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We been doing a little thinking here, dimastep!?! The subject is interesting to consider, but, likely has "little to do with the price of tea in China". I think the RP-25 standard has more to do with keeping equipment on the rails and passing through switch points, frogs and guard rails then compensating for the difference in speed between the inner and outer wheels. However, never having read RP-25 I am likely talking out the side of my neck! I know the rail head on my Atlas code 100 track is flat. So, no matter what the wheel's contour is, the wheel is riding on a pointed edge and not a rounded edge like the prototype. My un-educated, but, seemingly common sense opinion is the models would have more friction in turns then the prototype, proportionately! We're out in theory land here, which is very close to La La Land
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