Guard's Door Control Panels
Behind the cab, in the vestibules next to the exterior doors are 'Guard's Door Control Panels'.
These are only energised when the Guard has unlocked the Door Key switch in the adjacent cab.
Using these control panels the guard can release or close the doors on that side of the train.
The circular light at the top was originally the door interlock light, but this is no longer in use.
The green signal buzzer is only active when the all doors are closed and the door interlock circuit is complete.
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