The West End Line has had an express (on the BMT Fourth Avenue Line) service – labeled 3 in 1924 – since it opened in 1916, passing over the Manhattan Bridge and onto the BMT Broadway Line express tracks. In the late 1950s, midday trains were switched to the local Fourth Avenue tracks and through the Montague Street Tunnel, and late night and Sunday service became a shuttle between Coney Island and 36th Street. The express and local services were assigned the designations ' and ' in the early 1960s. With the opening of the Chrystie Street Connection in late 1967, the train from Manhattan was extended to Coney Island, absorbing the T and TT (both ran express on Fourth Avenue). The TT late night and Sunday shuttle survived until 1968, when the B became full-time. It ran local on Fourth Avenue during late night hours, but express at all other times. Late night operation was cut back to a shuttle to 36th Street in 1976.