Nmra Rp-11

Discussion in 'N / Z Scale Model Trains' started by nolink5750, Nov 6, 2007.

  1. nolink5750

    nolink5750 Member

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    Looking at the recommended practices from the NMRA. It says with a 17.375" radius and #6 turnouts I should be able to run Steam Locos to 24' ridged wheel-base. What exactly is "Ridged Wheel-Base"?
  2. baldwinjl

    baldwinjl Member

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    The length of a set of wheels that does not pivot with respect to each other, like a set of drivers. I would think it was measured from the center of the first to teh center of the last, but I could be wrong there.

    Jeff
  3. 60103

    60103 Pooh Bah

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    I think they actually say "rigid" wheel-base. That would be the bit over the farthest apart wheels that don't pivot. And measured to the middle of the wheel.
    On diesels, it would be one truck. On steamers, the longest set of drivers (if more than one set), excluding the front and rear trucks. Some steamers had fixed rear trucks under the firebox, so they would have to be included, but this is not often modelled.