Abstract: A railroad car hand brake signal device alerts a train crew when a rail car hand brake is set and air is supplied to the brake pipe during operation of the train. If a rail car hand brake remains applied when air is supplied to the train's brake pipe, a whistle is sounded to enable the crew to identify the car having a set hand brake and a leakage path is provided to cause the air pressure in the brake pipe to fall to alert the train crew in the locomotive that a hand brake is set.
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