The track lift selects steel wheel whose life is as long as the whole machinery, while the tyres need replacement if necessary.

轨迹吊选用钢制车轮，寿命基本上能够确保和整机一样，而轮胎吊的轮胎需定时替换。

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The large track maintenance machines were used in the railway engineering construction of replacement for ballast on the Guangzhou-Maoming railway line.

文章介绍了有关在广州-茂名铁路运用大型养路机械进行更换石碴施工的技术和经验。

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Mr Ambler added his firm was investigating a "fast-track replacement" for Normandie 1 along its current route.

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Track replacement and signal modernization would be accelerated.

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But the connection from Hoboken down to the World Trade Center tunnels is still severed, as the railroad awaits delivery of a replacement track switch.

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