Construction and opening Planning for a
subway line in New York City dates to 1864. The subway plans were drawn up by a team of engineers led by
William Barclay Parsons, the Rapid Transit Commission's chief engineer. It called for a subway line from
New York City Hall in
lower Manhattan to the
Upper West Side, where two branches would lead north into
the Bronx. A plan was formally adopted in 1897, in which it would construct the subway and maintain a 50-year operating lease from the opening of the line. The 18th Street station opened on October 27, 1904, as one of the original 28 stations of the New York City Subway from
City Hall to
145th Street on the
Broadway–Seventh Avenue Line. the station was served by local trains along both the West Side (now the Broadway–Seventh Avenue Line to
Van Cortlandt Park–242nd Street) and East Side (now the
Lenox Avenue Line). West Side local trains had their southern terminus at City Hall during rush hours and
South Ferry at other times, and had their northern terminus at 242nd Street. East Side local trains ran from City Hall to
Lenox Avenue (145th Street). To address overcrowding, in 1909, the
New York Public Service Commission proposed lengthening the platforms at stations along the original IRT subway. As part of a modification to the IRT's construction contracts made on January 18, 1910, the company was to lengthen station platforms to accommodate ten-car express and six-car local trains. In addition to $1.5 million (equivalent to $ million in ) spent on platform lengthening, $500,000 (equivalent to $ million in ) was spent on building additional entrances and exits. It was anticipated that these improvements would increase capacity by 25 percent. Platforms at local stations, such as the 18th Street station, were lengthened by between . Both platforms were extended to the north and south. In December 1922, the Transit Commission approved a $3 million project to lengthen platforms at 14 local stations along the original IRT line, including 18th Street and seven other stations on the Lexington Avenue Line. Platform lengths at these stations would be increased from . The commission postponed the platform-lengthening project in September 1923, at which point the cost had risen to $5.6 million. The closing of this station was proposed as early as 1928. The city government took over the IRT's operations on June 12, 1940. The station closed on November 8, 1948. The platforms at 23rd Street had been lengthened, with entrances at 22nd Street, and the 18th Street station was close to the
14th Street–Union Square station. == Station layout ==