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The Washington Metro, the second-busiest rapid transit system in the U.S., opened to commuters.
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Washington Metro
Rapid transit system serving the Washington metropolitan area
The Washington Metro, often abbreviated as the Metro and formally the Metrorail, is a rapid transit system serving the Washington metropolitan area of the United States. It is administered by the Washington Metropolitan Area Transit Authority (WMATA), which also operates the…Source: Wikipedia (CC BY-SA)
Rapid transit
High-capacity public transport
Rapid transit or mass rapid transit (MRT) or heavy rail, commonly referred to as metro, is a type of high-capacity public transport that is generally built in urban areas. A grade separated rapid transit line below ground surface through a tunnel can be regionally called a…Source: Wikipedia (CC BY-SA)