J and Z (NYC Subway)

The J Nassau Street Local and Z Nassau Street Express are a pair of NYC Subway services. They run between Lower Manhattan and Jamaica. The Z operates during rush hours in the peak direction. When the Z operates, it and the J run skip-stop between Myrtle Avenue and Sutphin Boulevard-Archer Avenue-JFK Airport stations.

Lines
In Lower Manhattan, the J and Z use the BMT Nassau Street Line. Between the Brooklyn-Manhattan border and 121st Street station, they use the BMT Jamaica Line. East of 121st Street, they use the Archer Avenue Line lower-level tunnel, while the E uses the upper-level tunnel.

Service pattern
All trains are local between Broad Street and Marcy Avenue. During rush hours in the peak direction, all J and Z trains skip Hewes Street, Lorimer Street, and Flushing Avenue, making the M the only service that serves these stations during peak periods. Some rush hour trains begin/end at Broadway Junction.

Skip-stop service starts at Myrtle Avenue station and ends at Sutphin Boulevard-Archer Avenue-JFK Airport station. All trains stop at Sutphin Boulevard and Jamaica Center, the last two stops.

All reverse-peak, off-peak, and weekend trains are fully-local J trains.