WASHINGTON (AP) - Metro says weekend work will impact rail service on all six of its lines.

Metro says that from 7 a.m. Saturday through closing on Sunday, free shuttle buses will replace trains between Vienna and West Falls church on the Orange line.

Metro says trains will run every 20 minutes on the Silver line, which will run between Wiehle-Reston East and Ballston only.

Trains will also operate every 20 minutes on the Blue, Yellow and Green lines.

On the Red line, trains will operate every 16 minutes between Shady Grove and Glenmont.

Trains between Grosvenor and Silver Spring will run every eight to 10 minutes between 9 a.m. and 9 p.m.