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The United States is home to some of the world's oldest and most extensive metro systems, with the New York City Subway being the largest by number of stations. American metro systems have played a crucial role in shaping urban development and continue to serve as vital transportation arteries in major metropolitan areas.

From the 24/7 operations of the New York Subway to the modern systems in cities like Washington D.C., Chicago, and San Francisco, U.S. metros showcase diverse approaches to rapid transit. These systems connect city centers with suburbs, airports, and business districts, supporting the mobility needs of millions of Americans daily.