Feature is available on all driver only operated trains. Exists on the DART fleet, and should exist on all 22, 26, 27, 28, 29k as well as Mk3 push pull and might work on the Enterprise and Mk4 trains.
I've never experienced it being used, then again it would be somewhat hard to tell. The great feature is the PA can be made on all trains within a certain area.
The CTC to all drivers function is used daily, you can overhear it. Most of the time the message is could the driver of the train in platform X in Y contact me. Of course the drivers rarely pass the message on when problems arise.
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