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Tim O'Connor wrote: "At a train club I belonged to, MANY cars with
Kadee wheels (mostly in non-Kadee sideframes) wore down the ends of the
axles to a round nub! In a high-use context, metal axles last longer...
But yeah, on a private low-mileage layout, it's probably not an issue."
Were non-Kadee truck frames metal or plastic? Some of the problem of
wear may relate to what JP Barger noted in his presentations on truck
frames and wheel-sets that one wants metal axles in plastic truck frames
or the opposite. Kadee's older trucks always had plastic axles in metal
truck frames. It will be interesting to see how the new
plastic-on-plastic combination will perform long-term.