Bus division of the Massachusetts Bay Transportation Authority in Boston, Massachusetts
Massachusetts Bay Transportation Authority bus division| Company type | Division of a public agency |
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| Industry | Public transportation |
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| Headquarters | Boston , United States |
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Area served | Boston metropolitan area |
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| Products | Bus transit services |
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| Owner | Massachusetts Bay Transportation Authority (MBTA) |
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| Website | mbta.com |
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The Massachusetts Bay Transportation Authority's bus division manages 151 routes throughout the Boston, Massachusetts metropolitan region, providing connections to the MBTA subway, MBTA Commuter Rail, and other bus lines. Many of these routes have their origins in former streetcar corridors or were once operated by suburban companies such as the Eastern Massachusetts Street Railway and Middlesex and Boston Street Railway. Of these, the MBTA directly oversees 147 routes, while four are operated under contract by private firms, and an additional four suburban services receive partial funding from the MBTA.
As of 2024, the standard fare for local bus rides is $1.70 per trip. The Silver Line's waterfront services (SL1, SL2, SL3, SLW) charge the subway fare of $2.40. Express bus routes feature a two-tier fare structure: local segments are priced at the local fare, whereas express portions on highways cost $4.25.
Service levels were significantly impacted during the COVID-19 pandemic but had largely returned to pre-pandemic frequencies by 2021; however, some routes remain inactive. Since 2018, the MBTA has been developing an extensive bus network overhaul aimed for completion in 2028, with initial modifications commencing in December 2024.
Silver Line
The Silver Line consists of six routes operating as a bus rapid transit system and is marketed as rapid transit. It comprises two main branches: the Waterfront services (SL1, SL2, SL3, SLW) that utilize the South Boston Transitway tunnel, and the Washington Street services (SL4, SL5), which run on surface streets. Waterfront routes charge fares equivalent to the subway system; in contrast, Washington Street routes apply standard bus fares. All Silver Line vehicles are articulated buses measuring 60 feet in length; those servicing the Waterfront branch are hybrid models equipped with extended battery capacity to facilitate electric operation within tunnels.
The SL5 line replaced the former Washington Street Elevated in 2002. The Shuttle service was introduced in 2004, followed closely by SL2 and the initial SL3 also in 2004; SL1 commenced in 2005 featuring dual-mode buses. SL4 began operations in 2009 after plans for a tunnel extension were cancelled. A new SL3 route serving Chelsea started running in 2018.
Crosstown
The MBTA operates two crosstown (CT) routes that provide limited-stop service linking key subway stations and major bus transfer hubs. Initially launched with three routes in 1994, route CT1 was merged into route 1 in 2019.
1–121
These routes cover almost the entirety of local transit within the metropolitan center, many of which have their roots in the streetcar lines once operated by the Boston Elevated Railway. Arranged approximately in a clockwise sequence from the southeast to the northeast, this network has largely preserved its original structure since its BERy inception, adapting through the Metropolitan Transit Authority and MBTA periods. Additional routes have been introduced over time.
Seven routes – , , , , , , and – serve the western suburban communities such as Bedford, Waltham, Lexington, and Needham. These lines descend from services acquired from the Middlesex and Boston Street Railway in 1972 and were reassigned numbers that had previously been retired.
Designated in 2004 as key bus routes, fourteen lines – including , , , , , , , , , , , , , and – represent the highest ridership corridors. They complement the subway system by delivering frequent transit options to Boston’s most densely populated neighborhoods. Beginning in 2024, the MBTA is phasing out the "key route" designation as part of its Bus Network Redesign initiative, replacing it with an expanded network of frequent service routes. Routes 28 and 39 operate with 60-foot articulated buses to accommodate greater passenger volumes.
Four early morning round trips operate between outlying stations and by traversing sections of multiple local routes. Although primarily designed for station agents, these trips are accessible to all riders. Internally numbered 191–194, they appear as variants of local routes in published schedules.
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131–137
Serving the Melrose vicinity, routes 131 through 137 originate from former Eastern Massachusetts Street Railway lines that were incorporated into the MBTA system in 1968. Routes 136 (now discontinued) and 137 once extended briefly to Lowell and Lawrence during MBTA operation. Route 132 was initially operated by Service Bus Lines before MBTA assumed control in 1975.
171
Route 171 provides limited early morning service as a replacement for the CT3 route following its reduction from Logan Airport in 2002. Other routes in the 170 series were short-lived services catering to industrial zones.
201–202
Initially established in 1962 by the M.T.A. from BERY's routes 20 and 21, the former 20 belt route was renamed in 2005 as routes 201 and 202 to better indicate the loop directions around Fields Corner.
210–245
Operating mainly within Quincy, routes numbered 210 to 245 trace their origins to former Eastern Massachusetts Street Railway lines absorbed by the MBTA in 1968. With the gradual inauguration of the Red Line’s Braintree Branch during the 1970s and 1980s, these services were realigned to conclude at newly established rapid transit stations, predominantly .
350–354
Serving the Burlington and Woburn regions, these routes originate from the Eastern Massachusetts Street Railway’s Lowell–Boston line, which was incorporated into the MBTA system in 1968 and later shortened to terminate at Burlington.
411–465
Serving Lynn and the North Shore area, these routes encompass former Service Bus Lines (411, 430) that were incorporated in 1975, along with lines inherited from the Eastern Massachusetts Street Railway since 1968. On weekends, select Haymarket routes featuring a W suffix conclude their trips at Wonderland station.
501–558
These express routes provide service between Newton and downtown Boston utilizing the Massachusetts Turnpike (I-90). The MBTA launched the 500 series in the 1960s following the extension of the turnpike into Boston. The 550 series evolved from Middlesex and Boston Street Railway lines reaching Newton Corner; these were extended downtown in the 1960s, later acquired by the MBTA in 1972, but were shortened back to Newton Corner in 2020.
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| 501
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Brighton Center to Federal Street & Franklin Street in Boston's Financial District
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| 504
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Watertown Yard to Federal Street & Franklin Street in Boston's Financial District
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| 505
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Waltham Center to Federal Street & Franklin Street in Boston's Financial District
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| 553
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Roberts (Brandeis/Roberts station) to Newton Corner
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Privately operated routes
The MBTA provides partial funding for suburban transit lines beyond its primary service zone that connect to the MBTA network. Routes 712 through 716 are radial commuter lines originally managed by private companies—specifically, Rapid Transit Inc. operated routes 712 and 713, Nantasket Transportation managed route 714, and Hudson Bus Lines ran route 716.
Local circulator routes without numerical designations are established by local governments and receive some MBTA financial support. Except for the Beverly Shuttle, which is operated by the Cape Ann Transportation Authority, all these services are run by private contractors.