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Junction (rail)
A junction, in the context of rail transport, is a place at which two or more rail routes converge or diverge. This implies a physical connection between the tracks of the two routes (assuming they are of the same gauge), provided by 'points' (US: switches) and signalling.
==Overview==
In a simple case where two routes with one or two tracks each meet at a junction, a fairly simple layout of tracks suffices to allow trains to transfer from one route to the other. More complicated junctions are needed to permit trains to travel in either direction after joining the new route, for example by providing a triangular track layout. In this latter case, the three points of the triangle may be given different names, for example using points of the compass as well as the name of the overall place.
Rail transport operations refer to stations that lie on or near a railway junction as a ''junction station''. In the UK it is customary for the junction (and the related station) to be named after the next station on the branch, e.g. Yeovil Junction is on the mainline railway south of Yeovil, and the next destination on the branch is Yeovil Pen Mill. Frequently, trains are built up and taken apart (separated) at such stations so that the same train can split up and go to multiple destinations. For goods trains (US: freight trains), marshalling yards (US: Classification yards) serve a similar purpose.
The world's first railway junction was Newton Junction (now Earlestown station) near Newton-le-Willows, England where, in 1831, two railways merged.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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