Sorry! This gallery has been online for years without giving credits:

A German Co-AFOL ("CaL") once built a nice Prussian compartment car like this in 8-wide.
James Mathis invented a system to build tri-axles and this is still the best to be found:
http://www.brickshelf.com/cgi-bin/gallery.cgi?i=299431

Steven Barile has done very nice prussian cars in 6-wide style.
http://www.brickshelf.com/cgi-bin/gallery.cgi?f=30956

All three creations have heavily influenced this creation of mine!


Ben