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.
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