Orange Line (MBTA)

Massachusetts Bay Transportation Authority
Company type	Public agency
Industry	Public transportation
Founded	1964
Headquarters	Boston, Massachusetts, United States
Area served	Greater Boston, Massachusetts
Products	Rapid transit, bus, commuter rail services
Website	www.mbta.com

The Orange Line is a rapid transit service managed by the Massachusetts Bay Transportation Authority (MBTA) as part of the MBTA subway network. It stretches from Oak Grove station in Malden, Massachusetts heading southward through Malden and Medford, Massachusetts, crosses the Mystic River into Somerville, Massachusetts, continues through Charlestown, Boston, passes beneath the Charles River, and traverses Downtown Boston via the Washington Street Tunnel. Emerging in the South End, the line follows the Southwest Corridor southwest through Roxbury and Jamaica Plain before reaching Forest Hills station.

Operating with six-car trains during regular MBTA hours, the Orange Line utilizes a fleet of 152 cars manufactured by CRRC between 2018 and 2024. The entire route is grade-separated, featuring operator-controlled trains equipped with automatic train control systems to ensure safety. Maintenance and storage facilities are located at Wellington Carhouse in Medford, with an additional smaller yard at Forest Hills. Accessibility is provided at all 20 stations along the line. As of 2023, it carries an average of 105,000 weekday riders, making it the second most heavily used line within the MBTA subway system.

The line traces its origins to the Main Line Elevated of the Boston Elevated Railway, which began operations in 1901. This early system incorporated the Charlestown Elevated, Atlantic Avenue Elevated, Washington Street Elevated, and a segment of the Tremont Street subway. In 1908, the Washington Street Tunnel opened to replace part of the Tremont Street subway; subsequent expansions extended service to Forest Hills by 1909 and reached Everett by 1919. The Atlantic Avenue Elevated was discontinued in 1938.

In 1965, MBTA introduced a color-coded scheme for its subway routes, assigning this corridor as the Orange Line. The Charlestown Elevated ceased operations in 1975 and was supplanted by the Haymarket North Extension completed in 1977. The Southwest Corridor replaced the Washington Street Elevated in 1987 along a former Interstate 95 right-of-way, establishing the current alignment. During the 1980s, downtown stations were lengthened to accommodate six-car trains; accessibility improvements began during this period and were finalized by 2005. The Assembly station was added as an infill stop in 2014.

Throughout the 2010s and early 2020s, aging infrastructure and outdated rolling stock caused reliability issues on the line. Despite efforts to modernize the fleet, several disruptions occurred in 2022. In response, extensive repairs were accelerated system-wide from August to September 2022 and have continued on various sections into 2024.

Construction

The electric Boston Elevated Railway’s Main Line commenced operation incrementally starting in 1901. It ran from Sullivan Square via the Charlestown Elevated to the Canal Street incline near North Station. From there, it proceeded underground through the Tremont Street subway (currently part of the Green Line) before emerging at the now-defunct Pleasant Street incline close to Boylston station. A temporary connection linked this segment to the Washington Street Elevated, which extended from that point southward to Dudley Square—largely corresponding to today’s initial phase of the Silver Line.

Also inaugurated in 1901 was the Atlantic Avenue Elevated, branching off at Causeway Street to offer an alternative downtown route along Boston’s waterfront—a corridor where rail transit no longer operates today.

The Washington Street Tunnel opened in 1908, allowing Main Line trains from the Charlestown Elevated to travel underground via a new portal at the Canal Street incline, beneath downtown Boston. This tunnel reconnected with both Washington Street and Atlantic Avenue Elevated lines near Chinatown. Stations along this route were adorned with elaborate tile work, mosaics, and copper detailing; entryways were modestly designed and integrated into surrounding structures following criticism of earlier architectural styles. Meanwhile, streetcars resumed exclusive use of the parallel Tremont Street subway.

By 1909, service on the Washington Street Elevated had extended southward to . Trains passing through the new tunnel either continued northward to Sullivan Square or turned back via the Atlantic Avenue Elevated loop.

In 1919, coinciding with partial damage sustained by the Atlantic Avenue Elevated during Boston’s infamous Great Molasses Flood, an extension of the Charlestown Elevated pushed north from Sullivan Square to reach Everett station, crossing over the Mystic River on a drawbridge. While long-range plans envisioned further expansion northward to Malden, this objective was ultimately achieved decades later under MBTA public ownership rather than through Everett.

Closure of Atlantic Avenue Elevated and changes in ownership

After an accident occurred on Beach Street in 1928, the southern stretch of the Atlantic Avenue Elevated—specifically the segment between South Station and Tower D on Washington Street—was shut down, except for rush-hour service running from Dudley to North Station, effectively breaking the original loop. During off-peak hours, service was limited to a shuttle operating solely between North and South Stations. By 1938, the remainder of this line ceased operations, leaving only the downtown subway route active, which corresponds today to the Orange Line connecting and stations.

In 1947, control of the transit system shifted from the private Boston Elevated Railway to the publicly owned Metropolitan Transit Authority (MTA), which later evolved into the current Massachusetts Bay Transportation Authority (MBTA) in 1964.

On December 5, 1960, the MTA implemented a "modified express service" during morning peak hours where alternate trains would skip stops at Green Street, Egleston (southbound), Northampton (northbound), Dover, and Thompson Square stations. This arrangement was discontinued in September 1961 to decrease wait times at these fully outdoor stations.

Designation as Orange Line

Initially known as the Main Line Elevated under Boston Elevated Railway management and subsequently as the Forest Hills–Everett Elevated (Route 2 on transit maps) under the Metropolitan Transportation Authority, the line was renamed by the MBTA after assuming operational control in August 1964.

On August 26, 1965, as part of a system-wide modernization led by Cambridge Seven Associates, Boston’s rail lines were assigned distinct colors. Designer Peter Chermayeff selected red for the line serving Harvard, blue for the coastal North Shore route, and green for the line traversing Olmsted’s Emerald Necklace. The Main Line Elevated received orange "primarily for color balance," with no specific rationale. Although yellow was initially considered, it was rejected due to poor visibility against white backgrounds; yellow was later designated for MBTA bus services. Additionally, both MBTA sources and transit historians associate the orange designation with Orange Street—the former name of part of Washington Street.

In early 1967, four stations within the Washington Street Tunnel were renamed to improve clarity and consistency: transfer stations aligned their names across lines—Winter and Summer along with Washington on the Red Line consolidated into Washington; Milk and State with Devonshire on the Blue Line combined as ; Union and Friend plus Haymarket Square on the Green Line unified as . To avoid confusion with nearby Boylston station on the Green Line, Boylston Street was renamed Essex.

Additional renaming took place in May 1987 when Essex became , reflecting its adjacent neighborhood, and Washington was renamed , after a nearby retail district. In March 2010, New England Medical Center station adopted the name , coinciding with the hospital’s rebranding.

Rerouting of Charlestown and Everett service

The Boston Transportation Planning Review during the 1970s proposed extending the Orange Line to Route 128, with northern terminus at Reading and southern terminus at Dedham. As part of these plans, the Charlestown Elevated—which served Charlestown and Everett—was dismantled in 1975.

The Haymarket North Extension redirected Orange Line trains through an underwater tunnel beneath the Charles River. Service to Charlestown was rerouted onto Boston and Maine Railroad tracks running under an elevated section of Interstate 93, terminating first at station and later extending to in Malden; this new alignment bypassed Everett entirely. Consequently, rail service to Everett was replaced by bus transit.

This extension featured a distinctive third express track between Wellington and Community College stations intended for a planned but never realized extension northward to Reading. This express track facilitated peak-direction express trains and allowed for train turnbacks. Due to opposition from Melrose residents who preferred restoring commuter rail service, this express track ends at Wellington station; beyond that point, a single commuter rail track continues parallel toward Reading. Stations such as Sullivan Sq, Wellington, and Community College are equipped with two island platforms—a design that contrasts with most southern Orange Line stations.

Shutdown of Washington Street Elevated

Following community opposition that stopped the Interstate 95 extension into downtown Boston in 1972, the previously cleared Southwest Corridor area was repurposed for transit use. Rather than constructing an eight-lane freeway featuring a median Orange Line similar to Chicago's Dan Ryan branch, the corridor was redesigned to accommodate the relocated Orange Line, a three-track mainline serving both Amtrak’s Northeast Corridor and MBTA Commuter Rail, alongside a linear park. This realignment was finalized in 1987, resulting in the dismantling of the Washington Street Elevated—the final significant portion of the original elevated structure.

From April 30 to May 3, 1987, the segment of the Washington Street Elevated south of was closed to facilitate connecting the Orange Line to the Southwest Corridor. On May 4, 1987, the Orange Line was rerouted westward along the Massachusetts Turnpike, utilizing the former Boston and Albany Railroad right-of-way to , then proceeding along newly constructed partially covered and below-grade tracks to . This corridor is shared with Amtrak’s Northeast Corridor intercity trains.

Although Forest Hills remained as the line’s terminus, this new alignment shifted considerably westward from Washington Street; residents were assured they would receive "equal or better" transit service. Early proposals envisioned light rail vehicles operating mixed-traffic routes from Washington Street to Dudley Square and then southeast toward Dorchester. In 2002, Phase 1 of the Silver Line bus rapid transit system launched to link Washington Street with downtown subway lines, partially addressing transit demands despite some community resistance favoring rail restoration.

Station Upgrades

During the mid-1980s, the MBTA allocated $80 million to lengthen platforms at seven Red Line stations and three Orange Line stations (, Washington, and ) to support six-car train operations. Full accessibility was achieved at Washington and State stations as well as on Essex’s northbound platform. The Southwest Corridor stations, inaugurated in 1987, were constructed with complete accessibility features. Six-car train service commenced on August 18, 1987. Around this period, also underwent renovation.

By 1990, only , five stations on the Haymarket North Extension, and Chinatown’s southbound platform remained non-accessible under ADA guidelines. Construction projects began at and in 1991. Elevators were installed at by 2000. The station built in 1975 was expanded into a "superstation" enabling cross-platform transfers with the Green Line; elevators were added in 2001 although Green Line service did not start until 2004. Chinatown’s southbound platform became accessible in 2002. Renovations completed at and by 2005 made the Orange Line the first original MBTA subway line to achieve full accessibility compliance.

Assembly Station Development

In the early 2000s, Somerville proposed adding an infill station between and to serve the Assembly Square neighborhood redevelopment. The $57 million project received funding from the state’s Executive Office of Housing and Economic Development, the Federal Transit Administration’s Section 5309 New Starts program, and Federal Realty Investment Trust (the developer of Assembly Square). Construction commenced in late 2011 and concluded by mid-2014. The newly constructed station, , opened on September 2, 2014, representing the MBTA’s first new subway station since 1987.

Reliability challenges and maintenance efforts

The MBTA system faced several service interruptions during the severe winter of 2014–2015, largely due to heavy snow accumulation. Ice formed on the exposed third rails of the Orange and Red lines, leading to power disruptions and halts in train movement; with trains unable to operate and clear the tracks, snow buildup rendered the lines unusable. The Blue Line was not affected by this problem because its surface segments use overhead power lines rather than third rails.

In response, the MBTA initiated an $83.7 million Winter Resiliency Program in 2015, focusing on mitigating these issues, particularly along the Orange Line’s exposed stretches north of Sullivan Square. Enhancements included installing heated third rails, switch heaters, and snow fences designed to improve performance during adverse weather. These improvements necessitated bus replacements during select nights and weekends.

By October 2018, the MBTA awarded a $218 million contract to modernize signaling systems on both the Red and Orange Lines, targeting a 4.5-minute interval between trains on the Orange Line by 2022.

On July 22, 2022, an Orange Line train experienced a fire while crossing the Mystic River caused by a loose metal sill making contact with the third rail; all passengers evacuated safely without injury.

Due to persistent reliability concerns, the MBTA temporarily suspended all Orange Line service from August 19 to September 18, 2022. This closure accelerated repairs on track infrastructure, ties, signals, concrete walls, and allowed for installation of new crossovers. The shutdown also facilitated the introduction of new CRRC train cars and aimed to lift speed restrictions while enhancing overall safety. Despite reopening, some slow zones remained in place, resulting in longer travel times compared to pre-closure levels. Additional maintenance work was scheduled through late 2022 to resolve these ongoing issues.

In November 2023, MBTA General Manager Phillip Eng unveiled a strategy to eliminate all 191 subway slow zones by the close of 2024. This plan involved multiple brief shutdowns of Orange Line segments starting in March 2024 to expedite track improvements. By early November 2024, all speed restrictions on the Orange Line were lifted for the first time in nearly fifteen years. As of January 2025, plans include raising maximum speeds north of Assembly station up to 55 mph.

Former route configurations

1901–1908	1908–1938
Template:MBTA Orange Line 1901-1908	Template:MBTA Orange Line 1908-1938
1938–1975	1975–1987
Template:MBTA Orange Line 1938-1975	Template:MBTA Orange Line 1975-1987
1987–present	Notes
Template:MBTA Orange Line 1987-present	Haymarket and State stations received their current names in 1967. Downtown Crossing and Chinatown underwent renaming in both 1967 and again in 1987. New England Medical Center was renamed Tufts Medical Center in 2010.

Station listing

Location

Station

Opened

Notes and connections

Malden