As close as I can measure, the wheels on mine appear to be 1 inch diameter across the flanges at their very widest (farthest inside) and 13/16 across where they roll on the track, making them a scale 39 inches diameter. 36 inches would be 3/4 inch, so they appear to be 3 inches too large. May be they are a bit too large, but the units look fine to me as to height, but that is often something a person has to judge for themselves.
Real railroad wheels are NOT measured "across the flanges" . . .
Freight units of the earlier era, all had 40 inch diameter. Now modern, AC traction units had/have 42 inch and 45 inch diameter wheels.
Yeah, I know that, and my refernece books on UP say their E9s had 36" wheels, but I wanted to be clear about what and how I measured the wheels on mine in my post above, as I wasn't sure what Ted wanted. The rolling diameter of the wheels on mine were just a tad less than a scale 40 inches - my micrometer got 39 scale inches where the rail touches the wheel, which is how I would measure them. That's nearly 10% more than it should be but I'm okay with it as they look good.
