In article .com, BRB
Class 465 writes
However, railway signalling is designed to prevent *unsafe* situations
from arising. A train ending up on the wrong route isn't really
unsafe, merely inconvenient (with certain exceptions, for example if
the train is too large to fit into a tunnel).

And that sort of exception *is* catered for by the signalling (e.g. with
height detectors connected to the signals).

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