... deadhead train 无偿列车（如路务列车）；回送列车 dead-heading train 无偿列车（如路务列车）；回送列车 detoured train 迂回列车 ...
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dead-heading train
放空的火车
以上为机器翻译结果，长、整句建议使用 人工翻译 。
On a fog-shrouded evening on the penultimate day of 1906, a dead-heading train roared down this stretch of tracks near Washington's Catholic University, coming upon a slower passenger train heading the same direction on the same track.
CNN: Welcome to obscure Washington, D.C.
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