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Left to right: up loop; up main (where the first collision occurred); down main; down loop. The signal box was on the outside of the up loop. The disaster occurred at Quintinshill signal box, which was an intermediate box in a remote location, sited to control two passing loops, one on each side of the double-track main line of the Caledonian ...
Hebden Bridge signal box A number of signal boxes in England are on the Statutory List of Buildings of Special Architectural or Historic Interest. Signal boxes house the signalman and equipment that control the railway points and signals. Originally, railway signals were controlled from a hut on a platform at junctions. In the 1850s, a raised building with a glazed upper storey containing ...
Stirling North signal box A number of signal boxes in Scotland are on the Statutory List of Buildings of Special Architectural or Historic Interest. Signal boxes house the signalman and equipment that control the railway points and signals. Originally railway signals were controlled from a hut on a platform at junctions, but by the 1860s this had developed into a raised building with a glazed ...
A particular signal box may control one or more stop signals on each running line. In a traditional mechanically signalled area in the United Kingdom, it is most common for a signal box to have two stop signals governing each line. The first reached by a train is known as the home signal.
a 'block free' signal (green), meaning that the next block is clear or, in the case of a distant signal, that the next signal is also green; Warning signals or speed limits (yellow) requiring the driver to slow the train and especially to be able to stop before the next stop signal; Stop signals (red) require the train to stop.
The signal box provided a dry, climate-controlled space for the complex interlocking mechanics and also the signalman. The raised design of most signal boxes (which gave rise to the term "tower" in North America) also provided the signalman with a good view of the railway under his control. The first use of a signal box was by the London ...
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