I've seen what my ammo out of my gun can do to a bowling ball. Yes, I was sorta writing in humor mode but seriously, I'm NOT kidding about the "abstract art on the ceiling" part. 125gr doing 1,600+ is no joke. Neither is the noise factor...I guarantee you, those punks won't have ever heard anything like that.
I really believe that both factors would make a 357 sixgun a better choice than a high-cap 9. That one first shot is going to go beyond merely "get their attention". It's going to horrify 'em. Not to mention make most of the rest of the train want to puke
.