steam loco question

[nw-mailing-list at nwhs.org]

  ...meaning of course that as the loco enters the curve, that the inside wheel lowers itself 1/8" on its flange, and the outside wheel climbs on its flange 1/8", you've gained that needed 1/4" in diameter on the outside drive wheel!  

  Not to be a nit picker, but the wheels do not climb on the flange.  The shape of the flange has been research in depth and is carefully designed so that the flange does not climb the railhead.  BTW, there is also a carefully designed fillet between the wheel tread and the flange itself.  

  Michael Ross
  Ft Worth, TX
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