List of New York City Subway inter-division connections - Definition

The New York City Subway was formed from three different systems, the IRT, BMT and IND. For operational purposes, the IRT is A Division and the BMT and IND make B Division; however, common usage calls the three systems divisions. Over the years, various connections have been built to allow trains of one division to operate on the lines of another.

Revenue connections

Because the IRT system uses narrower tunnels and cars than the BMT and IND, the only possible inter-division revenue connections are between BMT and IND lines. The following connections have been built:

• October 30, 1954: IND South Brooklyn Line joined to BMT Culver Line (now all part of the Culver Line)
• December 1, 1955: 60th Street Tunnel Connection between the IND Queens Boulevard Line and the BMT 60th Street Tunnel
• April 29, 1956: IND Fulton Street Line joined to BMT Liberty Avenue Elevated (part of the Fulton Street Elevated, but disconnected from the BMT system and so is only used for IND service
• November 26, 1967: Chrystie Street Connection between the IND Sixth Avenue Line and the BMT Nassau Street Line (over the Williamsburg Bridge) and Fourth Avenue Line (via the Manhattan Bridge) - Williamsburg Bridge connection no longer used for revenue service
• October 29, 1989: Spur from IND 63rd Street Line to BMT BMT-Broadway Line (not currently used for revenue service)

Non-revenue connections

These connections mainly take place in yards:

• Crossover tracks between northbound IRT Flushing Line and BMT Astoria Line at Queensboro Plaza (the Flushing Line's only connection to the rest of the system, originates from when both lines north of Queensboro Plaza were dual-operated)
• IRT Eastern Parkway Line and BMT Canarsie Line both have tracks to Linden Shops
• IRT Broadway-Seventh Avenue Line and IND Eighth Avenue Line both have tracks to 207th Street Yard
• IRT Jerome Avenue Line and IND Concourse Line both have tracks to Concourse Yard