The location of the South Brooklyn Railway helped in the construction of new BRT subway and elevated lines in Brooklyn, as materials could be brought in via its trackage. A temporary connection at 38th Street and Fourth Avenue allowed South Brooklyn Railway equipment to enter the BMT Fourth Avenue Line construction site. In June 1922, the South Brooklyn Railway bought much of the LIRR-owned Prospect Park & Coney Island Railroad. By 1923, the Prospect Park & Coney Island Railroad and the New York & Coney Island Railroad were merged into the South Brooklyn Railway. The BRT filed bankruptcy that year and was reorganized into the Brooklyn–Manhattan Transit Corporation, which still operated the South Brooklyn Railway.