The 23rd Street station is a local station on the IND Sixth Avenue Line of the New York City Subway, located at the intersection of 23rd Street and Sixth Avenue (Avenue of the Americas) in Manhattan. It is served by the F train at all times, the M train during weekdays, and by the <F> train during rush hours in the peak direction. This station and 14th Street are the only two local stations on the Sixth Avenue Line. The 23rd Street station of the IND Sixth Avenue Line shares entrances with the 23rd Street station of the PATH, which is located in between this station's two platforms. History In 1924, the Independent Subway System (IND) submitted its list of proposed subway routes to the New York City Board of Transportation, which included the construction of the IND Sixth Avenue Line. The Board approved the program. As part of the construction of the line, the Hudson and Manhattan Railroad's (now PATH) 23rd Street station had to be rebuilt to provide space for the Sixth Avenue Line's 23rd Street stop, which was to be built at the same level as the Hudson and Manhattan's stop.</p>This station opened on December 15, 1940, as local subway service began on Sixth Avenue from the West Fourth Street subway station to the 47th–50th Streets station, with track connections to the IND 53rd Street Line. The Sixth Avenue Line's construction cost $59.5 million. Service was originally provided by the , which ran between Norwood–205th Street and Hudson Terminal, and the F, which ran between Parsons Boulevard and Church Avenue. This station replaced the 23rd Street station on the elevated IRT Sixth Avenue Line, which remained open while construction on the Sixth Avenue subway proceeded, but closed in December 1938. Ground was broken for two new express tracks between the West Fourth Street and 34th Street–Herald Square stations on April 19, 1961. The express tracks were built beneath the surface. The construction was done in two portions. The first section was between West 9th and 19th Streets, and the second section was between West 19th and 31st Streets. Although the express tracks, which went into service in 1967, do not serve this station, provisions were incorporated into the design of the tunnel to permit the addition of a future lower level station here without disturbances to train operation. Under the 2015–2019 MTA Capital Plan, this station, along