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The example of the 100 ton capacity hopper is slightly miss stated, since capacity refers to the weight that the frame and trucks can carry. Thus if the car weighs 30 tons the net capacity of the car is 70 tons. Ore jennies are short with relatively small capacity volume wise, while coal hoppers are larger in length and volume because coal is much less dense than iron ore. <br />The NMRA recommended practice for car weight is based on the needed weight for the trucks to track well through turnouts, diamonds, and curves. In theory the tapper of the wheel tread should keep the wheel on the track, without flanges. This is why Proto 87 wheels have smaller flanges than RP-25 wheels,as the "87s" have a prototype tapper to the wheel tread. I have not read the proto 87 specs to see if the recommended weight of the car could be reduced with improved tracking performance of the wheels, though I doubt that the real world of occasional pushing a string of cars into a siding would result in the derailing of part of the string as the under weight cars get skewed under compression. <br />Darn Physics keeps cropping up fouling up our fun. <br />Will
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