BNSF Railway Co. said Thursday it intends to buy a fleet of 5,000 strengthened tank cars to haul oil and ethanol in a move that would set a higher benchmark for safety within an industry that?s seen multiple major accidents.The voluntary step by the Texas-based subsidiary of Warren Buffett?s Berkshire Hathaway, Inc. comes as railroads in the U.S. and Canada are under intense pressure to improve safety for ...

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