他家属于中产阶级，父亲在铁路上工作。

His family were middle class and his father worked on the railways.

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他在铁路上工作。

He works on the railway.

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如果在科罗拉多州的私人教练马克·卢森让他的教员适应在课堂上的音乐，那么一览表以“我一直在铁路上工作”开头。

IF Mark Roozen, a personal trainer in Colorado Springs, set his group conditioning classes to music, the playlist could start with "I've Been Working on the Railroad."

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