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Track lighting is a method of lighting where light fixtures are attached anywhere on a continuous track device which contains electrical conductors. [1][2] This is in contrast to directly routing electrical wiring to individual light positions. Tracks can either be mounted to ceilings or walls, lengthwise down beams, or across rafters or joists ...
Light fixture. A light fixture (US English), light fitting (UK English), or luminaire is an electrical lighting device containing one or more light sources, such as lamps, and all the accessory components required for its operation to provide illumination to the environment. [1] All light fixtures have a fixture body and one or more lamps.
The basic principle behind the track circuit lies in the connection of the two rails by the wheels and axle of locomotives and rolling stock to short an electrical circuit. This circuit is monitored by electrical equipment to detect the absence of the trains. Since this is a safety appliance, fail-safe operation is crucial.
There are two main types of signaling aspect systems found in North America, speed signaling and weak route signaling. [citation needed] Speed signaling transmits information regarding how fast the train is permitted to be going in the upcoming segment of track; weak route signaling transmits information related to the route a train will be taking through a junction, and it is incumbent upon ...
A railway track (British English and UIC terminology) or railroad track (American English), also known as a train track or permanent way (often "perway" [1] in Australia or "P Way" in Britain [2]), is the structure on a railway or railroad consisting of the rails, fasteners, railroad ties (sleepers, British English) and ballast (or slab track ...
According to Network Rail, the trackbed is the layers of ballast and sub-ballast above a prepared subgrade /formation (see diagram). It is designed primarily to reduce the stress on the subgrade. Other definitions include the surface of the ballast on which the track is laid, [1] the area left after a track has been dismantled and the ballast ...
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