From WMATA:
“This weekend on the Red Line, trains will single track between Dupont Circle & Van Ness stations as our team repairs concrete, water leaks, and
the safety walk, enhancing strength, stability, & durability and preventing cracks & structural issues.”
“Metrorail weekend service for Saturday, December 13 through Sunday, December 14
Trains single track between Dupont Circle and Van Ness stations. Trains run every 9 minutes between Farragut North and Glenmont and every 18 minutes between Farragut North and Shady Grove.”