In the mid-1980s, the MBTA spent $80 million to extend the platforms of seven underground Red Line stations and three Orange Line stations to allow the use of six-car trains. Contracts for Broadway and three other stations were awarded on December 18, 1985, with a groundbreaking held on February 13, 1986. The Broadway work cost $7.9 million, with the platform extended by . Six-car trains entered service on January 21, 1988. A new entrance east of Dorchester Avenue opened on February 16, 1988, and the project was completed on October 26, 1989. Elevators were installed during the project, making Broadway one of the first older stations on the system to be modified for accessibility.