Originally Posted by
lo2e
This part of your plan scares me - wouldn't you basically be a stowaway if you're on a train you don't have (and can't get) a ticket for?
Edit to add: Plus, I'm not even sure your RTE-NYP instead of BBY-NYP argument holds water. A conductor might not know that the two are the same price, and since you got on at BBY, you technically do not have a valid ticket until the train reaches RTE. So I think that would also qualify you as a stowaway. YMMV though.
That aspect doesn't really concern me.
1. Even if it's sold out, it won't be sold out out of BBY; there certainly will be passengers boarding in RTE and PVD, so seats will be available.
2. On several occasions I've seen passengers board Acela trains with a ticket for a different train, either a Regional or an MBTA train. In each case, the only repercussion for the passenger was getting kicked off at the next stop.