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Encyclopedia > Passing loop

In rail terminology, a loop can mean one of two configurations: Rail terminology is a form of technical terminology. ...

  • a stretch of rail track that provides a place for a train to halt temporarily while other trains pass on an adjacent main line . This configuration allows the sequence of trains along a track to change. The feature is common on single-track and busy double track railways throughout Britain and Ireland. In the US this sort of track is called a siding: in Britain, a passing loop.
  • a railway line which describes a loop, or part thereof, sometimes allowing trains to return to the start point by a different route. Examples in England are the Dartford Loop in south east London and the Hounslow Loop in west London. The same term is used in Australia: examples there being the City Loop in Melbourne or the Ekka Loop in Brisbane. Sydney's underground system is known as the City Circle. Similarly, in US terminology, a loop is a section of track which curves back onto itself to allow trains to change direction. This is less common than a wye track.

A spiral loop is a 360° turn used to gain height in a relative small space, used in railway construction in mountainous areas. Railroad or railway tracks are used on railways, which, together with railroad switches (points), guide trains without the need for steering. ... There are various types of trains designed for particular purposes, see rail transport operations. ... A siding, in general rail terminology, refers to a section of rail used to store stationary rolling stock perhaps whilst it is loaded or unloaded, or alternatively, a short length of rail that provides access to and from factories, mines, quarries, wharves, etc. ... Royal motto: Dieu et mon droit (French: God and my right) Englands location within the UK Official language English de facto Capital London de facto Largest city London Area  - Total Ranked 1st UK 130,395 km² Population  - Total (2001)  - Density Ranked 1st UK 49,138,831 377/km² Ethnicity... The Dartford Loop Line is one of three lines linking London with Dartford in Kent, England. ... Hounslow railway station is in the London Borough of Hounslow, in west London, and is in Travelcard Zone 5. ... Problems and solutions Prior to the construction of the Loop, Flinders Street and Spencer Street stations were connected only by a viaduct beside the Yarra River. ... The Exhibition line is a special-purpose railway line in Brisbane, Australia. ... The City Circle is a system of underground passenger railway lines located in Sydney, New South Wales, Australia that make up the heart of the Sydney passenger railway network, owned and operated by CityRail, a New South Wales government agency. ... A wye in American railroad terminology, known as a triangle in British terminology, is a triangular shaped arrangement of tracks with a switch at each corner. ...


See Also

A crossing loop is a place on a single line railway where trains in opposing directions can cross each other. ...

External links

  • Spiral loop railway in Australia
  • the Kalka-Shimla Railway in India

  Results from FactBites:
 
Knots and Ropework - Printer-friendly - MSN Encarta (694 words)
The figure-eight knot, made by doubling the end of a rope to form a loop and passing the free end around and under the standing part and then through the loop, is the most decorative of all simple knots.
The loops of the square bow knot are parallel to the standing part of the knot, whereas the loops of the granny bow knot are perpendicular to the standing part.
It is made by forming a loop in the rope some distance from the end and then passing the end of the rope through the loop, around the standing part, and back through the loop.
Doug's R-E Loop Article Page (3687 words)
Loop antennas, when used at low frequencies, are subject to that effect because their size is aonly a fraction of a wavelength, and they pick up interference from a signal derived from the electric, rather than the magnetic, field.
A mobius loop is one where the coil is "twisted" so that (except at the start/finish point where the wires cross) all the "even-numbered" turns are adjacent to one another, with the same being true for the "odd-numbered" turns.
A loop with a center-tapped winding is often used together with a preamp with a balanced input, but there is a better way of winding loops on long ferrite rods that also reduces the inductance of the whole winding and results in a single-ended termination for the loop.
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