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 of this project, the NYCTA project to lengthen IRT stations to accommodate ten-car trains would be complete. Work on the platform extension project took place in 1965 and 1966. During the project, old tiling and mosaics were removed and replaced with the 1970s-style varnished, tan-colored brick tiles. One of the mosaics was preserved in the New York Transit Museum.