Walking on the track without prior arrangement is really not acceptable. the guy should really have known better. At the very least he needs to go through his training again.

If the train was in imminent danger of hitting the trolley - and I can't see a derailament occuring in this instance especially as trains usually go pretty slow through stations - then the guy really was putting his own life at risk.

Once you allow one guy to do this then you know there'll be others and quickly lose control.

He should have phoned up and reported the trolley - with instant communications these days, and radios in trains the driver could easily have been alerted, the train diverted or stopped and the power shut off to allow for the trolley to be removed safely.