in Manhattan and Astoria in Queens before continuing onto the Long Island Rail Road (LIRR)'s Main Line in Queens. The 76th Street tunnel proposal resurfaced in 1963, though the location of the tunnel was changed several times thereafter. In 1965, the NYCTA finally decided to build the subway tunnel at 63rd Street. The first proposals to bring LIRR service to a terminal in eastern Midtown Manhattan arose in 1963. To facilitate planning for this terminal, a third track was added to the plans for the 63rd Street subway tunnel in April 1966. The track would serve LIRR trains to east Midtown, alleviating train traffic into Penn Station on Manhattan's west side while integrating the LIRR with the subway. A fourth track was added to the plans in August 1966 after it was determined that LIRR trains would be too large to run on subway tracks. This amendment increased the number of LIRR tracks to two, and provided segregated tracks for the LIRR and the subway. In February 1968, the NYCTA's parent company, the Metropolitan Transportation Authority (MTA), released the Program for Action, which proposed numerous improvements to subway, railway, and airport service in the New York metropolitan area. The plan included a new LIRR terminal at a proposed Metropolitan Transportation Center at Third Avenue and 48th Street in East Midtown. It also included connections to Grand Central Terminal, with a new northern entrance leading to the center, and the Second Avenue Subway, among other transit services. The new LIRR line was to branch off from existing lines in Sunnyside, Queens, and enter Manhattan using the new two-level 63rd Street Tunnel. The upper level was to be used by the New York City Subway's 63rd Street lines and the lower level was to be used by the LIRR. According to renderings of the transportation center, the mezzanine would be placed above four island platforms and eight tracks, which would be split evenly across two levels, similar to the present terminal under Grand Central. Construction on the project began in 1969. Four prefabricated sections of the 63rd Street Tunnel were constructed under the East River, the first of which was delivered in May 1971. That first section was lowered into place on August 29, 1971, and the last section was lowered on March 14, 1972. The double-deck, tunnel under the East River was "holed through" on October 10, 1972, with the separate