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(The Associated Press circulated the following on September 25.)

OMAHA, Neb. — Warren Buffett’s Berkshire Hathaway Inc. bought 6,000 more shares of Burlington Northern Santa Fe Corp., the latest in a string of railroad purchases by the Omaha-based investment company.

Berkshire bought the shares of the nation’s second-largest railroad Thursday and now owns more than 52.98 million shares – or 15 percent – of the company, according to a filing late Monday with the Securities and Exchange Commission.

Berkshire reported in an SEC filing last week that it has options to buy 7.85 million shares of Burlington Northern. If the company exercises all the options, it would increase its stake in Burlington Northern to 17.2 percent.

Burlington Northern shares fell 52 cents to $80.89 Monday.

Class A shares of Berkshire Hathaway fell $200 to $116,900, while Class B shares gained $14 to $3,904.