_head_main.obj",
+	tiles = {"advtrains_signals_ks_mast.png", "advtrains_signals_ks_head.png"},
+	description="Ks Main Signal Screen",
+	sunlight_propagates=true,
+	groups = {
+		cracky=3,
+		not_blocking_trains=1,
+		--save_in_at_nodedb=2,
+	},
+	after_place_node = place_degrotate,
+})
+
+minetest.register_node("advtrains_signals_ks:zs_top", {
+	drawtype = "mesh",
+	paramtype="light",
+	paramtype2="degrotate",
+	walkable = false,
+	selection_box = {
+		type = "fixed",
+		fixed = {-1/4, -1/2, -1/4, 1/4, 1/2, 1/4},
+	},
+	mesh = "advtrains_signals_ks_zs_top.obj",
+	tiles = {"advtrains_signals_ks_mast.png", "advtrains_signals_ks_head.png"},
+	description="Ks Speed Restriction Signal (top)",
+	sunlight_propagates=true,
+	groups = {
+		cracky=3,
+		not_blocking_trains=1,
+		--save_in_at_nodedb=2,
+	},
+	after_place_node = place_degrotate,
+})
+
+minetest.register_node("advtrains_signals_ks:zs_bottom", {
+	drawtype = "mesh",
+	paramtype="light",
+	paramtype2="degrotate",
+	walkable = false,
+	selection_box = {
+		type = "fixed",
+		fixed = {-1/4, -1/2, -1/4, 1/4, 1/2, 1/4},
+	},
+	mesh = "advtrains_signals_ks_zs_bottom.obj",
+	tiles = {"advtrains_signals_ks_mast.png", "advtrains_signals_ks_head.png"},
+	description="Ks Speed Restriction Signal (bottom)",
+	sunlight_propagates=true,
+	groups = {
+		cracky=3,
+		not_blocking_trains=1,
+		--save_in_at_nodedb=2,
+	},
+	after_place_node = place_degrotate,
+})
diff --git a/advtrains/advtrains_signals_ks/models/advtrains_signals_ks_head_dist.obj b/advtrains/advtrains_signals_ks/models/advtrains_signals_ks_head_dist.obj
new file mode 100644
index 0000000..28399e1
--- /dev/null
+++ b/advtrains/advtrains_signals_ks/models/advtrains_signals_ks_head_dist.obj
@@ -0,0 +1,270 @@
+# Blender v2.76 (sub 0) OBJ File: 'signal_ks_export.blend'
+# www.blender.org
+mtllib advtrains_signals_ks_head_dist.mtl
+o VSSignalschirm_Cube.003
+v 0.028581 -0.498051 0.268412
+v -0.028581 -0.498051 0.268412
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+usemtl Mast
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diff --git a/advtrains/advtrains_signals_ks/models/advtrains_signals_ks_head_main.obj b/advtrains/advtrains_signals_ks/models/advtrains_signals_ks_head_main.obj
new file mode 100644
index 0000000..283ef46
--- /dev/null
+++ b/advtrains/advtrains_signals_ks/models/advtrains_signals_ks_head_main.obj
@@ -0,0 +1,286 @@
+# Blender v2.76 (sub 0) OBJ File: 'signal_ks_export.blend'
+# www.blender.org
+mtllib advtrains_signals_ks_head_main.mtl
+o HSSignalschirm_Cube.002
+v -0.028581 -0.498051 0.439611
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diff --git a/advtrains/advtrains_signals_ks/models/advtrains_signals_ks_lamps_dist.obj b/advtrains/advtrains_signals_ks/models/advtrains_signals_ks_lamps_dist.obj
new file mode 100644
index 0000000..c4f8a61
--- /dev/null
+++ b/advtrains/advtrains_signals_ks/models/advtrains_signals_ks_lamps_dist.obj
@@ -0,0 +1,1989 @@
+# Blender v2.76 (sub 0) OBJ File: 'signal_ks_export.blend'
+# www.blender.org
+mtllib advtrains_signals_ks_lamps_dist.mtl
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diff --git a/advtrains/advtrains_signals_ks/models/advtrains_signals_ks_lamps_main.obj b/advtrains/advtrains_signals_ks/models/advtrains_signals_ks_lamps_main.obj
new file mode 100644
index 0000000..4949466
--- /dev/null
+++ b/advtrains/advtrains_signals_ks/models/advtrains_signals_ks_lamps_main.obj
@@ -0,0 +1,2719 @@
+# Blender v2.76 (sub 0) OBJ File: 'signal_ks_export.blend'
+# www.blender.org
+mtllib advtrains_signals_ks_lamps_main.mtl
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diff --git a/advtrains/advtrains_signals_ks/models/advtrains_signals_ks_main_smr0.obj b/advtrains/advtrains_signals_ks/models/advtrains_signals_ks_main_smr0.obj
new file mode 100644
index 0000000..eb6d468
--- /dev/null
+++ b/advtrains/advtrains_signals_ks/models/advtrains_signals_ks_main_smr0.obj
@@ -0,0 +1,4280 @@
+# Blender v2.79 (sub 0) OBJ File: 'signal_ks_singlemesh_final.blend'
+# www.blender.org
+mtllib advtrains_signals_ks_main_smr0.mtl
+o KsHauptsignal_Plane.006
+v 0.028888 -0.503378 -0.439591
+v -0.028274 -0.503378 -0.439631
+v -0.028235 -0.503378 -0.496794
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diff --git a/advtrains/advtrains_signals_ks/models/advtrains_signals_ks_main_smr30.obj b/advtrains/advtrains_signals_ks/models/advtrains_signals_ks_main_smr30.obj
new file mode 100644
index 0000000..e75292f
--- /dev/null
+++ b/advtrains/advtrains_signals_ks/models/advtrains_signals_ks_main_smr30.obj
@@ -0,0 +1,4293 @@
+# Blender v2.79 (sub 0) OBJ File: 'signal_ks_singlemesh_final.blend'
+# www.blender.org
+mtllib advtrains_signals_ks_main_smr30.mtl
+o KsHauptsignal_Plane.006
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+g KsHauptsignal_Plane.006_Lampenrahmen
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diff --git a/advtrains/advtrains_signals_ks/models/advtrains_signals_ks_main_smr45.obj b/advtrains/advtrains_signals_ks/models/advtrains_signals_ks_main_smr45.obj
new file mode 100644
index 0000000..50ded48
--- /dev/null
+++ b/advtrains/advtrains_signals_ks/models/advtrains_signals_ks_main_smr45.obj
@@ -0,0 +1,4301 @@
+# Blender v2.79 (sub 0) OBJ File: 'signal_ks_singlemesh_final.blend'
+# www.blender.org
+mtllib advtrains_signals_ks_main_smr45.mtl
+o KsHauptsignal_Plane.006
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+g KsHauptsignal_Plane.006_Lampenrahmen
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diff --git a/advtrains/advtrains_signals_ks/models/advtrains_signals_ks_main_smr60.obj b/advtrains/advtrains_signals_ks/models/advtrains_signals_ks_main_smr60.obj
new file mode 100644
index 0000000..81d5006
--- /dev/null
+++ b/advtrains/advtrains_signals_ks/models/advtrains_signals_ks_main_smr60.obj
@@ -0,0 +1,4310 @@
+# Blender v2.79 (sub 0) OBJ File: 'signal_ks_singlemesh_final.blend'
+# www.blender.org
+mtllib advtrains_signals_ks_main_smr60.mtl
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