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Were these Victorian train lines just a load of hot air?

At any subway station, a gust of wind announces the arrival of a train long before it can be seen or heard. Like a piston, the train pushes the air in front of it – but could air be used to push the train?

Such “pneumatic railways” promised a smoother, quieter and more efficient mode of transport than electric or steam-powered trains, but the many attempts to build them in the late 1800s failed due to financial difficulties.

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