The 191st Street station is a station on the IRT Broadway–Seventh Avenue Line of the New York City Subway. Located at the intersection of St. Nicholas Avenue and 191st Street in the Washington Heights neighborhood of Manhattan, it is served by the 1 train at all times. It is the deepest station in the New York City Subway system at about 173 feet (53 m) below street level. Access to the station's main entrance is only provided by four elevators from the mezzanine situated above the platforms. A 1,000-foot-long (300 m) pedestrian tunnel also extends west from the station to Broadway, connecting it with the Fort George neighborhood.

The first regularly operated line of the New York City Subway was opened on October 27, 1904, and was operated by the Interborough Rapid Transit Company (IRT). The early IRT system consisted of a single trunk line running south from 96th Street in Manhattan, with a southern branch to Brooklyn. North of 96th Street, the line had three northern branches in Upper Manhattan and the Bronx. The system had four tracks between Brooklyn Bridge–City Hall and 96th Street, allowing for local and express service. The original line and early extensions consisted of:The IRT Eastern Parkway Line from Atlantic Avenue–Barclays Center to Borough Hall The IRT Lexington Avenue Line from Borough Hall to Grand Central–42nd Street The IRT 42nd Street Shuttle from Grand Central–42nd Street to Times Square The IRT Broadway–Seventh Avenue Line from Times Square to Van Cortlandt Park–242nd Street The IRT Lenox Avenue Line from 96th Street to 145th Street The IRT White Plains Road Line from 142nd Street Junction to 180th Street–Bronx Park