| 单词 | third rail |
| 释义 | third rail Railroads. 1. a 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. an additional running rail laid on the same ties as the two regular rails of a railroad track to provide a multigauge capability. [1865-70, Amer.] |
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