Efforts are underway to return 14 Pan Am Railways freight cars to the tracks, after they derailed in Westford this morning, according to company officials.

At about 7 a.m. the cars went off the tracks on Bridge Street at North Main Street, said Cynthia Scarano, executive vice president of Pan Am Railways Inc.

“We were pretty lucky,” she said. “They all landed upright. No merchandise spilled.”

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The cars were part of a 63-car long freight train carrying various supplies, including lumber and paper. Six of the derailed cars were loaded, while eight were empty, said Scarano.

Police and Pan Am employees have been on the scene all morning, said Westford Police Sergeant Marc Proia. No injuries were reported.

Bridge Street will remain closed at North Main Street and Pine Ridge Road until the cars are cleaned up, he said.

As of 11 a.m., six of the approximately 65-foot-long cars were back on the rails, said Scarano.

Scarano said the company would investigate the cause of the derailment, which could take a few days. She said she was not sure if it was weather-related.

The derailment came a day after four train cars carrying automobiles derailed in Gardner.