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I just checked my HO NMRA gauge - which is about 18 years old. It has an unlabeled cutout on one side that seems to correspond to the height of the floor of a freight car (I don't have any passenger cars to check). It measures 9/16" above the rails or 49 prototype inches (4 feet). In N scale that would be 0.306" or just under 5/16". <br /> <br />OK, just dug out the dial caliper. Actual is 0.560" or 48.77". I would say that a scale 4' would be about right for the door height platforms I used to ride from NYC to Boston on the Amtrack Turbotrain in the '70's. 19/64" should do the trick in N scale.
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