Miscellaneous Indicators
- Off Indicator
- An illuminated off indication means the associated signal is showing a proceed aspect. These are mainly used at stations, for the benefit of the train-crew and platform staff. When the display is blank, it means that the associated signal is at danger.
An illuminated indication CD (close doors) is an instruction to close the train's power-operated doors.
An illuminated indication RA or R (right away) means that station duties are complete and the train may depart.
Read more about this topic: British Railway Signals