The prototype of the car was built by Magor Car Corporation for the Southern Railway from 2-4/1965 (Series 8575-8999) and then later many of the cars got renumbered by Norfolk Southern into their 270000 series and they were classed as the HCS-23. This HO 1:87 Magor 5325 Cubic Foot Big John 4-Bay Covered Hopper STL files comes with the bodies (as built and later versions), roofwalks (as built and later versions, roofwalk support, hatch latch (print 7 of them), frame, unloading hatches RL (print 8 of them), brake wheel and coupler box covers. The only thing you need to complete this model is some 100-ton timken bearings barber S-2 trucks with on 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!!!