OT - Thanks for the car diagrams. Allowed this Superliner newb to realize that they had booked my family of 4 with two roomettes as requested; but one was upstairs and the other downstairs. After getting no help from Amtrak, I called Amtrak Vacations, (our booking agent), and with their wonderful customer service Brenda was able to get Amtrak to switch one of the reservations. We're all downstairs now. On other legs we are up top. Should get a good preference for one over the other. Having never rode a superliner sleeper don't have an opinion, yet.