According to Environment America, high-speed rail USES a third less energy per mile than auto or air travel, and a nationwide system could reduce oil use by 125 million bbl. a year.

根据美国环境署资料，高铁和汽车或者飞机相比每公里使用能源最少，而一个全国范围的系统将能每年减少使用1.25亿桶的石油。

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Many branch lines use diesel engines and the Harlem-Hudson line uses a third rail system to draw power.

WSJ: Commuters warned: Summer heat may slow Metro-North

Trains between London and the South East of England were particularly affected with the third rail system being iced over.

BBC: Transport Committee

Mr Hammond told MPs that there was a possibility of a roll-out of a heated third rail system, describing it as "particularly vulnerable".

BBC: Transport Committee