OAKLAND, CA - NOVEMBER 03:  A Burlington Northern Santa Fe train sits idle at the Port of Oakland November 3, 2009 in Oakland, California. Warren Buffett's Berkshire Hathaway announced today that it will purchase Burlington Northern Santa Fe railroad for $44 billion, the largest acquisition in Berkshire Hathaway's history. Getty Images logo Getty Images 3 weeks ago

OAKLAND, CA - NOVEMBER 03: A Burlington Northern Santa Fe train sits idle at the Port of Oakland November 3, 2009 in Oakland, California. Warren Buffett's Berkshire Hathaway announced today that it will purchase Burlington Northern Santa Fe railroad for $44 billion, the largest acquisition in Berkshire Hathaway's history.