Legendary investor Warren Buffett and his conglomerate Berkshire Hathaway Inc (NYSE:BRK)(NYSE:BRK) have made more than 50 acquisitions since 1970. A new report suggests that an acquisition in the railroad sector could be on the horizon for Buffett and Berkshire.What Happened: One of the largest acquisitions ever made by Berkshire Hathaway was the company’s acquisition of the remaining stake it did not own in BNSF Railway in 2009.Buffett began investing in BNSF in 2007 and, years later, announced plans to acquire the remaining 77.4% he didn't own for $100 per share. The deal valued BNSF at $44 billion, including $10 billion in outstanding debt.A new report from Semafor states that BNSF is collaborating with Goldman Sachs to explore another acquisition in the railroad sector.The report did not say whether it's Norfolk Southern Corp (NYSE:NSC) or CSX Corporation (NASDAQ:CSX) that Berkshire is most interested in.Semafor's report comes as The Wall Street Journal recently reported that Union Pacific Corp (NYSE:UNP) was exploring a ...Full story available on Benzinga.com