The prototype of the car was built by the Greenville Steel Car Company for the Southern Railway and it had 4 different railroad classes like the HS-47 (Built 7-9/1972 Series 133450-113547), the HS-48 (Built 10-12/1973 Series 133575-133724), the HS-49 (Built 1-5/1975 Series 133725-134224) and the HS-50 (Built 2-4/1977 Series 134225-134499) This HO Scale 1:87 Greenville 100-Ton 7526 Cubic Foot Woodchip Hopper STL files comes with the body, A and B platforms, brake wheel and coupler box covers. The only thing that you need to complete this model is some 100-ton rolling bearing trucks with 36' metal wheels and metal couplers of your choice. Also you need 2-56 x 1/4 phillips pan head screws for the trucks and 2-56 x 1/8 phillips pan head screws coupler boxes.