We have done these 1+ day trips on Amtrak. We did a couple of blogs about our train travel, but they disappeared a while back, due to site upgrade I believe.
We have done a roomette and we have done a bedroom. Bedroom is expensive (we have an Amtrak CC and built up a ton of points) but has more room than roomette , including a separate bathroom. Couch turns down into bed, with an upper bunk that folds down.
The roomette has two seats facing one another. They fold down into the lower berth. Upper berth simply lowers down. It has a commode in the room, the cover of which serves as a step up to upper berth. Both units have a sink in them.
Meals are good, chance to meet other travelers at meals.
You will hear the train whistle blow long - long - short- long every time it approaches a grade crossing. You'll get used to it.
The swaying of the train i found relaxing, just be careful walking on the train while it is moving. Wear shoes while walking outside your room.
By all means bring your own liquor. If you use a mix (i.e.,rum and coke) may want to pack some cans too. Enjoy the travel, and remember, 3+ days in a roomette, a can of air freshener can be well appreciated, by you, and others on the train
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Have a great trip. Take pictures.
Dave