The 6 Lexington Avenue Local and <6> Pelham Bay Park Express are two rapid transit services in the A Division of the New York City Subway. Their route emblems, or "bullets", are colored forest green since they use the IRT Lexington Avenue Line in Manhattan. Local service is denoted by a (6) in a circular bullet, and express service is denoted by a <6> in a diamond-shaped bullet. On the R62A rolling stock, this is often indicated by LEDs around the service logo to indicate local or express service to riders. The LEDs illuminate in a green circle pattern for 6 local trains and in a red diamond pattern for <6> trains.
The 4 Lexington Avenue Express is a rapid transit service in the A Division of the New York City Subway. Its route emblem, or "bullet", is colored forest green since it uses the IRT Lexington Avenue Line in Manhattan.
The Dual Contracts, also known as the Dual Subway System, were contracts for the construction and/or rehabilitation and operation of rapid transit lines in the City of New York. The contracts were signed on March 19, 1913, by the Interborough Rapid Transit Company and the Brooklyn Rapid Transit Company. As part of the Dual Contracts, the IRT and BRT would build or upgrade several subway lines in New York City, then operate them for 49 years.
The Interborough Rapid Transit Company (IRT) was the private operator of New York City's original underground subway line that opened in 1904, as well as earlier elevated railways and additional rapid transit lines in New York City. The IRT was purchased by the city in June 1940, along with the younger BMT and IND systems, to form the modern New York City Subway. The former IRT lines are now the A Division or IRT Division of the Subway.
The 77th Street station is a local station on the IRT Lexington Avenue Line of the New York City Subway, located at the intersection of Lexington Avenue and 77th Street on the Upper East Side of Manhattan. It is served by the 6 train at all times, the <6> train during weekdays in the peak direction, and the 4 train during late nights.
The 96th Street station is a local station on the IRT Lexington Avenue Line of the New York City Subway. Located at the intersection of Lexington Avenue and 96th Street in the Carnegie Hill and East Harlem neighborhoods of Manhattan, it is served by the 6 train at all times, the <6> train during weekdays in the peak direction, and the 4 train during late nights.
The 103rd Street station is a local station on the IRT Lexington Avenue Line of the New York City Subway. Located at the intersection of Lexington Avenue and 103rd Street in East Harlem, it is served by the 6 train at all times, the <6> train during weekdays in the peak direction, and the 4 train during late nights.
The 110th Street station is a local station on the IRT Lexington Avenue Line of the New York City Subway. Located in East Harlem at the intersection of 110th Street and Lexington Avenue, it is served by the 6 train at all times, the <6> train during weekdays in the peak direction, and the 4 train during late nights.
The 116th Street station is a local station on the IRT Lexington Avenue Line of the New York City Subway. Located at the intersection of Lexington Avenue and 116th Street in East Harlem, it is served by the 6 train at all times, the <6> train during weekdays in the peak direction, and the 4 train during late nights.
The Times Square–42nd Street station is a major New York City Subway station complex located under Times Square, at the intersection of 42nd Street, Seventh Avenue, and Broadway, in Midtown Manhattan. The complex allows free transfers between the IRT 42nd Street Shuttle, the BMT Broadway Line, the IRT Broadway–Seventh Avenue Line and the IRT Flushing Line, as well as to the IND Eighth Avenue Line one block west at 42nd Street–Port Authority Bus Terminal. The complex is served by the 1, 2, 3, 7, N and Q trains at all times, the W train during weekdays; the R and 42nd Street Shuttle (S) trains at all times except late nights; and ⟨7⟩ trains during rush hours in the peak direction. A free passageway from the shuttle platform to the 42nd Street–Bryant Park/Fifth Avenue station, served by the 7, <7>, B, D, F, <F>, and M trains, is open during the day from 6 a.m. to 12 a.m.
The IRT Flushing Line is a rapid transit route of the New York City Subway system, named for its eastern terminal in Flushing, Queens. It is operated as part of the A Division. The Interborough Rapid Transit Company (IRT), a private operator, had constructed the section of the line from Flushing, Queens, to Times Square, Manhattan between 1915 and 1928. A western extension was opened to Hudson Yards in western Manhattan in 2015, and the line now stretches from Flushing to Chelsea, Manhattan. It carries trains of the 7 local service, as well as the express <7> during rush hours in the peak direction. It is the only currently operational IRT line to serve Queens.
The Grand Central–42nd Street station 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.
New York City Subway nomenclature is the terminology used in the New York City Subway system as derived from railroading practice, historical origins of the system, and engineering, publicity, and legal usage. Important terms include lines, or individual sections of subway, like the BMT Brighton Line; services, like the B, which is a single train route along several lines; and stations, such as Coney Island–Stillwell Avenue, which connects multiple lines and services.
The New York City Subway is a rapid transit system that serves four of the five boroughs of New York City, New York: the Bronx, Brooklyn, Manhattan, and Queens. Its operator is the New York City Transit Authority (NYCTA), which is controlled by the Metropolitan Transportation Authority (MTA) of New York. In 2016, an average of 5.66 million passengers used the system daily, making it the busiest rapid transit system in the United States and the seventh busiest in the world.
8 was a designation given to two New York City Subway services. It was first used by the Brooklyn–Manhattan Transit Corporation for its Astoria Line from 1917 to 1949. The ex-Interborough Rapid Transit Company (IRT) Third Avenue El subsequently used the designation between 1967 and 1973.
The New York City Subway's B Division consists of the lines that operate with lettered services, as well as the Franklin Avenue and Rockaway Park Shuttles. These lines and services were operated by the Brooklyn–Manhattan Transit Corporation (BMT) and city-owned Independent Subway System (IND) before the 1940 city takeover of the BMT. B Division rolling stock is wider, longer, and heavier than those of the A Division, measuring 10 or 9.75 ft by 60 or 75 ft.
(42nd Street) 
