Weekend work will disrupt the Red and Orange lines. (J. Scott Applewhite/Associated Press)

Metro’s plan for track work during off-peak hours on weekdays should cause no delays, the transit authority says, but the weekend work will disrupt the Red and Orange lines.

This is the last weekend of the year for major disruptions of the kind that close stations. They cease during the December holiday period.

Here’s the outlook, starting with the weekend, since that’s when the disruptions are.

Red Line: From 10 p.m. Friday through the midnight closing on Sunday, free shuttle buses will replace trains between Rhode Island Avenue and Glenmont. The Brookland, Takoma, Silver Spring, Forest Glen, Wheaton and Glenmont stations will be closed.

Fort Totten station will remain open for Green and Yellow line trains only.

The shuttle buses will stop at all stations between Glenmont and Rhode Island Avenue.

Trains will operate as usual between Rhode Island Avenue and Shady Grove. Weekend riders who might normally drive to outer stations on the eastern side of the line for a trip downtown might consider driving instead to Grosvenor, White Flint or Shady Grove on the western side.

Using the shuttles could add about a half hour to normal travel time through the work zone.

Orange Line: From 10 p.m. Friday through the midnight closing Sunday:

Free shuttle buses will replace trains between Cheverly and Deanwood. Those stations will remain open.

Trains will operate between Vienna and Deanwood on a regular weekend schedule, and between New Carrollton and Cheverly every 20 minutes. Figure on about 20 minutes of extra travel time.

Weekdays

Trains will share tracks on several lines to get around work zones during the week, but because service is less frequent anyway at those hours, Metro does not anticipate delays.

Red Line: From 10 p.m. through closing Monday through Thursday, trains will share a track between Farragut North and Judiciary Square.

Orange Line: From 10 a.m. through 2 p.m. Monday through Friday, trains will share a track between Vienna and West Falls Church.

From 10 p.m. through closing Monday through Thursday, trains will share a track between Stadium-Armory and Cheverly.

Green Line: From 10 a.m. through 2 p.m. Monday through Friday, trains will share a track between Greenbelt and College Park.

Green/Yellow lines: From 10 p.m. through closing Monday through Thursday, trains will share a track between U Street and Georgia Avenue.