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The rail head needs some amount of horizontal area on top in order to just handle the vertical loading of the wheel.  So it is not just the flange side that needs to withstand the wear.  But that is an interesting question because the rail rolling manufacturing process would not fundamentally require a symmetrical rail cross section.  I would not be surprised if there are actual proposals for asymmetrical rail either already made or will be made in the future.  But I would not predict the reasons for those proposals.   In the future, it might have something to do with changing to new wheels.
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