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While reviewing some old photos in a book of SP steam in the 50's, they talked about Friction bearings and Roller bearings on their rolling stock. Which of the two are better? The captions under some of the photos stated that Roller bearings were better but Friction bearings were cheaper. If you keep keep them greased, shouldn't either one do the job? Could someone also explain what "wool waste" on Friction bearings is? Thanks <br /> <br />Larry
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