steam loco question

nw-mailing-list at nw-mailing-list at
Mon Jun 26 14:13:20 EDT 2006

In a nutshell, the tyres on the wheels are slightly coned - increasing in
size towards the flange. Thus, as the loco moves to the outside of a curve
the outside wheel is riding on a slightly larger diameter part of its tyre -
and the inside one is on the smaller diameter on the outside of its tyre.

I'm sure that there's a more technical explanation than that, but that's it

Very best wishes,
Peter Prydderch Stockport UK

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