The C&O had a pioneering set of 1000 3-bay offset side hoppers delivered in 1949 with Timken roller bearings; 79000 series. Bob Chapman had an article on modeling one in the April 1994 Mainline Modeler, plus Al Kresse's article in a 2008 issue of the C&O HS magazine and his book on C&O hoppers. I had to create my version of the truck by modifying a Kadee truck with Custom Finishing Timken caps. Crude but it gets the point across.
