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Hump yards do not work as a model. Why? Simple physics! The mass (volume) of the car decreases as the cubic root while friction is linear. In other words the volume of a car is 660,776 (87.1 x 87.1 x 87.1) times smaller than a real car but the friction is only 87.1 as much. This explains the poor rolling characteristics of models when compared to the prototype, the mass of the car to friction ratio is 7,586 times less? Not very good ratio in anybodies book. We can build accurately looking models but the physics prevents them from operating in the same way as real cars. If they, the cars would not stay put but rather roll to the low end of the layout.
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