Despite being leased to the New York Municipal Railway, all the new lines were operated by the elevated company - the New York Consolidated Railroad. The following construction was done under Contract 4: Broadway Subway, Lower Manhattan to Long Island City, Queens Canal Street Subway, Lower Manhattan Centre Street Loop Subway, Lower Manhattan Gravesend Avenue Elevated, Coney Island, Brooklyn to Sunset Park, Brooklyn Eastern District Subway, Midtown Manhattan to East New York, Brooklyn Fourth Avenue Subway, Bay Ridge, Brooklyn to Downtown Brooklyn New Utrecht Avenue Elevated, Coney Island, Brooklyn to Sunset Park, Brooklyn Trackage rights over the Astoria Elevated and Corona Elevated in Queens, leased to the Interborough Rapid Transit Company The following construction was done at the New York Municipal Railway's own expense: Brighton Beach Elevated reconstruction, Coney Island Flatbush Avenue Subway, Prospect Park, Brooklyn to Downtown Brooklyn Jamaica Avenue Elevated, Cypress Hills, Brooklyn to Jamaica, Queens Liberty Avenue Elevated, City Line, Brooklyn to Ozone Park, Queens Lutheran Cemetery Elevated, Ridgewood, Queens to Middle Village, Queens Sea Beach Line reconstruction (depressed), Coney Island to Bay Ridge, Brooklyn Stillwell Avenue Terminal at Coney Island Express (third) track on the Broadway Elevated, Fulton Street Elevated, and Myrtle Avenue Elevated BMT (1923–1940) The New York Consolidated Railroad and New York Municipal Railway were merged in June 1923, the same month that the Brooklyn Rapid Transit Company was reorganized as the Brooklyn–Manhattan Transit Corporation, to form the New York Rapid Transit Corporation.The remaining Contract 4 lines were soon completed. On June 1, 1940, the New York City Board of Transportation took over operations. BMT services were assigned numbers in 1924, which appeared only on the fronts of trains and in schedules. In 1960, the New York City Transit Authority brought the BMT into the IND letter system, and most services were reassigned as letters. Since then, many changes have been made; see the individual articles about the letters for more detail, and New York City Subway nomenclature for more general information. Terminals shown in the table below are pre-letters. This chart shows the letter code assigned to each BMT service in 1960; important changes happened on a few lines between then and when the letters were first publicly used. While the BMT number code was officially retired in the 1960s, two of these markers would continue to appear on equipment until as late as the early 1980s. For instance the BMT 7 marker