be a crosstown line continuing further west. The tracks were connected to the Broadway Line as it allowed through operation between the Broadway Line and the Fourth Avenue Line in Brooklyn to go into operation more than a year earlier than would otherwise have been possible. From the Canal Street Bridge station, it is possible to see where the line would have continued further west to a terminal near the Hudson River. At the Canal Street local station, the express tracks terminate part of the way into the station, more evidence of the change of plans. The tunnel south of City Hall was rebuilt to bring the upper local tracks down to the lower level north of Vesey Street, and the lower level at City Hall was never used for passenger service. The lower level is currently used for train storage. Unused construction is also present near the west end of the Queensboro Bridge. The original plan there was to build two one-track tunnels under 59th and 60th Streets, rising onto the bridge to Queens. However, on July 28, 1915, the Public Service Commission approved a change of plans requested by the New York City Board of Estimate to place both tracks under 60th Street and cross the East River in the 60th Street Tunnel, because of concern whether or not the bridge could handle the weight of all-steel subway trains. A piece of the 59th Street tunnel had already been built, concurrent with the construction of the IRT Lexington Avenue Line, and became a walkway connecting the two side platforms of the IRT's 59th Street station. North of 57th Street provisions were built to extend the four tracks northwest through Central Park and under Eighth Avenue through the Upper West Side to Inwood, along the route later built as the IND Eighth Avenue Line. The provision existed for many years and would have allowed for a grade-separated junction, allowing Broadway service via 59th Street and Eighth Avenue to coexist. The provisions from two express tracks were connected to the BMT 63rd Street Line in 1989. The provisions from the two local tracks remain unused. South of the Whitehall Street station provisions were built to allow for two future tunnels to Atlantic Avenue in Brooklyn. Opening A short portion of the line, coming off the north side of the Manhattan Bridge through Canal Street to 14th Street–Union Square, opened on