Bell codes, buzzer codes or Communication Signal Appliance codes entail a series of bells or buzzers used on passenger trains for communication between the driver and guard.
Great Britain and India SignalMeaning in Great BritainMeaning in India1StopStop train1—1 Zone of speed restriction over, resume prescribed speed1—2Close doors2Ready to startStart train2—2Do not open doorsPassing automatic signal at 'on'3Set BackGuard required by driver3—1Lock central door locking3—2—1Testing doors3—3Guard required by driver, or guard or driver to speak on the telephoneGuard's warning when the motorman exceeds the speed prescribed3—3—1Release central door locking4Slow downProtect train in rear5Driver/Guard leaving the train6Draw forward9Police assistance required
All codes, except 3—2—1, must be acknowledged by repeating the code received.
Japan In Japan, these are known as In-Car Communication Signals (). Each code must be acknowledged by the receiver. Examples of common railway bell codes are:
SignalMeaning• • — • • Buzzer Test•Buzzer is OK—Am I clear to proceed?• • •The indicator light does not illuminate• •Prepare to stop at the next station•Acknowledgement for • •• • —Please correct your stopping position• —There is a problem• — •Secure the train and track— • • —Driver and conductor to confer— • —Power outageFast TappingCancel the last message sent
United States In the United States, these are known as Communication Signal Appliance codes.
SignalMeaning_When running, stop at once._When standing, apply or release brakes.o oWhen standing, start.o o oWhen standing or running backward, back up two car lengths.o o oWhen running forward, stop at next passenger station.o o o oWhen standing, brakes have applied and released on rear car. Brake test completed.oWhen spotting, switching, or making up trains, prepare to stop.
See also Whistle codes - used by locomotives to communicate with signal boxes
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