i have no idea. i would recommend that you use the electronic ticketing as opposed to a gate agent though - you just swipe your credit card and it'll pop out your ticket - the less people you have to talk to, the better - once the ticket guys on board see your ticket, they don't care about your fare, they just want to make sure you're in the right section of the train. if it processed online, i doubt they have the controls in place to stop it from working. let us know what happens...