Rule 571 — Restoring Signals to Stop

1. (a)Signals must not be restored to indicate stop when the train or transfer for which signals were first cleared is less than three blocks distant from the first of such signals, unless the locomotive engineer has acknowledged that they are stopped or able to stop their train or transfer without passing the controlled signal to be restored.
2. (b)In case of emergency, a signal may be restored to stop at any time.

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