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- 1New York's first subway line opened in 1904●The first underground # NewYorkCity Subway line opened OTD in 1904; it was later designated as the IRT Broadway–Seventh
The first underground New York City Subway line opened on this day in 1904. It was later designated the IRT Broadway–Seventh Avenue Line and remains in service today, more than 120 years later. Transit enthusiasts and history-minded travelers are marking the anniversary and revisiting the story of the system's earliest days.