Three services in the New York City Subway are designated as a S (shuttle) service. These services operate as full-time or almost full-time shuttles. In addition, three services run as shuttles during late night hours but retain their regular service designations. Shuttle services Official designations All of the following services are officially labeled S. The "NYCT designator" column stands for New York City Transit's internal designation for the service. Late-night shuttles Former uses Other routes have in the past been designated S or SS; the label has also been used for temporary shuttles due to construction. Before June 1979, all shuttles had the label SS; the designation S was reserved for "special"' services, including IND trains to Aqueduct Racetrack. The SS label was first applied in 1967, when all services were labeled due to the completion of the Chrystie Street Connection. Former uses of the S or SS designation include: Bowling Green – South Ferry Shuttle (1909–1977) Culver Shuttle (1954–1975) Sixth Avenue Shuttle (1986–1988) – ran between 57th Street and Grand Street 63rd Street Shuttle (1998–1999) Grand Street Shuttle (2001–2004) Brighton Shuttle (2022) – ran between Prospect Park and Coney Island Some shuttle routes also used the H or HH designation, which were the last to be assigned to the Independent Subway System. Former uses include the Court Street Shuttle from 1936 to 1946 and Rockaway Park Shuttle until 1993, when that route's label was changed to a blue S. A temporary shuttle that opened in November 2012 after Hurricane Sandy destroyed track connecting the Rockaways to the rest of the system used the H designation. When the Transit Authority began assigning labels to all services, the Third Avenue Elevated was designated as 8 because it was deemed too long to be considered a "shuttle". However, trains on this line showed SHUTTLE on their rollsigns instead of "8". The service was discontinued in 1973. Full-time shuttles Nassau Street Shuttle (1999) This shuttle ran only from May to September 1999 during the rehabilitation of the Williamsburg Bridge. The shuttle ran from 6:00 am to 10:00 pm daily from Essex Street to Broad Street (Chambers Street on weekends, late nights, and evenings). Myrtle Shuttle (2017–2018) Two trains operated separately on each of two tracks on the BMT Myrtle Avenue Line between Myrtle-Wyckoff Avenues and Middle Village-Metropolitan Avenue. They ran at all times between September 2, 2017, and April 27, 2018, due to