Metro trains are running again between the Fort Totten and NoMa-Gallaudet stations after an overnight train derailment closed a portion of the Red Line.
No one was on board the six-car train when it derailed between the Rhode Island Avenue and Brookland stations while being moved to a rail yard for maintenance.
No one was injured but the derailment severely disrupted Metro service Friday until about 1:30 p.m.
It is not yet known what caused two sets of wheels on the train to derail, a spokeswoman said.
Metro said the derailment did cause damage to track equipment - including the third rail, signal cables and track components - near the Rhode Island Station.
Service was back to normal Friday afternoon but previously scheduled track work along the Red Line was expected to close some of the same affected stations for the Labor Day weekend starting Friday at 10 p.m.
Buses will replace Red Line service at the Silver Spring, Takoma, Fort Totten and Brookland stations over the weekend.