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.
Signal | Meaning in Great Britain [1] | Meaning in India [2] |
---|---|---|
1 | Stop | Stop train |
1—1 | Zone of speed restriction over, resume prescribed speed | |
1—2 | Close doors | |
2 | Ready to start | Start train |
2—2 | Do not open doors | Passing automatic signal at 'on' |
3 | Set Back | Guard required by driver |
3—1 | Lock central door locking | |
3—2—1 | Testing doors | |
3—3 | Guard required by driver, or guard or driver to speak on the telephone | Guard's warning when the motorman exceeds the speed prescribed |
3—3—1 | Release central door locking | |
4 | Slow down | Protect train in rear |
5 | Driver/Guard leaving the train | |
6 | Draw forward | |
9 | Police assistance required |
All codes, except 3—2—1, must be acknowledged by repeating the code received.
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 o | When standing, start. |
o o o | When standing or running backward, back up two car lengths. |
o o o | When running forward, stop at next passenger station. |
o o o o | When standing, brakes have applied and released on rear car. Brake test completed. |
o | When spotting, switching, or making up trains, prepare to stop. |