Automatic train control in rail rapid transitby United States. Congress. Office of
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Original publisher: [Washington, D.C.] : U.S. Congress, Office of Technology Assessment : for sale by the Supt. of Docs., U.S. Govt. Print. Off., . LC Number: TF845 .U53 1976 OCLC Number: (OCoLC)02344493 Subject: Subways — Automatic control. Excerpt: ... 2 Definitions Train Control - the process by which the movement of rail rapid transit vehicles is regulated for the purposes of safety and effi-ciency. The system that accomplishes train control performs four types of functions: Train Protection-assurance that trains maintain a safe following distance, that overspeed is prevented, and that conflicting movements at junctions, crossings, and switches are precluded; Train Operation—control of train movements - specifically regulating speed, stopping at stations, and opening and closing doors; Train Supervision-assignment of routes, dispatch of trains, and maintaining or adjusting schedule; Communication - interchange of command and status infor-mation among trains, wayside elements, stations, and central control. Automatic Train Control ( ATC ) - the use of machines to perform all or most of the functions of train control in the normal mode of operation. Human involvement in ATC systems consists mainly of monitoring and back-up. The acronyms ATP ( automatic train pro-tection ), ATO ( automatic train operation ), and ATS ( automatic train supervision ) denote particular groups of automated func-tions. Rail Rapid Transit-an electrified rail system operating in urban areas on exclusive rights-of-way. Rail rapid transit is considered here to exclude commuter railroad systems and light rail systems, although the technology of train control is similar for all three. of train in Appendix D. Explanation of the fundamentals ZA glossary control terms is presented of train control and descriptions of typical train control equipment are contained in Chapter 3.