WASHINGTON (AP) — Metro says two of its rail system’s six lines will be affected by weekend work.

Metro says that on the Orange Line, free shuttle buses will replace trains between Vienna and East Falls Church on Saturday and Sunday. Metro says Orange Line trains will operate every 20 minutes between Wiehle-Reston East and New Carrollton.

Metro says that on the Red Line, work will be going on between Rhode Island Avenue and Takoma. Metro says that on Saturday and Sunday from 9 a.m. to 9 p.m., trains will run every 12 to 14 minutes between Shady Grove and NoMa-Gallaudet. Passengers not traveling on that section will wait longer for trains.

Metro says trains on the Silver, Blue, Yellow and Green lines will operate at weekend intervals.