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Berkshire Hathaway's Best Business?

The S&P 500 slipped slightly lower as investors dumped some holdings to make way for Berkshire Hathaway, which will join the index after Friday’s closing bell. Cramer recommended that people give the stock a serious look when the market reopens after the President’s Day holiday.

“I’m a buyer of the guy’s company,” Cramer said, referring to Berkshire chief Warren Buffett.

Cramer said that he has been bullish on the rails since Mad Money first launched in 2005, and Berkshire’s exposure to the industry was one reason he likes the stock so much.

“Now that he’s clearly overweighted in rails,” Cramer said, again mentioning Buffet, “I want to buy them even more.”

The Mad Money host called the rails “a great oligopoly,” saying they can raise prices virtually without impunity. But the service is “such an efficient way to be able to ship goods that they can take the rates up.” Congress might try to pass legislation to keep this practice is check, Cramer said, but he doubted it would work.

The Mad Money host praised Norfolk Southern and said he also counted Union Pacific among his favorites.

“I like every single one of the rails,” Cramer said, adding, “Union Pacific’s got a lot of upside from here.”

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