From: srfurley@googlemail.com

If the video played back slower than it was recorded it would take more time
to pass the camera in playback, not less.

However, the train must still have been travelling at far more than the
permitted speed.  It would be difficult to mistake an overspeed of that
magnitude.  Would the conductor have access to an emergency brake?  If so,
then it's even more difficult to 
understand how two people could have not been aware that the train was
travelling at such an excessive speed.

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