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 southeast through Quincy and Braintree to Braintree station.
The Green Line is a semi-metro system run by the Massachusetts Bay Transportation Authority (MBTA) in the Boston, Massachusetts, metropolitan area. It is the oldest MBTA subway line, and with tunnel sections dating from 1897, the oldest subway in North America. It runs underground through downtown Boston, and on the surface into inner suburbs via six branches on radial boulevards and grade-separated alignments. With an average daily weekday ridership of 137,700 in 2019, it is the third-most heavily used light rail system in the country. The line was assigned the green color in 1967 during a systemwide rebranding because several branches pass through sections of the Emerald Necklace of Boston.
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.
Kenmore station is an underground light rail station on the MBTA Green Line, located under Kenmore Square in the Fenway/Kenmore neighborhood of Boston, Massachusetts, United States. It is served by the B, C, and D branches of the Green Line. The station has two island platforms, one for each direction. Kenmore is the primary station for Fenway Park, which is 1,000 feet (300 m) to the south. The station opened on October 23, 1932 as a one-station extension of the Boylston Street subway to relieve congestion in the square. It was renovated for accessibility in 2050–2010.
Harvard station is a rapid transit and bus transfer station in Cambridge, Massachusetts. Located at Harvard Square, it serves the MBTA's Red Line subway system as well as MBTA buses. Harvard averaged 18,528 entries each weekday in FY2019, making it the third-busiest MBTA station after Downtown Crossing and South Station. Five of the fifteen key MBTA bus routes stop at the station.
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.
The Boston Elevated Railway (BERy) was a streetcar and rapid transit railroad operated on, above, and below, the streets of Boston, Massachusetts and surrounding communities. Founded in 1894, it eventually acquired the West End Street Railway via lease and merger to become the city's primary mass transit provider. Its modern successor is the state-run Massachusetts Bay Transportation Authority (MBTA), which continues to operate in part on infrastructure developed by BERy and its predecessors.
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.
The Boston-area trolleybus system formed part of the public transportation network serving Greater Boston in the U.S. state of Massachusetts. It opened on April 11, 1936, with a large network operating for the next quarter-century. Measured by fleet size, the Boston-area system was the second-largest trolleybus system in the United States at its peak, with only the Chicago system having more trolleybuses than Boston's 463. After 1963, the only remaining portion was a four-route cluster operating from the Harvard bus tunnel at Harvard station, running through Cambridge, Belmont, and Watertown. The Massachusetts Bay Transportation Authority took over the routes in 1964.
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.
Fields Corner station is a rapid transit station on the Ashmont branch of the Massachusetts Bay Transportation Authority (MBTA) Red Line, located in the Fields Corner district of Dorchester, Boston, Massachusetts. It is a major transfer point for MBTA bus service, serving routes 15, 17, 18, 19, 201, 202, and 210. The station opened in 1927 and was completely rebuilt from 2004 to 2008, making it fully accessible.
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.
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.
The Washington Street Elevated was an elevated segment of Boston's Massachusetts Bay Transportation Authority subway system, comprising the southern stretch of the Orange Line. It ran from Chinatown through the South End and Roxbury, ending in Forest Hills in Jamaica Plain, Boston.
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.
Wood Island station is an MBTA Blue Line rapid transit station located off Bennington Street in the Day Square section of East Boston, Boston, Massachusetts. The station is adjacent to and named for the former Wood Island Park, a once heavily used recreational area for East Boston residents. Most of the park was destroyed in the mid 1960s to expand Logan International Airport. It was built in 1952, replacing a pair of Boston, Revere Beach and Lynn Railroad stations that served the area.
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.
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.
South Station is a transfer station on the MBTA rapid transit Red Line and bus rapid transit Silver Line, located at Summer Street and Atlantic Avenue in downtown Boston, Massachusetts. It is a part of the South Station complex, the second busiest transportation center in New England. Eight MBTA Commuter Rail and three Amtrak intercity rail services terminate at South Station; many of those passengers then transfer to the rapid transit lines to reach other destinations in the city. With 24,639 daily boardings in 2019, South Station is the busiest station on the MBTA rapid transit system.
MBTA bus: CT3, 10, 16, 17, 18, 171 
