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Re: Calculation

Posted by Jeff H. on Tue Jan 4 21:24:20 2005, in response to Calculation, posted by Fulton Frank on Tue Jan 4 12:02:10 2005.

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Are you factoring super-elevation in this?

The profile of the wheel is quite complicated. Take a look
at
this scale drawing

There are well-established formulae for the allowable speed given
the degree of curvature (i.e. radius) and the super-elevation.
You'll find the speeds are far less than those which would actually
cause a derailment.

The radius of curvature is generally referenced to the center line
of the track, so add or subtract half the gauge to get the radii
of the rails.

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