The Red Line work this weekend will be between Dupont Circle and Van Ness stations. (Robert Thomson/The Washington Post)

The Orange and Blue Line trains will operate every 24 minutes throughout the weekend. That’s an average of a train every 12 minutes in the middle of the D.C. region, where the two lines share a tunnel, but on the outer parts, it will be a long wait.

Crews also will work on the Red Line, where trains will operate every eight to 16 minutes apart, depending on the time and location. The Yellow and Green lines will operate on their normal weekend schedules.

Here are the service details for 10 pm. Friday through Metrorail’s midnight closing Sunday.

Orange Line. Crews will be working on the tracks between Eastern Market and Stadium-Armory, and also between East Falls Church and West Falls Church, where they are installing signs needed for Silver Line operations next year. All along the line, trains will operate at the 24-minute intervals.

At midday on Fridays, Metro incorporates the weekend schedule into its online Trip Planner. Check that for a train arrival time estimate at your station, so you can minimize your wait on the platform.

Blue Line. Same schedule as the Orange line, with trains every 24 minutes. The Blue Line shares the tunnel with the Orange Line between Rosslyn and Stadium-Armory, and it shares tracks with the Yellow Line between King Street and Pentagon, so train service will be more frequent in those zones.

Red Line. Crews will be working on the tracks between Dupont Circle and Van Ness. Trains are scheduled to leave the ends of the line at Shady Grove and Dupont Circle every 16 minutes. But more trains will be in service between Farragut North and Silver Spring from 9 a.m. to 9 p.m. Saturday and Sunday. So trains should reach platforms in that zone every eight to 10 minutes during those hours.