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A lineside board marking a gap in the supply.
Also known as: British power off board, Section gap marker
A British lineside board warning an electric train that the overhead supply is interrupted ahead and power must be shut off.
Warns that the overhead electrical supply is interrupted ahead and that power must be shut off before the gap is reached.
Contexts: Public information
Belongs to the electrification vocabulary rather than the signalling one, and is read by electric traction only, so a diesel driver passes it without acting on it.
Contexts: Public information
A rectangular lineside board carrying a plain device, placed in advance of the gap and again at its end.