However, a law in the 19th century forced railway companies to run one cheap train a day which stopped at every station and cost only a penny a mile.

然而，19世纪的一项法律强制铁路公司每天开一趟便宜的火车，这种火车在每个车站都停，每英里只花一便士。

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The train operates the 2,400-mile round trip once a week.

这列火车每周进行一次2400英里的往返旅行。

《柯林斯英汉双解大词典》

For someone just starting to train for a 5k, this might be 1 mile on Tuesday, 2 miles on Thursday, 1 mile on Friday and 3 miles on Sunday.

对一个刚开始练习跑5公里的人来说，可能对应为周二1英里，周四2英里，周五1英里，周日3英里。

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And frequent business travelers will eventually be able to use a 'train mile' program across the entire network.

CNN: The high-speed rail revolution

The 220-mile train trip from New York to Boston, for instance, emits the same amount of CO2 as is stored in 2.5 cubic feet of mangrove forests.

BBC: How big is your carbon footprint?

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'