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The lever frame is located in the signal box, which can be a building at ground level or a tower, separated from or connected to an existing station building. Early lever frames were also built as ground frames next to the track, without any form of shelter and were usually operated by traincrew and not permanently staffed. Especially in ...
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 ...
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 ...
It is a Midland Railway signal box dating from 1899, although the original mechanical lever frame has been replaced by electrical switches. Seen here in 2009. Seen here in 2009. On a rail transport system, signalling control is the process by which control is exercised over train movements by way of railway signals and block systems to ensure ...
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]
An axlebox, also known as a journal box in North America, is the mechanical subassembly on each end of the axles under a railway wagon, coach or locomotive; it contains bearings and thus transfers the wagon, coach or locomotive weight to the wheels and rails; the bearing design is typically oil-bathed plain bearings on older rolling stock, or roller bearings on newer rolling stock.
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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.
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