I would imagine the Delrin wheels press onto the axle easier then the metal wheels, which would aid in keeping the axle from bending and creating wheel wobble. If there's one thing I can't stand is wobbling rolling stock and having to straighten their axles. Menards rolling stock has to be the worst I've seen. I believe all manufactures would benefit by using harder steel for axles to keep them from bending when pressing the wheels on.
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