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[quote user="zugmann"]So we need a train to prove whether the track is safe for a train to pass, yet we want the train to be prepared to stop before the track that may not be safe for the train to pass, even though the only way we know the track is safe for a train to pass is by having a train pass the track that we don't know is safe to pass?[/quote] No, the railroad could follow Rule 6.21. Regards, Volker
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