From WMATA:
“On Saturday, Sept. 20, and Sunday, Sept. 21, free shuttle buses will replace Red Line trains between Union Station and Rhode Island Av.
The NoMa-Gallaudet U station will be closed while crews work to replace crossties.
Service Information
Red Line:Trains will run every 8 minutes during the day and every 10 minutes after 9:30p.m. between Shady Grove and Union Station.
At Judiciary Square only, one track will be closed to customers, and trains will arrive every 16 minutes during the day and every 20 minutes after 9:30 p.m. on the track available to customers. As an alternative, customers can board at nearby Gallery Place for a shorter wait time.
Trains will run normal service frequencies between Rhode Island Av and Glenmont.
Blue Line:Normal Service
Orange Line: Trains will run every 18 minutes between Vienna and New Carrollton.
Silver Line: Trains will run every 12 minutes during the day and every 15 minutes after 9:30p.m. between Ashburn and Downtown Largo. There will be no Silver Line service to New Carrollton.
Yellow Line: Normal service
Green Line: Normal service”