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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 North America, a set of signalling appliances and tracks interlocked together are sometimes collectively referred to as an interlocking plant or just as an interlocking. An interlocking system is designed so that it is impossible to display a signal to proceed unless the route to be used is proven safe.
Key to the concept of CTC is the notion of traffic control as it applies to North American railroads. Trains moving in opposite directions on the same track cannot pass each other without special infrastructure such as sidings and switches that allow one of the trains to move out of the way. Initially, the only two ways for trains to arrange ...
North American practice meant that train crews generally received their orders at the next station at which they stopped, or were sometimes handed up to a locomotive 'on the run' via a long staff. Train orders allowed dispatchers to set up meets at sidings, force a train to wait in a siding for a priority train to pass, and to maintain at least ...
This is a list of major infrastructure on the Northeast Corridor, a rail line running through the Northeastern United States.The list includes major interlockings, bridges, tunnels, and past and present stations, including the Massachusetts Bay Transportation Authority's Orange Line, the Washington Metro's Orange Line, and PATH stations on separate tracks but sharing the right-of-way.
Harold Interlocking and Sunnyside Yard in 1977. Harold Interlocking is a large railroad junction in New York City.The busiest rail junction in the United States, [1] it serves trains on Amtrak's Northeast Corridor and the Long Island Rail Road's Main Line and Port Washington Branch, which diverge at the junction.
A CIP consists of 3 main processor modules which perform the safety-critical interlocking functionality. In addition it possesses two communications modules which provide redundant Ethernet connectivity (duplicated for availability) and two digital input modules (duplicated for availability) which can service up to 32 local inputs.
Communication between interlockings and TFMs is by electronic data packages termed 'telegrams'. Telegrams are transmitted via 'data links', comprising twisted pair copper cable. The data links are duplicated for availability. A 'data link module' (DLM) is the interface between the data link and the TFMs. A DLM has a blue label.