 South of this station, a pair of bellmouths exists, allowing for a connection to a never-built East River tunnel south of the Montague Street Tunnel, going towards the proposed DeKalb Avenue bypass, using the old LIRR Atlantic Avenue Tunnel or under another street in Brooklyn.Further south is a flying junction joining from Broad Street on the BMT Nassau Street Line ().When this station opened on September 20, 1918, it was the terminal for the Broadway Line.