An emerging craze for riding on speeding trains has got authorities in Moscow worried. These Russian teens filmed themselves as they stowed  away on the roof of this fast inter-city train, before walking along the roof as it speeds between stations.

At one point, one of the teens produces a GPS that appears to show one of the trains he's riding on going along at 200kph (around 120mph).

A number of different trains appear in the footage, suggesting that this isn't just a one off, but a regular occurrence for the daredevil Muscovites.

Of course, it goes without saying that we in no way recommends or condones you or anybody ever knobbing about with trains in any way whatsoever.

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