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The type of rail car used to transport sand depends on the quality of sand. The cars used to transport sand to a glass factory, for instance, are usually two bay covered hoppers, shorter than the three or four bay covered hoppers used to transport other commodities. This is due to sand being much heavier per volume than plastic pellets for example. Open hoppers seem to be used only when the quality of sand needed by a customer need not be as pure or protected as that of a glass factory. I hope this info helps.
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