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单词 third rail
释义

WordReference Random House Unabridged Dictionary of American English © 2024
third rail, [Railroads.]
  1. Rail Transporta rail laid parallel and adjacent to the running rails of an electrified railroad to provide electric current to the motors of a car or locomotive through contact shoes.
  2. Rail Transportan additional running rail laid on the same ties as the two regular rails of a railroad track to provide a multigauge capability.
  • 1865–70, American.

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