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→Chain signals explained
Using chain signal at switch is extremely important at the end station where there are bi-directional signals. Placing block signal here would cause the train getting stuck nose-to-nose (see the image in bi-directional signals section above)
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Even quite complex crossing can be managed successfully by correct use of both chain and block signals:
<br>[[file:4-2_crossing.png|400px]]<br>
Of course, every crossing has a limit how many trains can go through before it gets overwhelmed. Crossings are good for low to moderate traffic, but for high traffic areas one way drive-through stations and interchange with bridges and tunnels should be used.
'''Common mistakes'''
* placing the chain signal at the switch where train '''cannot''' choose any track (aka each track after the switch leads to different destination). The chain signal here will be useless and will work as less efficient block signal. <br>
[[File:Chain_at_switch_incorrect.png|300px]]<br>* placing chain signal at the ''exit'' track of the crossing. There is absolutely no harm in doing so, but the train will needlessly wait for whole another block to be clear while it could have been moving already - it is harmless but very inefficient using of chain signals.
