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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. Interlocking is a safety measure designed to prevent signals and points/switches from being changed in an improper sequence. For example, interlocking would prevent a signal from being changed to indicate a ...
North American signals are commonly of three types. Absolute – Absolute signals are usually connected to an interlocking controlled by a block operator or train dispatcher. Their most restrictive aspect is "stop" and trains cannot pass them at stop unless they obtain special authority.
The New York City Subway system has, for the most part, used block signalingsince its 1904 opening. As of May 2014[update], the system consists of about 14,850 signal blocks, 3,538 mainline switches, 183 major track junctions, 10,104 automatic train stops, and 339,191 signal relays.[2]
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. The system consists of a centralized train dispatcher 's office that controls railroad interlockings and traffic ...
Union Switch & Signal (commonly referred to as US&S) was an American company based in Pittsburgh, Pennsylvania, which focused on railway signaling equipment, systems and services. The company was acquired by Ansaldo STS (from 2015, Hitachi Rail STS ) in 1988, [ 1 ] operating as a wholly-owned company until January 2009, when US&S was renamed ...
An interlock is a feature that makes the state of two mechanisms or functions mutually dependent. It may consist of any electrical or mechanical devices, or systems. In most applications, an interlock is used to help prevent any damage to the machine or to the operator handling the machine.
Self-driving car. Unmanned surface vehicle. v. t. e. Communications-based train control (CBTC) is a railway signaling system that uses telecommunications between the train and track equipment for traffic management and infrastructure control. CBTC allows a train's position to be known more accurately than with traditional signaling systems.
The Chicago and Western Indiana Railroad operated an extensive number of interlocking tower system on its system. From the north, towers were as follows: 12th Street tower, 15th Street tower, 16th Street tower, 21st Street tower, 40th Street tower, 47th Street tower, Ford Street tower (59th Street), 74th Street tower, 81st Street tower, Oakdale (later remote controlled by 81st Street), Pullman ...