Norfolk Southern Corp's chief executive said the U.S. economy shows no signs of a double-dip recession despite slowing in the second quarter.

"We still remain convinced that the economic recovery is under way though it may proceed at a slower level than some of the first-quarter numbers" suggested, CEO Wick Moorman said at the railroad company's 2011 investor and analyst day.

The company's carload volume is up 3 percent in the second quarter through June 4, he said, in comments that were webcast.

The company said January through May volume rose 6 percent, driven by automotive, intermodal and coal sectors.

"We don't see anything that looks like a double-dip," he said. (Reuters)