12, 1986. Local media was critical of Guilford during the strike; the company did not bid for a renewal of the commuter rail operating contract, which expired at the end of 1986. Amtrak won the contract for commuter rail operations and took over the system on January 1, 1987. Gardner service was cut back to Fitchburg at that time due to a dispute between Amtrak, Guilford, and the MBTA. Expansions The late 1980s saw the beginning of substantial expansion of the system. The Southwest Corridor project was completed in 1987 with a new below-ground alignment for commuter rail, Amtrak, and Orange Line trains. Back Bay and stations were completely rebuilt as transfer stations, and opened to serve the growing Longwood Medical Area. The Needham Line, closed since 1979 for construction, was reopened. The Attleboro and Franklin lines had been diverted over the previously freight-only Dorchester Branch during construction; after they returned to the Southwest Corridor, a shuttle service was retained as the Fairmount Line. Peak-hour service to Providence resumed in 1988 (with off-peak and weekend service later added); was added in 1990 as a park-and-ride station to replace . The Franklin Line was extended to in 1988; infill stations in that era included in 1988 to serve Boston Red Sox games at Fenway Park, and in 1990. Massachusetts had state accessibility laws since 1977 – prior to 1990 federal legislation. At times, the MBTA clashed with state regulators: several stations including West Natick and Chelsea were built without accessible platforms despite state rules; the latter resulted in fines from the Massachusetts Architectural Access Board (MAAB). The opening of South Attleboro was delayed by the MAAB because of the MBTA's refusal to build full-length high-level platforms. However, the MBTA did slowly increase accessibility of the system. Most Ipswich/Rockport line stations were made accessible during the 1984–85 closure, and renovations followed at other stations. South Station was made accessible in the late 1980s, Back Bay during the Southwest Corridor project, and North Station in the early 1990s, providing accessibility at the main downtown Boston stations. By 1992, 44 commuter rail stations were accessible. In 1991, the state agreed to build a set of transit projects as part of the settlement of a lawsuit by the Conservation Law Foundation (CLF) over auto emissions from the Central Artery/Tunnel Project (Big Dig). Among these project were extensions of the Framingham Line to Worcester and the