steam loco question

nw-mailing-list at nw-mailing-list at
Mon Jun 26 14:35:53 EDT 2006

Actually the inside and outside drivers travel a
different length of rail per revolution. The driver
tires are tapered slightly. With the flange against
the outside rail on a curve, the largest diameter
portion of the wheel contacts the rail. On the inside
rail, a smaller diameter contacts the rail. There is
a difference in the circumference. The outside wheel
travels slightly further per revolution than the
inside. This differential effect helps ease the
potential problem you stated.

Not a terrific explanation but hope it helped.

Dave Stephenson

> A steam locomotive enters a curve with drivers on

> both sides eating up the same amount of rail,--why

> does the drivers on the shorter rail not climb out

> ??


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