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Mass is a cubic measurement. It does NOT scale down linearly. Thus, by cubing the HO scale ratio 35/3048 (calculated exact using 3.5mm to the foot) one gets the coefficient of scale mass to be ~1.514e-6 (.000001514). You simply multiply this by the mass you want to scale down to HO. <br /> <br />Since mass is directly proportional to weight, a loaded 75 ton freight car would weigh (75*1.514e-6) tons * 2000 lbs/ton * 16 ounces/pound = 3.63 ounces, which is completely reasonable.
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