Last update 15 January 2021
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Historically, there was limited communication between drivers and guards. To provide concise communication, a series of codes tapped out on a buzzer was developed. Although nowadays it is more than likely that drivers and guards can talk directly through a telephone system, the codes are retained because each message has a very specific meaning. In a safety-critical environment, their use prevents misunderstanding. When used, the buzzer message must be repeated back to the sender by the recipient to signify full understanding of the message. The most common code likely to be heard by the passenger will be the guard sending '2' (ready to start) to the driver, who then repeats back '2' to the guard and starts the train.
number of buzzes or groups separated by pauses
|2||Ready to start|
|2-2||Do not open doors|
|3-1||Lock central door locking|
|3-3||Driver/guard required to attend telephone (or Loudaphone, etc.)|
|3-3-1||Release central door locking|
|5||Driver/guard leaving the train|
|9||Police assistance required|