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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.
     
  2. jcsd
  3. Jul 10, 2013 #2
    a larger wheel has a larger torque mechanical advantage to overcome resistance
     
  4. Jul 11, 2013 #3
    Thanks,

    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

    OCR

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  6. Jul 11, 2013 #5

    tiny-tim

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