WMATA reports the closure is for NTSB-recommended track circuit module replacement, rail joint elimination, tie renewal and other various track improvements.
Both Blue and Yellow Line trains will operate in two segments. Blue Line trains will run between Crystal City and Largo Town Center, and between Braddock Road and Franconia-Springfield every 16 minutes from 7:00 a.m. until 9:00 p.m., and every 20 minutes from 9:00 p.m. until system closing. Yellow Line trains will run between Crystal City and Mount Vernon Square, and between Braddock Road and Huntington every 16 minutes from 7:00 a.m. until 9:00 p.m., and every 20 minutes from 9:00 p.m. until system closing.