C trains continue along the Fulton Street Line. History Planning and construction As early as March 1918, soon after the BMT Broadway Line opened to Times Square–42nd Street, plans were being considered for an extension of that line beyond the stubs at 57th Street–Seventh Avenue to the Upper West Side and Washington Heights via Central Park West (Eighth Avenue). On August 3, 1923, the New York City Board of Estimate approved the Washington Heights Line, an extension of the Broadway Line to Washington Heights. The line was to have four tracks from Central Park West at 64th Street under Central Park West, Eighth Avenue, Saint Nicholas Avenue, and private property to 173rd Street, and two tracks under Fort Washington Avenue to 193rd Street. South of 64th Street, one two-track line would connect to the Broadway Line stubs at 57th Street, and another would continue under Eighth Avenue to 30th Street at Penn Station, with provisions to continue downtown. Mayor John Hylan instead wanted to build an independent subway system, operated by the city. The New York City Board of Transportation (NYCBOT) gave preliminary approval to several lines in Manhattan, including one on Eighth Avenue, on December 9, 1924. The main portion of the already-approved Washington Heights Line—the mostly-four track line north of 64th Street—was included, but was to continue north from 193rd Street to 207th Street. South of 64th Street, the plan called for four tracks in Eighth Avenue, Greenwich Avenue, the planned extension of Sixth Avenue, and Church Street. Two tracks would turn east under Fulton Street or Wall Street and under the East River to Downtown Brooklyn. A groundbreaking ceremony was held at St. Nicholas Avenue and 123rd Street on March 14, 1925. Most of the Eighth Avenue Line was dug using a cheap cut-and-cover method, where the street above was excavated. Still, the construction of the line was difficult, as it had to go under or over several subway lines. At 59th Street–Columbus Circle, workers had to be careful to not disrupt the existing IRT Broadway–Seventh Avenue Line overhead. 42nd Street, the longest station along the line at , was expected to be a major express station with large platforms, so the platforms were staggered away from each other in order to avoid going under property lines. Additionally, several workers died in cave-ins during construction. In the summer of 1926 the BOT held a public hearing and