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Kadee #27 have a medium length underset shank. The shank or part that comes out of the gear box attaches at the bottom of the actual coupler. Othe manufacturers will list theirs as medium underset. I don't know theother numbering systems. As for wheels, I take actual measurement for the diameter of the wheel on the tread. 28" wheels are .323 Inches in diameter in HO. 33" are.379", 36" are .413", and 38" are .437. Most modern 100 ton trucks us 36" whells
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