What is the name of the subway system serving Washington, D.C.?

What is the name of the subway system serving Washington, D.C.? It is called the Washington Metro.

The Washington Metro is the region’s rapid-transit rail system, serving Washington, D.C., and suburbs in Maryland and Virginia. It is operated by the Washington Metropolitan Area Transit Authority, usually known as WMATA. The rail service is also formally branded Metrorail, but “Washington Metro” and simply “Metro” are the standard names used in general conversation and quiz references.

The first section opened on March 27, 1976, with five stations on the Red Line in Washington, D.C. The system was planned as a regional alternative to an extensive freeway network and was designed to connect the capital’s downtown with surrounding communities. Its deep underground stations are especially recognizable for their large concrete vaults and indirect lighting.

Washington Metro is not the same as Amtrak, which is an intercity passenger railroad, or Metra, which is Chicago’s commuter-rail system. BART serves the San Francisco Bay Area. Metro’s rail network now includes six color-coded lines, with underground, elevated and surface sections spread across the metropolitan area.