The southbound M11 runs up Broadway until 135th Street, making a right turn there and resuming the regular route.

These trips are out of the Michael J. Quill Depot, and use Xcelsior Diesel and All-Electric buses as well as the Nova Bus LFS HEVs.

[citation needed] The Houston, West Street and Pavonia Ferry Railroad leased the Ninth Avenue Railroad on March 12, 1892, and on December 12, 1893 the HWS&PF was merged into the Metropolitan Street Railway.

[16] Buses were substituted for streetcars by the Eighth Avenue Coach Corporation, a New York Railways subsidiary,[17] on November 12, 1935,[2][18][19] and assigned the number M42.

[20] It was subsequently labeled 11 by the New York City Omnibus Corporation when it gained control in 1936.

[citation needed] The New York City Omnibus Corporation directly took over operations in 1951, and in 1956 it was renamed Fifth Avenue Coach Lines; the Manhattan and Bronx Surface Transit Operating Authority, now a wholly owned subsidiary of the MTA's New York City Transit Authority, replaced it in 1962.

[citation needed] In its first 30 years in bus service, the 11's northern terminus was at La Salle Street and Broadway.

The M11's previous terminal required a U-turn on Broadway, and the extension removed the safety hazard.