I used to lay on a set of railroad tracks as a train approached. I was around a curve (same spot usually) so I could not see the train although I could hear it getting closer and see the reflection of the light of the engine off a slight hill. This was at night out in the country.
I would lay humping a rail wearing a speedo pretending I was tied to the tracks and being raped as a train approached.
Obviously I always survived. The closest I ever got to actually being run over was probably 15 seconds. I always though had the train come around the curve I could just roll off the rail but now I am not so sure I would have made it. Anyway, it was great cum/fun