Add interlocking guide/manual, silence debug outputs

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diff --git a/assets/interlocking.html.LyXconv/1_home_moritz_Home_Projekte_Minetest_minetest_m____lyx_img_Bildschirmfoto_2018-08-30_14-26-35.png b/assets/interlocking.html.LyXconv/1_home_moritz_Home_Projekte_Minetest_minetest_m____lyx_img_Bildschirmfoto_2018-08-30_14-26-35.png
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diff --git a/assets/interlocking.html.LyXconv/2_home_moritz_Home_Projekte_Minetest_minetest_m____lyx_img_Bildschirmfoto_2018-08-30_14-32-48.png b/assets/interlocking.html.LyXconv/2_home_moritz_Home_Projekte_Minetest_minetest_m____lyx_img_Bildschirmfoto_2018-08-30_14-32-48.png
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diff --git a/assets/interlocking.html.LyXconv/3_home_moritz_Home_Projekte_Minetest_minetest_m____lyx_img_Bildschirmfoto_2018-08-30_14-27-25.png b/assets/interlocking.html.LyXconv/3_home_moritz_Home_Projekte_Minetest_minetest_m____lyx_img_Bildschirmfoto_2018-08-30_14-27-25.png
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diff --git a/assets/interlocking.html.LyXconv/4_home_moritz_Home_Projekte_Minetest_minetest_m____lyx_img_Bildschirmfoto_2018-08-30_14-28-32.png b/assets/interlocking.html.LyXconv/4_home_moritz_Home_Projekte_Minetest_minetest_m____lyx_img_Bildschirmfoto_2018-08-30_14-28-32.png
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diff --git a/assets/interlocking.html.LyXconv/5_home_moritz_Home_Projekte_Minetest_minetest_m____lyx_img_Bildschirmfoto_2018-08-30_14-51-25.png b/assets/interlocking.html.LyXconv/5_home_moritz_Home_Projekte_Minetest_minetest_m____lyx_img_Bildschirmfoto_2018-08-30_14-51-25.png
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diff --git a/assets/interlocking.html.LyXconv/6_home_moritz_Home_Projekte_Minetest_minetest_mods_advtrains_assets_lyx_img_assign_signal.png b/assets/interlocking.html.LyXconv/6_home_moritz_Home_Projekte_Minetest_minetest_mods_advtrains_assets_lyx_img_assign_signal.png
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diff --git a/assets/interlocking.html.LyXconv/7_home_moritz_Home_Projekte_Minetest_minetest_mods_advtrains_assets_lyx_img_route_ex1.png b/assets/interlocking.html.LyXconv/7_home_moritz_Home_Projekte_Minetest_minetest_mods_advtrains_assets_lyx_img_route_ex1.png
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diff --git a/assets/interlocking.html.LyXconv/8_home_moritz_Home_Projekte_Minetest_minetest_mods_advtrains_assets_lyx_img_route_ex2.png b/assets/interlocking.html.LyXconv/8_home_moritz_Home_Projekte_Minetest_minetest_mods_advtrains_assets_lyx_img_route_ex2.png
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diff --git a/assets/interlocking.html.LyXconv/9_home_moritz_Home_Projekte_Minetest_minetest_mods_advtrains_assets_lyx_img_route_ex3.png b/assets/interlocking.html.LyXconv/9_home_moritz_Home_Projekte_Minetest_minetest_mods_advtrains_assets_lyx_img_route_ex3.png
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diff --git a/assets/interlocking.html.LyXconv/interlocking.html b/assets/interlocking.html.LyXconv/interlocking.html
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+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"  
+  "http://www.w3.org/TR/html4/loose.dtd">  
+<html > 
+<head><title></title> 
+<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> 
+<meta name="generator" content="TeX4ht (http://www.tug.org/tex4ht/)"> 
+<meta name="originator" content="TeX4ht (http://www.tug.org/tex4ht/)"> 
+<!-- html --> 
+<meta name="src" content="interlocking.tex"> 
+<link rel="stylesheet" type="text/css" href="interlocking.css"> 
+</head><body 
+>
+<!--l. 18--><p class="noindent" >
+
+
+<!--l. 18--><p class="noindent" ><span 
+class="ecsx-1728">Interlocking</span>
+<span 
+class="ecsx-1728">System</span>
+<span 
+class="ecsx-1728">Guide</span>
+<div class="tabular"> <table id="TBL-1" class="tabular" 
+cellspacing="0" cellpadding="0"  
+><colgroup id="TBL-1-1g"><col 
+id="TBL-1-1"></colgroup><tr  
+ style="vertical-align:baseline;" id="TBL-1-1-"><td  style="white-space:nowrap; text-align:left;" id="TBL-1-1-1"  
+class="td00"></td></tr></table>
+</div>
+<a 
+ id="x1-2r1"></a>
+    <!--l. 20--><p class="noindent" ><span 
+class="ecsx-1200">1</span>   <span 
+class="ecsx-1200">Introduction</span>
+<a 
+ id="Q1-1-0"></a>
+<!--l. 22--><p class="noindent" >In real-world railways, a so-called interlocking system is a set of railway signals and trackside equipment. Its purpose is to prevent
+conflicting train movements which otherwise could result in derailing or colliding trains. If you want more information, just search for
+&#8220;railway interlocking&#8221; on the internet.
+<!--l. 28--><p class="noindent" >Real-world interlocking systems perform this task by setting routes. A route is a path along a track that a train can safely pass. To set a
+route for a train, the signalman (the operator of a signal box) has to set switches (turnouts) to the correct position and lock them in order
+to make a signal for a train show &#8220;Proceed&#8221;. In newer systems, this is done automatically by the interlocking system. A route can
+not be set if switches are locked to a wrong position by another route or if any portion of the route is occupied by a
+train.
+<!--l. 37--><p class="noindent" >The interlocking system in this Minetest mod tries to follow real-world interlocking systems as far as applicable. It divides tracks into
+track sections and implements a route setting mechanism following the same principle.
+<!--l. 42--><p class="noindent" >However, for the sake of simplicity of implementation and usage, not all concepts of real-world interlocking have been taken over.
+Especially, there is no mechanism for overlap.
+<!--l. 46--><p class="noindent" >If you are looking for a place to learn how real-world interlocking systems work, have a look at &#8220;SimSig&#8221;. By looking at their simulations,
+you can obtain experience on how to set up your own interlocking systems in AdvTrains. The SimSig glossary is a good place to look up
+unknown terms in this document.
+<!--l. 52--><p class="noindent" >
+<a 
+ id="x1-3r2"></a>
+    <!--l. 52--><p class="noindent" ><span 
+class="ecsx-1200">2</span>   <span 
+class="ecsx-1200">Setting</span>
+    <span 
+class="ecsx-1200">up</span>
+    <span 
+class="ecsx-1200">track</span>
+    <span 
+class="ecsx-1200">sections</span>
+<a 
+ id="Q1-1-0"></a>
+<!--l. 54--><p class="noindent" >In the real world, a line of track is divided into so-called track sections, or track circuits. Those systems often can not tell
+where exactly a train is, but only which track sections it occupies. A route can never be set through an occupied track
+section.
+<!--l. 59--><p class="noindent" >A track section often covers:
+     <ul class="itemize1">
+     <li class="itemize">A section on a main running line, between two signals
+     </li>
+     <li class="itemize">A single turnout
+     </li>
+     <li class="itemize">A rail crossing, or a set of turnouts acting as a double/single slip switch
+     </li>
+     <li class="itemize">A siding</li></ul>
+<!--l. 67--><p class="noindent" >You will find some examples on how to interlock certain patterns later.
+<!--l. 69--><p class="noindent" >
+<a 
+ id="x1-4r1"></a>
+      <!--l. 69--><p class="noindent" ><span 
+class="ecsx-1200">2.1</span>   <span 
+class="ecsx-1200">Track</span>
+      <span 
+class="ecsx-1200">Circuit</span>
+      <span 
+class="ecsx-1200">Breaks</span>
+<a 
+ id="Q1-1-0"></a>
+<!--l. 71--><p class="noindent" >In this mod, you will not directly configure the locations of track sections. Instead, you designate the borders of each track section using a
+special node, the Track Circuit Break, abbreviated TCB.
+<!--l. 75--><p class="noindent" >For example, if you want to create a track section for a piece of a main running line, you set up two TCBs at the ends of this track
+circuit.
+<!--l. 79--><p class="noindent" >Setting up a TCB works as follows:
+     <ol  class="enumerate1" >
+     <li 
+  class="enumerate" id="x1-6x1">Place a TCB node somewhere near the place where the circuit break is going to be located.
+     </li>
+     <li 
+  class="enumerate" id="x1-8x2">Right-click the TCB node
+     </li>
+     <li 
+  class="enumerate" id="x1-10x3">Punch the rail which should act as TCB</li></ol>
+<!--l. 86--><p class="noindent" >The result should look like this:
+<!--l. 88--><p class="noindent" ><img 
+src="0_home_moritz_Home_Projekte_Minetest_minetest_m___s_assets_lyx_img_screenshot_20180830_142551.png" alt="PIC"  
+>
+<!--l. 90--><p class="noindent" >Now you have assigned the TCB node to a rail. Right-click the TCB node once again. This will bring up a form which looks as
+follows:
+<!--l. 93--><p class="noindent" ><img 
+src="1_home_moritz_Home_Projekte_Minetest_minetest_m____lyx_img_Bildschirmfoto_2018-08-30_14-26-35.png" alt="PIC"  
+>
+<!--l. 95--><p class="noindent" >You see that the form is divided in side A and side B. To designate where each side is, a marker is displayed on the rail. You can always
+make this marker show up by punching the TCB node, and remove it by punching the marker. Both sides are shown as &#8220;End of
+interlocking&#8221;. This means that there is no track section set up at this place.
+<!--l. 101--><p class="noindent" >You should repeat this procedure once again a few meters away from the first TCB to create a second TCB on the same
+track.
+<!--l. 104--><p class="noindent" ><img 
+src="2_home_moritz_Home_Projekte_Minetest_minetest_m____lyx_img_Bildschirmfoto_2018-08-30_14-32-48.png" alt="PIC"  
+>
+<!--l. 106--><p class="noindent" >Once you have both bordering TCBs set up, you can now create the actual track section. To do this:
+     <ol  class="enumerate1" >
+     <li 
+  class="enumerate" id="x1-12x1">Right-click one of the TCBs
+     </li>
+     <li 
+  class="enumerate" id="x1-14x2">Locate the correct side (A or B) to create the track section
+     </li>
+     <li 
+  class="enumerate" id="x1-16x3">Click &#8220;Create interlocked Track Section&#8221; in the formspec on the chosen side.</li></ol>
+<!--l. 114--><p class="noindent" >Now, the text on the formspec has changed. It shows something like this:
+<!--l. 117--><p class="noindent" ><img 
+src="3_home_moritz_Home_Projekte_Minetest_minetest_m____lyx_img_Bildschirmfoto_2018-08-30_14-27-25.png" alt="PIC"  
+>
+<!--l. 119--><p class="noindent" >Clicking &#8220;Show Track Section&#8221; brings up another formspec:
+<!--l. 121--><p class="noindent" ><img 
+src="4_home_moritz_Home_Projekte_Minetest_minetest_m____lyx_img_Bildschirmfoto_2018-08-30_14-28-32.png" alt="PIC"  
+>
+<!--l. 123--><p class="noindent" >On the top, you see a list of all TCBs that border this track section. In your case, there should be two TCBs listed. If there&#8217;s only one,
+head over to <a 
+href="#x1-17r2">2.2<!--tex4ht:ref: subsec:Long-track-sections, --></a>. You should now select a name for the track section, to identify it later.
+<!--l. 128--><p class="noindent" >The same procedure is applicable when you create a turnout track section, except that you have to set up three or more
+TCBs.
+<!--l. 131--><p class="noindent" >The AdvTrains interlocking system allows you to add more TCBs after you have created a track section. This works without problems in
+most cases. For example, you can easily insert a turnout into an already set-up track section and create another TCB behind it, and
+AdvTrains will automatically detect the existing track section. Problems arise only if you try to insert a TCB in-between a section, in
+which case both sides of the TCB will end up assigned to the same section. The code currently does not handle this case properly, so try
+to avoid this situation by all means. As a last resort, you can always dissolve a faulty track section, as described in the next
+chapter.
+<!--l. 142--><p class="noindent" >
+<a 
+ id="x1-17r2"></a>
+      <!--l. 142--><p class="noindent" ><span 
+class="ecsx-1200">2.2</span>   <span 
+class="ecsx-1200">Long</span>
+      <span 
+class="ecsx-1200">track</span>
+      <span 
+class="ecsx-1200">sections,</span>
+      <span 
+class="ecsx-1200">crossings</span>
+      <span 
+class="ecsx-1200">and</span>
+      <span 
+class="ecsx-1200">other</span>
+      <span 
+class="ecsx-1200">edge</span>
+      <span 
+class="ecsx-1200">cases</span>
+<a 
+ id="Q1-1-0"></a>
+<!--l. 144--><p class="noindent" >
+<a 
+ id="x1-18r1"></a>
+      <!--l. 144--><p class="noindent" ><span 
+class="ecsx-1000">2.2.1</span>   <span 
+class="ecsx-1000">Very</span>
+      <span 
+class="ecsx-1000">long</span>
+      <span 
+class="ecsx-1000">track</span>
+      <span 
+class="ecsx-1000">sections</span>
+<a 
+ id="Q1-1-0"></a>
+<!--l. 146--><p class="noindent" >If you try to set up a track section that is longer than 1000 nodes, advtrains won&#8217;t recognize the TCB at the other end because of a safety
+limit in the traverser function, which is supposed to prevent deadlocks. This case has happened when the Track Section overview screen
+only shows one TCB in the list. The procedure for this is as follows:
+     <ol  class="enumerate1" >
+     <li 
+  class="enumerate" id="x1-20x1">Go to the second TCB (the one that wasn&#8217;t recognized). It should show &#8220;End of Interlocking&#8221; on the relevant side.
+     </li>
+     <li 
+  class="enumerate" id="x1-22x2">Click &#8220;Create interlocked track section&#8221;. The section created will be different from the one that is already present.
+     </li>
+     <li 
+  class="enumerate" id="x1-24x3">In the track section overview, click &#8220;Join into other section&#8221;
+     </li>
+     <li 
+  class="enumerate" id="x1-26x4">Go back to the first TCB, bring up the Track Section overview screen of the first track section and click &#8220;Join with ???&#8221;</li></ol>
+<!--l. 160--><p class="noindent" >The other, missing TCB should now appear in the list. If you accidentally started such a joining procedure, click the &#8220;X&#8221; button on the
+right.
+<!--l. 164--><p class="noindent" >
+<a 
+ id="x1-27r2"></a>
+      <!--l. 164--><p class="noindent" ><span 
+class="ecsx-1000">2.2.2</span>   <span 
+class="ecsx-1000">Rail</span>
+      <span 
+class="ecsx-1000">crosses</span>
+<a 
+ id="Q1-1-0"></a>
+<!--l. 166--><p class="noindent" >Since rail crosses are created by laying tracks across each other without logical connection, there&#8217;s no way for advtrains to know whether
+rails cross each other.
+<!--l. 170--><p class="noindent" >Rail crossings in interlocking systems are always one single track section, which in most cases has 4 TCBs adjacent.
+<!--l. 173--><p class="noindent" ><img 
+src="5_home_moritz_Home_Projekte_Minetest_minetest_m____lyx_img_Bildschirmfoto_2018-08-30_14-51-25.png" alt="PIC"  
+>
+<!--l. 175--><p class="noindent" >The procedure is quite similar to the one for long sections: First, create two track sections for the branches, and then use the &#8220;Join&#8221;
+function to merge both sections into one.
+<!--l. 179--><p class="noindent" >
+<a 
+ id="x1-28r3"></a>
+      <!--l. 179--><p class="noindent" ><span 
+class="ecsx-1000">2.2.3</span>   <span 
+class="ecsx-1000">Deleting</span>
+      <span 
+class="ecsx-1000">and</span>
+      <span 
+class="ecsx-1000">re-adding</span>
+      <span 
+class="ecsx-1000">single</span>
+      <span 
+class="ecsx-1000">TCBs</span>
+      <span 
+class="ecsx-1000">to</span>
+      <span 
+class="ecsx-1000">a</span>
+      <span 
+class="ecsx-1000">section</span>
+<a 
+ id="Q1-1-0"></a>
+<!--l. 181--><p class="noindent" >In some occasions, for example when you remove a siding or a crossover, it can be necessary to unassign a TCB from a track section.
+There are multiple ways to do this:
+     <ul class="itemize1">
+     <li class="itemize">In the TCB form, click the &#8220;Remove from section&#8221; button
+     </li>
+     <li class="itemize">In the track section form, first select the TCB in the list and then click &#8220;Unlink selected TCB&#8221;</li></ul>
+<!--l. 189--><p class="noindent" >The result is that the TCB shows &#8220;End of Interlocking&#8221; and the section does not list the TCB as an endpoint anymore.
+<!--l. 192--><p class="noindent" >The other case is adding a siding or a crossover, in which case one or more TCBs still show &#8220;End of Interlocking&#8221; although they should be
+part of a section:
+     <ul class="itemize1">
+     <li class="itemize">Go to another TCB that is registered in the track section and click &#8220;Update near TCBs&#8221;
+     </li>
+     <li class="itemize">If that did not work, follow the procedure of creating a long track section</li></ul>
+<!--l. 202--><p class="noindent" >
+<a 
+ id="x1-29r4"></a>
+      <!--l. 202--><p class="noindent" ><span 
+class="ecsx-1000">2.2.4</span>   <span 
+class="ecsx-1000">Dissolving</span>
+      <span 
+class="ecsx-1000">sections</span>
+<a 
+ id="Q1-1-0"></a>
+<!--l. 204--><p class="noindent" >If you made a mistake setting up something and you don&#8217;t see any other way to fix a misconfigured track section, you can always
+delete it using the &#8220;Dissolve section&#8221; button. This operation removes the track section and sets all TCBs that previously
+belonged to the section as &#8220;End of Interlocking&#8221;. This will always work and lets you start over new with setting up track
+sections.
+<!--l. 211--><p class="noindent" >
+<a 
+ id="x1-30r3"></a>
+      <!--l. 211--><p class="noindent" ><span 
+class="ecsx-1200">2.3</span>   <span 
+class="ecsx-1200">Interlocking</span>
+      <span 
+class="ecsx-1200">patterns</span>
+<a 
+ id="Q1-1-0"></a>
+<!--l. 213--><p class="noindent" >This section shows some examples on how you should set up track sections on certain track configurations.
+<!--l. 216--><p class="noindent" >
+<a 
+ id="x1-31r3"></a>
+    <!--l. 216--><p class="noindent" ><span 
+class="ecsx-1200">3</span>   <span 
+class="ecsx-1200">Signals</span>
+    <span 
+class="ecsx-1200">and</span>
+    <span 
+class="ecsx-1200">routes</span>
+<a 
+ id="Q1-1-0"></a>
+<!--l. 218--><p class="noindent" >The purpose of signals is to inform trains about whether they can proceed into the next section safely. Making a section of track safe to
+pass for a train, turnouts need to be set to the correct position and no other train should be allowed to cross or share parts of the route
+with this train.
+<!--l. 224--><p class="noindent" >
+<a 
+ id="x1-32r1"></a>
+      <!--l. 224--><p class="noindent" ><span 
+class="ecsx-1200">3.1</span>   <span 
+class="ecsx-1200">Assigning</span>
+      <span 
+class="ecsx-1200">Signals</span>
+      <span 
+class="ecsx-1200">to</span>
+      <span 
+class="ecsx-1200">TCBs</span>
+<a 
+ id="Q1-1-0"></a>
+<!--l. 226--><p class="noindent" >Signals in the advtrains interlocking system are positioned - like in real life - at the border of track sections.
+<!--l. 229--><p class="noindent" >When you set up a signal, do the following steps:
+     <ol  class="enumerate1" >
+     <li 
+  class="enumerate" id="x1-34x1">If not already happened, set up a TCB (you don&#8217;t need to, but are advised to, configure track sections there)
+     </li>
+     <li 
+  class="enumerate" id="x1-36x2">Place the signal a few meters in front of the TCB, so that trains stopping at the signal do never pass the TCB
+     </li>
+     <li 
+  class="enumerate" id="x1-38x3">Locate the side of the TCB which points in the direction that trains will proceed past the signal, as shown in the figure
+     below.
+     </li>
+     <li 
+  class="enumerate" id="x1-40x4">Right-click the TCB, and click &#8220;Assign a signal&#8221; on this side.
+     </li>
+     <li 
+  class="enumerate" id="x1-42x5">Punch the signal.</li></ol>
+<!--l. 240--><p class="noindent" ><img 
+src="6_home_moritz_Home_Projekte_Minetest_minetest_mods_advtrains_assets_lyx_img_assign_signal.png" alt="PIC"  
+>
+<!--l. 242--><p class="noindent" >You can assign a signal to each side of a TCB. This is, for example, useful when creating block sections on a bi-directional main running
+line.
+<!--l. 246--><p class="noindent" >
+<a 
+ id="x1-43r2"></a>
+      <!--l. 246--><p class="noindent" ><span 
+class="ecsx-1200">3.2</span>   <span 
+class="ecsx-1200">The</span>
+      <span 
+class="ecsx-1200">concept</span>
+      <span 
+class="ecsx-1200">of</span>
+      <span 
+class="ecsx-1200">routes</span>
+<a 
+ id="Q1-1-0"></a>
+<!--l. 248--><p class="noindent" >A so-called route is a locked path between two signals, which locks all turnouts in the correct position.
+<!--l. 251--><p class="noindent" >Example: Imagine a station with 2 platforms on a single track running line. We are looking at signal A. You probably want trains coming
+from the right to go into platform 1 or into platform 2, so you need to program 2 routes.
+<!--l. 256--><p class="noindent" ><img 
+src="7_home_moritz_Home_Projekte_Minetest_minetest_mods_advtrains_assets_lyx_img_route_ex1.png" alt="PIC"  
+>
+<!--l. 258--><p class="noindent" >This leads us to the most important aspect of route programming: Routes always start at a signal (A) and end at a signal facing in the
+<span 
+class="ecbx-1000">same direction </span>(D and E), not at an opposite-facing signal (B and C). There are only few exceptions, we&#8217;ll cover this
+later.
+<!--l. 263--><p class="noindent" >When you set a route to make a train proceed on it, the interlocking system ensures that:
+     <ul class="itemize1">
+     <li class="itemize">There are no rail vehicles on the route
+     </li>
+     <li class="itemize">All turnouts are set to the correct position and it is impossible to move them
+     </li>
+     <li class="itemize">No other routes can be set that would in any way conflict with this route</li></ul>
+<!--l. 272--><p class="noindent" >For this to work, you need to specify all track sections the train will pass along, as well as the positions of all turnouts that need to be
+locked. Those are not only the turnouts that lay directly on the train&#8217;s route, but also some turnouts on adjacent tracks, the so-called
+flank protection.
+<!--l. 278--><p class="noindent" >The purpose of flank protection is to prevent runaway trains and/or wagons to pass into a route. This is achieved by setting nearby
+turnouts to a position that points &#8220;away&#8221; from the route. Example:
+<!--l. 282--><p class="noindent" ><img 
+src="8_home_moritz_Home_Projekte_Minetest_minetest_mods_advtrains_assets_lyx_img_route_ex2.png" alt="PIC"  
+>
+<!--l. 284--><p class="noindent" >The upper turnout, of course, needs to be locked in straight (normal) position, while the lower one is not relevant for the route itself. But
+what if the lower turnout was set to the diverging (reverse) position and the driver of another train approaching signal B fails to see the
+red light? This train would crash into the first one. To minimise danger, that other train would need to be routed towards signal
+D.
+<!--l. 291--><p class="noindent" >There are, of course, situations, where both positions of a turnout would conflict with a route equally. In those situations, there&#8217;s nothing
+you can do and no flank lock needs to be set.
+<!--l. 295--><p class="noindent" >
+<a 
+ id="x1-44r3"></a>
+      <!--l. 295--><p class="noindent" ><span 
+class="ecsx-1200">3.3</span>   <span 
+class="ecsx-1200">Shunt</span>
+      <span 
+class="ecsx-1200">routes</span>
+<a 
+ id="Q1-1-0"></a>
+<!--l. 297--><p class="noindent" >Operating railways is not all about driving trains around. Coupling, decoupling and moving single engines, wagons or groups of wagons
+across a station, called shunting, also plays an important role.
+<!--l. 301--><p class="noindent" >Remember what we said about routes: There must be no rail vehicles on the route. So what if you have some goods wagons
+ready on a siding, and want to couple an engine to it? You can not set a regular route into the siding, because it is
+occupied.
+<!--l. 306--><p class="noindent" >The solution is to program a second route into the siding, but with the difference that it already ends at the rear-facing signal of it, so it
+doesn&#8217;t include the siding section itself:
+<!--l. 310--><p class="noindent" ><img 
+src="9_home_moritz_Home_Projekte_Minetest_minetest_mods_advtrains_assets_lyx_img_route_ex3.png" alt="PIC"  
+>
+<!--l. 312--><p class="noindent" >The Sht2 route then needs to show a shunt aspect, which instructs the driver to proceed slowly and watch out for vehicles on the route.
+To show a &#8220;free&#8221; aspect here would be wrong, because that would mean that the track is free until the next main signal, which it is clearly
+not.
+<!--l. 320--><p class="noindent" ><span 
+class="ecti-1000">Note that advtrains_interlocking currently does not allow to set individual aspects for routes, this is a feature still to be implemented</span>
+<span 
+class="ecti-1000">soon.</span>
+<!--l. 322--><p class="noindent" >Shunt routes like this are, so far, the only exception to the &#8220;Routes should end at a signal facing the same direction&#8221;
+rule.
+<!--l. 325--><p class="noindent" >
+<a 
+ id="x1-45r4"></a>
+      <!--l. 325--><p class="noindent" ><span 
+class="ecsx-1200">3.4</span>   <span 
+class="ecsx-1200">Route</span>
+      <span 
+class="ecsx-1200">Release</span>
+<a 
+ id="Q1-1-0"></a>
+<!--l. 327--><p class="noindent" >In early real-life interlocking systems, routes either had to be cancelled by the signalman after the train had passed the route, or there was
+a single release contact at the end of the route. However, as interlocking systems evolved and the position of trains is now
+roughly known by the track sections, portions of the route can be freed as soon as the train has left the corresponding
+section.
+<!--l. 334--><p class="noindent" >AdvTrains has chosen a modern approach to route releasing. Each turnout lock is associated to a track section belonging to the route&#8217;s
+path. Once the train leaves this section, all assigned locks are also freed.
+<!--l. 338--><p class="noindent" >
+<a 
+ id="x1-46r5"></a>
+      <!--l. 338--><p class="noindent" ><span 
+class="ecsx-1200">3.5</span>   <span 
+class="ecsx-1200">Programming</span>
+      <span 
+class="ecsx-1200">a</span>
+      <span 
+class="ecsx-1200">route</span>
+<a 
+ id="Q1-1-0"></a>
+<!--l. 340--><p class="noindent" >The route programming procedure is quite straightforward if you&#8217;ve read the previous sections and understood how routes should be
+set.
+<!--l. 343--><p class="noindent" >Routes always start at a signal. You must have assigned the signal to a TCB, as described earlier.
+<!--l. 346--><p class="noindent" >When you right-click the signal, it no longer changes its aspect. Instead, a formspec pops up, showing you an (empty) list of routes with
+the possibility to set them or to create new routes. Click the &#8220;Create new route&#8221; button to start programming a new
+route.
+<!--l. 351--><p class="noindent" >The form closes, and an arrow is displayed on the TCB. You are now in &#8220;Route Programming&#8221; mode, programming the first track section
+of the route. Now:
+     <ul class="itemize1">
+     <li class="itemize">Put any turnouts you need to lock in the correct position (e.g. by right-clicking them). This includes flank protection.
+     </li>
+     <li class="itemize">Punch them. This makes a marker saying &#8220;Route Lock Editing&#8221; appear.
+     </li>
+     <li class="itemize">If you punch a turnout again, or punch the marker, you can remove the lock again.
+     </li>
+     <li class="itemize">When you&#8217;ve locked all turnouts in the current section, go to and punch the TCB that is the border to the next track
+     section the train proceeds into.</li></ul>
+<!--l. 364--><p class="noindent" >Once you&#8217;ve done this, the lock markers change to &#8220;Route Lock&#8221;, telling they can&#8217;t be changed anymore. Repeat the above procedure until
+you have punched the final TCB, at which the route should end. As mentioned before, there should be a signal at this place,
+however this is not enforced. Now, run the chat command <span 
+class="ectt-1000">/at_rp_set &#x003C;name of route&#x003E; </span>to complete programming the
+route.
+<!--l. 371--><p class="noindent" >A few hints:
+     <ul class="itemize1">
+     <li class="itemize">If one turnout should be locked by more than one section, set the lock only in the <span 
+class="ectt-1000">last </span>of those sections. Locking the same
+     turnout in multiple sections of a single route results in undefined behavior!
+     </li>
+     <li class="itemize">If you accidentally punched a TCB, you can run <span 
+class="ectt-1000">/at_rp_back </span>to undo this and return to the previous section. Due to a
+     bug, you have to re-set all locks of this section.
+     </li>
+     <li class="itemize">If you want to stop programming the entire route without saving it, run <span 
+class="ectt-1000">/at_rp_discard</span></li></ul>
+<!--l. 384--><p class="noindent" >
+<a 
+ id="x1-47r4"></a>
+    <!--l. 384--><p class="noindent" ><span 
+class="ecsx-1200">4</span>   <span 
+class="ecsx-1200">Interlocking</span>
+    <span 
+class="ecsx-1200">system</span>
+    <span 
+class="ecsx-1200">operation</span>
+<a 
+ id="Q1-1-0"></a>
+<!--l. 386--><p class="noindent" >Setting up the interlocking for a portion of a railway network requires some time, experience and planning, but once done, there&#8217;s not
+much to do anymore to make trains run on your, now safer, railway. This section covers some useful practices to route trains across your
+network.
+<!--l. 391--><p class="noindent" >At the moment, routes can only be set by clicking the signal or via LuaATC, except if you use automatic working. It is planned to control
+this via the onboard computer and via a &#8220;signal box&#8221; view based on the currently broken itrainmap.
+<!--l. 396--><p class="noindent" >
+<a 
+ id="x1-48r1"></a>
+      <!--l. 396--><p class="noindent" ><span 
+class="ecsx-1200">4.1</span>   <span 
+class="ecsx-1200">Simple</span>
+      <span 
+class="ecsx-1200">route</span>
+      <span 
+class="ecsx-1200">setting</span>
+      <span 
+class="ecsx-1200">and</span>
+      <span 
+class="ecsx-1200">cancelling</span>
+<a 
+ id="Q1-1-0"></a>
+<!--l. 398--><p class="noindent" >To set a route, simply right-click the signal, select a route and click &#8220;set route&#8221;. If there are no conflicts, the signal turns green and the
+train is allowed to proceed.
+<!--l. 402--><p class="noindent" >It may be possible that the route can not be set, because one or more other routes conflict with the current one, or a section is blocked. In
+this case, the signal stays red, and the conflicting item is shown in the formspec. As soon as the conflict is resolved (by cancellation
+or release of the conflicting route, or the section becoming free), the requested route will be set and the signal turns
+green.
+<!--l. 409--><p class="noindent" >If a route is either requested or set, it can be cancelled from the signalling formspec. This means that all turnouts and sections are
+released, and the signal reverts back to red. This of course only works when the train has not passed the signal yet. There is no
+mechanism for Approach Locking.
+<!--l. 415--><p class="noindent" >
+<a 
+ id="x1-49r2"></a>
+      <!--l. 415--><p class="noindent" ><span 
+class="ecsx-1200">4.2</span>   <span 
+class="ecsx-1200">Automatic</span>
+      <span 
+class="ecsx-1200">Working</span>
+<a 
+ id="Q1-1-0"></a>
+<!--l. 417--><p class="noindent" >Block signals on main running lines usually only have a single route to set, the one proceeding along the main line. Their purpose is only
+to show whether there are trains in the next section. So, it would be convenient if this only route would set itself again after a train
+passed.
+<!--l. 423--><p class="noindent" >This is what Automatic Working is for. Set a route, click &#8220;Enable Automatic Working&#8221;, and as soon as a train passes, the route is
+automatically re-set.
+<!--l. 427--><p class="noindent" >This function is nearly identical to SimSig automatic signals. It can also be useful on a line with high traffic, when there&#8217;s a
+low-frequented access to a siding. You&#8217;d enable automatic working for the main route and cancel it only when you need a train to go into
+the siding.
+<!--l. 432--><p class="noindent" >
+<a 
+ id="x1-50r5"></a>
+    <!--l. 432--><p class="noindent" ><span 
+class="ecsx-1200">5</span>   <span 
+class="ecsx-1200">Final</span>
+    <span 
+class="ecsx-1200">notes</span>
+<a 
+ id="Q1-1-0"></a>
+<!--l. 434--><p class="noindent" >The interlocking system is mainly finished, though there are still some plans and ideas. They include:
+     <ul class="itemize1">
+     <li class="itemize">Setting routes from inside a train (via onboard computer)
+     </li>
+     <li class="itemize">Signalbox panels, as revival of itrainmap
+     </li>
+     <li class="itemize">Individual signal aspects for routes
+     </li>
+     <li class="itemize">Distant signals
+     </li>
+     <li class="itemize">On-Train head-up display for oncoming signals (they have something like this in Czech Republic, I forgot how it&#8217;s called.)</li></ul>
+<!--l. 444--><p class="noindent" >Apart from this, there&#8217;s the large oncoming project of a new timetable-based train automation system, but this will take some time to
+evolve and is out of the scope of this document.
+<!--l. 448--><p class="noindent" >If you have any suggestions, corrections, improvements, criticism or cute kittens and stuff, you can always contact me by various means
+(Forum PM, E-Mail (orwell@bleipb.de), Linuxworks server chat a.s.o.). Have fun!
+<!--l. 453--><p class="noindent" >- orwell  
+</body></html> 
+
+
+