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I didn't check to see what the material was made out of, wish I had, but I wonder if perhaps the thing is to keep the soil off of the rails and from exposing the iron to any of the minerals in the soil? The soil around here that hasn't been farmed and just sitting typically is acidic with a low pH. Don't know, just searching out in right field on that one. <br /> <br />Side note on the soil here, when they built the county high school in the early '90s and sent soil samples for where they were going to put the football field to NC State University for soil analysis, they wrote back asking if this was real soil! The pH was about bottomed out on the scale and there was next to none of the macronutrients nitrogen, phosphous and potassium in the soil.
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