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In a clash of old and new industries, Wisconsin frac sand producers say their business is threatened by a handful of railroads operating under outdated regulations. Wisconsin produces about a third of the nation’s supply of sand used to extract natural gas and oil through a process known as hydraulic fracturing, or “fracking.” The dozens of mines that have sprung up across western Wisconsin in the past decade rely on four major railroads to deliver more than 30 million tons a year of their “Northern White” product to wells in far-flung places like Texas, North Dakota and Pennsylvania.
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