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If you aren't paying attention it's not noticeable. However in doing some homework...the EM-1 according to Wikipedia should have a 64" driver (.40 inches). I mic'd the driver at .365" which translates to a 58.5" driver. The drivers should be slightly smaller than the Athearn Big Boy drivers (68"/.43").The S.
Measure them at the flange. I bet they are close to 64 at the flange. The over all wheel base is what they were shooting for. If you use scale wheels with N scale flanges, the wheelbase would be a foot or two longer than the real loco when you make room for flange clearance. When we look at a loco, the flange adds weight to the wheel diameter, most steam locos are undersized at the tread.There is a report on another forum of an EM-1 pulling 25 cars (all the owner had) up a 3% curving grade with out a struggle.
The OD of the flange. In a full size loco, the flanges are just an inch or so apart (between drivers) and the flange is less than an inch anyhow. We are talking a few thousandths in N scale terms. Our trains would never stay on the rails with scale wheel diameter and flange depth.