I may be the only one who thinks this way, but I would prefer the use of bronze bearings in the truck side frames. The reason for my preference is that there would be no need to use wipers on the back faces of the wheels. I am pretty sure that the wipers cause more drag and noise than ball bearings would eliminate. And the reason for the use of wipers is to eliminate the incidence of electrical pitting of ball bearing side frame bearings. The use of ball bearings everywhere in the drive train from the motor and including the gearboxes I heartily applaud.
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