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A mechanical lever frame inside the signal box at Knockcroghery in Ireland Waterloo station A signalbox, LSWR (Howden, Boys' Book of Locomotives, 1907). Mechanical railway signalling installations rely on lever frames for their operation to interlock the signals, track locks [1] and points to allow the safe operation of trains in the area the signals control.
The points at the north-west end of the loop are controlled by a 3-lever ground frame known as Manuel North. The east-facing link line is controlled by a 5-lever ground frame which includes mechanical control of two signals: a raised yellow disc signal reads up the link line and up onto Network Rail and a small arm signal prevents moves onto ...
The lever and its accompanying hardware is usually mounted to a pair of long ties (sleepers) that extend from the switch at the points. They are often used in a place of a switch motor on less frequently used switches. In some places, the lever may be some distance from the points, as part of a lever frame or ground frame. To prevent the ...
Groundframe, with the two rightmost levers locked by Annett's key. In British, Australian, French, and Swiss railway signalling, an Annett's key is a form of trapped-key interlocking that locks levers or other items of signalling apparatus, thereby serving as a portable form of interlocking.
This immobilises the signal frame levers, and the key can be used to unlock a smaller mechanical ground frame to the north-east of the station. This key lockout system is rare. The ground frame at Charters Towers, north-east of the station, has two levers on a small metal platform, and is used to control access to a siding. [1]
Another three-point locking system is commonly used in lockers. [5] This system uses a "Latch Channel" with 3 vertical slots that attach to 3 hooks on the locker frame. The locker handle is attached directly to the latch channel so that when the channel is lifted, it is released from the hooks and the door is allowed to swing open.
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Power frames have miniature levers and control the signals and points electrically. In some cases, the interlocking was still done mechanically, but in others, electric lever locks were used. In a few cases, signals and points were operated pneumatically upon operation of the appropriate lever or slide.
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