The Orange and Blue lines will again be impacted by Metro’s ongoing track work this weekend, running trains every 24 minutes.

The altered schedule will begin Friday at 10:00 p.m. and continue until midnight on Sunday. According to Metro, the delays will be in place “to allow for NTSB-recommended track circuit replacement between Foggy Bottom and Smithsonian stations.”

Trains typically run every 12 to 20 minutes on weekend. Major track work on the Metro is expected to continue well into 2017.