That commercial has been out for a while here on the west coast. It's a great one! (btw, is that a C&O F unit?)
I've seen this commercial many times. In fact, I think they've stopped playing it (at least in my market). I think it's a pretty clever commercial. Surprised no one pointed out what looks like a C&O loco on the kid's layout. Left me wondering why they couldn't find an Amtrak loco...
Didn't think about it at the time but that is pretty curious too. Its O, or one of the variations of O. A quick check of Walthers has a few AMTRAK engines in O but not the other variations of it (O2, O30, ect). The list has P42 (PhIII, PhIV), F7/E8s, Horizon, AMFLEET, and Supeliner cars.