Like James said, time of year and direction you are going determine the cost! Family room is a 6'6" long set of bunk beds, and a 5' long set! You can also skip a room and stay in a coach seat for much less!
Depends on the room and the day. There are roomettes up to family bedrooms. Northbound is more expensive in the Spring, southbound in fall due to demand. You should plan on about $1 to 2K each way as a ball park, but may find it substantially different.
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