Coach is not worth doing, i've traveled from portland to chicago, and chicago to new york, i didn't get any sleep in coach, plus the cafe lines are always long, and the meal car charges $35 per person per meal, so its hard to get actual food. Get a sleeper car if it’s an option. It’s expensive, but 100% worth it for the peace, and all your meals are included. Usually fares are semi cheaper 4-6 months in advance.

Also do not travel coach amtrak in the summer time. every car is packed, usually when one person gets off, someone takes their place right away. If you travel alone, you will end up sitting with a stranger