Lever frame
Videos
Mechanical railway signalling installations rely on lever frames for their operation to interlock the signals, track locks and points to allow the safe operation of trains in the area the signals cont
A mechanical lever frame inside the signal box at Knockcroghery in Ireland
Waterloo station A signalbox, LSWR (Howden, Boys' Book of Locomotives, 1907)
Lever frame of the signal box Hausen im Tal, Germany: the signals are operated by the red levers, black levers with Arabic numerals are for points and blue levers with Roman numerals are for track locks. The box on the right of the lever frame is used for manual block signalling; the smaller green levers are used for operating the route locks. The interlocking apparatus is in the box behind the levers.
A three-lever ground frame at Kyle of Lochalsh, released by Annett's key