I would think most tracks add sand after a sustained period of heavy rain. 300 to 500 tons is not that much considering the size of the main track. Spread evenly, I would think 300 tons would equate to about 1" of sand over the whole track (assuming 80' width and no chutes), if my math is remotely correct.
Obviously, I oversimplified it, I'm sure they would concentrate on the bad spots and would not be spreading it evenly throughout.
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