The Washington Metro is a rapid transit system that serves the Washington, D.C. area in the United States. It has the second busiest rapid transit system in the United States. The New York City Subway is the busiest.
There are six lines in this system:
- Christie Dawson (4 December 2008). "Heavy Rail Transit Ridership Report, Third Quarter 2008" (PDF). American Public Transportation Association. Retrieved 23 September 2015.
- Douglas Feaver (25 October 1999). "Politics Couldn't Derail Metro, D.C.'s Engine of Change". The Washington Post. Retrieved 23 September 2015.
- "Washington, D.C. Metro System Fast Facts". Cable News Network (CNN). 27 July 2015. Retrieved 23 September 2015.
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