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Very impressive, T-J, but I cannot determine if you're for or against friction.  Friction is what we need; on a smooth clean rail, a little friction is helpful - going uphill anyway, and when sand doesn't get the job done, cogs come into play. So the sand provides friction and once it's crushed to smithereens, we have to apply more and so we have more than one pipe per side delivering what's needed, clean rail or not. And it helps even if we have grasshoppers or leaves all over the railhead.  Now behind the engine, it's a different story, the less friction, the better. Opinions, though, must yield to tests, and I know I don't have the wherewith all for that. Nuff said.  Bye.
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