The Red Line is a rapid transit line operated by the Massachusetts Bay Transportation Authority (MBTA) as part of the MBTA subway system. The line runs south and east underground from Alewife station in North Cambridge through Somerville and Cambridge, surfacing to cross the Longfellow Bridge then returning to tunnels under Downtown Boston. It continues underground through South Boston, splitting into two branches on the surface at JFK/UMass station. The Ashmont branch runs southwest through Dorchester to Ashmont station, where the connecting light rail Ashmont–Mattapan High Speed Line continues to Mattapan station. The Braintree branch runs southwest through Quincy and Braintree to Braintree station.
The Ashmont–Mattapan High-Speed Line, commonly referred to as the Mattapan Trolley, is a partially grade-separated light rail line which forms part of the MBTA's Red Line rapid transit line. The line, which runs through Boston and Milton, Massachusetts, opened on August 26, 1929, as a conversion of a former commuter rail line. It exclusively uses PCC streetcars built in the 1940s. Passengers must transfer at Ashmont to access the rest of the Red Line, which uses heavy rail metro rolling stock.
Park Street station is an MBTA subway station in Boston, Massachusetts. It is located at the intersection of Park Street and Tremont Street at the eastern edge of Boston Common in Downtown Boston. One of the two oldest stations on the "T", Park Street is the transfer point between the Green and Red lines, as one of the quartet of "hub stations" on the MBTA subway system. Park Street is the fifth-busiest station in the MBTA network, with an average of 16,571 entries each weekday in FY2019.
JFK/UMass station is a Massachusetts Bay Transportation Authority (MBTA) intermodal transfer station, located adjacent to the Columbia Point area of Dorchester, Boston, Massachusetts. It is served by the rapid transit Red Line; the Greenbush Line, Kingston/Plymouth Line, and Middleborough/Lakeville Line of the MBTA Commuter Rail system, and three MBTA bus routes. The station is named for the John F. Kennedy Presidential Library and Museum and the University of Massachusetts Boston, both located nearby on Columbia Point.
Key bus routes of the Massachusetts Bay Transportation Authority (MBTA) system are 15 routes that have high ridership and higher frequency standards than other bus lines, according to the 2004 MBTA Service Policy. Together, they account for roughly 40% of the MBTA's total bus ridership. These key bus routes ensure basic geographic coverage with frequent service in the densest areas of Boston, and connect to other MBTA services to give access to other areas throughout the region.
As with many large cities, a large number of Boston-area streetcar lines once existed, and many continued operating into the 1950s. However, only a few now remain, namely the four branches of the Green Line and the Ashmont–Mattapan High-Speed Line, with only one running regular service on an undivided street.
Ashmont station is a Massachusetts Bay Transportation Authority (MBTA) intermodal transit station located at Peabody Square in the Dorchester neighborhood of Boston, Massachusetts. It is the southern terminus of the Ashmont branch of the rapid transit Red Line, the northern terminus of the connecting light rail Ashmont–Mattapan High-Speed Line, and a major terminal for MBTA bus service. Ashmont has two side platforms serving the below-grade Red Line and a single side platform on an elevated balloon loop for the Mattapan Line. The station is fully accessible for all modes.
The Massachusetts Bay Transportation Authority (MBTA) maintains a large public transit system in the Boston, Massachusetts area, and uses various methods to name and number their services for the convenience of users.
Mattapan station is an MBTA light rail station in Boston, Massachusetts. It is the southern terminus of the Ashmont–Mattapan High-Speed Line, part of the Red Line, and is also an important MBTA bus transfer station, with eight routes terminating there. It is located at Mattapan Square in the Mattapan neighborhood. At the station, streetcars use a balloon loop to reverse direction back to Ashmont station. Mattapan station is fully accessible, with mini-high platforms.
Andrew station is a rapid transit station in Boston, Massachusetts. Located at Andrew Square in South Boston, it serves the MBTA Red Line and the MBTA bus system. Named for John Albion Andrew, the square is at the intersection of several major thoroughfares: Dorchester Avenue, Dorchester Street, Southampton Street, and Boston Street. Andrew is the primary transfer point between the Red Line subway and the MBTA surface bus routes into South Boston. Opened in 1918 and renovated in 1990–1994, it is fully accessible.
Savin Hill station is a rapid transit station in Boston, Massachusetts. It serves the Ashmont branch of the MBTA's Red Line. It is located at 121 Savin Hill Avenue adjacent to Sydney Street in the Savin Hill area of the Dorchester neighborhood. Opened in 1845 as a commuter rail station, Savin Hill was converted to rapid transit in 1927 and rebuilt in 2004–05 for accessibility. Averaging 2,199 daily boardings by a FY 2019 count, Savin Hill is the least-used station on the Red Line.
Quincy Center station is an intermodal transit station in Quincy, Massachusetts. It is a transfer station between the MBTA Red Line subway, MBTA Commuter Rail's Old Colony Lines and Greenbush Line, and a number of MBTA bus routes. It is located between Hancock Street and Burgin Parkway in the Quincy Center district. Opened in 1971, the station was covered by a large parking garage which was closed in 2012 due to structural problems and removed several years later. The station is accessible on all modes.
Broadway station is a subway station in Boston, Massachusetts. It serves the MBTA's Red Line. It is located at the intersection of Dorchester Avenue and Broadway in South Boston. It was opened on December 15, 1917, as part of the Dorchester Extension from Downtown Crossing to Andrew. The station has a single island platform to serve the two tracks.
Suffolk Downs station is a rapid transit station on the Massachusetts Bay Transportation Authority (MBTA) Blue Line, located on the east side of Orient Heights in East Boston, Massachusetts, United States. It is named for the now-defunct Suffolk Downs racetrack, located just to the north. Suffolk Downs station has two side platforms, with a footbridge structure of brick, concrete, and steel connecting them. The station is accessible. With just 521 daily boardings in FY 2019, Suffolk Downs is the least-used fare-controlled station on the MBTA subway system.
The Massachusetts Bay Transportation Authority (MBTA) operates rapid transit, light rail, and bus rapid transit services in the Boston metropolitan area, collectively referred to as the rapid transit, subway, or the T system.
Shawmut station is a subway station in Boston, Massachusetts. It serves the Ashmont branch of the MBTA's Red Line. It is located on Dayton Street in the Dorchester neighborhood. The station, the only underground station on the Red Line south of Andrew station, sits in a shallow cut-and-cover subway tunnel that runs from Park Street south to Peabody Square where it surfaces at Ashmont station. Shawmut opened along with Ashmont on September 1, 1928, as part of a southward extension of the Cambridge–Dorchester line.
Milton station is a light rail station in Milton, Massachusetts. Located in the Dorchester-Milton Lower Mills Industrial District, it serves the MBTA's Ashmont–Mattapan High-Speed Line. This station is accessible via wooden ramps on both platforms.
Cedar Grove station is a light rail station on the Ashmont–Mattapan High Speed Line located in the southern part of the Dorchester neighborhood of Boston, Massachusetts. The station, named for the adjacent Cedar Grove Cemetery, has two side platforms serving the line's two tracks. It is accessible via wooden ramps on both platforms.
Butler station is a light rail station in Boston, Massachusetts. It serves the MBTA Ashmont–Mattapan High-Speed Line. It is located at Butler Street in the Lower Mills section of the Dorchester neighborhood. It serves a small residential area sandwiched between the Neponset River, Cedar Grove Cemetery, and Dorchester Park. Butler station has no MBTA bus connections. It is accessible via a wooden mini-high ramp on the station's single island platform.
Central Avenue station is a light rail station located off Central Avenue near Eliot Street in Milton, Massachusetts. It serves the Ashmont–Mattapan High Speed Line, a branch of the MBTA Red Line. Central Avenue consists of two side platforms which serve the Ashmont–Mattapan High Speed Line's two tracks.
MBTA bus: 15, 17, 18, 19, 201, 202, 210 
