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49 (MBTA bus)

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Adapted from the English Wikipedia article 49 (MBTA bus), available under CC BY-SA 4.0Updated 7 August 202520 sources
Silver Line
Company typeBus rapid transit
IndustryPublic transportation
Founded2002
FounderMassachusetts Bay Transportation Authority (MBTA)
Headquarters
Boston, Massachusetts
,
United States
Area served
Boston and Chelsea, Massachusetts
ProductsBus rapid transit services (routes SL1, SL2, SL3, SL4, SL5, SLW)
OwnerMassachusetts Bay Transportation Authority (MBTA)
ParentMassachusetts Bay Transportation Authority (MBTA)
Websitewww.mbta.com/schedules/silver-line

The Silver Line operates as a bus transit system serving Boston and Chelsea, Massachusetts, managed by the Massachusetts Bay Transportation Authority (MBTA). Functioning within the MBTA bus network yet marketed as bus rapid transit (BRT), it consists of six routes split between two separate corridors. Weekday ridership reached approximately 27,000 in 2023.

The four routes along the Waterfront depart from an underground terminal at , traveling through the South Boston Piers Transitway—a dedicated bus tunnel located in the Seaport District featuring stations at and . At , the lines branch out: SL1 heads to Logan International Airport, SL2 travels to Dry Dock Avenue, and SL3 proceeds to via East Boston. The SLW operates during peak hours as a short-turn service between South Station and Silver Line Way. These Waterfront routes mainly deploy articulated diesel hybrid buses equipped with extended battery capabilities.

On Washington Street, two routes run between Nubian station in Roxbury and Downtown Boston: SL5 terminates at , while SL4 ends at . Both routes on Washington Street utilize articulated diesel hybrid buses.

This Washington Street corridor replaced the former Washington Street Elevated, an Orange Line rapid transit segment that closed in 1987. Although initial proposals favored extending the Green Line light rail, trolleybuses followed by compressed natural gas (CNG) buses were ultimately selected. Planning for transit access to the Seaport began in 1987, with the South Boston Piers Transitway chosen in 1989 to connect to World Trade Center through Chinatown and South Station; however, construction of the Boylston–South Station section was postponed. In 1999, the MBTA designated these initiatives as the Silver Line and envisioned a tunnel extension from Boylston with a portal at Washington Street for continuous service. Service enhancements on Washington Street commenced in 2001, and despite delays, the $624 million Transitway officially opened on December 17, 2004.

The proposed Phase III tunnel connection was cancelled in 2010 due to budget constraints; instead, a surface route (SL4) launched in 2009. The original SL3 route to ceased operations on March 20, 2009. A new SL3 line to Chelsea—linked to the discontinued Urban Ring Project—was introduced on April 21, 2018, with future plans aiming for extension to . Additional Silver Line expansions and a light rail conversion along Washington Street have been suggested but have largely not advanced.

Criticism from both riders and transit planners centers on the Silver Line’s absence of essential BRT characteristics such as strictly enforced dedicated lanes, off-board fare collection, protected stations, and transit signal priority.

Waterfront: SL1, SL2, SL3

Three Silver Line services operate from , traveling through the South Boston Piers Transitway with underground stops at and stations within the Seaport District. At , these routes diverge:[1]

  • SL1 Logan Airport–South Station
  • SL2 Drydock–South Station
  • SL3 Chelsea–South Station

During peak periods, additional short-turn trips designated SLW run between South Station and Silver Line Way to boost service frequency.[1]

Route SL2 covers Northern Avenue and loops around Drydock and Black Falcon Avenues, stopping at Raymond L. Flynn Marine Park and Flynn Cruiseport Boston. Routes SL1 and SL3 loop back along Haul Road before crossing beneath Boston Harbor via the Ted Williams Tunnel toward East Boston. The SL1 route circles multiple terminals at Logan International Airport, offering several arrivals-level stops. The SL3 line serves , follows Coughlin Bypass Road, crosses Chelsea Creek over the Chelsea Street Bridge, then utilizes a dedicated busway to , making stops at , , and .[1][2] Stations along the Transitway feature full rapid transit amenities; Chelsea busway stops have large shelters while most surface stops provide smaller shelter structures.[3]

Standard rapid transit fares apply on Waterfront routes.[4] Passengers enter through faregates at Transitway stations but pay onboard elsewhere. Boarding is free at Logan Airport stops.[4] Transfers to the Red Line are accessible within fare-controlled areas at South Station; other connections require use of CharlieCard or CharlieTicket as appropriate.[4]

The Waterfront fleet employs articulated buses measuring , equipped with three doors to accommodate higher passenger volumes compared to typical 40-foot buses.[5] These low-floor, fully accessible diesel hybrid vehicles feature extended battery range allowing battery-only operation within the Transitway; they were introduced during 2022–2023. The fleet also includes one extended-range hybrid bus from 2018 and five battery electric buses delivered in 2019. Maintenance is conducted at Southampton Street Garage.[5]

Previously, dual-mode buses operated electrically as trolleybuses inside the Transitway and switched to diesel power on surface segments. Thirty-two Neoplan USA dual-mode buses arrived between 2004 and 2005 and underwent overhauls from 2014 to 2018.[3] Eight of these buses, financed by Massport, were outfitted with luggage racks for airport travelers.[3] However, these vehicles and their overhead wiring proved challenging to maintain and required time-intensive mode changes at Silver Line Way.[6][7]

Between 2018 and 2019, MBTA trialed alternatives including a New Flyer diesel hybrid bus featuring extended battery range that entered service late in 2018.[8][9] In July 2019, five New Flyer battery electric buses were added to both Waterfront and Washington Street routes.[10] By November 2020, MBTA ordered an additional forty-five articulated extended-range hybrid buses intended to replace the dual-mode fleet.[11] The final dual-mode buses were retired in July 2023, marking the end of trolleybus operations in Boston.[5]

Station overview

Area Stop Routes served Inauguration date Connections and remarks
SL1 SL2 SL3 SLW
Financial
District
  1. REDIRECT Template:Boston transportation system
 ● ● ● ● December 17, 2004 Template:Ric: Template:Lnl, Template:Lnl, Template:Lnl
Template:Ric: Fairmount Line, Fall River/New Bedford Line, Framingham/Worcester Line, Franklin/Foxboro Line, Greenbush Line, Kingston Line, Needham Line, Providence/Stoughton Line, CapeFLYER (seasonal)
Template:Ric: Template:Ric, Template:Ric (Template:MBTABus)
Template:Ric: Template:MBTA bus links
Intercity buses at South Station Bus Terminal
Seaport District
  1. REDIRECT Template:Boston transportation system
 ● ● ● ● Template:Ric: Template:MBTA bus links
  1. REDIRECT Template:Boston transportation system
 ● ● ● ●
  1. REDIRECT Template:Boston transportation system
 ● ● ● ●


Discontinued stations

District Stop name Lines served Start date End date Additional information
South Boston 88 Black Falcon Avenue SL2 December 31, 2004 April 2019 "88 Black Falcon Avenue" was closed temporarily in April 2019 for pier maintenance and permanently shut down on March 13, 2022. A projected reopening on June 19, 2022 was ultimately cancelled.
"Black Falcon Avenue & Design Center Place" SL2 2014

-

"Summer Street & Powerhouse Street" "SL3" "March 20, 2009" "Service discontinued due to low passenger volume"

-

"East 1st Street & M Street" "SL3" "Discontinued due to low ridership"

-

"
  1. REDIRECT Template:Boston transportation system
" 		"SL3" "Discontinued due to low ridership"

-

"Farragut Road" "SL3" "April 9, 2005" "August 20, 2005" "Service rerouted following noise complaints"


Washington Street Corridor: SL4 and SL5

Two Silver Line services run along Washington Street connecting Nubian station in Roxbury to Downtown Boston:[1]

  • SL4 operates between Nubian station and South Station
  • SL5 travels from Nubian station to Downtown Crossing

These lines largely share the Washington Street route, featuring dedicated bus lanes and eight stops in between. Beyond Kneeland Street, the routes separate: SL5 continues northward on Washington Street up to Temple Place (close to and ), with a stop at , then heads south along Tremont Street, including a stop at . Conversely, SL4 advances north on Washington Street to Chinatown, then turns east onto Essex Street (which also has a dedicated lane) to serve a surface stop at , before returning south via Surface Road and Kneeland Street.[1] Most stations are equipped with shelters that provide seating, route maps, and real-time arrival information.[12]

Fares for these lines match those of local bus services—more affordable than rapid transit fares—and accept CharlieCard transfers.[4] Paper CharlieTicket transfers are also honored, consistent with their function as substitutes for the Orange Line.[4] This fare policy is inherited from the former route 49 bus, which offered free transfers to the Orange Line at .[12]

The Washington Street Silver Line routes utilize 60-foot diesel hybrid articulated buses featuring three doors.[5] These vehicles are low-floor and fully accessible, incorporating kneeling systems and front wheelchair ramps. The fleet includes 21 New Flyer buses delivered between 2016 and 2017 (from a 44-bus procurement also serving routes and ), replacing older compressed natural gas (CNG) models, alongside three similar hybrids acquired in 2010.[5][13] All Silver Line vehicles are housed and maintained at the Southampton Street Garage.[5][12]

List of Stations

Union Park Street | align=center | ● | align=center | ● | : | East Berkeley Street | align=center | ● | align=center | ● | : | Herald Street | align=center | ● | align=center | ● | : | rowspan=2 Chinatown, Boston Tufts Medical Center | align=center | ● | align=center | ● | :
: | Chinatown | align=center | ● | align=center | ● | :
: | rowspan=3 Downtown Boston Downtown Crossing |  | align=center ● |
 , , 
:  |
Boylston |  | align=center ● |
 
:  |
South Station Under | align=center ● |  | October 13, 2009 |
 , , 
: Fairmount Line, Fall River/New Bedford Line, Framingham/Worcester Line, Franklin/Foxboro Line, Greenbush Line, Kingston Line, Needham Line, Providence/Stoughton Line, CapeFLYER (seasonal)
: , (#Waterfront: SL1, SL2, SL3 SL1, SL2, SL3, SLW)
:
Intercity buses at South Station Bus Terminal |
Chinatown | Chinatown Gate | align=center ● |  | August 19, 2022 |
|
}

Washington Street development

The establishment of the Metropolitan Transit Authority (MTA) in 1947, succeeding the Boston Elevated Railway, initiated four major projects: extending rapid transit to , expanding the Tremont Street Subway to accommodate four tracks, replacing elevated lines including the Charlestown Elevated, Causeway Street Elevated, and Washington Street Elevated with subways, and extending the Cambridge–Dorchester line northwest from . In 1948, the city received authorization to issue $19 million in bonds aimed at extending the Washington Street Tunnel beneath Shawmut Street to connect with the elevated line south of Dudley Square. Although these initiatives were not immediately executed, they established a framework for substituting elevated lines with subways.

Following highway protests in 1972 that led to the cancellation of the planned Southwest Expressway, the corridor was repurposed to serve intercity rail, commuter rail, and the Orange Line, which replaced the Washington Street Elevated. Since the northern corridor lay approximately west of Washington Street, the MBTA—successor to the MTA since 1964—developed plans in 1978 for replacement transit between Dudley Square and Downtown Boston. By 1985, options favored either bus or light rail service along Washington Street, with light rail envisioned as branching off from the Green Line via an abandoned southern branch. When the Orange Line was rerouted in 1987, funding for a light rail alternative was declined by the Urban Mass Transportation Administration. Local sentiment preferred maintaining part of the Elevated until a permanent solution was ready; however, the MBTA upgraded route 49 bus service from feeder to frequent trunk operation instead.

In 1989, MBTA announced plans to introduce trolleybuses on Washington Street operating at 4-minute intervals during peak hours. By 1990, service was anticipated by 1993 alongside proposals for an underground link to Boylston station and a future tunnel connecting to South Boston Piers. After further evaluation, MBTA decided between 1996 and 1997 to implement a bus rapid transit (BRT) line using compressed natural gas buses to avoid reliance on overhead wires. Environmental documentation was submitted in 1998, with construction commencing in 2001. The $27.3 million project allocated $10.9 million for purchasing 17 new buses, another $10.9 million for roadway improvements, and $2.6 million for shelters. Coordinating construction with repaving on Washington Street helped lower expenses. Designed to deliver light rail-level quality service, it was branded as the "Silver Line" and given equal prominence alongside existing subway lines on transit maps; this branding was introduced in 1996.

The Silver Line closely followed route 49’s path between Dudley Square and Downtown Boston, consolidating stops mostly at pre-existing locations. The conversion occurred in stages: December 2001 saw the opening of a contraflow bus-only lane on Washington Street between Marginal Road and East Berkeley Street, allowing southbound buses exclusive use of Washington Street and extending service to a new downtown terminal near Temple Place adjacent to and stations with increased frequency. Silver Line-branded CNG buses began operating on July 20, 2002—the first low-floor buses in Boston—with stops reduced from twenty to eleven; a twelfth stop at was reinstated in November that year. In August 2003, newer bus models replaced earlier vehicles and service frequency increased again. On January 31, 2005, it became MBTA’s first bus route equipped with automated fare collection technology. By that year, ridership had doubled compared to route 49; however, initial gains in travel time were diminished by longer boarding durations.

In February 2020, MBTA agreed to rename Dudley Square station as Nubian following the square’s renaming in December 2019; this change took effect in June 2020. In May 2022, MBTA released a draft redesign of its systemwide network proposing consolidation of SL4 and SL5 into a single Nubian–South Station route to simplify downtown operations; this proposal remained part of the November 2022 draft plan. Additionally, an extra SL4 stop at Chinatown Gate (Surface Artery and Kneeland Street) was introduced on August 19, 2022 during Orange Line maintenance work and has been maintained since then.

Waterfront development

Throughout much of the 20th century, the Seaport District primarily functioned as an industrial hub, featuring rail yards and military installations, with limited bus connections linking to the Red Line at . Following the closure of these bases in 1974 and the subsequent decommissioning of the rail yards, the area was earmarked for commercial redevelopment, creating a demand for expanded transit options.[14] The MBTA's studies in 1987 and the 1989 Draft Environmental Impact Report (DEIR) recommended constructing an underground "transitway" utilizing trolleybus or dual-mode bus technology, designed to connect with the Red, Orange, and Green Lines. This transitway was intended to coordinate with the "Big Dig" project to optimize expenses and had potential extensions planned toward Logan Airport and other transit corridors.[14]

A supplementary DEIR released in 1992 fine-tuned the transitway’s route, receiving final authorization by December 1993. The segment between South Station and Seaport was slated for a 2000 opening, with an extension to Boylston anticipated by 2006. Planned stations at , , South Station, Chinatown, and Boylston were designed with island platforms and included provisions for future conversion to light rail. Early ridership estimates varied significantly—from 24,200 up to 69,800 daily passengers—depending on levels of commercial expansion.[14] In November 1994, the Federal Transit Administration committed $331 million (80%) toward the $413 million initial phase, with environmental clearances finalized by April 1995.[15]

In 1997, Massport abandoned plans for a Logan Airport people mover in favor of deploying dual-mode buses on the transitway via the newly constructed Ted Williams Tunnel. A connecting road linking D Street to Haul Road was incorporated into this plan; these adjustments received approval in 1998.[3] By May 1999, MBTA intended to market this service as the "Silver Line," integrating it with existing Washington Street operations through phased rollouts.[3]

The construction effort was segmented into four primary components amounting to over $370 million in costs. The Russia Wharf portion involved advanced tunneling methods such as ground freezing to safeguard historic structures and included an immersed tube crossing beneath Fort Point Channel. Progress was delayed by a year due to encountering a large boulder during excavation. By late 2000, the project lagged three years behind schedule and exceeded its budget by nearly $200 million; MBTA responded by reallocating federal funds and contingency reserves. Completion arrived in 2004 with a final MBTA expenditure of $624 million, encompassing unexpectedly high expenses for dual-mode buses and maintenance facilities.[15] Despite new developments like a federal courthouse and convention center emerging in the area, early commercial growth fell short of projections; consequently, ridership forecasts were revised downward from 45,000 to approximately 14,000 daily before launch.Cite error: Closing </ref> missing for <ref> tag Due to its inadequate service and perceived inferiority relative to the initially proposed light rail, the Washington Street route earned the derisive nickname "Silver Lie".[16][17]

Although bus rapid transit (BRT) is generally viewed as a cost-effective and quicker alternative to light rail,[6] Silver Line service on Washington Street did not commence until 15 years after the Elevated was dismantled; its initial Transitway segment opened 15 years following the Draft Environmental Impact Report (DEIR), and a planned second phase was never realized. The Transitway construction came with an "enormous cost," making it, by 2007, the priciest single BRT project worldwide.[6][18] Despite construction expenses comparable to light rail but delivering lower service standards,[19] Phase III was projected to cost $2.1 billion—more than triple the Transitway’s expenditure—before being canceled.[20] While ridership in the Seaport area doubled following the Silver Line’s launch, this increase partially reflects commercial growth rather than enhancements in service quality.[6][17]

Quality of BRT Service

Essential characteristics of bus rapid transit include exclusive lanes, frequent operations, off-board fare payment, sheltered stations, and advanced systems such as transit signal priority. A 2011 evaluation by the Institute for Transportation and Development Policy (ITDP) classified the Silver Line as failing to meet BRT standards due to the absence of many required features.

Off-vehicle fare payment is limited solely to three underground stations. Surface-level delays primarily stem from prolonged dwell times caused by boarding through only the front door where passengers pay at a single farebox. On June 6, 2012, Massport initiated a pilot program offering free rides from five Logan Airport stops aimed at reducing congestion within terminals. Within one month, average dwell times per stop decreased by 20 seconds. Massport extended this pilot through January 2013 and subsequently made free fares from Logan permanent. At Washington Street stops with more than fifteen passengers boarding, average dwell times exceed one minute, adversely affecting speed and reliability. A two-week trial in 2017 testing all-door boarding on these routes cut dwell times at busy stops by half and improved schedule adherence; full implementation is planned alongside the AFC 2.0 fare system.

Dedicated bus lanes exist on Washington Street between and , including Essex Street; however, these lanes lack physical barriers and often serve as right-turn lanes at intersections. Double parking frequently occurs due to absence of designated loading zones, with minimal enforcement. Congested areas such as Nubian Square and Downtown Crossing have no dedicated bus lanes. Transit signal priority (TSP) was delayed until 2006 because of coordination challenges. During peak periods, travel times can be up to 1.7 times longer than during free-flow conditions, indicating limited BRT effectiveness. Reliability in headways is mostly compromised by late departures at Nubian Square. In 2020, city authorities introduced enforced bus lanes downtown along with traffic restrictions aimed at improving transit performance.

The Transitway tunnel provides a bus-only corridor free from car traffic but does not offer faster travel compared to previous street-running buses. Designed for maximum speeds up to , narrow lane widths restrict speeds to approximately . Water infiltration has damaged tunnel flooring, resulting in poor ride comfort. The transition point between electric and diesel propulsion at Silver Line Way generates notable delays. Because the Transitway terminates at D Street, buses must cross a traffic signal causing average delays of 1.5 minutes per round trip. A 2016 adjustment introduced a fixed traffic signal cycle but failed to effectively prioritize buses, drawing criticism. Proposed air rights development above the station must maintain options for future grade separation of D Street. Additionally, a gate and movable bollard near this intersection cause further delays.

Typical BRT stop spacing ranges from 0.25 to 0.5 miles; however, even after halving stops on Washington Street, average spacing remains approximately , with some stops as close as . Initially constructed with open canopies only, protected shelters were added starting in 2010. Temple Place features a small glass shelter; Boylston, Chinatown, and Tufts Medical Center stops lack any shelter structures entirely. Surface stops on Silver Line Way and SL2 have glass shelters or none at all; SL3 surface stops are equipped with canopies but no enclosed shelters.

Indirect routing

The Transitway was initially not planned to provide a direct connection to Logan Airport or Chelsea, lacking a dedicated link to the Ted Williams Tunnel. Outbound SL1 and SL3 buses head west along Haul Road from Silver Line Way to reach an eastbound ramp located west of B Street, then continue eastward on a heavily congested segment of I-90. Inbound buses leave I-90 at B Street and proceed east on Congress Street to access Silver Line Way. There exists an eastbound entrance ramp near Silver Line Way, generally reserved for Massachusetts State Police and MassDOT maintenance vehicles, which could reduce outbound travel distance by roughly . MassDOT argues that this ramp was not intended for bus use, although Big Dig planner Fred Salvucci disputes this claim. This ramp was temporarily utilized by outbound buses in 2006 following the Big Dig ceiling collapse, when eastbound tunnel traffic was suspended. The Urban Ring initiative also recommended employing this ramp, and a 2010 study verified its safety for Silver Line buses.

Transit advocates have campaigned to open the ramp for Silver Line operations ("Free the ramp"), but MassDOT raises safety concerns related to normal highway traffic conditions. In 2018, the MBTA hired a consultant to evaluate potential ramp usage. By May 2019, MassDOT authorized a limited trial restricted to evening peak periods and when highway speeds fell below ; these limitations drew criticism from advocates. A three-day test conducted in August 2019 demonstrated average time savings between 3 and 8 minutes per bus, with more significant improvements during times of heavy congestion. Based on these findings, MassDOT planned adjustments to permit ramp use whenever traffic speeds remain under 30 mph.

During a 2023 closure of the Sumner Tunnel, Silver Line buses resumed using this ramp.

Other issues

The SL3 route often faces delays caused by the frequent openings of the Chelsea Street Bridge—up to ten times daily—to allow vessels servicing upstream oil terminals passage. Each bridge opening can result in delays up to 20 minutes, with the sole alternative route requiring a lengthy detour via Route 1A. Federal regulations give priority to marine traffic in these cases. In December 2018, MassDOT proposed a six-month pilot program aimed at reducing bridge openings during peak hours, also addressing the nearby Meridian Street Bridge which serves the busy 116 and 117 bus routes.

The compressed natural gas (CNG) buses introduced on the Washington Street line generated disruptive vibrations at 35 Hz in adjacent residential buildings. It took approximately one year to retrofit the fleet with new mufflers; meanwhile, older buses without this vibration issue were operated during nighttime hours.

See also

External links

Neighborhood Station Service Lines Inauguration Date Transfers and Remarks
SL4 SL5
Roxbury ● ● July 20, 2002 :
● ● :
South End ● ● :
● ● :
● ● November 30, 2002 :
● ● July 20, 2002 :
  1. ↑ 1.0 1.1 1.2 1.3 1.4 Cite error: Invalid <ref> tag; no text was provided for refs named busmap
  2. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named netransit
  3. ↑ 3.0 3.1 3.2 3.3 3.4 Cite error: Invalid <ref> tag; no text was provided for refs named 2007report
  4. ↑ 4.0 4.1 4.2 4.3 4.4 Cite error: Invalid <ref> tag; no text was provided for refs named tariff
  5. ↑ 5.0 5.1 5.2 5.3 5.4 5.5 Cite error: Invalid <ref> tag; no text was provided for refs named roster
  6. ↑ 6.0 6.1 6.2 6.3 Cite error: Invalid <ref> tag; no text was provided for refs named ITDP
  7. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named stateofthesystem
  8. ↑ (Press release). {{cite press release}}: Missing or empty |title= (help)
  9. ↑ {{cite magazine}}: Empty citation (help)
  10. ↑ (Press release). {{cite press release}}: Missing or empty |title= (help)
  11. ↑ {{cite web}}: Empty citation (help)
  12. ↑ 12.0 12.1 12.2 Cite error: Invalid <ref> tag; no text was provided for refs named 2005report
  13. ↑ "MBTA Purchases Dozens of New, High Capacity Buses" (Press release). Massachusetts Bay Transportation Authority. October 6, 2015.
  14. ↑ 14.0 14.1 14.2 Cite error: Invalid <ref> tag; no text was provided for refs named feis
  15. ↑ 15.0 15.1 Cite error: Invalid <ref> tag; no text was provided for refs named gao2000
  16. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named localdiversity
  17. ↑ 17.0 17.1 Cite error: Invalid <ref> tag; no text was provided for refs named anson
  18. ↑ (Report). p. 8. {{cite report}}: Missing or empty |title= (help)
  19. ↑ . p. 501. {{cite book}}: Missing or empty |title= (help)
  20. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named littledig

Related profiles

SSilver Line (MBTA)SSL2 (MBTA bus)SSL1 (MBTA bus)SSL4 (MBTA bus)
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