Metro will not conduct track work Sunday due to the dedication of the Martin Luther King Jr. Memorial and the expected crowds, but the transit authority does plan to fit in some repairs and maintenance from 10 p.m. Friday through Saturday.

The work will affect the Red, Blue, Orange and Yellow lines. Metro said customers should add about 20 minutes to their travel time.

Here’s a look at what’s ahead:

• Red Line trains will share one track between Shady Grove and Twinbrook as crews perform platform repairs.

• Orange and Blue line trains will share one track between Eastern Market and Stadium-Armory as crews conduct tunnel repairs and replace rail fasteners.

• Orange Line trains will share one track between Vienna and West Falls Church. Crews will replace cross ties and insulators on the tracks,

• Blue and Yellow line trains will single-track between National Airport and Braddock Road stations as crews perform “rail renewal work.”

The work is scheduled to conclude before the Sunday opening, which is set for 5 a.m., two hours earlier than normal, to accommodate crowds headed to the King dedication.

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