SAN FRANCISCO — Despite this week’s downgrade of the rail corridor that connects them to the nation, the ports of Long Beach and Los Angeles are beginning to show signs of growth again, adding to evidence that the Great Recession is easing, analysts, economist and port officials say.

In December, traffic rose at both the Los Angeles Harbor Department and the Port of Long Beach, the two busiest U.S. container ports, the first time both posted positive numbers in the same month since early 2007.

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