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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?
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