An outbound train leaving Longwood station in 2022
Overview
Locale
Boston, Brookline, Cambridge, Newton, and Somerville, Massachusetts
Termini
Union Square
Riverside
Stations
25
Service
Type
Light rail
System
Green Line (MBTA subway)
Daily ridership
24,632 (surface boardings, 2011)[1]
History
Opened
July 4, 1959[2]
Technical
Character
Grade-separated, partially underground
Track gauge
4 ft 8+1⁄2 in (1,435 mm)
Electrification
600 V DC overhead
Route map
Legend
E branch
Union Square
Green Line Extension
Lechmere
Lechmere Viaduct
over Charles River
Science Park
Orange Line
North Station
Haymarket
Orange Line
Government Center
Park Street
Boylston
Arlington
Copley
Copley Junction
E branch
Hynes Convention Center
Kenmore
B branch
C branch
Fenway incline
Fenway
Longwood
Brookline Village
Brookline Hills
Beaconsfield
C branch
Cleveland Circle
Reservoir
Chestnut Hill
Newton Centre
Newton Highlands
Eliot
Waban
Woodland
Riverside
Riverside Yard
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The Green Line D branch (also referred to as the Highland branch or Riverside Line) is a light rail line in Boston, Brookline, Cambridge, Newton, and Somerville, Massachusetts, operating as part of the Massachusetts Bay Transportation Authority (MBTA) Green Line. The line runs on a grade separated surface right-of-way for 9 miles (14 km) from Riverside station to Fenway station. The line merges into the C branch tunnel west of Kenmore, then follows the Boylston Street subway and Tremont Street subway to North Station. It is the longest and busiest of the four Green Line branches. As of February 2023[update], service operates on 8 to 9-minute headways at weekday peak hours and 8 to 11-minute headways at other times, using 13 to 19 trains (26 to 38 light rail vehicles).[3]
Unlike the other three Green Line branches, the D branch did not originate as a streetcar line running on city streets. The Boston and Albany Railroad Highland branch, built in segments from 1848 to 1886, operated as a commuter rail line until its 1958 closure. It was converted to a streetcar rapid transit line by the Metropolitan Transportation Authority and reopened on July 4, 1959. Ownership passed to the MBTA in 1964; Tremont Street subway service was designated as the Green Line in 1965, with the Riverside Line becoming the D branch in 1967.
The line was substantially rebuilt in the mid-1970s, in 2007, and in 2018–2020. The downtown terminal was shifted between Park Street, Government Center, North Station, and Lechmere a number of times; it was extended to Union Square in September 2022 as part of the Green Line Extension project. Nine of the line's thirteen surface stations have been rebuilt for accessibility; the remaining four are scheduled for rebuilding beginning in 2024.
^"Ridership and Service Statistics" (PDF) (14th ed.). Massachusetts Bay Transportation Authority. 2014.
^Belcher, Jonathan. "Changes to Transit Service in the MBTA district" (PDF). Boston Street Railway Association.
^Belcher, Jonathan (January–February 2023). "MBTA Vehicle Inventory as of February 28, 2023". Rollsign. Vol. 59, no. 1–2. Boston Street Railway Association. p. 10.
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