The prototype of all 4 cars was rebuilt by Norfolk Southern from former Greenville 50' FS95 Pulpwood Cars, N&W Roanoke Shops 52 6 G-12 Coil Gondolas and SIECO 50' FS94 Pulpwood Cars in the Norfolk Southern's TieGon Conversion Program in the 1990s. This HO 1:87 Norfolk Southern Tiegon Program Gondola Pack comes with the Norfolk Southern M-271 MOW Crosstie Gondola STL files that comes with the body, A and B platforms, brake wheel and coupler box covers, the Norfolk Southern M-271 MOW Crosstie Gondola II STL files that comes with the body, brake platforms, brake wheel and coupler box covers, the Norfolk Southern M-272 MOW Crosstie Gondola STL files that comes with the body, A and B platforms, brake wheel and coupler box covers, the Norfolk Southern M-272 MOW Crosstie Gondola II STL files that comes with the body, A and B platforms, brake wheel and coupler box covers. The only thing you need to complete this model is some 100-Ton rolling bearing trucks with 33' 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.