SOUTHLAKE, Texas (Bloomberg) -- The U.S. shale oil boom is putting millions of tons of sand onto North American railroads, enabling carriers to pack trains full instead of hauling just a handful of cars at a time. With help from Union Pacific Corp. and Warren Buffett’s BNSF Railway Co., the sleepy silica sand industry that once mostly supplied glassmakers now ships more than 20 million tons of the material a year. Buyers including Halliburton Co. and Schlumberger Ltd. use the sand in hydraulic fracturing at oil fields in Texas and North Dakota.
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