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In the simplest case with three signal boxes on a stretch of line without junctions, the central of the three boxes will receive a request for a train to be accepted, the signaller will set any relevant points (turnouts) and signals and signal acceptance, and then request acceptance by the next signal box along the line.
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.
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The software is currently produced by SoftRail (formerly Signal Computer Consultants) for Windows-based computers. The simulator is operated from the perspective of a CTC dispatcher. Track diagrams similar to actual CTC displays are provided, and train operations run according to a timetable. Operations can be run in real time or adjusted fast ...
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Automatic block signaling (ABS), spelled automatic block signalling or called track circuit block (TCB [1]) in the UK, is a railroad communications system that consists of a series of signals that divide a railway line into a series of sections, called blocks. The system controls the movement of trains between the blocks using automatic signals.
A block section is normally the section of track from the most advanced signal controlled by the signal box in rear, and the rearmost signal controlled by the signal box in advance. Because many signal boxes are at stations, the last signal controlled by the rear box is called the starter signal , whether or not there is a station at which ...