The IND Fulton Street Line is a rapid transit line of the IND Division of the New York City Subway, running from the Cranberry Street Tunnel under the East River through central Brooklyn to a terminus in Ozone Park, Queens.

The underground portion, which constitutes the majority of the line, was built for the city-owned Independent Subway System (IND), opening between 1936 and 1956.

Prior to December 1988, express service was only provided during rush hours, and before 1999, all trains ran local on weekends and weekday evenings after 9:00 pm.

The four mainline trackways continue east on Pitkin Avenue, disused, and end at approximately Elderts Lane.

[3][6][8] The Fulton Street subway was the city-owned Independent System (IND)'s main line from Downtown Brooklyn to southern Queens.

The groundbreaking for the line was held on April 16, 1929, at Fulton Street and Arlington Place, near the future Nostrand Avenue station.

In October 1930, the roof of the subway tunnel was completed to Vanderbilt Avenue, and the roadbed was ready for the installation of tracks.

The New York City Board of Transportation required four months to pass following the replacement of dirt in excavations before permanent pavement could be installed to allow the soil to settle.

[16][17] The progress lasted only a few years, as all work on the last portions in Brooklyn was stopped by December 1942 shortly after the United States entered World War II, with Broadway−East New York complete but not in operation due to lack of signal equipment, and the remaining stations to Euclid Avenue as unfinished shells.

The badly needed extension to the more efficient terminal at Broadway−East New York (the current Broadway Junction station) opened on December 30, 1946.

[26][27][28] In late 1952, the Board of Transportation began construction on a connection between the IND and both the Fulton El and the Rockaway Beach Branch of the Long Island Rail Road, which included a new underground station at Grant Avenue.

[41] As part of a program to upgrade the signaling of the New York City Subway, the MTA's 2020–2024 Capital Program calls for adding communications-based train control (CBTC) to several more lines, including the IND Fulton Street Line west of the Euclid Avenue station.

[45] CBTC installation on the rest of the Fulton Street Line from Euclid Avenue to Ozone Park–Lefferts Boulevard was proposed as part of the MTA's 2025–2029 Capital Program.

[46][47] Early in the planning of the subway, the city considered recapturing parts of the BMT Jamaica Line,[48] which had been built under the Dual Contracts.

Bellmouths were built into the outer walls of the subway tunnel just east of the Broadway Junction station for a future connection.

The line would have gone as far as Springfield Boulevard in Queens Village or 229th Street in Cambria Heights, both near the Nassau County border.

[5][9][49][50][51] The 1929 Second System plan suggested recapturing and extending the Fulton elevated along Liberty, Brinkerhoff and Hollis Avenues to Springfield Boulevard, near Hempstead Turnpike, Belmont Park, and the Queens Village LIRR Station.

East of Cross Bay Boulevard, another flying junction would bring a two-track branch over the line to a pair of portals north of Aqueduct–North Conduit Avenue station.