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→Chain signals explained
* ''At crossings'' to prevent train from blocking the crossing, if the train cannot continue beyond it. Correctly placed signals are '''Chain before''' the crossing and '''Block after''' the crossing. If the track after the crossing is empty -> the block signal is green -> the chain signal before the crossing is green. If the block after the crossing is occupied -> the block signal is red -> the chain signal before the crossing is red as well so next train won't enter the crossing thus it will not block the traffic on the other track.
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[[file:Chain_at_crossing.png|300px315px]]
[[file:Chain_at_crossing_red.png|300px]]
<br>* ''At the switch'' where train can choose '''any''' tracks and should wait for '''the first available''' if all of the tracks are occupied. Most common use is at multi-platform stations (as long as the exit lines from all the platforms lead to another common destination / node / switch, so train can use any available platform), at parallel tunnels (signals cannot be placed inside the tunnel, so longer tunnel becomes a bottleneck for the rail network. That could be mitigated by building parallel tunnel in the same direction, which doubles the number of trains traveling at once) or at any other parallel tracks built to increase the throughput of the network. <br>[[File:Chain_at_switch.png|300px]][[File:Chain_at_switch_red.png|300px]]