This download includes .STL files for all three versions of this locomotive shell as illustrated in the diagram below. You may need to slice the model in half to fit it in the build area of a smaller resin printer (Elegoo Mars, Anycubic, Photon, etc).
Also in included is a model of the chassis, which can be printed on an FDM printer and uses older Atlas/Kato drive components, namely AAR type B trucks and a 4-peg mount Kato motor. Other motors (like the HM-5) can be fitted with silicone caulk.