looks like either the train is going the other way or he is overtaking the train, either way he wouldnt be getting killed or hurt because
A. It looks like cinematic footage as there is no healthbars/ammo/etc, and being cinematic footage he could not get hurt or killed as he is the main character of the game
B. The camera is facing towards him which would be impossible to play like unless gta has replays now.
AFAIK no REAL "screenshots" have been released because people would have been sued for damages unless they are official rockstar releases. someone please correct me if i'm wrong.