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Railway signalling (BE), or railroad signaling (AE), is a system used to control the movement of railway traffic. Trains move on fixed rails , making them uniquely susceptible to collision . This susceptibility is exacerbated by the enormous weight and inertia of a train, which makes it difficult to quickly stop when encountering an obstacle.
Standards for North American railroad signaling in the United States are issued by the Association of American Railroads (AAR), which is a trade association of the railroads of Canada, the US, and Mexico. Their system is loosely based on practices developed in the United Kingdom during the early years of railway development. However, North ...
It was superseded by the modular rulebook following re-privatisation of the railways. [1] [2] It survives, very differently named: the driver of a train waiting at a signal on a running line must remind the signaller of its presence. [3] Inside a signal box on the Isle of Wight Steam Railway. The wooden collar on the third lever is in place to ...
Semaphore to CTC: Signalling and train working in New Zealand, 1863–1993. Wellington: New Zealand Railway and Locomotive Society. ISBN 0-908573-76-6. Vanns, Michael A (1997): An Illustrated History of Signalling. Ian Allan Publishing, Shepperton, England.
A British Upper Quadrant semaphore signal. In the days of the first British railways, "policemen" were employed by every railway company. Their jobs were many and varied, but one of their key roles was the giving of hand signals to inform engine drivers as to the state of the line ahead. [3]
CTC consolidates train routing decisions that were previously carried out by local signal operators or the train crews themselves. The system consists of a centralized train dispatcher's office that controls railroad interlockings and traffic flows in portions of the rail system designated as CTC territory. One hallmark of CTC is a control ...
In general, the signalling device comprises: 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;
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 that trains operate safely, over the correct route and to the proper timetable.