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| A '''crossover''' is a pair of ]es that connects two parallel ]s, allowing a train on one track to cross over to the other. When two crossovers are present in opposite directions, usually one after the other, the four-switch configuration is called a '''double crossover'''. If the crossovers overlap in the shape of the letter X, it is dubbed a '''scissors crossover''' or '''diamond crossover''' in reference to the ] in the center. | |||
| On a crowded system, routine use of crossovers (or switches in general) will reduce throughput, as the switches must be changed for each train. For this reason, on some high-capacity ] systems, crossovers between local and express tracks are not used during normal ] service, and service patterns are planned around use of the usually ] at each end of the local-express line. In a setup where each of the two tracks normally carries trains of only one direction, a crossover can be used either to detour "wrong-rail" around an obstruction or to reverse direction. A crossover can also join two tracks of the same direction, possibly a pair of local and express tracks, and allow trains to switch from one to the other. | |||
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Revision as of 21:48, 10 December 2006
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