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Railway signalling equipment.

Railway signalling equipment.

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Mercury treadle, for detecting the arrival of trains, mounted on length of rail, 'RA' insulated pattern complete with plunger inserting tool, by Siemens General Electric, c. 1930.

Mercury treadle for detecting the arrival of trains

Combined lever lock and circuit controller

Combined lever lock and circuit controller

Multi-lamp route indicator with control relays

Multi-lamp route indicator with control relays

Gravity type lever lock

Gravity type lever lock

Section of all-electric locking frame

Section of All-Electric Locking Frame