I'm not sure the "pushed gently" is an accurate description of going from zero to the locomotive's velocity in 0.1 seconds, especially if the train is traveling at, say, 60mph. With the mass of the locomotive, compared to that of the car, it is the equivalent of the car being dropped on it's side from high enough to hit steel-reinforced concrete at 60mph. Or of a fly-swatter hitting a fly on the wall. The trains in the video were traveling pretty slowly. If you have seen the aftermath of train-vs-road vehicles at a train speed of 60 or so, with various-sized chunks of, say, a large semi-tractor and trailer littered over a four or five acre area, to the point that identification of what sort of vehicle it used to be is rather difficult, "pushed gently" is a phrase that does NOT come to mind.