M.P.
Are you kidding me people!!!??! Amtrak is soooo much fun! Last time I was on it, I was 9 so I probably had a different experience than my parents. I do remember having to buy a blanket though. But it's been around my house since then! It's a great reminder of memories.
Take snacks. I remember I was very snack-y. Even when we were up at 2 am to get to the station (that is the only time it rolls though here in UT)
Take tons of pictures. My parents didn't, and I wish they had. It was such a fun vacation.
Hope you have fun!!