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The vertical light bar in the middle of the signal indicates the maximum permitted speed for the section of track where the lead car is currently located. Cab signaling is a railway safety system that communicates track status and condition information to the cab, crew compartment or driver's compartment of a locomotive, railcar or multiple unit.
There are two main types of signaling aspect systems found in North America, speed signaling and weak route signaling. [citation needed] Speed signaling transmits information regarding how fast the train is permitted to be going in the upcoming segment of track; weak route signaling transmits information related to the route a train will be taking through a junction, and it is incumbent upon ...
In Track Warrant Control, or TWC, the train dispatcher issues "track warrants" via radio that authorize the train between two specified limits. The limits are often mileposts or stations. The track warrant may authorize a train to proceed to a station and "clear the main", or enter a siding so an oncoming train can pass.
Track gauge; Service and rolling stock; Bogie (truck) Couplings; Freight; ... This is the list of rail accident lists. Lists. By year. Before 1880; 1880–1889; 1890 ...
Signals in CTC territory are one of two types: an absolute signal, which is directly controlled by the train dispatcher and helps design the limits of a control point, or an intermediate signal, which is automatically controlled by the conditions of the track in that signal's block and by the condition of the following signal. Train dispatchers ...
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.
1972 Chicago commuter rail crash, Chicago, Illinois; 45 killed plus hundreds injured [192] [193] [194] 1973 Littlefield, Texas bus/train crash; 7 killed plus 16 injured [195] [196] 1974 Decatur tank car explosion, Decatur, Illinois; 7 killed plus hundreds injured [197] [198] 1976 1976 Beckemeyer train accident, 12 killed and four injured.
A rail break between the insulated rail joint and the track circuit feed wiring would not be detected. Failure modes that result in an incorrect "track clear" signal (known usually in North America as a "false clear") may allow a train to enter an occupied block, creating the risk of a collision. Wheel scale and short trains may also be a problem.