Interborough Rapid Transit Company in the context of "Times Square–42nd Street station"

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, which is itself controlled by the Metropolitan Transportation Authority of New York. In 2015, an average of 5.65 million passengers used the system daily, making it the busiest rapid transit system in the United States and the 11th busiest in the world.

The present New York City Subway system is composed of three formerly separate systems that merged in 1940: the Interborough Rapid Transit Company (IRT), the Brooklyn–Manhattan Transit Corporation (BMT), and the Independent Subway System (IND). The privately held IRT, founded in 1902, constructed and operated the first underground railway line in New York City. The opening of the first line on October 27, 1904, is commonly cited as the opening of the modern New York City Subway, although some elevated lines of the IRT and BMT that were initially incorporated into the New York City Subway system but then demolished predate this. The oldest sections of elevated lines still in operation were built in 1885. The BMT, founded in 1923 and also privately held, was formed from the bankruptcy of the Brooklyn Rapid Transit Company. The IND was created by the City of New York in 1921 to be a municipally owned competitor of the two private companies. Unification in June 1940 by the New York City Board of Transportation brought the three systems under one operator. The New York City Transit Authority, created in 1953 to be a public benefit corporation that acquired the rapid transit and surface line (buses and streetcars) infrastructure of the Board of Transportation, remains the operator of the New York City Subway today.

The Jackson Heights–Roosevelt Avenue/74th Street station is a New York City Subway station complex served by the IRT Flushing Line and the IND Queens Boulevard Line. Located at the triangle of 74th Street, Broadway, and Roosevelt Avenue in Jackson Heights, Queens, it is served by the 7, E, and F trains at all times; the R train at all times except late nights; the M train on weekdays during the day; and the <F> train during rush hours in the reverse peak direction.

The complex consists of two stations: the elevated station at Broadway–74th Street, built for the Interborough Rapid Transit Company (IRT) and Brooklyn Rapid Transit Company (BRT), and the underground IND station at Jackson Heights–Roosevelt Avenue, built for the Independent Subway System (IND). The elevated station was built as part of the Dual Contracts and opened on April 21, 1917; the station was also served by the BRT and its successor, the Brooklyn–Manhattan Transit Corporation, until 1949. The IND station opened on August 19, 1933, and was the terminus of the Queens Boulevard Line until 1936. Escalators between the two stations were installed in the 1950s, and the complex was substantially rebuilt between 2000 and 2005.

The Independent Subway System (IND; formerly the ISS) was a rapid transit rail system in New York City that is now part of the New York City Subway. It was first constructed as the Eighth Avenue Line in Manhattan in 1932. It was originally also known as the Independent City-Owned Subway System (ICOSS) or the Independent City-Owned Rapid Transit Railroad (ICORTR).

One of three subway networks that became part of the modern New York City Subway, the IND was intended to be fully owned and operated by the municipal government, in contrast to the privately operated or jointly funded Interborough Rapid Transit Company (IRT) and Brooklyn–Manhattan Transit Corporation (BMT) companies. It was merged with these two networks when the subway system was unified in 1940.

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 (running under Broadway, 42nd Street, Park Avenue, and Lafayette Street), 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

Planning for a rapid transit line in New York City started in 1894 with the enactment of the Rapid Transit Act. The plans were drawn up by a team of engineers led by William Barclay Parsons, chief engineer of the Rapid Transit Commission. The city government started construction on the first IRT subway in 1900, leasing it to the IRT for operation under Contracts 1 and 2. After the initial line was opened, several modifications and extensions were made in the 1900s and 1910s.

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.

It is shown in the color purple on station signs, the official subway map, and internal route maps in R188 cars. Before the line was opened all the way to Flushing in 1928, it was known as the Corona Line or Woodside and Corona Line. Prior to the discontinuation of BMT services in 1949, the portion of the IRT Flushing Line between Times Square and Queensboro Plaza was known as the Queensboro Line. Since the mid-2010s, the line's signal system has been converted to an automated system.

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.

Most of the lines of the present-day New York City Subway were built or reconstructed under these contracts. The contracts were "dual" in that they were signed between the City and two separate private companies. Both the IRT and BRT (later Brooklyn–Manhattan Transit Corporation, or BMT) worked together to make the construction of the Dual Contracts possible.

The IRT Ninth Avenue Line, often called the Ninth Avenue Elevated or Ninth Avenue El, was the first elevated railway in New York City. It opened in July 1868 as the West Side and Yonkers Patent Railway, as an experimental single-track cable-powered elevated railway from Battery Place, at the south end of Manhattan Island, northward up Greenwich Street to Cortlandt Street. By 1879 the line was extended to the Harlem River at 155th Street. It was electrified and taken over by the Interborough Rapid Transit Company in 1903.

The main line ceased operation in June 1940, after it was replaced by the IND Eighth Avenue Line which had opened in 1932. The last section in use, over the Harlem River, was known as the Polo Grounds Shuttle. It closed in August 1958. This portion used a now-removed swing bridge called the Putnam Bridge, and went through a still-extant tunnel with two partially underground stations.

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.