In my younger days, I worked in a leaf spring shop and used to make leaf springs for tri-axle dump trucks and just about anything that had leaf springs. We were one of 2 shops located in Connecticut. I was on the west end of the state so it would make anyone interested easy to find. It took a 50 lb. hammer and a twin forked anvil, lots of heat and you wore asbestos gloves. As I progressed, I ended up in the aerospace industry working on the Hubble Telescope and eventually, at Sikorsky Aircraft. I offer this up only to tell you with some certainty, you model looks like the real thing. Not close, but exactly like it. The metallic wheels are familiar as I lived 10 feet from a train station, Branchville , Connecticut, and saw trains every day. The way the shiny part connects with the black part of the wheels is exactly right. It is actually amazing. The whole model is, so far, and I have been following it since you started, amazing!