Update, 9:19 a.m.:
Normal service has resumed on the Red Line, Metro reports.
Update, 8:26 a.m.:
Normal service has resumed on the Green Line, but Red Line trains continue.
Trains on the Red and Green lines are experiencing delays in both directions due to signal problems this morning.
According to Metro, several outbound Red Line trains that were supposed to terminate at Silver Spring were forced to turn back one stop early, at Fort Totten, due to a switch problem between those two stations.
Green Line trains in the direction of Branch Avenue were delayed due to an earlier signal problem near the Naylor Road station. Riders can expect residual delays, Metro said.