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A board requiring traction power to be shut off.
Also known as: Ausschaltsignal, German power off board
The German board El 1, requiring an electric train to shut off traction power before an insulated section.
Requires an electric train to shut off traction power before an insulated section of overhead line.
Contexts: Public information
Belongs to the El family, which addresses electric traction only, so the same board is acted on by one train and ignored by the next.
Contexts: Public information
A rectangular plate carrying a diagonal device, placed before the section it protects.