"As we look out over the next several months, the political and financial challenges in the U.S. and abroad have increased economic uncertainty," Koraleski said. "In this environment, we'll continue to be agile as we were in the third quarter."

Koraleski said he expects the economy to continue to grow slowly in the last three months of 2012, but he thinks everyone is closely watching the presidential elections and what Congress does about the "fiscal cliff" of spending cuts and expiring tax cuts.

Railroad results are considered an indicator of the health of the economy. That's because the carloads of products and raw materials railroads carry can tell investors how other businesses are doing.

Union Pacific operates 32,400 miles of track in 23 states from the Midwest to the West and Gulf coasts.

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Follow Josh Funk online at www.twitter.com/funkwrite

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Online:

Union Pacific Corp.: www.up.com

Copyright 2011 Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

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