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Good afternoon, I noticed a few years ago that several switching yards in my area put up wind socks. There are 4 of them in a nearby yard here in Wisconsin, which is approx 1 1/2 miles in length. My best guess is that if you should have a hazardous chemical spill from a derailment, etc that you could quickly determine the direction of downwind drift of the chemical.... but that's just my guess. Any firm answers on what purpose they serve? Have you seen them elsewhere? Thx - Stack
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