The prototype of the car was built by the Greenville Steel Car Company for the Norfolk and Werstern Railway from 6-7/1984 (Series 544100-544225 and then NS Series 994600-994725) This HO 1:87 Greenville H-46 MOW Ballast Hopper STL files comes with the A and B bodies, brake wheel and coupler box covers. The only thing 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 for the coupler boxes. Note these STL files is for personal use only and not to be commercially reproduced!!!