Metro says a train has derailed in northern Virginia injuring one of about 75 passengers on board.
Media outlets report Metro General Manager Paul Wiedefeld said the derailment Friday morning caused significant damage to the tracks, switch mechanism and two rail cars. Service is suspended through the area on the orange and silver lines into the evening.
Metro spokesman Dan Stessel says a man who said he was sleeping when the train derailed was taken to a hospital with a head injury.
Metro officials say the derailment happened by a switch where trains begin using one track in an area where Metro's performing work as part of a major maintenance effort.
The cause is under investigation and the National Transportation Safety Board and the Federal Transit Administration have been notified.