... towing train 串联拖驳队 track construction train 铺轨列车 track laying train 铺轨列车 ...
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track construction train
轨道施工列车
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Much of the work is expected to be carried out at night, with a so-called factory train laying a mile of new track and cables every night once construction is underway.
BBC: Electrification of Swansea to London trains 'by 2018'
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