At least three rail cars were damaged beyond repair in a crash that injured three workers, according to Metro.
The transit agency said a six-car subway train was returning to the West Falls Church Rail Yard when it rear-ended a parked six-car train early Sunday.
Metro said three cars are beyond repair and maintenance officials are still determining whether the remaining nine cars can be fixed. There's no total estimate of damage, but new rail cars cost about $3 million each.
Three employees were treated for minor injuries at a nearby hospital and released. No passengers were on board.
It was the latest in a series of recent accidents involving Washington's rail system. The worst was a June crash that killed eight passengers and the train operator.