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[[file:Bi-Directional_station.png|300px]]
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== Chain signals explained ==<br>
'''Definition'''<br>
''Chain signal will be green if there is at least one green signal behind it.'' <br>
While it sounds complicated, it simply means that the signal will "look" down the line and if he sees all red, it will be red, if he sees at least one green, it will turn green.<br>
If should be noted that incorrectly placed chain signal will not cause an accident, but it will make the trains wait longer, thus the rail network will be less efficient as a whole.
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'''Correct use'''<br>
There are two main situation where chain signal should be used:<br>
* ''At crossings'' to prevent train from blocking crossing, if the train cannot continue after 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 no train will enter the crossing thus it will not block the traffic on the other track.
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[[file:Chain_at_crossing.png|300px]]
[[file:Chain_at_crossing_red.png|300px]]
