I rode amtrak from portland oregon to winona minnesota last may.
bring along warm clothing just in case it's cold in the train.
the seats are comfortable.
THey have a dome car when you can go and chat with other passengers, believe it or not, many normal people ride amtrak, unlike greyhound or the city bus.
It takes a long time to get anywhere, like it took me 41 hours to get from oregon to minnesota wisconsin border.
Bring lots of food with you, like i brought a full duffel bag of food, cause if you buy food on the train it's quite expensive.
sometimes it can be quite reasonable priced, however currently i don't think that is the case.
i noticed somebody suggested getting a sleeper car, NO. do not do that, it's like 300 dollars more round trip. waste of money, just get the coach seats,