the 42nd Street Shuttle. The system would be changed from looking like a "Z" system on a map to an "H" system. One trunk would run via the new Lexington Avenue Line down Park Avenue, and the other trunk would run via the new Seventh Avenue Line up Broadway. In order for the line to continue down Varick Street and West Broadway, these streets needed to be widened, and two new streets were built, the Seventh Avenue Extension and the Varick Street Extension. It was predicted that the subway extension would lead to the growth of the Lower West Side, and to neighborhoods such as Chelsea and Greenwich Village. Cortlandt Street opened as part of an extension of the line from 34th Street–Penn Station to South Ferry on July 1, 1918. Initially, the station was served by a shuttle running from Times Square to South Ferry. The new "H" system was implemented on August 1, 1918, joining the two halves of the Broadway–Seventh Avenue Line and sending all West Side trains south from Times Square. An immediate result of the switch was the need to transfer using the 42nd Street Shuttle in order to retrace the original layout. The completion of the "H" system doubled the capacity of the IRT system. The station was built at the intersection of Cortlandt and Greenwich Streets, in a part of Lower Manhattan nicknamed "Radio Row" because of the many electronics dealers on the street. It had a standard two side platform layout with two tracks. There were mosaic decorations by Squire J. Vickers or Herbert Dole depicting ships along each platform's wall. Red i-beam columns ran along the entire length of both platforms at regular intervals with every other column having the standard black station name plate in white lettering; the name plates alternated between "Cortlandt Street" and "World Trade Center". 20th century The city government took over the IRT's operations on June 12, 1940. On August 9, 1964, the New York City Transit Authority (NYCTA) announced the letting of a $7.6 million contract to lengthen platforms at stations from Rector Street to 34th Street–Penn Station on the line, including Cortlandt Street, and stations from Central Park North–110th Street to 145th Street on the Lenox Avenue Line to allow express trains to be lengthened from nine-car trains to ten-car trains, and to lengthen locals from eight-car trains to ten-car trains. With the completion