WASHINGTON (AP) - Metro says customers traveling on the orange, blue and red lines should expect weekend delays because of track work, and one station will close early for a security drill.

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Metro officials say the green line's Navy Yard station will close at 10 p.m. Saturday.

In addition, Metro says buses will replace orange line trains between East Falls Church and West Falls Church. Customers using the shuttle bus service should allow about 20 minutes extra travel time.

On the blue line, trains will single track between Stadium-Armory and Addison Road, adding about 15 minutes to travel times.

On the red line, trains will single track between Judiciary Square and Rhode Island Avenue, adding 10 minutes to travel.

There is no track work scheduled this weekend on the green and yellow lines.