Updated post at 9:23 a.m.
A Metro spokesman said officials are inspecting the track and do not expect significant delays.
Original post at 9:12 a.m.
Metro riders in Virginia can expect delays Friday morning on the Orange and Silver lines due to single-tracking trains.
Trains are single-tracking between the East Falls Church and Ballston stations because of a track problem outside Ballston, according to Metro.
Delays are occurring in both directions.