Metrorail's Blue and Orange Lines will see track work this weekend causing delays for riders.
Trains on both lines will run every 24 minues instead of their usual 12, because of track work taking place between the Foggy Bottom and Smithsonian stations.
Metro will be replacing track circuit modules, work that was recommended by the National Transportation Safety Board to improve safety.
The delays will start Friday night at 10 p.m. and run through closing on Sunday.
Service on the Red, Yellow, and Green Lines this will run as normal.