For 45 square feet, the Amtrak bedroom felt spacious. My Amtrak bedroom had a sofa that folded out into a bed, a bunk that pulled down from the ceiling, and a chair that folded up out of the way.

(As interior designer Keita Turner put it, “The sign of a quality sleeper is that you walk into the room ... beds and full-sized sofas that contain queen- or king-sized mattresses. Like buying a ...