HI, I know MTH made some Superliner RTR sets with Bi-level passenger cars.
I've also been inside a CNW bi-level (superliner? or is that term copyrighted by Amtrak?) passenger car at the IRM. (Maybe one of these: http://test.irm.org/railwire/rw179-03a.jpg ?)
Did anyone make a RTR set with these bi-level (/hi-level/gallery) passenger cars -- in O-31 -- other than MTH's Amtrak set from 2002?
The only MTH CNW bi-level car I could find (20-6658) is O-42, which is too big. I seem to recall than K-Line made some CNW bi-level cars, but they were not in a RTR set.