IRT Second Avenue Line
The IRT Second Avenue Line, also known as the Second Avenue El, was an elevated railway in Manhattan, New York City, United States, operated by the Interborough Rapid Transit Company until city takeover in 1940. It ended service on June 13, 1942, although the portion north of the 57th Street closed on June 11, 1940, with the city takeover.
The commission also granted the Gilbert Elevated Railway Company the right to operate the Sixth Avenue Elevated and soon afterward the Gilbert Elevated Railway change its name to the Metropolitan Elevated Railway.
A third track was added to the line between 1914 and 1916. The additional track made possible express service on the line during peak hours.
The Second Avenue El did not run entirely on Second Avenue. Its southern terminus was City Hall, and it continued to Chatham Square, where it junctioned with the Third Avenue El and ran along Division Street and then Allen Street. At Houston Street it ran north on First Avenue, where it turned left on 23rd Street ran north on Second Avenue to 129th Street. At that point it joined with the Third Avenue El and crossed the Harlem River into the Bronx. 
The M15 bus, which runs along much of the IRT Second Avenue Elevated Line's route, carries more passengers than any other route in New York City. However, it does not carry as many passengers as a rapid transit line, and does not allow for interchange within rapid transit stations. A replacement rapid transit route, the Second Avenue Subway has been under consideration since before the demolition of the IRT Second Avenue Line, and is under construction as of 2013. The first phase is scheduled to open in December 2016.
|Merges with IRT Third Avenue Line|
|125th Street||all||After the line opened|
|105th Street||local||After the line opened|
|65th Street||local||March 1, 1880|
|Branch over Queensboro Bridge to Queensboro Plaza leaves at 59th Street|
|42nd Street||all||March 1, 1880|
|34th Street||local||Transfer to branch to 34th Street Ferry|
|23rd Street||local||March 1, 1880|
|14th Street||all||March 1, 1880|
|Eighth Street||local||March 1, 1880|
|First Street||local||March 1, 1880|
|Rivington Street||local||March 1, 1880|
|Grand Street||local||March 1, 1880|
|Canal Street||local||March 1, 1880|
|Chatham Square||all||March 1, 1880||Transfer to Third Avenue Line and branch to City Hall|
|Merges with IRT Third Avenue Line|
|Franklin Square||all||August 26, 1878|
|Fulton Street||all||August 26, 1878|
|Hanover Square||all||August 26, 1878|
|Merges with IRT Ninth Avenue Line|
|South Ferry||all||August 26, 1878|
- Staff. "Second Avenue 'El' Coming to a Stop", The Christian Science Monitor, June 13, 1942. Accessed October 12, 2008.
- Rapid Transit in New York City and in Other Great Cities. prepared by the Chamber of Commerce of the State of New York. 1905. p. 52. Retrieved 2009-02-11.
- Red Book Information Guide to New York. Interstate Map Co. 1935.
- "More Elevated Facilities, the Second Avenue Line and City Hall Branch Opened" (PDF). The New York Times Company. 2 March 1880. p. 3. Retrieved 21 February 2009.
- "Rapid Transit on the Bowery" (PDF). The New York Times Company. 26 August 1878. p. 8. Retrieved 10 February 2009.
- "Second Avenue El in Manhattan". By NJI Publishing with text provided by Joe Cunningham. 1995. ISBN 0-934088-33-0
- The 2nd Avenue Elevated - nycsubway.org
- Fallen Transit: The Loss of Rapid Transit on New York's Second Avenue
- 100 Years Ago on Second Avenue - The Launch Box Blog
- Time Traveling on the Second Avenue El