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This article provides a list of operational and under construction (or approved) high-speed rail networks, listed by country or region. While the International Union of Railways defines high-speed rail as public transport by rail at speeds of at least 200 km/h (124 mph) for upgraded tracks and 250 km/h (155 mph) or faster for new tracks, this article lists all the systems and lines that ...
Most current PTC implementations also use the speed control unit to store a database of track profiles attached to some sort of navigation system. The unit keeps track of the train's position along the rail line and automatically enforces any speed restrictions as well as the maximum authorized speed.
Another design, with a third rail (current feed, outside the running rails) and fourth rail (current return, midway between the running rails), is used by a few steel-wheel systems; see fourth rail. The London Underground is the largest of these (see railway electrification in Great Britain).
A Pennsylvania Railroad position light signal bridge with replacement mast signals in the background. The design of steam locomotives meant that all signals had to be placed to the right of the running track. Current diesel engine design allows both left- and right-hand siting.
Train running on the Dale Creek Iron Viaduct in Wyoming, c. 1860 Railroads of the United States in 1918 An Atchison, Topeka and Santa Fe Railway freight train pauses at Cajon, California, in March 1943 to cool its braking equipment after descending Cajon Pass; the Interstate 15 of U.S. Route 66 is visible to the right of the train.
As the train moves, the contact shoe slides along the wire and can set up standing waves in the wires which break the contact and degrade current collection. This means that on some systems adjacent pantographs are not permitted. A Flexity Outlook LRV with its pantograph raised. Note the trolley pole in the rear, which provides compatibility ...
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This is a list of the operating passenger rail transit systems in the United States. This list does not include intercity rail services such as the Alaska Railroad or Amtrak and its state-sponsored subsidiaries. "Region" refers to the metropolitan area based around the city listed, where applicable. Operating Region State System Authority Type (FTA) Albuquerque New Mexico Rail Runner Express ...