One of my scariest ever experiences in the police was answering a report of kids playing on the tracks.
We had a butcher's and found three 5-6 year olds on the line. We went down to get them and realised that a train was coming. We pushed them down a and practically lay on top of them. a train passed at (it felt like) 60m/h and within a meter of us. I could feel myself being lifted up by the slipstream. The kids on their own would have been toast. For the length of time it took for the train to pass (no more than about 15 seconds) I honestly thought I was going to die!