FORT WORTH, TEXAS - NOVEMBER 3:   A Burlington Northern Santa Fe Railroad locomotive sits on the tracks November 3, 2009 in Fort Worth, Texas. Billionaire investor Warren Buffett announced Tuesday his Berkshire Hathaway company plans to purchase 77.4% of Burlington Northern Santa Fe Corp. Getty Images logo Getty Images 27 months ago

FORT WORTH, TEXAS - NOVEMBER 3: A Burlington Northern Santa Fe Railroad locomotive sits on the tracks November 3, 2009 in Fort Worth, Texas. Billionaire investor Warren Buffett announced Tuesday his Berkshire Hathaway company plans to purchase 77.4% of Burlington Northern Santa Fe Corp.