The loco is also built to accommodate a sound decoder, which means much
less weight in the boiler. That reduces tractive effort.
0-6-0s couldn't actually haul much more than half a dozen to a dozen or
so loaded cars. But buyers want locos that can haul that many and more
up an 18" radius 3% grade, so traction tires are necessary. So long as
the tires aren't lumpy and bumpy, I'm not really put out about it.
Goodoh! The old perennial, traction tyres, yes or no has re-appeared.
Wolf is quite correct in his comments. Hauling power, model or full size,
depends basically on two things, axle load and co-efficient of friction
between wheel tyre and rail head. As Wolf said, with a de-coder in the
small boiler of an 0-6-0, the axle load goes down, so the only way that one
can get the loco out of the 'skin off a rice pudding' class is to increase
its co-efficent of friction, and that is done by the fitting of traction
tyres. If these are properly fitted, as on most European models there are no
problems with running.
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