I think you guy miss the most important part of the ad. It's 423mpg per ton, not the whole train. If it was really 423mpg for the whole train, the Amtrack wouldn't need the gov. to bail out and CSX profit would be more than Exxon.
How am I being a douche while you're the one riding my ass for miss spell on a car forum? I'm only telling the truth! The OP want to "brake" into the 12's, he doesn't need 125mph to do that. 125mph trap speed is good for low 11's or even high 10's.