42nd Street Shuttle in the context of "Times Square–42nd Street station"

The Grand Central–42nd Street station (also signed as 42nd Street–Grand Central) is a major station complex of the New York City Subway. Located in Midtown Manhattan at 42nd Street between Madison and Lexington Avenues, it serves trains on the IRT Lexington Avenue Line, the IRT Flushing Line and the 42nd Street Shuttle. The complex is served by the 4, 6, and 7 trains at all times; the 5 and 42nd Street Shuttle (S) trains at all times except late nights; the <6> train during weekdays in the peak direction; and the <7> train during rush hours and early evenings in the peak direction.

The station is adjacent to Grand Central Terminal and Grand Central Madison, which serves all Metro-North Railroad lines east of the Hudson River and Long Island Rail Road lines east bound for another major hub Jamaica and several points east. There are multiple exits to Grand Central Terminal and to nearby buildings such as One Vanderbilt and the Chrysler Building. Numerous elevators make the station compliant with the Americans with Disabilities Act of 1990.

The IRT Broadway–Seventh Avenue Line (also known as the IRT Seventh Avenue Line or the IRT West Side Line) is a New York City Subway line. It is one of several lines that serves the A Division, stretching from South Ferry in Lower Manhattan north to Van Cortlandt Park–242nd Street in Riverdale, Bronx. The Brooklyn Branch, known as the Wall and William Streets Branch during construction, from the main line at Chambers Street southeast through the Clark Street Tunnel to Borough Hall in Downtown Brooklyn, is also part of the Broadway–Seventh Avenue Line. The IRT Broadway–Seventh Avenue Line is the only line to have elevated stations in Manhattan, with two short stretches of elevated track at 125th Street and between Dyckman and 225th Streets.

The line was constructed in two main portions by the Interborough Rapid Transit Company (IRT), a private operator. The first portion, north of 42nd Street, was opened between 1904 and 1908, and is part of the first subway line in the city. The line ran from City Hall, up the Lexington Avenue Line, across 42nd Street, and up Seventh Avenue and Broadway, before splitting into the Broadway Branch and the Lenox Avenue Line. The second portion of the line, that south of 42nd Street, was constructed as part of the Dual Contracts, which were signed between the IRT, the New York Municipal Railway (a subsidiary of the Brooklyn Rapid Transit Company), and the City of New York. Among the various subway lines that were to be constructed as part of the contracts, the West Side Line was to be extended south along Seventh Avenue to serve Manhattan's West Side.

The IRT Lexington Avenue Line (also known as the IRT East Side Line and the IRT Lexington–Fourth Avenue Line) is one of the lines of the A Division of the New York City Subway, stretching from Lower Manhattan north to 125th Street in East Harlem. The line is served by the 4, ​5, ​6, and <6> trains.

The line was constructed in two main portions by the Interborough Rapid Transit Company (IRT), a private operator. The first portion, from City Hall north to 42nd Street, was opened between 1904 and 1908, and is part of the first subway line in the city. The original subway turned west across 42nd Street at the Grand Central station, then went north at Broadway, serving the present-day IRT Broadway–Seventh Avenue Line. The second portion of the line, north of 42nd Street, was constructed as part of the Dual Contracts, which were signed between the IRT; the Brooklyn Rapid Transit Company, via a subsidiary; and the City of New York.