The closures will be in place starting at 10:00 tonight and continuing until the system closes on Sunday. WMATA says workers will renew rail fasteners, replace insulators and remove sludge from the tunnel beneath the Potomac River.
Orange Line trains will be split into two segments. One set of trains will run between Vienna and Court House every 20 minutes, and another between Foggy Bottom and New Carrollton at normal weekend service levels.