railyard, train yard; trainsThe nation’s four major railroads are still carrying less freight than they were before the recession. But the last decade has been an exhilarating ride for them nonetheless — an era of growing profits, soaring stock prices and ambitious investments.

For Jacksonville-based CSX Corp., freight volume has dropped 7 percent since 2004. Meanwhile, its shares have climbed to $35 from less than $6, and its net income has risen 450 percent, to almost $1.9 billion in 2013, according to SEC filings.

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