Making a $34 billions bet on the future of the U.S. economy, Warren Buffett's Berkshire Hathaway Inc. on Tuesday agreed to buy Burlington Northern Santa Fe Corp. "Berkshire's $34 billion investment in BNSF is a huge bet on that company, CEO Matt Rose and his team, and the railroad industry," Buffett said in a statement.

"Most important of all, however, it's an all-in wager on the economic future of the United States. I love these bets," he said.

Berkshire Hathaway already owns about 22 percent of Burlington Northern, and said it will pay $100 a share in cash and stock for the rest of the company, a 31.5 percent premium on Burlington Northern's Monday closing price. Shareholders have the option to convert their stock for a cash payment of $100 per share or receive Berkshire Class A or Class B common stock. Up to 60 percent of the deal is cash and 40 percent is in stock.

The majority of the stock in the deal will be Berkshire's "A" shares, but Berkshire's board also approved a 50-for-1 split of its Class B common stock for holders of smaller amounts of Burlington shares who opt for a share exchange rather than cash. Berkshire's Class B shares closed Monday at $3,265. With the split, each share will be worth $65.30. Burlington shares closed Monday at $76.07. Burlington shares shot up $21.56, or 28.4 percent, to $97.63 in morning trading. Shares of other major rails rose as well.

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