Washington, DC Metro System Fast Facts | CNN
Hats Off to Baltimore's Doomed Subway! - Bloomberg
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List of metro systems - Wikipedia
Home | MTA
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Los Angeles Metro: The Red Line Subway - YouTube
Subway | History, Transportation, Cities, & Facts | Britannica
Beijing Metro System | Beijing Visitor - China Travel Guide
Washington Faces Breakdowns and Paralysis, and That's Just the Metro - The New York Times
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World's oldest metro systems - Railway Technology
Los Angeles Subway: What It's Like to Ride
Tokyo Metro
Los Angeles Metro Guide When You Want to Explore LA Without a Car
10 fun facts about subway systems of the world - Kiwi.com | Stories
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Getting Around New York City: Guide to Public Transportation
List of metro systems - Wikipedia
What is the Difference Between a Metro, a Subway, and an Underground? - WorldAtlas
Which cities in the world have a metro or subway? | Spotted by Locals blog
Lessons from Washington Metro, America's Last Great Subway System
List of metro systems - Wikipedia
