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Unread 19-09-2003, 11:37
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After seeing 190's CVT I was a little research on something else and found to my surprise that the coefficient of friction for iron on steel was actually fairly high. BUT the rolling resisitance is very low and the contact area is small.

Which explains why locomotive wheels are still cast iron. Actually it might have been in a railroad book that I found that little gem. Unfortunately I don't remember the reference.
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