I am trying to think of a time when a train running over a fool on the track put hundreds of peoples lives in danger? If the fool was in a car/van/truck I would agree but an individual running around on the track deserves all the 200 or so tons they are going to get. All some idiot on the track causes (if killed) is inconvenience to a lot of people and a huge amount of trauma to the train driver.
When will people wake up to the fact that it is not cool, trendy or even very clever to be on a track, go and play on the M25.