Division 4.3.16 Public address system
United Kingdom
Trains shall be equipped with a means of communication:
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for the train crew and ground control to address the passengers in a train,
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for the train crew and ground control to communicate between one another, using the track to train link,
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for internal communication between the train crew, especially between the driver and staff in the passenger saloons.
The equipment shall be able remain on standby and function independent of the catenary supply for at least three hours.
The public address system shall be designed so as to operate 50 % of its loudspeakers in the event of a failure of one of the transmission elements.
Apart from the emergency alarm (see Section 4.2.12) no specific provisions are prescribed for passengers to contact train crew or ground control.