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Red Blue Connector

A digital rendering of a possible future Blue Line platform at the Charles/MGH station

The Red Blue Connector project would connect the Red and Blue lines by extending the Blue Line below Cambridge Street to Charles/MGH station on the Red Line.

Project History

A Draft Environmental Impact Report was submitted in 2010 and received a certificate from the Secretary of Environmental Affairs.

In 2018, analysis was conducted to revisit assumptions from the 2010 Draft Environmental Impact Report with a focus on constructability of the tunnel and changes in land use, demographics, and ridership.

In 2021, the Red Blue Connector Concept Design Report was completed, drawing from both the 2010 Draft Environmental Impact Report and 2018 tunnel constructability study.

What We're Working On 

We are working on preliminary engineering to complete state and federal environmental reviews, and continuing coordination with stakeholders.

In support of the state environmental review process, Environmental Justice Screening forms for the project can be found below:

Contact Us

For more information about the Red Blue Connector, please email

To sign up for project email updates, please subscribe here.

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