6 (New York City Subway service)

The 6 Lexington Avenue Local and <6> Pelham Bay Park Express are two rapid transit services in the A Division of the New York City Subway. Their route emblems, or "bullets", are colored forest green since they use the IRT Lexington Avenue Line in Manhattan. Local service is denoted by a (6) in a circular bullet, and express service is denoted by a <6> in a diamond-shaped bullet. On the R62A rolling stock, this is often indicated by LEDs around the service logo to indicate local or express service to riders. The LEDs illuminate in a green circle pattern for 6 local trains and in a red diamond pattern for <6> trains.

6 trains operate local at all times between Pelham Bay Park in the Bronx and Brooklyn Bridge–City Hall in Lower Manhattan. During weekdays in the peak direction, <6> Pelham Express trains replace 6 local trains north of Parkchester, and run express between that station and Third Avenue–138th Street. During this time, 6 Pelham Local trains short turn at Parkchester (except for peak-direction <6> Express trains that return in the opposite direction as 6 Local trains). Weekdays from 9:00 to 11:00 a.m., select Manhattan-bound <6> trains run local from Parkchester to Hunts Point Avenue while select Parkchester-bound 6 trains run express in that section.

The 6 in its current format has run since the implementation of the IRT "H" system in 1918. Since 1920, it has remained largely unchanged, running between Pelham Bay Park and City Hall with a peak-express variant in the Bronx. In 1945, the city closed the City Hall Loop station, the 6's former southern terminal in Manhattan. Since then, most 6 trains have terminated at Brooklyn Bridge, with a few exceptions in later years. In 2023, the 6 was the busiest route in the subway system, carrying around 140 million passengers.