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Tangerine-Jack, your points are well taken.  You mention in a prior post that the sand is pressure sprayed onto the rail.  Having watched a few, it appeared to me that the sand drops onto the rail by gravity. The effect of the sand does not appear to be long lasting as many engines had two or more sand valves on each side applying sand to more than one driver.  Some Santa Fe Mikados had two sand domes with each sand dome having two pipes on each side thereby supplying sand at 4 places on both rails. I have never checked rails after only the one driver had passed over the sand.  Looking at the rails after the entire train has passed is not a satisfactory method of checking the efficacy or the results of sanding. So I still think grit does it, not shiny clean. Art
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