Warren Buffett's Berkshire Hathaway (BRK.A) said on Tuesday that it is acquiring Burlington Northern Santa Fe Corp (BNI) for $44 billion. This is the biggest acquisition ever for Berkshire Hathaway. With this acquisition, Berkshire Hathaway is adding the railroad transportation business to its already diverse range of businesses including retail sales, insurance and financials, newspaper publishing, manufacturing, business services and several regional electric and gas utilities. Berkshire Hathaway, which already owns 22.0% stake in Burlington Northern, has offered $100 per share in cash and stock for the remaining portion of the holding. The transaction which is contingent on approval by two-thirds of Burlington’s outstanding shareholders is expected to close by first quarter of 2010. Burlington Northern will continue operating from its Fort Worth, TX headquarters. Berkshire Hathaway also announced that its Class B common share (BRK.B) will be split off into 50 ...