Bell codes or Buzzer codes (US Communication Signal Appliance codes) are a series of bells or buzzers used on passenger trains for communication between the driver and guard.
Bell codes or Buzzer codes (US Communication Signal Appliance codes) are a series of bells or buzzers used on passenger trains for communication between the driver and guard. (en)
Bell codes or Buzzer codes (US Communication Signal Appliance codes) are a series of bells or buzzers used on passenger trains for communication between the driver and guard. (en)