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Friction Bearings are too hot to bother with these days.You have to physically check every axle on both sides, open the small door check the packing, grease and make sure that it isnt snagged, too hot or out of oil.If you dont catch it and the train leaves, it will get hotter and cause a fire or HOTBOX and if not detected in time, break the truck; spin the axle out and wreck the whole thing.Roller Bearings are superior in today's service.I suppose not too long in the future will see magnetic bearings where very powerful short range magnets possibly driven by cyro cooling or other source will suspend the axle in space with nothing physcially touching it.Some older railroads run on friction bearings and I find myself eyeballing the things when boarding to enjoy a ride. Then again write me off as a nut and I dont need a wheel problem lol.
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