Third rail

Paris Metro. The guiding rails of the rubber-tyred lines are also current conductors. The horizontal current collector is between the pair of rubber wheels.

London Stansted Airport people mover with central rail power feed

A third rail is a method of providing electric power to a railway train, through a semi-continuous rigid conductor placed alongside or between the rails of a railway track. It is used typically in a mass transit or rapid transit system, which has alignments in its own corridors, fully or almost fully segregated from the outside environment. Third rail systems are always supplied from direct current electricity.

单词	Conductor Rail
释义	Conductor Rail 英语百科 Third rail A third rail is a method of providing electric power to a railway train, through a semi-continuous rigid conductor placed alongside or between the rails of a railway track. It is used typically in a mass transit or rapid transit system, which has alignments in its own corridors, fully or almost fully segregated from the outside environment. Third rail systems are always supplied from direct current electricity.
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Conductor Rail

Third rail