Massachusetts Bay Transportation Authority (MBTA) Massachusetts Department of Transportation
Green Line Extension Green Line Extension
GLX Construction


Notices and Updates

View our May 31 Neighborhood Abutter Meeting Presentation for Early Works Construction near Tufts.

Keolis Early Works – June 23, 2017 Update

As construction continues along the railroad right-of-way in Medford and Somerville, abutters can expect to see ongoing supportive excavation work, including soil excavation, trenching, and pile installation in the vicinity of Tufts University in Medford in the coming weeks.

For the week beginning June 26, 2017, it is anticipated that work hours in the MBTA railroad right-of-way will increase to include daytime work on Saturdays. Please be advised that the work schedule for the immediate future will be Monday through Saturday, 7:00 AM to 6:00 PM. This work will include drilling piles and excavation work which will involve moderate to high levels of noise.

Abutters may also notice temporary fencing installed along the right-of-way as a safety requirement for construction. It is anticipated that this 6-day work schedule may extend through the summer construction season.

Neighbors may also see increased construction vehicle traffic in the vicinity of Colby Street and Tufts University as materials and equipment are delivered to and removed from the railroad right-of-way.

The additional weekday and Saturday work hours have been scheduled to allow contractors to decrease the overall construction duration for this contract. We appreciate your continued cooperation during this period.

Keolis Commuter Services, LLC has been contracted by the MBTA to perform the Early Work packages - a portion of the GLX commuter rail work scope. Work will be occurring along the railroad right-of-way in Medford (roughly between Harvard Street and north of College Avenue), in Somerville (roughly between McGrath Highway and Prospect Street and along New Washington Street and Cobble Hill Road) and will include track work, utility relocations, signal infrastructure, and associated drainage and earthwork improvements. The overall scope of work to be performed by Keolis contractors is scheduled to last through early 2018.

Emergency Contact Info


For emergencies relating to Green Line Extension construction work please use our
Emergency Construction Hotline - 1-855-GLX-INFO (459-4636) - 24/7 Coverage

For all other Green Line Extension inquiries please contact the project at



MBTA Construction Contract Number Notice to Proceed Current Status
E22CN01 - GLX Phase 1 1/31/13 in close-out phase
E22CN02 - IGMP-01 10/2/14 in close-out phase
E22CN03 - IGMP-02 10/2/14 in close-out phase
E22CN04 - IGMP-03 10/2/14 in close-out phase
E22CN06 - IGMP-04A 11/25/14 in close-out phase
Keolis Early Works February 2017 Ongoing through early 2018
E22CN07 - Design Build February 2018 In procurement phase

Progress Photos


Construction Progress Photos on Flickr

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