track 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 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 For Life — (often shortened to Relay) is a fundraising event of the American Cancer Society, and is now held in many other countries. It is an overnight event designed to spread awareness of cancer prevention, treatments and cures, celebrate survivorship… …   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

• Track and Field Sports (Athletics) — ▪ 2009 Introduction       Jamaican sprinter Usain Bolt (Bolt, Usain ) stamped his name on the 2008 track and field season, breaking world records four times, three of them in spectacular fashion at the Olympic Games in Beijing. Bolt was far from… …   Universalium

• relay race — Sports. a race between two or more teams of contestants, each contestant being relieved by a teammate after running part of the distance. Cf. medley relay. [1895 1900] * * * Race between teams in which each team member successively covers a… …   Universalium

• 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 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

• relay — I. noun Etymology: Middle English, set of fresh hounds, from relayen Date: 1651 1. a. a supply (as of horses) arranged beforehand for successive relief b. a number of persons who relieve others in some work < worked in relays around the clock > 2 …   New Collegiate Dictionary