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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 manually operated two-lever ground frame, signals and points are also significant as examples of mechanical signalling technology. [ 1 ] The system of interlocked signals is surviving evidence of the former size and complexity of the Charters Towers railway station and yards.
In many countries, levers are painted according to their function, e.g. red for stop signals and black for points, and are usually numbered, from left to right, for identification. In most cases, a diagram of the track and signaling layout is mounted above the lever frame, showing the relevant lever numbers adjacent to the signals and points.
The lever is operated by applying an input force F A at a point A located by the coordinate vector r A on the bar. The lever then exerts an output force F B at the point B located by r B. The rotation of the lever about the fulcrum P is defined by the rotation angle θ in radians. Archimedes lever, Engraving from Mechanics Magazine, published ...
North British Railway Type 7 signal box with Stevens & Sons lever frame. [38] Spean Bridge: C: Highland: 1949: Listed with the railway station, the signal box is a 1945 design London and North Eastern Railway Type 15 built by British Rail Scottish Region. The Stevens & Sons 30-lever frame has been removed. [39] St Fillans: B: Perth and Kinross
If the lever is free to move based on the locking bed, contacts on the levers actuate the switches and signals which are operated electrically or electro-pneumatically. Before a control lever may be moved into a position which would release other levers, a signal must be received from the field element that it has actually moved into the ...
Around 1860, when Beugniot was the chief engineer at the firm of André Koechlin & Cie. in Mulhouse, he developed a system whereby wheelsets are housed in pairs in the locomotive frame, with side-play, and connected by a lever. These levers are fixed to the frame in the centre and thus enable the sideways movement of the connected axles in ...
Down Main Lines and Chester side of the frame. Crewe North Junction signal box is signal box with a Westinghouse All Electric Style 'L' lever frame which was commissioned, along with Crewe South Junction signal box (which also had a Westinghouse Style 'L' frame), on 29 March 1940 as part of a resignalling project at Crewe railway station.