I love my 15" K-Line Hiawatha cars. Needed to do some work on them when I got them, but thanks to Brasseur Parts, they now look beautiful with full interiors to which I added even MORE passengers. I always wanted a Skytop Lounge Observation Car, and now I have one. The 21" cars would be too long, even for 72" curves. I wouldn't mind a set of 18" cars, though.
John