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Threre are two basic types of overhead systems. Single wire and catenary. Single wire systems are low tension wires supported from the side and occasionally from above. Catenary refers to a two wire system that uses the curved top wire to support the bottom wire. These systems are more robust and generally used for high speed, heavy use areas using pantographs as pick ups. Single wire is most common in trolley systems using poles in lower speed urban settings. And of course there are tons of variants. <br /> <br />Many of us refer to any overhead wire as catenary......
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