MBTA Green Line

MBTA Green Line. The Green Line is a light rail system operated by the Massachusetts Bay Transportation Authority (MBTA) in the Greater Boston area. As the oldest subway line in the United States, its core section through Tremont Street opened in 1897. The line currently operates four primary branches—B, C, D, and E—along with newer extensions to Union Square and Medford/Tufts, serving key areas like Boston University, Fenway–Kenmore, and Somerville.

History

The line's origins trace to the 1856 establishment of the Metropolitan Railroad and later the West End Street Railway, which pioneered electric streetcar operations. The groundbreaking Tremont Street subway, engineered by Howard A. Carson, opened to great fanfare, relieving congestion in Scollay Square and Boston Common. Over subsequent decades, the system expanded under the Boston Elevated Railway and later the Metropolitan Transit Authority, converting former Boston and Albany Railroad and New York Central Railroad routes into the Highland branch and Riverside branch. Major projects like the 1912 Boylston Street extension and the 1932 Kenmore portal facilitated growth, while the 1959 creation of the Massachusetts Bay Transportation Authority unified operations. The Green Line Extension project, approved after decades of advocacy and legal agreements stemming from the Big Dig, began opening new stations in Somerville and Medford in 2022.

Service

The Green Line operates as a high-frequency light rail service with four main branches converging in the central subway. The B branch terminates at Boston College, serving Boston University and Allston. The C branch ends at Cleveland Circle, running through Brookline along the Beacon Street corridor. The D branch travels to Riverside on the former Boston and Albany Railroad right-of-way, passing through Newton. The E branch terminates at Heath Street, with some peak service historically extending to Arborway. The new Medford/Tufts and Union Square branches operate as part of the Green Line Extension, managed from a new vehicle facility at Boston Landing. Key transfer points include North Station for Commuter Rail and Orange Line, and Government Center for the Blue Line.

Rolling stock

The fleet consists of three generations of articulated light rail vehicles. The Kinki Sharyo Type 7 cars, built in the late 1980s, feature a boxy design and were assembled in Hiroshima. The low-floor AnsaldoBreda Type 8 cars, introduced in the early 2000s, improved accessibility but faced initial reliability issues. The newest CRRC Type 9 vehicles, built by CRRC at its Springfield facility, entered service in the 2020s with increased capacity and modern amenities. All maintenance is performed at the Riverside Carhouse and the new Vehicle Maintenance Facility in Somerville. The PCC streetcar, once the workhorse of the system, last operated in regular service on the Ashmont–Mattapan High Speed Line.

Stations

The line serves 70 stations with diverse architectural styles and configurations. Major underground stations include the historic Park Street, designed by Alexander Wadsworth Longfellow Jr., and the renovated Government Center, which reopened in 2016. Key surface stops include the busy Kenmore plaza and the iconic Fenway near Fenway Park. The Green Line Extension added six modern stations, such as Union Square and Medford/Tufts, designed by firms like Sasaki Associates and built by GLX Constructors, a joint venture of Fluor and The Middlesex Corporation. Notable station art includes installations at Science Park and the Lechmere replacement.

Future plans

Planned expansions focus on completing the Green Line Extension by building the Medford Branch to Route 16. Other long-term proposals include restoring Arborway service on the E branch and studying potential new branches to West Station in Allston and Charles River Circle. The MBTA is also pursuing modernization projects like new signal systems under the Green Line Transformation program and station accessibility upgrades across the network. Fleet plans involve the eventual retirement of the Kinki Sharyo Type 7 cars and further procurement of CRRC Type 9 vehicles to support expanded service on the Somerville corridor. Category:MBTA Green Line Category:Light rail in Massachusetts Category:Railway lines opened in 1897 Category:Transportation in Boston