MBTA Silver Line

A Silver Line bus at South Station in 2023
Parent	Massachusetts Bay Transportation Authority
Founded	July 20, 2002 (Washington Street) December 17, 2004 (Waterfront)
Locale	Boston and Chelsea, Massachusetts, US
Service type	Bus rapid transit (disputed)
Routes	6
Stops	15 (Washington Street) 20 (Waterfront)
Hubs	South Station, Nubian
Fleet	21 (Washington Street) 50 (Waterfront)
Daily ridership	39,000 (Q2 2019)[1]
Fuel type	Diesel hybrid
Website	MBTA – Bus
System map Show interactive map Show static map

The Silver Line is a system of bus routes in Boston and Chelsea, Massachusetts, operated by the Massachusetts Bay Transportation Authority (MBTA). It is operated as part of the MBTA bus system, but branded as bus rapid transit (BRT) as part of the MBTA subway system. Six routes are operated as part of two disconnected corridors. As of 2019^[update], weekday ridership on the Silver Line was 39,000.

The four Waterfront routes operate out of an underground terminal at South Station and run through the South Boston Piers Transitway – a dedicated bus tunnel through the Seaport District with stations at Courthouse and World Trade Center. At Silver Line Way, they fan out on the surface: the SL1 to Logan International Airport, the SL2 to Dry Dock Avenue, and the SL3 to Chelsea via East Boston. An additional short turn route, SLW, runs only at peak hours between South Station and Silver Line Way. The Waterfront routes use mostly articulated diesel hybrid buses with extended battery range. Two routes operate on Washington Street between Nubian station (at Nubian Square in Roxbury) and Downtown Boston. The SL5 terminates at Downtown Crossing and the SL4 on the surface at South Station. The Washington Street routes use articulated diesel hybrid buses.

The Washington Street corridor was built to replace the Washington Street Elevated, which was used by the Orange Line rapid transit line until 1987. Initial plans called for a light rail branch of the Green Line, but trolleybuses and later CNG buses were substituted. Planning began in 1987 for mass transit to serve the growing Seaport; a new transit tunnel called the South Boston Piers Transitway was chosen in 1989. It was to run from Boylston to World Trade Center via Chinatown and South Station, though the Boylston–South Station section was later deferred as a separate phase. In 1999, the MBTA designated the Washington Street and Transitway projects as the Silver Line, and planned for the Boylston tunnel extension to include a portal to Washington Street for through-running. Service improvements on Washington Street began in 2001. After years of delays, service through the $624 million Transitway began on December 17, 2004.

The connecting tunnel (Phase III) was cancelled in 2010 due to rising costs; a surface route (SL4) was introduced the previous year. The original SL3 route to City Point was discontinued on March 20, 2009. A separate SL3 route to Chelsea – originally planned as part of the cancelled Urban Ring Project – began service on April 21, 2018. Extension of the SL3 route to Sullivan Square is planned. Several other Silver Line extensions have been proposed, as has a conversion of the Washington Street corridor to light rail, but most have not been pursued. The Silver Line has been the target of criticism by riders and transportation planners. Much of the system is missing BRT Standard features such as enforced dedicated lanes, off-vehicle fare collection, sheltered stations, and transit signal priority.

Routes

Waterfront: SL1, SL2, SL3

v t e Waterfront routes
Legend
Terminal B Stop 2 Terminal B Stop 1 Terminal C Terminal A  SL1  Terminal E  SL3  Chelsea Design Center  SL2  Bellingham Square Drydock Avenue & Black Falcon Avenue Box District 27 Drydock Avenue Eastern Avenue 23 Drydock Avenue Chelsea Street Bridge Day Square (planned) Tide Street Airport Harbor Street Ted Williams Tunnel under Boston Harbor Silver Line Way  SLW  World Trade Center Courthouse South Station  SL1   SL2   SL3   SLW

Three Silver Line services operate from South Station in a dedicated tunnel, the South Boston Piers Transitway, serving the underground Courthouse and World Trade Center stations in the Seaport District then splitting at the Silver Line Way surface station:^[2]

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

During rush hours, additional short turns (designated SLW) are run between South Station and Silver Line Way to increase frequency in the Transitway.^[2]

Route SL2 runs on Northern Avenue, then on a one-way loop on Drydock Avenue and Black Falcon Avenue with multiple stops serving the Raymond L. Flynn Marine Park and the Flynn Cruiseport Boston. Buses run clockwise around the loop, with a layover at 23 Drydock Avenue. From Silver Line Way, route SL1 and SL3 buses loop backwards on Haul Road, then cross under Boston Harbor in the Ted Williams Tunnel to East Boston. Route SL1 loops around the Logan International Airport terminals, with stops at the arrivals level of each terminal (including two separate stops at lengthy Terminal B). Route SL3 serves Airport station, follows the Coughlin Bypass Road, and crosses Chelsea Creek on the Chelsea Street Bridge. It then follows a dedicated busway to Chelsea, with intermediate stops at Eastern Avenue, Box District, and Bellingham Square.^[2][3] The three Transitway stops are full rapid transit stations; the Chelsea busway stations have large concrete shelters, while most other surface stops have small shelters.^[4]: 10

The Waterfront routes have regular rapid transit fares.^[5]: 13 Passengers enter through faregates at the three Transitway stations, and pay at the on-board farebox at all other stops.^[4]: 12 Fares are free when boarding at the Logan Airport stops.^[5]: 31 Transfer is possible to the Red Line within fare control at South Station. Normal transfers to other routes are available with a CharlieCard; transfers to/from the Blue Line at Airport and the Washington Street routes are available with a CharlieTicket.^[5]: 27

The Waterfront routes use 60-foot (18 m) articulated buses with three doors, which provide greater capacity than standard 40-foot (12 m) transit buses.^[6] The buses are low-floor and fully accessible, with kneeling bus technology and a wheelchair ramp at the front door. The main Waterfront fleet consists of 45 diesel hybrid buses with extended battery range – sufficient to run through the Transitway on battery power – which were delivered in 2022–2023. A similar extended-battery-range hybrid bus built in 2018 and five battery electric buses built in 2019 are also used. All Silver Line buses are maintained at Southampton Street Garage.^{[6][7]: 2.8}

The Waterfront routes previously used dual-mode buses which operated as electric trolleybuses between South Station and Silver Line Way, and as conventional diesel buses on the surface branches. The 32 dual-mode buses, built by Neoplan USA, were delivered in 2004–05 and overhauled from 2014 to 2018.^{[4]: 11 [8]} Eight of the buses were funded by Massport and included luggage racks for airport passengers.^[4]: 11 The dual-mode buses (and overhead lines in the Transitway) proved difficult to maintain and required a time-consuming switch between modes at Silver Line Way.^[9][10] In 2018–19, the MBTA obtained several buses to test alternate options for Waterfront service. A single New Flyer diesel hybrid bus with extended battery range was obtained as an option on a separate order; it entered testing in September 2018 and revenue service in December.^[11][12] On July 31, 2019, the MBTA began using five New Flyer battery electric buses on both Waterfront and Washington Street routes.^[13] In November 2020, the MBTA exercised a contract option for 45 additional 60-foot hybrid buses with extended battery range (similar to test bus #1294) to replace the dual-mode Silver Line fleet.^[14] The final dual-mode buses were retired in July 2023, ending trolleybus operations in the Boston area.^[6]

Station listing

Zdroj:https://en.wikipedia.org?pojem=SL3_(MBTA_bus)
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Neighborhood	Station	Services				Service began	Transfers and notes
		SL1	SL2	SL3	SLW
Financial District	South Station	●	●	●	●	December 17, 2004	Amtrak: Acela, Lake Shore Limited, Northeast Regional MBTA Commuter Rail: Fairmount, Framingham/Worcester, Franklin/Foxboro, Greenbush, Needham, Old Colony, Providence/Stoughton, CapeFLYER (seasonal) MBTA subway:  Red   Silver  (SL4) MBTA bus: 4, 7, 11 Intercity buses at South Station Bus Terminal
Seaport District	Courthouse	●	●	●	●		MBTA bus: 4
	World Trade Center	●	●	●	●
	Silver Line Way	●	●	●	●
East Boston	Terminal A	●				June 1, 2005	MBTA bus: 171 Massport: 11, 22, 55, 66, 88 Intercity buses and Logan Express
	Terminal B Stop 1	●					MBTA bus: 171 Massport: 11, 22, 55, 66, 88 Intercity buses and Logan Express
	Terminal B Stop 2	●					MBTA bus: 171 Massport: 11, 22, 55, 66, 88 Intercity buses and Logan Express
	Terminal C	●					MBTA bus: 171 Massport: 11, 33, 55, 66, 88 Intercity buses and Logan Express
	Terminal E	●					MBTA bus: 171 Massport: 11, 33, 55, 66, 88 Intercity buses and Logan Express
	Airport			●		April 21, 2018	MBTA subway:  Blue  MBTA bus: 171 Massport: 22, 33, 55, 66, 88
Chelsea	Eastern Avenue			●			MBTA bus: 112
	Box District			●
	Bellingham Square			●			MBTA bus: 111, 112, 114, 116, 117
	Chelsea			●			MBTA bus: 112, 114 MBTA Commuter Rail: Newburyport/Rockport
South Boston	Northern Avenue & Harbor Street		●			December 31, 2004	MBTA bus: 4
	Northern Avenue & Tide Street		●				MBTA bus: 4
	23 Drydock Avenue		●			c. 2006[15][16]	Relocated from 21 Drydock Avenue in 2016[17]
	27 Drydock Avenue		●			December 31, 2004	Former stop at 25 Drydock Avenue closed in January 2016, relocated stop opened 2018[18][19][20]
	Drydock Avenue & Black Falcon Avenue