Updated at 6:22 p.m.:

Metro now reports that the Red Line is no longer single-tracking between Dupont Circle and Van Ness. But expect the delays and crowding that have plagued riders since the Red Line headaches started earlier to linger.

— Mark Berman

Updated at 6:15 p.m.:

Red Line trains are now single-tracking between Dupont Circle and Van Ness due to a disabled train outside Dupont Circle. This will lead to additional Red Line delays, creating additional problems for riders still encountering the issues from the single-tracking earlier in the evening.

— Mark Berman

Updated at 5:29 p.m.:

Red Line trains stopped single-tracking shortly before 5:30 p.m., according to Metro. However, there are still delays in both directions due to the earlier single-tracking. In addition, expect to encounter major crowding on Red Line stations as you head out this afternoon.

— Mark Berman

Earlier:

Red Lines trains are facing delays in both directions Tuesday afternoon because of a third rail power problem between Fort Totten and Takoma, Metro said.

Metro suggests riders use the Green Line as an alternate.

The alerts from Metro first went out around 4:43 p.m. and were reported as a track problem. Metro later put out two alerts saying it was related to power problems.

A Metro spokesman said in an e-mail “We have experienced a loss of 3rd rail power in the area of Fort Totten.” He said the power loss is on the inbound track and that “no trains are without power.”

Trains are sharing a track around the troubled area.