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<!--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"  
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<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" >Have a look at the following images. They show you how you can set up sections so that reasonable train moves are
possible.
<!--l. 216--><p class="noindent" >You should settle on a naming scheme for your sections. This way, you can determine the source of an issue faster
<!--l. 219--><p class="noindent" >
<a 
 id="x1-31r3"></a>
    <!--l. 219--><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. 221--><p class="noindent" >Signals are appliances that can give instructions to trains. That can be the permission to proceed, a speed restriction, or other
information.
<!--l. 224--><p class="noindent" >There are 2 types of signals:
     <ul class="itemize1">
     <li class="itemize">Static signals always display the same information to the train. This can be a speed restriction (or the end of one), a
     disallowal to proceed as shunt move or similar things. In most cases, these are signs.
     </li>
     <li class="itemize">Dynamic signals are what most people would call a &#8220;signal&#8221;. Its function is to inform trains about whether and at which
     speed they can proceed into the next section safely.</li></ul>
<!--l. 234--><p class="noindent" >
<a 
 id="x1-32r1"></a>
      <!--l. 234--><p class="noindent" ><span 
class="ecsx-1200">3.1</span>   <span 
class="ecsx-1200">Signal</span>
      <span 
class="ecsx-1200">Influence</span>
      <span 
class="ecsx-1200">Point</span>
<a 
 id="Q1-1-0"></a>
<!--l. 236--><p class="noindent" >Every signal is associated to a track on which the instruction should be followed. Signals are usually placed right next to the track on the
right side. Human observers do know then that the signal belongs to the track left of it, however, train safety systems (like the one in
advtrains) can not.
<!--l. 242--><p class="noindent" >This is the reason why a so-called &#8220;influence point&#8221; needs to be assigned to any signal that should actually give instructions to trains,
should the driver (if even there is one) fail to recognize the instructions.
<!--l. 247--><p class="noindent" >Depending on the signal and the mod that adds the signal, there are different ways to configure this. Signals integrated into advtrains
behave as follows:
     <ul class="itemize1">
     <li class="itemize">Static signals and all red-green light signals from core advtrains that are not assigned to a TCB can be configured by
     holding the &#8220;Use&#8221; key and then right-clicking the signal
     </li>
     <li class="itemize">All signals that are assigned to a TCB can be configured by first right-clicking them, then selecting &#8220;Influence Point&#8221; in
     the signalling formspec.</li></ul>
<!--l. 258--><p class="noindent" >The small formspec that opens allows you to set and later view or clear the Influence Point. To set the influence point, click the &#8220;Set&#8221;
button, face towards the signal and punch a rail about 2m in front of the signal. A small marker will be shown, indicating success. To
cancel setting an influence point, punch anything other. (note that then the influence point remains unset, regardless of its previous
state)
<!--l. 266--><p class="noindent" >The advtrains-internal train safety system ensures that the train always obeys any restrictions imposed by signals, if (and only if) the
influence point is set properly.
<!--l. 270--><p class="noindent" >
<a 
 id="x1-33r2"></a>
      <!--l. 270--><p class="noindent" ><span 
class="ecsx-1200">3.2</span>   <span 
class="ecsx-1200">Signal</span>
      <span 
class="ecsx-1200">Aspects</span>
<a 
 id="Q1-1-0"></a>
<!--l. 272--><p class="noindent" >While static signals are mainly used for speed restrictions, the interesting ones are variable signals. Of course, you can always control any
variable signal by traditional means (mesecons, digiline, right-click) if the signal allows it, but that misses the point of this interlocking
system.
<!--l. 277--><p class="noindent" >A signal aspect is a piece of information that a signal shows to the train driver. It contains information about whether and at what speed
the driver may proceed at the signal.
<!--l. 281--><p class="noindent" >Every signal, both static and dynamic ones, imposes a certain aspect to trains passing the signal. For static signals, this is always the
same aspect, such as &#8220;Proceed at speed of 8&#8221; or &#8220;Shunt moves may not pass&#8221;. Dynamic signals, however, can display multiple different
aspects. The default for them is always as restrictive as possible, mostly &#8220;Halt!&#8221;.
<!--l. 288--><p class="noindent" >You should know that both static and dynamic signals use exactly the same properties for signal aspects. There is no difference in the
meaning of the aspect definitions.
<!--l. 292--><p class="noindent" >In the following sections, we will talk about main signals. By this, we mean a variable signal that can display both a &#8220;Danger&#8221; aspect
(trains are not allowed to proceed) and at least one &#8220;Proceed&#8221; aspect (train may proceed as train/shunt move, with optional speed
restriction), which act as an &#8220;entry signal&#8221; for one or multiple routes.
<!--l. 299--><p class="noindent" >
<a 
 id="x1-34r3"></a>
      <!--l. 299--><p class="noindent" ><span 
class="ecsx-1200">3.3</span>   <span 
class="ecsx-1200">Train</span>
      <span 
class="ecsx-1200">moves</span>
      <span 
class="ecsx-1200">and</span>
      <span 
class="ecsx-1200">Shunt</span>
      <span 
class="ecsx-1200">Moves</span>
<a 
 id="Q1-1-0"></a>
     <ul class="itemize1">
     <li class="itemize">A &#8220;Train move&#8221; is a train that is running, going to run on or coming from a main line between stations, passing through
     or stopping at a station. Train moves can expect that there are no obstacles on the route and they can proceed at the
     maximum permitted speed of the line. This is the regular operation mode for trains. Shunt signals have no meaning for
     train moves.
     </li>
     <li class="itemize">A &#8220;Shunt move&#8221; is a train that moves within a station and/or is coupling or decoupling wagons or engines. A shunt move
     may never leave a station except into a siding. Also, shunt moves may drive at a maximum speed of 6 speed units, because
     it is usually not ensured that the path is free of obstacles. (however, advtrains ensures that every route is free of railway
     vehicles, even shunt routes)</li></ul>
<!--l. 314--><p class="noindent" >There are also 2 general types of signals: Main signals and Shunt signals. While main signals have a meaning for all types of trains, Shunt
signals only have to be followed by shunt moves. Usually, Shunt signals that are on a train move route are set to a Proceed aspect as
well.
<!--l. 320--><p class="noindent" >When a train reverses, its mode automatically changes to &#8220;shunt move&#8221; until it passes a main signal that shows &#8220;Proceed as
train move&#8221;, which is usually designated by a green light. From this point on, it can accelerate to maximum permitted
speed.
<!--l. 325--><p class="noindent" >Some main signals, like the ones from the Ks signals mod included by default, can also display &#8220;Proceed as shunt move&#8221;, which is
designated by 2 white lights along with the red light. Once a train passes this signal, it becomes a shunt move.
<!--l. 330--><p class="noindent" >
<a 
 id="x1-35r4"></a>
      <!--l. 330--><p class="noindent" ><span 
class="ecsx-1200">3.4</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. 332--><p class="noindent" >A so-called route is a locked path between two main signals, which locks all turnouts in the correct position. Its purpose is to offer a train
a path on which it can safely proceed without interfering with any other train. A route always incorporates and locks one to multiple
track sections, starting with the one that lies directly behind the &#8220;entry&#8221; signal.
<!--l. 339--><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. 344--><p class="noindent" ><img 
src="6_home_moritz_Home_Projekte_Minetest_minetest_mods_advtrains_assets_lyx_img_route_ex1.png" alt="PIC"  
>
<!--l. 346--><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. 351--><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. 360--><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. 366--><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. 370--><p class="noindent" ><img 
src="7_home_moritz_Home_Projekte_Minetest_minetest_mods_advtrains_assets_lyx_img_route_ex2.png" alt="PIC"  
>
<!--l. 372--><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. 379--><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. 383--><p class="noindent" >
<a 
 id="x1-36r5"></a>
      <!--l. 383--><p class="noindent" ><span 
class="ecsx-1200">3.5</span>   <span 
class="ecsx-1200">Assigning</span>
      <span 
class="ecsx-1200">main</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. 385--><p class="noindent" >Main signals in the advtrains interlocking system are positioned - like in real life - at the border of track sections, because routes also start
and end there. For advtrains to know from which signal which routes can be set, you need to assign the signal to a
TCB.
<!--l. 390--><p class="noindent" >To do this, perform the following steps:
     <ol  class="enumerate1" >
     <li 
  class="enumerate" id="x1-38x1">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="x1-40x2">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="x1-42x3">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="x1-44x4">Right-click the TCB, and click &#8220;Assign a signal&#8221; on this side.
     </li>
     <li 
  class="enumerate" id="x1-46x5">Punch the signal.</li></ol>
<!--l. 401--><p class="noindent" ><img 
src="8_home_moritz_Home_Projekte_Minetest_minetest_mods_advtrains_assets_lyx_img_assign_signal.png" alt="PIC"  
>
<!--l. 403--><p class="noindent" >If you haven&#8217;t set an influence point for the signal yet, the influence point formspec automatically opens.
<!--l. 406--><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. 410--><p class="noindent" >Only main signals can ever be assigned to TCBs, because static ones can either not display &#8220;Danger&#8221; or do not permit to proceed at
all.
<!--l. 414--><p class="noindent" >
<a 
 id="x1-47r6"></a>
      <!--l. 414--><p class="noindent" ><span 
class="ecsx-1200">3.6</span>   <span 
class="ecsx-1200">Shunt</span>
      <span 
class="ecsx-1200">routes</span>
<a 
 id="Q1-1-0"></a>
<!--l. 417--><p class="noindent" ><span 
class="ecbx-1000">The information in this section is subject to future change because of safety issues!</span>
<!--l. 419--><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. 423--><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. 428--><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. 432--><p class="noindent" ><img 
src="9_home_moritz_Home_Projekte_Minetest_minetest_mods_advtrains_assets_lyx_img_route_ex3.png" alt="PIC"  
>
<!--l. 434--><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.
See later on for how to set this up.
<!--l. 438--><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. 441--><p class="noindent" >
<a 
 id="x1-48r7"></a>
      <!--l. 441--><p class="noindent" ><span 
class="ecsx-1200">3.7</span>   <span 
class="ecsx-1200">Route</span>
      <span 
class="ecsx-1200">Release</span>
<a 
 id="Q1-1-0"></a>
<!--l. 443--><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. 450--><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. 454--><p class="noindent" >Please note that reversing a train outside of stations is not only discouraged, but also very dangerous, because even
real-world interlocking system do not expect this. There is a clear, human-sense rule that you should never reverse the
driving direction of a train while on a main line or on a turnout. Else, you can be considered a terrorist. (quote from
professional!)
<!--l. 461--><p class="noindent" >
<a 
 id="x1-49r8"></a>
      <!--l. 461--><p class="noindent" ><span 
class="ecsx-1200">3.8</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. 463--><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. 466--><p class="noindent" >Routes always start at a main signal. You must have assigned the signal to a TCB, as described earlier.
<!--l. 469--><p class="noindent" >When you right-click the main 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. 474--><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 with a blue lock symbol 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. 487--><p class="noindent" >Depending on the situation, you are now offered some possibilities to proceed:
     <ul class="itemize1">
     <li class="itemize">Click the &#8220;Advance to next section&#8221; button if your route consists of more sections with turnouts to lock, and you need to
     continue programming. Follow the above steps to set locks for the next section.</li></ul>
<!--l. 494--><p class="noindent" >Once you&#8217;ve clicked the &#8220;Advance&#8221; button, the lock markers change to a red lock symbol, telling they can&#8217;t be changed anymore. Repeat
the above procedure until you are ready to complete the programming procedure:
     <ul class="itemize1">
     <li class="itemize">Click the &#8220;Finish route HERE&#8221; button when you&#8217;ve set up the locks for the last track section of the route and punched the
     final TCB (the one with the next signal). You will be asked for a route name and your route will be saved.
     </li>
     <li class="itemize">The &#8220;Finish route at end of NEXT section&#8221; button (third button) is an useful quickhand to make the route proceed one
     more section. Using this button is equivalent to first clicking the &#8220;Advance&#8221; button, then flying to the end of the next track
     section and finishing the route there. You can not (officially) set turnout locks in the final section using this method.</li></ul>
<!--l. 510--><p class="noindent" >A few hints:
     <ul class="itemize1">
     <li class="itemize">If you accidentally advanced the route wrongly, you can use the &#8220;Step back one section&#8221; button to undo this.
     </li>
     <li class="itemize">If you want to stop programming the entire route without saving it, use the &#8220;Cancel route programming&#8221; button.
     </li>
     <li class="itemize">The third button is especially useful for programming simple block sections on a main running line, since you can stay at
     the starting signal (punch starting TCB and select third button).
     </li>
     <li class="itemize">If a route should end in a dead end, you MUST use the &#8220;Finish in NEXT section&#8221; button, because there is no final TCB
     that you could punch.
     </li>
     <li class="itemize">The third button does NOT work on sections with more than 2 exits, because the system won&#8217;t be able to determine the
     final TCB of the route then.</li></ul>
<!--l. 527--><p class="noindent" >
<a 
 id="x1-50r9"></a>
      <!--l. 527--><p class="noindent" ><span 
class="ecsx-1200">3.9</span>   <span 
class="ecsx-1200">Route</span>
      <span 
class="ecsx-1200">information</span>
      <span 
class="ecsx-1200">screen</span>
<a 
 id="Q1-1-0"></a>
<!--l. 529--><p class="noindent" ><img 
src="10_home_moritz_Home_Projekte_Minetest_minetest_____lyx_img_Bildschirmfoto_2019-01-15_19-28-09.png" alt="PIC"  
>
<!--l. 531--><p class="noindent" >This is the screen that appears when you click &#8220;Edit Route&#8221;. It lets you change the route name and delete the route. Also, it shows a
summary of the route and its elements.
<!--l. 535--><p class="noindent" >The route summary lists information per track section on the route, so the line starting with &#8220;1&#8221; is the first section of the
route.
<!--l. 538--><p class="noindent" >The ARS rule list and its purpose is explained later.
<!--l. 540--><p class="noindent" >
<a 
 id="x1-51r10"></a>
       <!--l. 540--><p class="noindent" ><span 
class="ecsx-1200">3.10</span>   <span 
class="ecsx-1200">Specifying</span>
       <span 
class="ecsx-1200">signal</span>
       <span 
class="ecsx-1200">aspects</span>
<a 
 id="Q1-1-0"></a>
<!--l. 542--><p class="noindent" >By default, newly programmed routes show an aspect that comes closest to &#8220;Proceed at maximum speed&#8221;. However, it can be desirable to
change this behavior, like when the route passes a diverging turnout, the train should be signalled to drive slower, or the route is a shunt
route and therefore only &#8220;Shunting allowed&#8221; should be shown.
<!--l. 548--><p class="noindent" >This is the purpose of the &#8220;Change Aspect&#8221; button in the route info screen.
<!--l. 551--><p class="noindent" >Signal aspects in advtrains consist of 4 sections: main (Information for train moves), dst (Distant signal information, not implemented
yet), shunt (Information for shunt moves) and info (additional information, currently not in use).
     <ul class="itemize1">
     <li class="itemize">Train may proceed as train move at maximum speed: &#8220;main: free, speed -1&#8221;
     </li>
     <li class="itemize">Train may proceed as train move at speed of 8: &#8220;main: free, speed 8&#8221;
     </li>
     <li class="itemize">Train may proceed as shunt move: &#8220;shunt: free&#8221;</li></ul>
<!--l. 562--><p class="noindent" >There&#8217;s a field in the &#8220;shunt&#8221; part of signal aspects that is not displayed in the GUI, but is of potential interest to developers of signal
addons: shunt.proceed_as_main.
     <ul class="itemize1">
     <li class="itemize">A train move can always become a shunt move by passing a signal that shows &#8220;Halt for train moves, shunting permitted&#8221;
     </li>
     <li class="itemize">A shunt move can only pass a signal saying &#8220;Proceed as train move, shunting not permitted&#8221; when proceed_as_main is
     true.</li></ul>
<!--l. 571--><p class="noindent" >The property is used by the Limit Of Shunt sign, where proceed_as_main is set to false. Shunt moves have to stop in front of it, while
train moves are signalled &#8220;Proceed&#8221;. Regular main signals that show &#8220;green&#8221; have the field set to true, so that all trains can pass
it.
<!--l. 577--><p class="noindent" >
<a 
 id="x1-52r4"></a>
    <!--l. 577--><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. 579--><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. 584--><p class="noindent" >At the moment, routes can either be set by clicking the signal or via LuaATC, or by using the &#8220;Remote Routesetting&#8221;
button from the Onboard Computer. It is planned to control this via a &#8220;signal box&#8221; view based on the currently broken
itrainmap.
<!--l. 589--><p class="noindent" >
<a 
 id="x1-53r1"></a>
      <!--l. 589--><p class="noindent" ><span 
class="ecsx-1200">4.1</span>   <span 
class="ecsx-1200">Train</span>
      <span 
class="ecsx-1200">Safety</span>
      <span 
class="ecsx-1200">System</span>
<a 
 id="Q1-1-0"></a>
<!--l. 591--><p class="noindent" >The Train Safety System, called &#8220;LZB&#8221; in the code (from the german term Linienzugbeeinflussung, although this is a completely different
system), ensures that trains obey any restrictions imposed by signals when influence points are set. This way, it is not possible to pass
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0740	aa 0e a3 37 5d ba 7e ed cc e1 c4 46 ea 33 0f 78 ba c6 81 67 37 76 8d f3 e1 eb ab a2 30 80 da 77	...7].~....F.3.x...g7v......0..w
0760	e8 e2 2d 9b d7 2e 99 6a 64 ea bb 51 37 0e a4 1c 38 b4 66 78 47 35 5f 06 c0 09 e0 dd 73 ec 84 91	..-....jd..Q7...8.fxG5_.....s...
0780	83 7a 07 6a ff a2 3e 1b 07 86 4d 9a 3f b9 97 17 1f 27 00 60 d2 7a 77 f1 f3 d1 b6 6d 2d fc 03 51	.z.j..>...M.?....'.`.zw....m-..Q
07a0	d3 ae 53 48 a0 b7 d8 4a e0 c0 01 40 60 a8 d4 6a 95 d0 2c 54 a2 a8 6a c5 85 01 80 d0 34 4d fd 0f	..SH...J...@`..j..,T..j.....4M..
07c0	0f 06 00 cd 55 96 53 03 80 e6 cb ca a7 01 40 0b 44 e5 51 7f d0 22 51 c9 1b 00 3f 11 0a fd f1 2b	....U.S.......@.D.Q.."Q...?....+
07e0	e1 bc e9 0f 5a ae 26 7f fa c3 03 ff e5 9a 5f ed c0 31 01 00 00 00 c2 20 fb a7 b6 c4 4e 58 0a 00	....Z.&......._..1..........NX..
0800	00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00	................................
0820	00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00	................................
0840	00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00	................................
0860	00 00 00 00 00 00 00 00 00 00 00 00 00 0e 49 ab f5 5c ba ff e4 72 00 00 00 00 49 45 4e 44 ae 42	..............I..\...r....IEND.B
0880	60 82	`.