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In railway signalling, an interlocking is an arrangement of signal apparatus that prevents conflicting movements through an arrangement of tracks such as junctions or crossings. In North America, a set of signalling appliances and tracks interlocked together are sometimes collectively referred to as an interlocking plant or just as an ...
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.
Computer-based interlocking is railway signal interlocking implemented with computers, rather than using older technologies such as relays or mechanics. General
Signal box and tracks at Deval interlocking, Des Plaines, in 1993 Originally, all signaling was done by mechanical means.Points and signals were operated locally from individual levers or handles, requiring the signalman to walk between the various pieces of equipment to set them in the required position for each train that passed.
On these lines the clearance of the controlled branch entry signal is the driver's sole authority to enter the branch, and once the train has passed that signal, the interlocking will hold it at 'danger' (and the signal cannot be cleared a subsequent time) until the branch service train, on its return journey has sequentially operated two track ...
Interlocking is an arrangement of signal apparatus that prevents conflicting movements through an arrangement of tracks such as junctions or crossings. On the London Underground signals and points are operated and controlled by an array of electrical, pneumatic and mechanical components. [ 1 ]
A GEC-manufactured SSI interlocking cubicle. Solid State Interlocking (SSI) is the brand name of the first generation processor-based interlocking developed in the 1980s by British Rail's Research Division, GEC-General Signal and Westinghouse Signals Ltd in the UK.
EULYNX stems from the shorter lifetime of new signalling equipment technology, especially of interlockings which are at the core of the railway safety system. [2] An interlocking system using mechanical technology could be expected to last up to 80 years but electronic interlocking equipment has a shorter lifetime, between 15 and 20 years. [3]