3 (New York City Subway service)
The line 3 and Seventh Avenue Express is a subway line of the New York City Subway. The sign is tomato in the stations and on the official subway map, since it Through Manhattan IRT Broadway - Seventh Avenue Line used.
The 3 runs 24/7 between the 148th Street in Harlem and Times Square - 42nd Street in Manhattan. During the day runs the 3 next to New Lots Avenue in Brooklyn, where the line runs at night 4
The route runs through the IRT Lenox Avenue Line and the IRT Broadway - Seventh Avenue Line in Manhattan and on the IRT Eastern Parkway Line and IRT New Lots Line in Brooklyn.
The operation of the line is shown in detail here: