New York City Subway System Begins Operations
By the early 20th century, New York City's rapid population growth strained existing elevated railways and streetcars. Planners developed an underground rapid transit system to alleviate congestion and connect Manhattan neighborhoods efficiently. On October 27, 1904, Mayor George B. McClellan operated the inaugural train on the Interborough Rapid Transit (IRT) line, which ran 9.1 miles from City Hall to 145th Street with 28 stations. Over 100,000 passengers rode on the first day after public opening at 7 p.m. The system quickly expanded, becoming a model for urban mass transit worldwide.
Why it matters: The subway transformed New York into a modern metropolis by enabling suburban-style growth within the city and supporting its emergence as a global economic powerhouse. It influenced transportation infrastructure in cities across the United States and beyond. Today, the MTA system remains one of the largest and busiest rapid transit networks, underscoring the lasting legacy of early 20th-century urban planning.