Fairmount Line
| Company type | Commuter rail line |
|---|---|
| Industry | Public transportation |
| Founded | 1855 |
| Headquarters | Boston, Massachusetts , United States |
Area served | Boston neighborhoods including Dorchester, Mattapan, Hyde Park, and Milton |
| Products | Commuter rail service |
| Website | www |
The Fairmount Line, also known as the Dorchester Branch, is part of the MBTA Commuter Rail network serving Boston, Massachusetts, USA. It extends southwest from South Station, traversing Boston neighborhoods such as Dorchester, Mattapan, and Hyde Park, with a brief stretch passing through Milton. Weekend operations commenced on November 29, 2014. The majority of trains terminate and reverse direction at Readville, although certain services on the Franklin/Foxboro Line utilize the Fairmount Line as an alternative to the Northeast Corridor.
From the 1980s until 2012, the line included five stations: the two endpoints at South Station and Readville plus three intermediate stops. Between 2012 and 2013, three additional stations were inaugurated: Talbot Avenue opened on November 12, 2012, followed by Newmarket and Four Corners/Geneva on July 1, 2013. The introduction of the Blue Hill Avenue station was delayed due to local opposition regarding its design and placement, ultimately opening on February 25, 2019. Accessibility features have been incorporated at all stations.
The route primarily caters to low-income and working-class populations. Despite frequent service disruptions, daily ridership surged from 789 in 2012 to 2,652 by 2018, reaching 2,843 in October 2022. Although it remains among the MBTA Commuter Rail's less frequented lines, this increase signifies growing demand within its service corridor.
Previous operations
Originally built in 1855 to provide a Boston entry point for the Norfolk County Railroad and its successors, this line replaced dependence on a connection through the Boston and Providence Railroad (B&P) originating from Dedham. The route branched off at Islington, crossed the B&P tracks at Readville, passed through neighborhoods including Hyde Park and Dorchester, intersected with the Old Colony Railroad at South Bay Junction, then curved westward toward downtown Boston where it terminated at Dewey Square.
Following several reorganizations, it became part of the New York and New England Railroad (NY&NE) in 1873 and later integrated into the New England Railroad in 1895. In 1898, it was leased to the New York, New Haven and Hartford Railroad (NYNH&H) as their Midland Division. Operationally divided at Readville, many trains transferred between the Midland Branch and B&P lines.
With South Station opening in 1899, new track alignments were constructed for the Midland Branch west of the Old Colony mainline. Consequently, the former South Boston terminal was abandoned; its passenger services ceased while remaining tracks were repurposed exclusively for freight. South Boston continued to be served by a station positioned between Old Colony and Midland lines.
Under NYNH&H management, most intercity routes and select commuter trains from the former NY&NE (now operating as the Franklin/Foxboro Line) switched onto the Northeast Corridor mainline at Readville; meanwhile, Midland Branch operations concentrated on local service. Passenger trains north of Readville were discontinued in 1944 due to declining usage; however, freight operations to South Boston persisted.
Resumption of passenger operations
In 1973, the MBTA took ownership of the Franklin Line tracks south of Readville from Penn Central, followed by the acquisition of the Midland line from Readville to Southampton Street in 1976. To facilitate a bypass during the Southwest Corridor project, a modernization contract worth $3.7 million was awarded. Stations at , , and were reconstructed with simple platforms and commenced service for local commuters. On November 3, 1979, trains on the Franklin and Providence/Stoughton Line routes, along with Amtrak intercity trains, were redirected to travel via the Midland line. Although initially intended as a temporary measure, this service restoration quickly gained favor among local riders. However, in January 1981, Uphams Corner and Morton Street stations were closed due to system-wide budget reductions.
Following the reopening of the Southwest Corridor on October 5, 1987, the majority of Franklin and Attleboro/Stoughton Line trains resumed routing through it. In response to community advocacy, the MBTA introduced the Fairmount Shuttle (later renamed the Fairmount Line), operating between South Station and Fairmount on the former Midland tracks; this included refurbishments and reopening of Morton Street and Uphams Corner stations. By November 30, 1987, service was extended to Readville. Also referred to as the Dorchester Branch, certain peak-hour Franklin/Foxboro Line trains utilize this route to alleviate congestion on the Southwest Corridor. A 2010 MBTA study recommended extending select Fairmount trips to Foxboro using parts of the Franklin Line to provide consistent Foxboro service.
Until roughly 2004, some Providence/Stoughton trains ran over Fairmount tracks before being rerouted to avoid passing through CSX's Readville yard. During disruptions on the Northeast Corridor north of Readville, Franklin and Providence lines are occasionally diverted via the Fairmount Line.
By the 1920s, all grade crossings had been removed except for Bird Street in Dorchester. After prolonged discussions, plans to replace this crossing with a road bridge were abandoned in 1941 due to steel shortages during wartime. The crossing was closed in the late 1970s prior to passenger service resumption; a pedestrian footbridge replaced it but fell into disrepair because of neglect and vandalism. Despite community efforts beginning in 2010 to address this issue, action was delayed until March 2014 when safety concerns led to closure by the MBTA. Disputes regarding responsibility between Boston city officials and the MBTA postponed replacement efforts; ultimately, the bridge was demolished around 2018 without a successor structure.
Enhancement initiative
In 2005, Massachusetts committed to upgrading the Fairmount Line as part of federally mandated measures under its legally binding obligations to reduce air pollution linked to the Big Dig. These improvements were stipulated by the State Implementation Plan in coordination with the federal United States Environmental Protection Agency, with a completion deadline set for December 31, 2011. An interim milestone required finalizing design, securing permits, passing legislation, and acquiring land by December 1, 2009.
The project involved reconstructing existing stations at Uphams Corner and Morton Street to include high-level platforms, canopies, ramps, electronic signage, and pedestrian access paths. All stations were upgraded for compliance with the Americans with Disabilities Act, ensuring full wheelchair accessibility. Four additional stations were established at Four Corners/Geneva, Talbot Avenue, Blue Hill Avenue, and Newmarket. Infrastructure improvements encompassed rebuilding six bridges, installing a new interlocking system, and modernizing signals.
Funding for this initiative comprised $37 million from the MBTA supplemented by $39 million allocated through Massachusetts’ 2007 Emergency Needs Bond Bill. The total projected cost reached $79.4 million. These enhancements are estimated to shift approximately 220 daily automobile trips onto transit options and boost weekday ridership from around 2,800 to about 7,300 one-way trips. A $22.9 million bridge reconstruction project commenced in January 2007.
The MBTA’s approach drew inspiration from the community-led Indigo Line proposal aimed at transforming service characteristics toward rapid transit standards—featuring increased frequency and additional stops. Nevertheless, initial MBTA plans did not incorporate higher service frequency or pre-paid fare systems. The Indigo Line’s suggestion to employ diesel multiple unit (DMU) trains was considered but postponed due to funding constraints; although a 2014 budget proposed DMU acquisitions with deliveries starting in 2018, this plan was canceled in 2016.
Talbot Avenue station opened on November 12, 2012; Newmarket and Four Corners/Geneva stations followed on July 1, 2013. Alongside these openings, five new round trips were introduced, and Fairmount station was temporarily designated as fare zone 1A to align fares with rapid transit levels. Ribbon-cutting events took place on July 17, 2013.
The Blue Hill Avenue station project encountered controversy over its location and design choices; some community members expressed concern about insufficient public engagement prior to MBTA decisions. Construction was initially scheduled for late 2015 with an anticipated opening in June 2017 but experienced delays. Announced in October 2014, work resumed aiming for completion by December 2017; weekend service also restarted that November—the first since its suspension in 1979. By October 2016, bids were solicited for construction planned during 2017 with an expected opening in 2019. Groundbreaking occurred on June 3, 2017; weekend train services were reduced with shuttle bus substitutions during construction periods. Blue Hill Avenue station officially opened on February 25, 2019.
Weekend operations were suspended again in late 2017 to allow installation of federally mandated Positive Train Control systems ahead of a required deadline in 2020. Bridge reconstruction projects at Norfolk Avenue and East Cottage Street took place throughout the early 2020s.
2020–21 pilots and COVID-19 pandemic
A 2010 analysis explored the possibility of extending Fairmount Line trains to Foxboro station for routine commuter operations. In August 2017, the MBTA Fiscal Control Board authorized an 11-month pilot program to evaluate this service, initially slated to commence in late 2018 or early 2019. Service to Foxboro, achieved through extended Fairmount Line trains and rerouted Franklin Line trains, officially started on October 21, 2019. Some community members expressed concerns that the extension might degrade service quality at existing Fairmount Line stops, while others anticipated potential improvements through increased service frequency.
In January 2020, the MBTA Fiscal Management and Control Board approved a one-year pilot introducing four additional weekday round trips on the Fairmount Line, raising total weekday round trips to 24. The rollout was postponed due to the COVID-19 pandemic and eventually launched on June 22, 2020. Stations were equipped with CharlieCard readers to facilitate proof-of-payment transfers to subway and bus systems. On November 2, 2020, one more round trip was added, establishing 45-minute intervals; however, Foxboro service was suspended at that time with intentions to restart in Spring 2021, which did not materialize. From December 14, 2020, through April 5, 2021, weekday frequencies were temporarily reduced to hourly intervals because of systemwide service reductions.
By February 2022, weekday operations included approximately 23½ round trips, with weekend service offering 12 round trips. Beginning May 23, 2022, bicycles were permitted on all Fairmount Line trains. The expanded pilot—featuring free transfers and CharlieCard payment options—was formalized as a permanent service enhancement. Limited Foxboro service resumed via Ruggles station rather than the Fairmount Line itself. By October 2022, daily ridership reached 2,843 passengers (107% of pre-pandemic levels from 2018), surpassing the overall system average recovery rate of 69%. Ridership further increased to 130% of pre-COVID figures by May 2023—the highest recorded since MBTA assumed operations.
Prior to May 2023, intermediate stations operated as flag stops outside of weekday peak hours; effective May 22, they transitioned to scheduled stops throughout all service times. On October 2, 2023, the final evening train bound for Stoughton began running via the Fairmount Line—the first such evening service since 2004. Service frequency was enhanced to every 30 minutes (including weekends) starting May 20, 2024, with some midday trips terminating at Fairmount station. Concurrently, all weekend Franklin/Foxboro Line trains started running over the Fairmount Line.
Electrification
After the Indigo Line proposal was canceled in 2016, transit advocates and legislators intensified efforts advocating for comprehensive electrification of the Fairmount Line. In June 2022, MBTA revealed plans to transition the line to electric operation by 2028–29 utilizing battery electric multiple units (BEMUs), thereby avoiding catenary infrastructure installation by enabling charging at Readville.
In December 2023, Keolis, operator of MBTA Commuter Rail services, solicited proposals for acquiring BEMUs and implementing a target headway of twenty minutes on the Fairmount Line by 2027 as part of contract renewal negotiations; a due diligence notification followed in March 2024. The MBTA board approved a $54 million proposal in July 2024 aiming for early-2028 commencement of electric service. Under this contract, Keolis will construct a light maintenance facility dedicated to BEMU operations.
By November 2024, Keolis intended to issue requests for proposals (RFPs) concerning rolling stock procurement and financing arrangements; the rolling stock RFP was released in February 2025.
To accommodate new equipment integration, midday and weekend services were scaled back starting June 2, 2025, facilitating comprehensive track replacement work. This $12 million infrastructure upgrade is anticipated to conclude by fall of that year.
Active stations
| Fare zone | Distance (mi/km) | Station name | Connections and remarks | ||
|---|---|---|---|---|---|
| 1A | 0.0 (0.0) | Disabled access
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| 2.0 (3.2) | Disabled access
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| 2.4 (3.9) | Disabled access
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| 3.4 (5.5) | Disabled access
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| 4.5 (7.2) | Disabled access
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| 5.3 miles (8.5 km) | Disabled access
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| 6.0 miles (9.7 km) | Disabled access
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| 7.9 miles (12.7 km) | Disabled access
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| 2 | 9.2 miles (14.8 km) | Disabled access
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Stations, past and present