J Train (Manhattan Local)

The J Nassau Street Local and Z Nassau Street Express are two rapid transit services in the B Division of the New York City Subway. Their route emblems, or "bullets," are colored brown since they use the BMT Nassau Street Line in Lower Manhattan.

The J operates at all times, while the Z runs as a rush-hour variant with six trips in each peak direction on weekdays. Both services travel through the entirety of the BMT Archer Avenue and Jamaica lines via the Williamsburg Bridge, connecting Jamaica Center–Parsons/Archer in Jamaica, Queens, to Broad Street in Lower Manhattan. When the Z operates, the two services form a skip-stop pair between Sutphin Boulevard–JFK and Myrtle Avenue–Broadway. During rush hours and middays in the peak direction, they run express in Brooklyn between Myrtle Avenue–Broadway and Marcy Avenue, bypassing three stations. At all other times, only the J operates, serving every station on its entire route.