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John, I agree with all you said, but you are only going back to the point where the railroad was invented with the purpose of self-guidance and low friction.  My point is that long before that, the railroad principle was invented with the ruts worn in the roads totally by accident, with no intended purpose.  No purpose was even recognized for the railroads accidentally created by the ruts.  The idea for the purpose came later, starting at the beginning of your explanation.     So not only does the gage go back to the ruts, but the railroad concept originated there as well, although with no recognized purpose.   It originated with flanged rails and plain wheels but I would say that still qualifies as the railroad principle.
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