If the size differential between me and ther other is sufficient is large enough that I can’t save lives by stepping in front of a moving train, but he could if I pushed him, I doubt I could physically push him.
Maybe if I threw a box of doughnuts on the track or something...
Obviously your moral concern for saving human life is counterintuitive to the idea of dining well as soon as possible ~ hence the box of donuts you just happened to have.
You are also OFF THE MORAL HOOK. It's up to the HUGE person next to you to leap out on to the track and grab the donuts. If he does, he stops the train and everybody but him lives, and you live on GUILT FREE. If he doesn't the train runs down the other 5 and you are out your donuts ~ which would have happened in either case.
But, again, you survive GUILT FREE.
Sociopathic personality types don't worry about GUILT. So, you're good.
It would depend on if anyone was watching...
Kidding, I can not conceive of a situation where it would it would occur to someone that you could stop a train by pushing someone on the tracks. That is such a dumb idea it would only occur to a dimocrat!