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[quote user="Bucyrus"] silicon212,Thanks for that explanation.  I always wondered how the signals knew how to clear the instant the train cleared, yet were set to activate when the train was a long way off.  But I have another related question that I have raised before in other threads.  Is there any possibility for the signals to fail to activate when a train is in the circuit?  I know that the system is called, "fail safe," and has battery backup, but I am still wondering if it is absolutely 100% guaranteed to work.  If it can fail to activate, how common or likely is it, and how would such a failure occur?[/quote]Just from my experience crossing signals are not 100%  I have seen lightning take them out, and also cause false activations. If we had a false activation or activation falure, and the dispatcher knew ahead of time, they would call us with the location of the crossing and we proceeded to the crossing and would be governed by the operationg rules.
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