Charlie,
Monster Mantlepieces offered the Leadville mine and powerhouse (2 separate kits). Como Roundhouse and Boilerhouse, Colorado City (Midland) Roundhouse. A Stone Locomotive shop, Durango Turntable, Como Turntable, Colorado City Turntable, and a few others. Small parts included the C-16 tender and a boiler for the Como Boilerhouse.
They were sold but I can't remember to whom. Most of the models were cast in Dental Stone, which made a nice, if fragile model. I think that Durhams Water Putty would have been a stronger media.
Rick Steele