In the mid-1980s, the MBTA spent $80 million to extend the platforms of seven Red Line and three Orange Line stations to allow the use of six-car trains. The agency obtained a $22 million federal grant in 1984 to partially fund the , Park Street, and Washington station work. In 1985-86, the platforms at Park Street were extended to the north. Six-car trains began operation on January 21, 1988. The MBTA opened bidding for an additional round of construction in March 1991; a $6 million contract was issued on July 10. The 1993-completed project included elevators to the Green Line sub-passage, completing elevator access to all platforms; however, Green Line trains were not yet accessible. The northbound Green Line headhouse was exit-only until June 20, 1992, when it was converted to also serve as an entrance. Around that time, a new south headhouse was built on the southbound side as the Freedom Trail information center was moved to a new structure nearby.