Is it possible to run along the top of a moving train? © Getty Images

Is it possible to run along the top of a moving train?

Unless you're starring in a real-life action film, you'd have trouble keeping up with a speeding train without being swept away.

Asked by: Alan Blackwood, by email

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Anyone who’s seen a film like Butch Cassidy and the Sundance Kid, which features a character running along a train roof, will know it’s possible – as long as the train isn’t moving too fast. As speed picks up, the air blowing over the carriages becomes stronger, along with their rattle and roll, and running becomes all but impossible.


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