How do you get that? Remarkable depth of field for a long lens. And very sharp for a photo taken while running in a low-light environment.
I'm not a photo expert and you may very well be right. I'm just interested in why you think you are.
A telephoto lens does not change perspective, and the perspective is such that each succeeding car in the train appears to be about the same size. This means the train is a long way off. If it were close, each succeeding car would appear appreciably shorter than the one in front of it. Judging from the segments in the platform, the train is about 50 feet away from the victim, assuming each segment is about 20 feet. If the train is only going 30 mph it is covering 43.8 feet per second, meaning it is a little over a second away from hitting the guy. My bet is the train was traveling a lot faster than that.
Here is an article that explains how a telephoto photo can distort perception: Telephoto Perspective Compression