It was about 1.15am when the SNCF maintenance workers, carrying out repairs by moonlight, spotted the group of people a little further down the railway line near a signal box outside the sleepy village of Vergigny, in the northern French department of Yonne.
They were concerned enough by the unlikely sight at such an hour to approach the intruders, and then to make a call to the local police as those they had interrupted ran off into the dark.
