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How does rolling resistance of rail wheel depend on diameter?

  1. Jul 10, 2013 #1
    Freight train is more efficient than truck due to lower rolling resistance. And I wonder which one has lower rolling resistance, small diameter or larger one or it doesn't not depend on diameter at all? Both are steel wheel on steel rail.
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  3. Jul 10, 2013 #2
    a larger wheel has a larger torque mechanical advantage to overcome resistance
  4. Jul 11, 2013 #3

    From some source, it seems larger wheel has lower rolling resistance, but explained by larger torque seems to be not really true because torque can be change by gear ratio. I think larger wheel will spread it pressure better and so deform ground less and so on, less rolling resistance.
  5. Jul 11, 2013 #4


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  6. Jul 11, 2013 #5


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  7. Jul 11, 2013 #6
    lol good eye, I would have missed that notation,
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