Montana Rail Link officials say about 40 cars of a coal train derailed in south-central Montana, closing the main rail line.

The derailment happened at about 11:30 p.m. Tuesday at Columbus.

Montana Rail Link spokesman Jim Lewis says the cars that derailed were carrying a total of 4,720 tons (4,282 metric tons) of coal. The train was traveling just under 40 mph (64 kilometers per hour) when it went off the tracks.

Officials say no one was injured and there is no health risk. The cause of the derailment is under investigation.

Heavy equipment was brought in to right the cars and remove debris.

My wife had a business trip yesterday and drove through Columbus.  She said it was all cleaned up.  That's pretty impressive.