A 1979 renovation of Park Street added two elevators, making it the first accessible station on the Red Line.
In the early 1980s, the MBTA began extending platforms for six-car trains: Ashmont and Shawmut in 1981, Charles/MGH in 1982, and Fields Corner and Savin Hill in the mid-1980s. (
The Northwest and South Shore extensions had been built for longer trains, while JFK/UMass had been modified in 1970.)
In the mid-1980s, the MBTA spent $80 million to extend the platforms of seven underground Red Line stations (Central, Kendall/MIT, Park Street, Washington, South Station, Broadway, and Andrew) and three Orange Line stations.
Six-car trains entered service on January 21, 1988.

Central, Kendall/MIT, Park Street, and Downtown Crossing (renamed from Washington in 1987) were completed in 1988.
A major reconstruction of JFK/UMass added a platform for the Braintree Branch, which opened on December 14, 1988.
Renovations to Broadway were completed in October 1989.
Quincy Adams and Braintree were accessible by 1989, if not from their original construction.
South Station was completed around 1992, followed by Andrew in 1994.

The 1990 passage of the Americans with Disabilities Act spurred the renovation of additional stations.
Quincy Center was modified in 1991, followed by North Quincy in 1998.
Charles/MGH was rebuilt from 2003 to 2007.
The agency began design for the four Ashmont Branch stations in 2001.
Savin Hill was closed from May 2004 to July 31, 2005 for reconstruction.
It was followed by the completion of the rebuilt Fields Corner station in 2008, the modified Shawmut in 2009, and the rebuilt Ashmont in 2011.
The final Red Line station to be modified for accessibility was Wollaston, which was closed from January 2018 to August 2019 for a complete reconstruction.
A 1979 renovation of Park Street added two elevators, making it the first accessible station on the Red Line. In the early 1980s, the MBTA began extending platforms for six-car trains: Ashmont and Shawmut in 1981, Charles/MGH in 1982, and Fields Corner and Savin Hill in the mid-1980s. (The Northwest and South Shore extensions had been built for longer trains, while JFK/UMass had been modified in 1970.) In the mid-1980s, the MBTA spent $80 million to extend the platforms of seven underground Red Line stations (Central, Kendall/MIT, Park Street, Washington, South Station, Broadway, and Andrew) and three Orange Line stations. Six-car trains entered service on January 21, 1988. 
Central, Kendall/MIT, Park Street, and Downtown Crossing (renamed from Washington in 1987) were completed in 1988. A major reconstruction of JFK/UMass added a platform for the Braintree Branch, which opened on December 14, 1988. Renovations to Broadway were completed in October 1989. Quincy Adams and Braintree were accessible by 1989, if not from their original construction. South Station was completed around 1992, followed by Andrew in 1994.
The 1990 passage of the Americans with Disabilities Act spurred the renovation of additional stations. Quincy Center was modified in 1991, followed by North Quincy in 1998. Charles/MGH was rebuilt from 2003 to 2007. The agency began design for the four Ashmont Branch stations in 2001. Savin Hill was closed from May 2004 to July 31, 2005 for reconstruction. It was followed by the completion of the rebuilt Fields Corner station in 2008, the modified Shawmut in 2009, and the rebuilt Ashmont in 2011. The final Red Line station to be modified for accessibility was Wollaston, which was closed from January 2018 to August 2019 for a complete reconstruction.
Red Line (MBTA)