Berkshire Hathaway announced on Monday that it is acquiring 77 percent of the country’s largest railroad, Burlington Northern Santa Fe (BNSF), for $34 billion in cash and stock. Berkshire, the holding company for the assets of Warren Buffett, the world’s second-richest man, already owns the other 23 percent.

“It’s an all-in wager on the economic future of the United States,” Mr. Buffet said in a statement announcing the acquisition. “I love these bets.”