unoccupied track
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Track circuit — A track circuit is a simple electrical device used to detect the presence or absence of a train on rail tracks, used to inform signallers and control relevant signals. Principles and operation The basic principle behind the track circuit lies in… … Wikipedia
TGV — The TGV ( train à grande vitesse , French for high speed train ) is France s high speed rail service developed by GEC Alsthom (now Alstom) and SNCF, the French national rail operator, and operated primarily by SNCF. Following the inaugural TGV… … Wikipedia
Battle of Hat Dich — Part of the Vietnam War … Wikipedia
Admiralty Islands campaign — Admiralty Islands Part of World War II, Pacific War … Wikipedia
Comparison of Axis & Allies Games — Axis Allies is a series of board wargames by Larry Harris, which was originally produced by Nova Game Designs in 1981 and later by Milton Bradley in 1984 and by Avalon Hill since 1999. Avalon Hill is owned by Wizards of the Coast. Since the… … Wikipedia
United States — a republic in the N Western Hemisphere comprising 48 conterminous states, the District of Columbia, and Alaska in North America, and Hawaii in the N Pacific. 267,954,767; conterminous United States, 3,022,387 sq. mi. (7,827,982 sq. km); with… … Universalium
Squatting — Squatter redirects here. For other uses, see Squat (disambiguation). For the resting position, where the weight of the body is on the feet, see squatting position. Part of the Politics series on … Wikipedia
Mir — This article is about the Soviet/Russian space station. For other uses, see Mir (disambiguation). Mir … Wikipedia
Medway watermills (middle tributaries) — For an explanation of the various pieces of machinery mentioned, see Mill machinery. River Medway (Middle Tributaries) Legend … Wikipedia
Railway signalling — Not to be confused with Railway signal. A gantry of British semaphore signals seen from the cab of a steam locomotive Railway signalling is a system used to control railway traffic safely, essentially to prevent trains from colliding. Being… … Wikipedia
Centralized traffic control — (CTC) is a signalling system used by railroads. The system consists of a centralized train dispatcher s office that controls railroad switches in the CTC territory and the signals that railroad engineers must obey in order to keep the traffic… … Wikipedia
