This design is base on the prototype car of Southern #991737. The car was built by the Mount Vernon Car Manufacturing Company for the Southern Railway on 9-38 as a 50-Ton 41'6" Drop Bottom Gondola with wooden and steel sides that featured 6 drop doors fixed ends and 1825 ft3 capacity. This car was also one out of 400 cars that was rebuilt to an all steel configuration in 1967 increasing their cubic capacity to 1965 ft3 55-Tons. Then years later in the 1980s this car got put in mow service especially on continuous welded rail trains before the Norfolk and Western Railway and Southern Railway merged and creating the Norfolk Southern Corpration in 1982 and it was roaming on continuous welded rail trains when Southern Railway change their name to the Norfolk Southern Railway in 1990 and many years after that. In March 2025 Norfolk Southern donated the car to the North Carolina Transportion Museum in Spencer, NC and the car will be sitting somewhere on the property or even sometimes it will be on special freight movements when you go and visit there to this day. This HO Scale 1:87 Mt. Vernon Car Manufacturing 41'6 All Steel Modified Gondola STL files comes with the body, A and B stirrups, brake wheel and coupler box covers. Also it features allignment pin on the stirrups and and holes in the body of the car for installation. The only thing that you need to complete this model is some 70-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 for the coupler boxes.