Thanks so much for the responses!! I didn't realize there was an entire thread on this already...guess my Search function wasn't working right.

Anyways...thanx again for the responses. We were just thinking it would be a good alternative to driving if we can't find really low flight tickets. We were going to just drive but I had a serious injury recently and won't be able to help my hubby with the driving...(& we want to drive straight thru from PA)...so we thought auto train would be a good alternative. It would only cost us $579 (coach--round trip including the charge for our car) and I don't think that's too bad...considering right now the airplane tix would be aprox $600 + we'd have to rent a car for 2 weeks which is almost another $400. I don't know....I think it sounds like a fun experience and it will take us 15 hours regardless if we drive or take the train so that is not much of an issue.
My only worry is are their many delays? I hear something about having to pull over to let other trains go thru (or something like that) and that this could majorly delay the trip? Any truth to that?