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The minimum height from the top of the rails is 22 feet on the prototype. The NMRA standard is 3 inches, about .030 in. shorter than 22 scale feet in HO. What you have to watch out for is equipment tha is out of scale. Most of the time thebody of thecar will be scaled right, but it will be riding to high on the trucks. Over height equipment is a problem with the real railroads now a days. The best bet is to test taller equipment at all low clearance locations.
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