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Three white lights in a triangle.
Also known as: Ersatzsignal, Substitute signal
The German auxiliary signal Zs 1, three white lights in a triangle, authorising a train to pass a main signal that cannot be cleared.
Authorises a train to pass a main signal that has failed or cannot be cleared, at a restricted speed.
Contexts: Public information
Exists so that a defective signal does not stop the railway, while keeping the failed main aspect at its most restrictive indication throughout.
Contexts: Public information
Three lit lamps arranged as a triangle above the main signal head.