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conduit current collection
Conduit current collection is a system of electric current collection used by electric tramways, where the power supply was carried in a channel under the roadway.
==Description==
The power rails for conduit are contained in a vault between and underneath the running rails,in much the same fashion as the cable for cable cars. The vault contains two "T" section steel power rails of opposite polarity facing each other, about apart and about below the street surface. Power reached the car by means of an attachment, called a plough (US - plow), that rode in the conduit beneath the car. The plough had two metal shoes attached to springs that pushed sideways against the power rails. The plough was normally connected to a platform that could slide laterally to conform with variations in the placement of the conduit, for example in some areas there was a conduit for cable cars adjacent to the one for electric cars.
The current was carried by a flexible cable from the plough through the platform to the car's controller and motor(s). The running rails are not part of the electrical circuit. In the United States, the cars were sometimes popularly but incorrectly called trolleys but did not typically draw power through a trolley pole from an overhead wire as (strictly defined) trolley cars do.
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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