THE rail safety regulator should “urgently intervene” in the row over guards on trains, union reps said yesterday after a passenger fell through the gap between a train and a station platform.

After getting off a late-night Southern train at East Croydon last month, a passenger walking along the platform descended onto the track.

The driver and platform dispatch staff did not see the accident, but the “on-board supervisor” — the new job title given to former guards on Southern — noticed it and took action.