Railway wheelset.
How can a rigid railway axle follow a curve?
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How can a rigid railway axle follow a curve?
Fit the components, then test the mechanism.
A sideways shift on tapered treads gives the outer wheel a larger rolling radius. Both wheels turn together, yet the larger radius covers the longer outer path. Real wheel and rail profiles need more detailed contact analysis.
Ideal conical treads, gentle steady no-slip curve; geometry only. No hunting, flange force or real equivalent-conicity prediction.
Match the rolling radii to the curve within 1 mm of lateral shift.
Match rolling radii to the curve.