csx_tunnelOscar Munoz, CSX Corp.s No. 2 executive, is leaving the Jacksonville-based railroad company to become chief executive officer of United Continental Holdings Inc. Gooden has helped lead CSX’s growth and value pricing efforts.

The move is surprising to some analysts, who are asking why would he leave CSX (NYSE: CSX), a railroad giant, when he was likely to be tapped as CEO Michael Ward’s successor.

The company noted that it delivered strong financial, service and efficiency improvements in the first six months of 2015, but expects the second half of the year to be more challenging given intensifying headwinds in its coal markets.

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