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In British rail terminology, a loop or passing loop is 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 US terminology, the term " siding" covers this type of track section, in addition to other meanings.

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Topics: Loop (rail), Loop back, Loop Gain, Loop (knot), Loop...

LoopThe term loop in its general sense, refers to something that closes back on itself. It has been used in the following particular applications: A loop is one of the fundamental structures used to tie knots. See Loop (knot). In mathematics a loop is a quasi	Loop-backIn telecommunication, the term loop-back has the following meanings: 1. A method of performing transmission tests of access lines from the serving switching center, which method usually does not require the assistance of personnel at the served terminal.	Loop gainIn telecommunication, the term loop gain has the following meanings: 1. The total usable power gain of a carrier terminal or two-wire repeater. Note The maximum usable gain is determined by, and may not exceed, the losses in the closed path. The sum of th
Loop (knot)Knot theory A loop is one of the fundamental structures used to tie knots. A loop is not a knot itself but is used to build more secure knots. See also List of loop knots.	Loop (telecommunication)Hardware or software device which feeds the incoming signal or data back to the sender. Local loop is a telecommunications term for the " last mile" connection from the trunk to the subscriber. A modem can be configured to loop incoming signals from eithe	Loop quantum gravityLoop quantum gravity (LQG also known as loop gravity quantum geometry and canonical quantum general relativity, is a proposed quantum theory of spacetime which attempts to blend together the seemingly incompatible theories of quantum mechanics and general
Loopback	Looping	Loopback mount
Loop of Henle	Loop (Highway)	Loop invariant
Loop unswitching	Loop splitting	Loop fusion

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