Railways have benefited from such technological improvements as double-stacked rail cars and better software for managing both rolling stock and supply chains.

铁路（公司）也因技术改进而受益，例如双垛轨道车，而且有更好的软件管理全部机车和供应链。

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Stepless transmissions usebelts, chains, or rolling-contact bodies.

连续传动器使用传动带、链条或者滚动接触体。

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Buses were rolling out of depots with chains on their tires.

WSJ: Officials Urge Caution as Snow Starts Falling