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The first signals employed on an American railroad were a system of flags used on the Newcastle and Frenchtown Turnpike and Rail Road in the 1830s. The railroad then developed a more effective system consisting of wooden balls, painted red, white or black, and hoisted up or down a pole on a rope-and-pulley system.
Railroad Signalling: North American Signaling and Safety; Railroad Signaling and Communications – photos and info; North American Signaling; Railway Signalling and Operations FAQ; Mobile CROR Signal App. Can be used as a tool to help learn Canadian Railroad signals.
When a train is waiting at a signal it is "in rear of" that signal and the danger being protected by the signal is "in advance of" the train and signal. In North American practice, a distinction must be made between absolute signals, which can display a "Stop" (or "Stop and Stay") indication, and permissive signals, which display a "Stop ...
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.
SEPTA cab signal display for the 4-aspect PRR system using position light aspects. Pulse code cab signaling is a form of cab signaling technology developed in the United States by the Union Switch and Signal corporation for the Pennsylvania Railroad in the 1920s.
A single lamp attached to wayside signals with a "C" plate bolted to it. The aspect is Rule 280a - Clear to Next Interlocking. This aspect is only seen in the Eastern United States on rail lines operating Cab Signal Systems. Cab signal lines only have wayside signals at interlockings and diamonds.
Centralized traffic control (CTC) is a form of railway signalling that originated in North America. CTC consolidates train routing decisions that were previously carried out by local signal operators or the train crews themselves.
In some regions, notably North America, the terms distant signal and approach signal are both in common usage. Because of the long distance required to bring a moving train to a stand, distant signals must be located on the approach to the corresponding stop signal by at least the braking distance of the worst braked train to use the route.