 The Fourth Avenue station was constructed as part of the Culver (South Brooklyn) Line of the Independent Subway System (IND).One of the goals of Mayor John Hylan's IND, proposed in the 1920s, was a line to Coney Island, reached by a recapture of the BMT Culver Line.As originally designed, service to and from Manhattan would have been exclusively provided by Culver express trains, while all local service would have fed into the IND Crosstown Line.