Red Blue Connector

Red Blue Connector
Charles/MGH station, the proposed terminus of the extension
Overview
StatusProposed
OwnerMBTA
LocaleBoston, Massachusetts
Termini
Stations1 proposed
Service
TypeRapid transit
SystemMBTA subway
Operator(s)MBTA
Daily ridership12,000 (estimated)[1]
Technical
Line length1,500 feet (460 m)
Track gauge4 ft 8+1⁄2 in (1,435 mm)
ElectrificationThird rail, 600 V DC

The Red Blue Connector[2] is a proposed construction project to extend the Massachusetts Bay Transportation Authority (MBTA) Blue Line west to connect to the Red Line, which are the only two MBTA subway lines that lack a direct connection. It would extend the Blue Line 0.4 mi (0.64 km) west beyond the current terminus at Bowdoin station to a new terminus at Charles/MGH station, eliminating the former as a result. The project is suggested to relieve pressure on Downtown Boston stations, overcrowding on the Green Line (which is currently the most convenient way to transfer between the two lines), and to connect communities unlinked by public transit, including Cambridge and East Boston.

An underground connection between the Blue Line and the Red Line has been considered since the 1920s. However, the connector idea did not gain serious traction until the early 1970s. Progress of any kind on the proposed project was mostly stagnant until 1991, when the Commonwealth of Massachusetts agreed to build a direct connection between the two lines as part of the Big Dig highway project. Along with several other transit projects promised during the Big Dig, the connector was never constructed, and the project was briefly put on hold between 2005 and 2006.[3] In the 2010s, continued interest in the project resulted in a renewed effort to design and build the connector. The lack of progress on the connector has been controversial, as the project has been repeatedly delayed or put on hold despite a significant amount of support from politicians and the public.[4][5] As of 2024, design is funded through 30%, but no construction funding has been allocated to the project.[6]

Background

The Blue Line and Red Line are currently the only two MBTA subway rail lines without a direct connection; passengers must either ride one stop on the Green (or Orange) lines to transfer, or walk 0.5 miles (0.80 km) on Cambridge Street between Bowdoin and Charles/MGH.[7]

The Green Line has been the most convenient way to transfer between the Blue Line and the Red Line, causing the segment of the line between Government Center and Park Street to be exceptionally congested, notably during peak travel times. This frequently causes significant delays on the Green Line.[8] It currently takes an average of 11 minutes to travel between Government Center and Charles/MGH during rush hour, by way of the Green and Red lines. The Blue-Red connector is estimated to save riders 4 minutes on average between Government Center and Charles/MGH.[9]

Former Connection

A physical rail connection between the Red and Blue Lines existed in the early part of the 20th century (prior to the MBTA assigning the color designations of the subway lines). Railcars from what is today the Blue Line could emerge from a ramp portal surfacing between Joy Street and Russell Street, just beyond Bowdoin station. The railcars would run on former streetcar track down Cambridge Street and then most of the distance to the western end of the Longfellow Bridge, connecting to what is now the Red Line just east of its Cambridge subway portal, near what is now Kendall/MIT station. Because the tracks were unpowered, individual cars had to be towed along the street at night. This connection was never used in passenger service, but was used to transport Blue Line cars to the Eliot Street Yard maintenance shops then located near Harvard Square station.[10]: 32  When the Blue Line eventually got its own maintenance shops, the connection was removed and the ramp portal was permanently covered in 1952.[11][10]: 52 [12]

Route and Design

Tunnel

The connector would be located in a tunnel underneath Cambridge Street, entirely within the city of Boston. Various construction methods have been considered over the years, including cut-and-cover (C&C), sequential excavation method (SEM), and a deep-bore tunnel constructed using a tunnel boring machine (TBM). The project was originally conceived as a cut-and-cover tunnel, although there has been significant concern regarding surface-level disruption to Cambridge Street if a cut-and-cover tunnel is to be constructed. A deep-bore tunnel was the preferred construction method from 2010 until 2018 when a deep-bore tunnel was ultimately ruled out in favor of a shallow cut-and-cover tunnel.

Stations

As of 2024, only one station is planned as part of the connector. An underground Blue Line platform at Charles/MGH is planned to be built underneath Cambridge Street to the east of the main headhouse. This will provide a direct transfer between the Blue and Red lines without passengers having to exit fare control.

Bowdoin station is planned to be closed if the connector is constructed, due to construction costs and travel time savings. However, prior iterations of the project included a rebuilt or untouched Bowdoin station. Recent plans for the connector indicated that Bowdoin station is planned to serve as a staging area during construction if the connector is built.[13]

Connector Proposals

Early planning

An extension of the East Boston Tunnel to Charles Street was considered in a 1924 study of Charles station.[14] A 1926 proposal to convert the Tremont Street subway and connecting streetcar lines into a pair of rapid transit trunk lines called for the East Boston Tunnel to be extended south to Park Street station, with through service running between Maverick Square and Brighton using the Commonwealth Avenue line. (Three potential alignments were considered: one running south from Bowdoin, and two running southwest from a relocated Scollay Under.)

Side and top views of blueprints of a subway station and connection to an elevated station
One of three potential designs for the Blue Line level at Charles/MGH from the 1986 study

Regional transportation plans from the 1940s to the early 1970s focused on suburban extensions, with no downtown extension past Bowdoin. By the mid-1970s, the rise of Kendall Square as a major employment center, the coming of the Red Line extension to Alewife, and increased traffic to and from Logan Airport created enough demand to justify a direct connection between the Red and Blue lines. A 1974 state plan again proposed an extension to Park Street, while the 1978 and 1983 Program for Mass Transportation updates called for an extension to Charles/MGH instead.[15]

A 1986 MBTA feasibility study for an extension to Charles/MGH evaluated a cut-and-cover tunnel beginning west of Bowdoin Street with no changes to Bowdoin station. The project was then estimated to cost $79–95 million (equivalent to $186–224 million in 2023).[16][17] A 1987 cost-effectiveness study estimated 9,030 daily one-way trips over the extension.[18]

Big Dig

In 1991, the state agreed to build several transit projects as part of the settlement of a lawsuit by the Conservation Law Foundation (CLF) over auto emissions from the Big Dig project. Among these projects was the Red Line–Blue Line connector, which was to be complete by the end of 2011. The reconstruction of Charles/MGH station (rebuilt 2003–2007) was designed to accommodate a future Blue Line platform to the east of the existing headhouse.[19] However, the project was put on hold in 2005 to prioritize other projects providing similar air quality improvements. After another lawsuit from the CLF in 2006, the state agreed to finish designing the connector.[20][21]

The 2010 Draft Environmental Impact Report (DEIR) instead called for a pair of deeper tunnels bored by a tunnel boring machine (TBM), starting east of Bowdoin station and passing underneath the existing platform. Alternatives with a replacement Bowdoin station west of Bowdoin Street, and without a replacement station, were considered; the latter was recommended due to lower cost and reduced travel time. Keeping Bowdoin station and loop was ruled out because evacuation from a disabled train would not be possible in the confined loop, and the eastbound platform is not long enough for six-car trains.[22] Use of a TBM rather than cut-and-cover construction was intended to reduce construction cost and limit disruption on Cambridge Street.[22]: 3–7 

Lacking available funding for design and construction, the MBTA did not complete the design of the extension. The possibility of a public-private partnership (P3) to advance the project was considered in 2013.[23] In 2015, the EPA removed the requirement for the MBTA to complete design.[24]

Project redesign

In 2018, the state commissioned a $50,000 study to reevaluate tunneling methods and their associated costs; it found that contrary to the 2010 DEIR, cut-and-cover tunneling could be considerably less costly than a TBM, albeit with more surface disruption. Cut-and-cover was estimated to cost $200–250 million for the tunnel costs alone, compared to $300–350 million for TBM and the $413 million estimated in the DEIR.[25]: 28  An MBTA long-range planning document from June 2018 considered a pedestrian tunnel between the Orange Line platforms at State and Downtown Crossing, which would allow transfers between the Red and Blue lines similar to (though considerably longer than) the Winter Street Concourse between the Green and Orange lines.[26] In 2019 and 2023, the MBTA indicated plans to spend $15 million to design the connector in a five-year spending plan.[27][28]

A conceptual design completed in 2020 called for cut-and-cover construction, with Bowdoin station still planned for closure. The new Blue Line platform at Charles/MGH would have egresses from the existing lobby and an under-construction MGH development on the north side of Charles Street. Total project cost was estimated as $850 million ($740 million for construction including 30% contingency, $50 million for design, $30 million in administration costs, and $30 million for additional rolling stock), with construction lasting from 2025 to 2030.[29][30] A Notice of Project Change (NPC) was issued on October 2, 2023.[31] In November 2023, the Massachusetts Executive Office of Energy and Environmental Affairs required the MBTA to prepare a Supplemental Draft Environmental Impact Report (SDEIR).[32]

The project has $30M in programmed funding to complete 30% of the design and environmental review. As of June 2024, the connector lacks funding for 100% design and construction.[33]

References

  1. ^ "Red Line Blue Line Connector Fact Sheet" (PDF). MBTA. May 3, 2010. Archived from the original (PDF) on 2011-09-28. Retrieved October 30, 2024.
  2. ^ "Red Blue Connector". Massachusetts Bay Transportation Authority. Retrieved November 13, 2024.
  3. ^ Lynds, John (September 20, 2012). "Red/Blue Line Connector Still Up for Consideration". East Boston Times-Free Press. Retrieved October 30, 2024.
  4. ^ "Disconnect? Internet Report Says Red Line/Blue Line Project is in Jeopardy". East Boston Times-Free Press. September 16, 2011. Retrieved October 30, 2024.
  5. ^ Alosi, James (July 30, 2023). "Are we being 'yessed to death' on Red-Blue connector?". Commonwealth Beacon. Retrieved October 30, 2024.
  6. ^ "Red Blue Connector October 2023 Public Meeting Presentation" (PDF). MBTA. October 16, 2023. Retrieved October 29, 2024.
  7. ^ Buell, Spencer (5 March 2020). "Why Do We Need the Bowdoin Stop, Anyway?". Boston Magazine. Retrieved October 30, 2024.
  8. ^ Levenson, Eric. "Will the MBTA ever connect the Blue and Red lines?". Boston.com. Retrieved October 30, 2024.
  9. ^ "SUMMARY MEMORANDUM: POPULATION, LAND USE, AND RIDERSHIP CHANGES UPDATE TO THE 2010 DEIR FOR THE RED LINE/BLUE LINE CONNECTOR". Massachusetts Department of Transportation. October 15, 2018. Retrieved October 30, 2024.
  10. ^ a b Cudahy, Brian J. (1972). Change at Park Street Under. Stephen Greene Press. ISBN 0828901732. LCCN 72081531.
  11. ^ "MBTA Blue Line". NYCsubway.org. Retrieved October 29, 2024.
  12. ^ "Red Line Blue Line Connector (map)" (PDF). Commonwealth of Massachusetts. Archived from the original (PDF) on September 28, 2011. Retrieved October 29, 2024.
  13. ^ Gosselin, Jack (October 5, 2023). "MBTA proposes Red-Blue connector project, permanent shutdown of Bowdoin station". The Suffolk Journal.
  14. ^ "Plans For New Tunnel Station". Boston Globe. December 9, 1924. p. 1 – via Newspapers.com. Open access icon
  15. ^ Central Transportation Planning Staff (November 15, 1993). "The Transportation Plan for the Boston Region - Volume 2". National Transportation Library. Archived from the original on October 21, 2008.
  16. ^ Johnston, Louis; Williamson, Samuel H. (2023). "What Was the U.S. GDP Then?". MeasuringWorth. Retrieved November 30, 2023. United States Gross Domestic Product deflator figures follow the MeasuringWorth series.
  17. ^ Seelye Stevenson Value & Knecht (December 1986). Bowdoin Station and Charles Street Station Connector Project Feasibility Study (PDF). Massachusetts Bay Transportation Authority. Archived from the original (PDF) on August 16, 2010.
  18. ^ Howard Needles Tammen & Bergendoff; Thomas K. Dyer Inc. (November 1987). Preliminary Ridership and Cost-Effectiveness Analyses Report (PDF). MBTA Bowdoin/Charles Connector Report: Preliminary Design and Environmental Studies Stats Report. Vol. 2. Massachusetts Bay Transportation Authority. p. PR-13. Archived from the original (PDF) on August 16, 2010.
  19. ^ Elkus / Manfredi Architects Ltd – HDR (August 31, 2000). Charles/MGH Station Design Summary Report (PDF) (Report). Massachusetts Bay Transportation Authority. Archived from the original (PDF) on January 2, 2010.
  20. ^ "State agrees to design link between Red and Blue lines". Boston Globe. November 30, 2006. Archived from the original on February 28, 2007.
  21. ^ United States Environmental Protection Agency (July 31, 2008). "Approval and Promulgation of Air Quality Implementation Plans; Massachusetts; Amendment to Massachusetts' State Implementation Plan for Transit System Improvements". Federal Register. 73 FR 44654.
  22. ^ a b RedLine/Blue Line Connector Project: Draft Environmental Impact Report (PDF). Massachusetts Department of Transportation. March 2010. Archived from the original (PDF) on January 8, 2011.
  23. ^ "Red Line / Blue Line Connector P3 Project Suitability Assessment Report" (PDF). Massachusetts Department of Transportation. September 11, 2013. Archived from the original (PDF) on February 2, 2017.
  24. ^ United States Environmental Protection Agency (December 8, 2015). "Approval and Promulgation of Air Quality Implementation Plans; Massachusetts; Transit System Improvements". Federal Register. 80 FR 76225.
  25. ^ "SUMMARY MEMORANDUM: TUNNEL CONSTRUCTABILITY STUDY: UPDATE TO THE 2010 DEIR FOR THE RED LINE/BLUE LINE CONNECTOR". Massachusetts Department of Transportation. October 2018.
  26. ^ Mohl, Bruce (June 18, 2018). "T urges Red-Blue pedestrian link". Commonwealth Magazine.
  27. ^ Mohl, Bruce (April 10, 2019). "T makes quick fix on Red-Blue connector". Commonwealth Magazine.
  28. ^ Patkin, Abby (September 4, 2023). "Here's where the MBTA's Red-Blue Connector stands". Boston Globe. Retrieved October 29, 2024.
  29. ^ Stoothoff, Erik (June 7, 2021). "Red Blue Connector" (PDF). Massachusetts Bay Transportation Authority.
  30. ^ Red Blue Connector Concept Design Report (PDF). Massachusetts Bay Transportation Authority. November 15, 2021.
  31. ^ "Notice of Project Change: Red Blue Connector Project" (PDF). Massachusetts Bay Transportation Authority. October 2, 2023.
  32. ^ Tepper, Rebecca L. (November 13, 2023). "Certificate of the Secretary of Energy and Environmental Affairs on the Notice of Project Change". Massachusetts Executive Office of Energy and Environmental Affairs.
  33. ^ Ionescu, Diana (June 13, 2024). "MBTA Budget Inadequate for Key Projects". Planetizen.

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