open-track-circuit relay
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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
Track circuit interrupter — A track circuit interrupter may be fitted at catch points, trap points or buffer stops to maintain a track circuit in the occupied state in the event of a derailment. The track circuit remains de energised until the interrupter is replaced.… … Wikipedia
Track and field athletics — Track and field athletics, commonly known as athletics or track and field, is a collection of sports events that involve running, throwing and jumping. The name athletics is derived from the Greek word athlos meaning contest . HistoryThe original … Wikipedia
Relay — This article is about the electrical component. For other uses, see Relay (disambiguation). Automotive style miniature relay, dust cover is taken off A relay is an electrically operated switch. Many relays use an electromagnet to operate a… … Wikipedia
Track and Field Sports — ▪ 2007 Introduction World Indoor Championships. At the International Association of Athletics Federations (IAAF) world indoor championships, held in Moscow on March 10–12, 2006, Russia and the U.S. divided up a majority share of the gold… … Universalium
Track and field — For the video game, see Track Field (video game). Track and field The track and field stadium is at the heart of the sport Nickname(s) Track Characteristics Team mem … Wikipedia
Relay race — During a relay race, members of a team take turns running, orienteering, swimming, cross country skiing, biathlon, or skating (usually with a baton in the first) parts of a circuit or performing a certain action. Relay races take the form of… … Wikipedia
2008 Summer Olympics torch relay — 2008 Summer Olympics Bid process Venues Marketing Concerns and controversies Torch relay (route) Opening ceremony (flag bearers) Medal table (medalists) Closing ceremony Event calendar … Wikipedia
Railway accidents in New South Wales — The railways of New South Wales, Australia have had several incidents and accidents since their formation in 1831.Accidents involving loss of lifeLocomotive No.1, 1858This locomotive, built in 1855 by Robert Stephenson with three others for the… … Wikipedia
railroad — /rayl rohd /, n. 1. a permanent road laid with rails, commonly in one or more pairs of continuous lines forming a track or tracks, on which locomotives and cars are run for the transportation of passengers, freight, and mail. 2. an entire system… … Universalium
Marathon — For other uses, see Marathon (disambiguation). Competitors during the 2007 Berlin Marathon … Wikipedia
