Montana Rail Link reported on Monday that one of their coal trains derailed late Sunday night in northwest Montana.

MRL spokesman Jim Lewis said the derailment occurred at about 11:00 p.m.

"At approximately 11:00 p.m. on Sunday, August 13th, a trail carrying coal derailed near Noxon, Montana on Montana Rail Link's main line," Lewis said. "Noxon is located approximately 50 miles west of Thompson Falls. No injuries occurred and the train was not hauling any hazardous materials."

Lewis said approximately 30 cars left the tracks and overturned.

"The estimated time for rail traffic to resume has not yet been determined at this time," he said. "The cause of the incident is under investigation."