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

Signal Meaning in Great Britain[1] Meaning in India[2]
1StopStop train
1—1Zone of speed restriction over, resume prescribed speed
1—2Close doors
2Ready to startStart train
2—2Do not open doorsPassing automatic signal at 'on'
3Set BackGuard required by driver
3—1Lock central door locking
3—2—1Testing doors
3—3Guard required by driver, or guard or driver to speak on the telephoneGuard's warning when the motorman exceeds the speed prescribed
3—3—1Release central door locking
4Slow downProtect train in rear
5Driver/Guard leaving the train
6Draw forward
9Police assistance required

All codes, except 3—2—1, must be acknowledged by repeating the code received.

United States

In the United States, these are known as Communication Signal Appliance codes.

Signal Meaning[3]
_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

References

  1. "Preparation and movement of trains on ERTMS lines" (PDF). Rail Safety and Standards Board. p. 24. Archived from the original (PDF) on 31 December 2013. Retrieved 28 December 2013.
  2. "Chapter IV F. Duties of Staff Working Trains during Journey" (PDF). Indian Railways General Rules. South Eastern Railway. 2011. 4.51. Bell signals between Driver and Guard. Retrieved 7 February 2023.
  3. "Communicating Signal Appliance" (PDF). Northeast Operating Rules Advisory Committee. 2008. p. 29. Archived from the original (PDF) on 23 July 2011. Retrieved 9 April 2011.
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