MBCR

The MBTA Commuter Rail system serves as the commuter rail arm of the Massachusetts Bay Transportation Authority's (MBTA's) transportation coverage of Greater Boston in the United States. Trains run over of track on 12 lines to 142 stations. It is operated under contract by Keolis.

In , the system had a ridership of , or about per weekday as of , making it the fifth-busiest commuter rail system in the U.S., behind the three New York-area systems and the Chicago-area system. The line's characteristic purple-trimmed coaches operate as far south as North Kingstown, Rhode Island, and as far north as Newburyport and as far west as Fitchburg, both in Massachusetts.

Trains originate at two major terminals in Boston – South Station and North Station. The only connection between the two halves of the system is the non-revenue Grand Junction Branch. The North–South Rail Link is a proposed tunnel between North Station and South Station to allow through-running service.

Service

Lines

The system consists of twelve lines – four of which have branches – radiating from downtown Boston. Eight "southside" lines terminate at South Station, with four (Framingham/Worcester, Needham, Franklin/Foxboro, and Providence/Stoughton) also running through Back Bay station. Four "northside" lines terminate at North Station. The lines vary in length from the Fairmount Line to the Providence/Stoughton Line, with typical lengths in the range. The system has of revenue trackage and covers roughly the eastern third of Massachusetts plus central Rhode Island.

Most lines do not share trackage outside the Boston terminal areas, with several exceptions. The Providence/Stoughton Line and Franklin/Foxboro Line both use the Northeast Corridor between and South Station, with the Needham Line also sharing the tracks between and South Station. The Fall River/New Bedford Line, Kingston Line, and Greenbush Line all use the Old Colony mainline between South Station and Braintree. The Haverhill Line and Newburyport/Rockport Line share tracks between North Station and near . A small number of Haverhill Line trains use the inner Lowell Line and the Wildcat Branch, while some Franklin/Foxboro Line trains (including all weekend trains) use the Fairmount Line rather than the Northeast Corridor. Several Amtrak intercity routes run on MBTA tracks: the and over the Providence/Stoughton Line, the over the Framingham/Worcester Line, and the over portions of the Lowell and Haverhill lines. Private companies also operate freight service over much of the system (see ).

Stations

, there are 142 active stations – 55 northside and 87 southside. One other station, , is temporarily closed due to reconstruction of an adjacent bridge. Five additional stations (, , , , and ) are indefinitely closed due to service cuts during the COVID-19 pandemic. Several other stations are planned. South Station, North Station, and Back Bay all have MBTA subway and Amtrak connections; nine other stations have subway connections, and six others have Amtrak connections.

Stations range in size from small platforms like to the sprawling downtown terminals. Most stations outside downtown Boston have one or two side platforms or a single island platform. Standard MBTA platforms are about long – enough for a nine-car train – and a minimum of wide for side platforms and wide for island platforms. 119 active stations are accessible, including all terminals and all stations with rapid transit connections; 23 are not. The MBTA uses -high platforms for accessible level boarding, as is standard in the northeastern United States. Some accessible stations have full-length high platforms for accessible boarding on all cars; others only have "mini-high" platforms about long – which allow for level boarding on two cars – with the rest of the platform length not accessible.

Operations

The MBTA Commuter Rail system is operated by Keolis Commuter Services – a subsidiary of French company Keolis – under contract to the MBTA. The MBTA owns all passenger equipment and most stations. Most trackage is also owned by the MBTA. The Massachusetts Department of Transportation (parent agency of the MBTA) owns several portions of the Framingham/Worcester Line as well as the Grand Junction Branch, which is used for non-revenue equipment moves between the northside and southside lines. Pan Am Southern owns the section of the Fitchburg Line between and Wachusett, while Amtrak owns the section of the Northeast Corridor (used by the Providence/Stoughton Line) in Rhode Island.

Most lines operate on regular headways, though some have additional service at peak hours. Service levels vary by lines: the Greenbush and Kingston lines have 13 round trips on weekdays, while the Providence/Stoughton Line has 37. Running times vary from 30 minutes on the Fairmount Line to nearly 120 minutes for some Providence/Stoughton Line trips, with 60–75 minutes typical. Most trains stop at all stations on the line; some stations have limited service, and peak-hour express trains operate on several lines. Several lines additionally have some short turn service. The CapeFlyer, a seasonal weekend-only service to Cape Cod, operates using MBTA equipment over the Middleborough/Lakeville Line plus the Cape Main Line (which is not otherwise used by the MBTA). Special express service to Foxboro station is operated during New England Patriots home games and some other events at Gillette Stadium. It runs from South Station via the Franklin/Foxboro Line, and from Providence via the Providence/Stoughton Line. During the winter, one "ski train" round trip of the Fitchburg Line operates with a bicycle car on weekends and Wednesday evenings, with a shuttle bus to Wachusett Mountain.

All MBTA commuter rail service is provided by push-pull trains powered by diesel locomotives (see ). Maximum speed for trains is , though some lines have lower limits. The entire system is signalled and operates with Positive Train Control using the Advanced Civil Speed Enforcement System. All lines have cab signals for automatic train control. The MBTA is a member of the Northeast Operating Rules Advisory Committee (NORAC) and uses its operating rules. Most portions of the system operate under NORAC rules 261 and 562, which allow bidirectional train movements on every track (such as an express train passing a local train in the same direction). Most lines are either double track, or single track with passing sidings; portions of the Northeast Corridor have three or four tracks.

Freight service

Freight service is operated over most of the MBTA Commuter Rail system by several private railroads. CSX Transportation operates freight on most southside lines, of which the outer portion of the Worcester Line has the most freight traffic. Massachusetts Coastal Railroad operates south of Middleborough on the Fall River/New Bedford Line. The Fore River Railroad operates between Braintree Yard and East Braintree on the Old Colony mainline and the Greenbush Line. The Providence and Worcester Railroad shares tracks with Providence/Stoughton Line trains between Providence and Wickford Junction; it uses a freight-only track between Providence and Central Falls. No freight operates on the Needham Line, the Northeast Corridor between Readville and Back Bay, the Old Colony mainline between Boston and the Greenbush Line junction in Braintree, the Kingston Line, and most of the Greenbush Line.

CSX also operates on most northside lines; prior to its 2022 purchase by CSX, Pan Am Railways operated over these lines. The Berkshire and Eastern Railroad (formerly Pan Am Southern) operates over the Fitchburg Line west of Ayer. Their combined Freight Main Line between Mechanicville, New York, and Mattawamkeag, Maine, shares tracks with sections of the Fitchburg, Lowell, and Haverhill lines. No freight service is operated over the Newburyport/Rockport Line north of .

Weight limits and loading gauge vary across the system. The full Framingham/Worcester line is rated for car weights of , sections of lines that are part of the Freight Main Line for , and other lines for lower weights. The western portion of the Framingham/Worcester Line and the southern section of the Providence/Stoughton line can accommodate cars up to ( AAR Plate H or Plate K). The Fitchburg Line west of Ayer can accommodate cars up to (AAR Plate J), while most of the other northside lines can accommodate up to (AAR Plate F). The inner Fitchburg and Newburyport/Rockport Lines, and the southside except for the outer Framingham/Worcester Line, have height restrictions smaller than Plate F.

Fares

MBTA Commuter Rail uses a zone fare system, with fares increasing with distance. Zone 1A includes the downtown terminals and other inner core stations up to about from downtown. Ten additional zones, numbered 1 through 10, extend outwards from Boston. Each zone is about 5 miles, with most outer terminals in zones 6 through 8. Only two stations use further zones: in Zone 9, and in Zone 10. Zone 1A fares are identical to MBTA subway fares (though subway passes on CharlieCards are not accepted, except for Fairmount Line stations that have CharlieCard validator machines). , one-way fares within Zone 1A are $2.40, while fares between further zones and Zone 1A range from $6.50 for Zone 1 to $13.25 for Zone 10. Trips that do not enter Zone 1A have less expensive interzone fares; , these range from $2.75 for travel within a single zone to $7.25 for travel between Zone 1 and Zone 10.

Fares can be purchased on the MBTA mTicket app, at automatic vending machines located at major stations, from businesses near some stations, or from conductors on board trains. Discounted passes include monthly passes (with or without free transfer to other MBTA services), "flex passes" valid for five 24-hour periods, and $10 passes offering unlimited travel on a single weekend. As with other MBTA services, discounted fares and passes are available for several groups including disabled passengers, passengers over age 65, and students attending certain schools. Foxboro special event services and the CapeFlyer have separate fares; regular MBTA fares and passes are not valid. Fares are collected by train conductors; while fare evasion is explicitly illegal under state law, it is not criminal. Faregates have also been installed at North Station, with plans for installation at Back Bay and South Station. The second-generation MBTA fare collection system, planned for completion in 2025, will standardize fare media across modes and allow uses of CharlieCards for all commuter rail trips.

History

Early history

Eight intercity mainlines radiating from Boston opened between 1834 and 1855: the Boston and Worcester Railroad (B&W) in 1834–35, Boston and Providence Railroad (B&P) in 1834–35, Boston and Lowell Railroad (B&L) in 1835, Eastern Railroad in 1838–1840, Fitchburg Railroad in 1843–45, Boston and Maine Railroad (B&M) in 1845, Old Colony Railroad and Fall River Railroad in 1845–46, and Norfolk County Railroad in 1849–55. Commuter rail service allowing suburban residents to work in Boston began with the B&W in 1834; by the 1860s, commuting was possible on the eight mainlines and a number of branch lines. Mergers prior to the 1880s were primarily acquisitions of branch lines and consolidations with connecting lines: the B&A merged with the Western Railroad in 1874 to become the Boston and Albany Railroad (B&A), the Fall River Railroad and several other lines merged into the Old Colony Railroad, and the Norfolk County Railroad eventually became part of the New York and New England Railroad (NY&NE). The narrow gauge Boston, Revere Beach and Lynn Railroad (BRB&L) opened in 1875, competing with the inner portion of the Eastern Railroad. Unlike the other lines, it never built rails into downtown Boston, and instead relied on a ferry connection from East Boston.

The B&M obtained control of the Eastern in 1883, the B&L in 1887, and the Fitchburg in 1900, giving it a near-monopoly on rail service north of Boston. North Union Station was built in 1893 to provide a union station for northside service; it was replaced by North Station in 1928. The Old Colony obtained control of the B&P in 1888; the New York, New Haven and Hartford Railroad acquired the Old Colony in 1893 to obtain access to Boston. The New Haven also acquired the New England Railroad (successor to the NY&NE) in 1898. South Station opened in 1899 as a union station for the southside lines (New Haven and B&A). The New York Central and Hudson River Railroad – which later became the New York Central) (NYC) – leased the B&A in 1900; this brought all Boston commuter service save the BRB&L under the control of three large multi-state railroads.

The three railroads all planned electrification of some suburban lines in the early 20th century. The New Haven tested electrification on small parts of the Old Colony system, but never followed through on its plans to electrify South Station and the inner section of the ex-B&P. Despite a study to electrify the mainline to plus the Highland branch, the NYC only electrified the short Lower Falls Branch. Quadruple-tracking and electrification of part of the ex-Eastern Railroad was planned by the B&M around 1910 when it was briefly under control of the New Haven, but this fell through when they separated. Service levels on the three major railroads peaked around 1910 and began to decline from streetcar and later auto competition in the 1910s. The independent BRB&L electrified its mainline and single branch line in 1928 and increased service to near-rapid transit levels. Two Old Colony branches were converted to an extension of Boston Elevated Railway (BERy) rapid transit in the 1920s.

Service levels declined more significantly during the 1930s; the 88 stations case resulted in the New Haven closing dozens of suburban stations and several lines in 1938. The BRB&L ceased all operations in 1940. Ridership increased during World War II but decreased soon afterwards, prompting further cuts. The railroads converted from steam to diesel in the 1950s. All three purchased substantial fleets of Budd Rail Diesel Cars, which lowered operating costs – but not enough to save most branch lines. A 1945–47 state report proposed suburban extensions of the rapid transit system, largely using railroad rights-of-way, with the expectation that most commuter rail service would be cut back to the rapid transit terminals or abandoned entirely. Prompted by the report, part of the BRB&L was reactivated as rapid transit in 1952–54 by BERy successor Metropolitan Transit Authority (MTA), and the Highland branch was converted to a rapid streetcar line in 1958–59.

Consolidation under MBTA control

The three railroads all made major cuts to suburban service in 1958–1960 as commuters began using new expressways. The B&M became unprofitable in 1958 and moved to shed its money-losing passenger operations. Four branch lines were cut that May, and most stations in the MTA service area were closed; three more branches closed in 1959. The New Haven experimentally increased Old Colony Division service for several years in the 1950s, but new management soon sought to reduce costs. Service to and was cut in 1958; a one-year state subsidy was given for the remaining Old Colony service, which ended in 1959 after the Southeast Expressway opened. The inner portion of the B&A was reduced from four to two tracks in 1959 for construction of the Massachusetts Turnpike, with several inner stations closed; all local stops west of Framingham were closed in 1960. The New Haven filed for bankruptcy for the last time in 1961. Faced with the imminent threat of losing what service remained, public opinion began to support subsidies for commuter rail.

The state Mass Transportation Commission (MTC), formed in 1959 to coordinate transportation and land use, held a series of experiments to determine how fares and service levels affected ridership. This included a trial on the MTA bus network, as well as a $4 million test from January 1963 to March 1964 on New Haven and B&M lines. (The NYC, uninterested in its commuter service, declined to participate.) The MTC found that higher frequency was most important to attract additional ridership; lower fares would attract additional riders, while even higher fares would not result in the services becoming profitable. At the recommendation of the MTC, the Massachusetts Bay Transportation Authority (MBTA) was created on August 3, 1964, with a 78-municipality funding and service district. The MBTA was to build rapid transit extensions (as planned in 1947) along some lines, with the others to be subsidized or allowed to be discontinued. Most remaining lines ran to points outside the funding district; those outlying municipalities were expected to reach their own subsidy agreements with the railroads.

On December 14, 1964, the MBTA reached a subsidy agreement with the B&M. The agreement only covered in-district services; on January 5, 1965, the B&M discontinued interstate service except for single commuter round trips from Dover and Concord, New Hampshire; Portsmouth service was cut back to a single round trip. Subsidies began for six lines on January 18; all out-of-district service to , , , , and was discontinued except for three single round trips. Agreements were reached to restore most out-of-district service; after delays due to a lawsuit by the competing Eastern Massachusetts Street Railway, full service returned to , Lowell, Ipswich, and Rockport on June 28. On June 30, 1967, the B&M discontinued the Concord trip; the Dover trip was cut back to Haverhill with local subsidies. In 1969, the B&M averaged 24,000 weekday passengers, with a yearly deficit of $3.2 million (equivalent to million in ). The single daily trip on the Central Mass Branch ended on January 26, 1971.

On July 28, 1965, the MBTA signed an agreement with the New Haven Railroad to purchase of the former Old Colony mainline from Fort Point Channel to South Braintree in order to construct a new rapid transit line along the corridor. The line was expected to be completed within two years. The agreement also provided for the MBTA to subsidize commuter service on the railroad's remaining commuter rail lines for $1.2 million (equivalent to million in ) annually. Subsidies for the Needham, Millis, Dedham, and Franklin lines began on April 24, 1966, as the New Haven had Interstate Commerce Commission (ICC) permission to discontinue them otherwise. Three out-of-district stations were cut, while Franklin subsidized its station. The Millis and Dedham lines were discontinued on April 21, 1967. The NYC and the Pennsylvania Railroad merged to form Penn Central on February 1, 1968; the New Haven joined at the end of the year. Penn Central declared bankruptcy in 1970. Amtrak took over most intercity passenger service in the US on May 1, 1971, including New York–Boston trains.

The state agreed in December 1971 to purchase of Penn Central rights of way to prevent them being sold off in bankruptcy. The MBTA purchased the lines effective January 27, 1973. They included almost all the lines with passenger service: the Attleboro Line and Stoughton Branch, Franklin Branch, Needham Branch, and the –Framingham portion of the Worcester Main Line. (The inner section of that line was already owned by the Massachusetts Turnpike Authority.) The purchase also included several freight-only or abandoned lines, including the Old Colony mainline between Braintree and Brockton. Subsidies began for the Framingham Line in January 1973, for and stations in June 1973, and all Providence/Stoughton Line service on September 28, 1976. The MBTA purchased the B&M Western Route between Somerville and Wilmington Junction in September 1973 for construction of the Haymarket North Extension.

From 1967 to 1973, a series of state appropriations covered 90–100% of outside-of-district subsidy. This was reduced to 50% in January 1974, substantially increasing the cost of these municipalities. This resulted in several cuts as municipalities refused the higher subsidies: Ayer service was cut to on March 1, 1975; the single Newburyport trip ended on April 1, 1976; and the single Haverhill trip ended on April 2, 1976 (North Andover and Andover having previously ended subsidies.) The single round trip to , never subsidized, was cut to Framingham on October 27, 1975. Amtrak began running the ''Lake Shore Limited'' over that route four days later, restoring rail service to Worcester. State subsidies were increased back to 75% in June 1976 to prevent further cuts.

Combined operations

Rapid transit extension was slower than expected; by 1971, the only extension in service was the first portion of the Red Line Braintree Branch on the Old Colony mainline. In 1972, as part of a funding shift from highways to transit, Governor Francis Sargent initiated a Commuter Rail Improvement Program. On October 8, 1974, the MBTA began using purple to represent the commuter rail system, as had been done in 1965 with the rapid transit lines. MBTA maps began showing the B&M and Penn Central lines as a single system. Penn Central became Conrail on April 1, 1976; the MBTA purchased most of their commuter rolling stock at that time. After delays due to the B&M bankruptcy, the MBTA purchased the B&M commuter equipment, maintenance facility, and of right of way on December 27, 1976. This included all lines with passenger service, as well as a number of freight-only or abandoned lines. This also marked the start of a five-year contract for the B&M to operate the service, replacing a series of one-year contracts. After acquiring the B&M and Penn Central rolling stock, the MBTA painted it with purple, yellow, silver, and black to create a visual identity.

Federal subsidies allowed MBTA subsidies to Penn Central to remain the same until March 1977, when a large increase was expected. Since it owned the tracks and equipment, the MBTA bid out the operating contract, which was won by the B&M. The B&M began operating the southside lines on March 15, 1977; for the first time, all Boston commuter service was operated by one entity. Although all operation was subsidized by this time, a small number of cuts took place. The lightly used Lexington Branch closed after a snowstorm on January 10, 1977. Declining subsidies from Rhode Island resulted in off-peak service being cut back to in April 1979, with peak service cut on February 20, 1981. Woburn Branch service ended on January 30, 1981, amid state budget cuts.

However, the energy crises of the 1970s and the formation of regional transit authorities prompted some expansions and improvements. $70 million in reconstruction work (equivalent to million in ) on the Franklin Line and several northside lines, partially funded by the Urban Mass Transportation Administration, began in 1977 under the Commuter Rail Improvement Program. Service to Haverhill resumed on December 17, 1979, and to and on January 13, 1980. Federally-funded experimental service to Nashua, Manchester, and Concord, New Hampshire ran from January 28, 1980, to March 1, 1981. Little-used stations continued to be closed until the 1980s, but several infill stations were opened, including in 1981, in 1982, in 1984, and in 1985. The MBTA also began replacing the aging Rail Diesel Cars and other equipment; 18 EMD F40PH diesel locomotives and 60 passenger cars arrived between 1978 and 1980.

Several major disruptions occurred in the mid-1980s. On January 20, 1984, a fire destroyed the wooden approach trestles to the North Station drawbridges. The four northside lines used temporary terminals with rapid transit connections while the trestles were rebuilt. Another bridge fire between Beverly and Salem on November 16, 1984, isolated part of the Ipswich/Rockport Line from the rest of the system. Service to North Station resumed on April 20, 1985; service to Ipswich and Rockport resumed on December 1, 1985.

Guilford Transportation Industries purchased the B&M in 1983. This did not initially affect commuter rail operations. Guilford's attempts to regain profitability, which included reducing employee headcount and pay, soon soured labor relations. This resulted in two strikes by Guilford employees; the first shut down the commuter rail system from March 21 to May 12, 1986. Local media was critical of Guilford during the strike; the company did not bid for a renewal of the commuter rail operating contract, which expired at the end of 1986. Amtrak won the contract for commuter rail operations and took over the system on January 1, 1987. Gardner service was cut back to Fitchburg at that time due to a dispute between Amtrak, Guilford, and the MBTA.

Expansions

The late 1980s saw the beginning of substantial expansion of the system. The Southwest Corridor project was completed in 1987 with a new below-ground alignment for commuter rail, Amtrak, and Orange Line trains. Back Bay and stations were completely rebuilt as transfer stations, and opened to serve the growing Longwood Medical Area. The Needham Line, closed since 1979 for construction, was reopened. The Attleboro and Franklin lines had been diverted over the previously freight-only Dorchester Branch during construction; after they returned to the Southwest Corridor, a shuttle service was retained as the Fairmount Line. Peak-hour service to Providence resumed in 1988 (with off-peak and weekend service later added); was added in 1990 as a park-and-ride station to replace . The Franklin Line was extended to in 1988; infill stations in that era included in 1988 to serve Boston Red Sox games at Fenway Park, and in 1990.

Massachusetts had state accessibility laws since 1977 – prior to 1990 federal legislation. At times, the MBTA clashed with state regulators: several stations including West Natick and Chelsea were built without accessible platforms despite state rules; the latter resulted in fines from the Massachusetts Architectural Access Board (MAAB).
second pagethird page
The opening of South Attleboro was delayed by the MAAB because of the MBTA's refusal to build full-length high-level platforms. However, the MBTA did slowly increase accessibility of the system. Most Ipswich/Rockport line stations were made accessible during the 1984–85 closure, and renovations followed at other stations. South Station was made accessible in the late 1980s, Back Bay during the Southwest Corridor project, and North Station in the early 1990s, providing accessibility at the main downtown Boston stations. By 1992, 44 commuter rail stations were accessible.

In 1991, the state agreed to build a set of transit projects as part of the settlement of a lawsuit by the Conservation Law Foundation (CLF) over auto emissions from the Central Artery/Tunnel Project (Big Dig). Among these project were extensions of the Framingham Line to Worcester and the Ipswich/Rockport Line to Newburyport, restoration of the Old Colony Lines ( Middleborough/Lakeville Line and Plymouth/Kingston Line), and addition of 20,000 park and ride spaces outside the urban core. Peak-hour service to Worcester began in 1994, followed by off-peak and weekend service; four intermediate stations were added in 2000 and 2002. Service on the Old Colony Lines began in 1997. and opened in 1998. The MBTA Commuter Rail Maintenance Facility, which replaced the ex-B&M Boston Engine Terminal, was completed in 1998.

Two tenders were submitted in 2003, one from GTI and another from the newly formed Massachusetts Bay Commuter Railroad Company (MBCR), a partnership between Connex (later Veolia), Bombardier Transportation and Alternate Concepts, Inc. MBCR won the contract, and took over the MBTA Commuter Rail operation from Amtrak in July 2003. The MBCR contract originally expired in July 2008 but had an additional five-year option; it was later extended three years to July 2011 and then another two to July 2013. After concerns about on-time performance, the 2011 extension increased the fine for late trains from $100 to $300.

The MBTA considered running the service directly rather than contracting it out, but this "public option" was rejected in 2012. In August 2012, MBCR and Keolis were the two bidders for the contract. On January 8, 2014, the MBTA awarded Keolis the contract for $2.68 billion over eight years, with the possibility of two two-year extensions that could bring the total price to $4.3 billion. Keolis took over the operations on July 1, 2014. Keolis lost $29.3 million in its first year of operation. In June 2020, the MBTA extended the contract through at least 2025.

Free Wi-Fi internet service was piloted in January 2008 on the Worcester Line, where 45 coaches were fitted with routers which connected to cellular data networks. This was the first Wi-Fi available on a commuter rail service in the United States. The program was considered successful; in December 2008, the MBTA announced that Wi-Fi would be available on all trains by mid-2009. In July 2014, the MBTA announced that a private company would be building a new network by 2016 to replace the 2008-built network. The MBTA would not pay for the new network; the company would have a two-tier model with a fee for higher bandwidth. The MBTA canceled the plan in August 2017 due to local opposition to the erection of 320 monopoles, each tall, as well as the need to focus on more critical projects like the Green Line Extension. By that time, the 2008-built system was largely unusable to the decommissioning of 3G networks. Mobile ticketing was introduced on the northside lines on November 12, 2012, and on the southside lines on November 28.

Positive Train Control was implemented on the entire system per a federal mandate, which required installation by the end of 2018 with the possibility of a two-year extension. Construction began in 2017. The final segment of the system to have Positive Train Control activated was the inner Worcester Line on August 15, 2020. Most of the southside lines already had cab signals for automatic train control (ATC) prior to PTC implementation, but the northside lines did not. Cab signals on the southside were completed in 2020. Temporary bus replacements for several lines took place between 2017 and 2022 during PTC and ATC construction and testing. PTC implementation, including cab signals on the northside, was completed in January 2025.

*The Greenbush Line opened in 2007.
*The Riverside-Framingham section was sold to the MBTA in 1976 as part of their larger acquisition of PC commuter assets, but the section past Framingham remained in Conrail control. In September 2009, Conrail successor CSX Transportation and the Commonwealth finalized a agreement to purchase CSX's Framingham to Worcester tracks, as well as the Grand Junction Railroad plus lines which will be part of the South Coast Rail project, to improve service on the Framingham/Worcester Line. After several years of construction and negotiations, ownership of the line was transferred to the commonwealth on October 4, 2012, with increased service on the outer section of the line beginning several weeks later.
*As Big Dig mitigation, MBTA rebuilt existing stations and added 4 new stations along the Fairmount Line. The first of these, Talbot Avenue, opened on November 12, 2012, followed by Newmarket and Four Corners/Geneva on July 1, 2013. Blue Hill Avenue station was opened on February 25, 2019, after many delays.
*Service along the Providence/Stoughton Line was extended further south to T. F. Green Airport in Warwick, Rhode Island in December 2010 and to Wickford Junction in North Kingston in April 2012. This represents the first commuter service in Rhode Island south of Providence since 1981.
*In 2013, the CapeFLYER service began running from South Station to Hyannis on summer weekends – the first direct service from Boston to Cape Cod since 1959. Though officially a Cape Cod Regional Transit Authority service, the CapeFLYER uses MBTA equipment.
*A 4-mile extension of the Fitchburg Line to Wachusett station opened on September 30, 2016.

COVID-19 pandemic

Weekday service was substantially cut on March 17, 2020, due to reduced ridership during the COVID-19 pandemic. On June 22, service was increased to 85% of normal weekday levels. Changes effective November 2 reduced peak service and increased off-peak service, providing more consistent midday headways on some lines; Foxboro pilot service was suspended.

In November 2020, as part of service cuts during the pandemic, the MBTA proposed to close six low-ridership stations. On December 14, the MBTA Board voted to enact a more limited set of cuts, including indefinitely closing five stations. That day, temporary reduced schedules were again put into place, with four of the five stations (, , , and ) not served.

On January 23, 2021, reduced schedules based on the December 14 vote went into place, with no weekend service on seven lines. Service changes on April 5, 2021, increased midday service on most lines as part of a transition to a regional rail model. Weekend service on the seven lines resumed on July 3, 2021. Ridership dropped substantially during the COVID-19 pandemic, with daily boardings just 12,800 during the first quarter of 2021. Ridership rose to 47,100 average weekday boardings in the first quarter of 2022, and 85,000 (69% of 2018 ridership) in October 2022. Limited Foxboro service resumed in May 2022; full pilot service began that September. The service was made permanent effective October 2, 2023.

In April 2024, the MBTA extended the Keolis contract by one year to June 30, 2027, at which time a successor contract will take effect. Silver Hill station reopened on November 18, 2024. In December 2024, the MBTA indicated that the next contract may be split into separate contracts for train maintenance, infrastructure maintenance, operations, and dispatching.

The South Coast Rail project extended service to the South Coast cities of Taunton, Fall River, and New Bedford. A full planning process was held from 1990 until its suspension in 2002. Planning restarted in 2007, with environmental documentation completed in August 2013. Plans were modified into two phases in 2017 due to an increase in costs. Phase I construction to run diesel service as an extension of the Middleborough/Lakeville Line via the Middleboro Secondary took place from 2020 to 2024. Service began on March 24, 2025.

Rolling stock

All MBTA commuter rail service is provided by push-pull trains powered by diesel locomotives with a cab car on the opposite end. The locomotive is usually on the end facing away from Boston so that diesel exhaust does not enter the passenger concourses at North Station and South Station. Trains typically have four to eight coaches (with six the most common) and seat between 400 and 1,400 passengers. Approximately 62 trainsets are needed for weekday service.

The primary heavy maintenance facility is the MBTA Commuter Rail Maintenance Facility, located in the Inner Belt District in Somerville. It is also used for midday and overnight storage of trains on the northside lines. Southampton Street Yard and the Readville Interim Layover facility are used for light maintenance and layover service. Various other layover facilities are used for midday and overnight storage; most are located near the outer ends of the lines. Some maintenance and storage of MBTA equipment is contracted out to the Seaview Transportation Company in North Kingstown, Rhode Island.

Several additional yards are under construction or planned. Two layovers are under construction for South Coast Rail, with service planned for mid-2025, and the Haverhill Line layover at is proposed for relocation later in the 2020s. A new midday layover yard at the former Beacon Park Yard is planned to be constructed by 2032 as part of the realignment of I-90. A large midday and overnight layover yard, which would support expanded service including regional rail and electrification, is planned at Widett Circle near South Station. The MBTA also plans to construct a southside maintenance and layover facility at in 2023–2028, replacing the existing layover yard there, as the Grand Junction Branch will be closed for several years during the I-90 project.

Locomotive fleet

, the MBTA owned 109 locomotives. Of these, 87 were in active passenger service. Eleven were undergoing rebuild, six awaiting repairs, and five retired or out of service. All passenger locomotives are equipped with head end power. Rebuilding of 37 F40PH-2C and F40PHM-2C locomotives to F40PH-3C class by MotivePower

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