DAS-BAHN-FORUM.de

Does anyone know in what order trains are released if you have multiple signals in one system?

I have four sidings which release trains to one track. I don't mind what order they are sent. There are four signals (one per siding) with one release. I fill the sidings with a cascade of points "alternating" so they are filled in order. The releases are apparently random, but is this true?

The problem is that one siding can fill up because it is not selected for a long time when the signals go to green.


Dateianhang/Attachment:

Hello,

<table width="90%" cellspacing="1" cellpadding="3" border="0" align="center"><tr> <td><span class="genmed">Zitat:</span></td></tr><tr><td class="quote">Does anyone know in what order trains are released if you have multiple signals in one system?

[...]

The problem is that one siding can fill up because it is not selected for a long time when the signals go to green.</tr></td></table>
The trains are released randomly. A solution is to build four additional signalling systems, one per track, which count the vehicles on each track. The switches must then be signal-dependent.

Hello,

<table width="90%" cellspacing="1" cellpadding="3" border="0" align="center"><tr> <td><span class="genmed">Zitat:</span></td></tr><tr><td class="quote">Hello,

<table width="90%" cellspacing="1" cellpadding="3" border="0" align="center"><tr> <td><span class="genmed">Zitat:</span></td></tr><tr><td class="quote">Does anyone know in what order trains are released if you have multiple signals in one system?

[...]

The problem is that one siding can fill up because it is not selected for a long time when the signals go to green.</tr></td></table>

The trains are released randomly.</tr></td></table>

Yes. Sometimes a FIFO algorithm is discussed (FIFO = First In - First Out, same as at timing points with multiple tracks). However, there is nobody who stores the order of incoming and waiting trains, to use it when the signals turn to "Clear". It would a bit complicated especially in future versions, where different signals may depend on multiple systems / conditions.

Regards
Jan B.

I was wondering about the example used in the dialog window of alternation turnout:

Examples for start into certain direction:

direction1: 0
direction2: value for direction1
direction3: sum of values for dir1+dir2


Beispiele für Start in bestimmte Richtung:

Richtung1: 0
Richtung2: Wert für Richtung1
Richtung3: Summe der Werte für Ri1+Ri2


What exactly does it mean? When zero is entered for direction 1, then the trains would never go there.

Those examples suggest what the starting value of the counter might be, not the values to enter for the alternation. The counter keeps track of how many trains have passed to decide where each one goes, so the starting value decides which way the first train to pass goes.