In Dar, one morning before my train trip, I made my way to the roof of my hotel for a bird 's-eye view of the city below.

踏上这段火车之旅的前一天早晨，我登上旅馆的屋顶，想鸟瞰城市面貌，有位英国建筑工头站在那里，监督旅馆的扩建情况。

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We worked in Bushwick, Brooklyn, far from the train, in an office whose tiny reception area had a door that opened onto a poured tar roof.

我们在布鲁克林的布什威客工作，离火车很远的一间办公室，接待区很小，门开在涂满沥青的屋顶上。

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Financial markets are dancing on the roof of the train, and the vibrations could send the train tumbling.

金融市场在火车顶部起舞，舞步的震动可使火车跌无葬身之地。

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Staff spotted two broken parts near Old Street Station, east London, on 8 March after a passenger train driver reported water pouring on to the train's roof.

BBC: Construction drill came from site above rail tunnel

The Barlow train shed with its single span roof, a marvellous feat of Victorian engineering, is being restored.

BBC: St Pancras - the new link to the Channel Tunnel

If something gets in the way of the door--a person's foot or a roof panel that's hanging down--the electric motor that closes the train door has to work harder and produces more current.

FORBES: Magazine Article