the two platforms are opposite each other for a few feet. Passengers must walk down the express platform to the southernmost staircase, go up to a different part of the mezzanine, crossover, and then go down a staircase to the northern end of the local platform. This complex transfer is to allow a continued underground mezzanine outside of fare control from the southern end at the World Trade Center, which is just one block west of the Fulton Street station on the IND Eighth Avenue Line, to the most northern street stairs at Chambers and Church Street, which is just one block east of the Chambers Street station of the IRT Broadway–Seventh Avenue Line. The total length of the mezzanine is seven blocks. Chambers Street The Chambers Street station comprises the through platform. Just north of Chambers Street is a third track between the uptown and downtown express tracks, with connecting switches at both ends, which was used to turn trains when Chambers Street was used as a terminal, before the Broadway–Nassau Street (now Fulton Street) station opened on February 1, 1933. It is served by the and trains. This platform is not wheelchair-accessible, although it can possibly gain accessibility in the future because the elevator to the local platform leads to the mezzanine that is shared with this station. However, it is one block away from the Chambers Street station on the IRT Broadway–Seventh Avenue Line, which is wheelchair-accessible. World Trade Center The terminating platform is named the World Trade Center station. It is served by the train. Southbound local trains reach the platform by ramping underneath the express tracks south of Canal Street station. The northern end of the World Trade Center station has a signal tower and a diamond crossover switch that are roughly at the middle of the through-platform. The local tracks end at bumper blocks at the south end of the platform. In addition, there is a platform-level passageway on the western side of the station toward the platform's south end, evidence of a former half-length side platform for the western track; while in passenger use as a connection to the rest of the station, the former platform is now fenced off from the rest of the local platform level, and passengers must now use the mezzanine to access the island platform. A connection to the World Trade Center Transportation Hub is also available at