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


Notices and Updates

Keolis Early Works – 7-day work schedule to begin August 5

MBTA contractor Keolis continues with work along the railroad right-of-way in Medford between Harvard Street and north of College Avenue, six days a week 6:00 a.m. to 7:00 p.m. As this work remains critical to support the next phases of work leading into construction in 2018, the 6-day work schedule will expand to a 7-day work schedule beginning the weekend of August 5th/6th and continue each weekend through September 23rd/24th. Each weekend, work crews will access the right-of-way at the end of service Friday evening and continue work through start of service Monday morning.

To take advantage of already scheduled work along the right-of-way, Keolis work crews will be joining the MBTA’s Positive Train Control (PTC) project already scheduled to perform night work along the Lowell Commuter Rail Line throughout Medford and Somerville during the aforementioned weekends in August and September.

Work along the railroad right-of-way includes excavation work involving moderate levels of noise. Neighbors will also experience 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 GLX Team apologizes for the inconvenience this work may cause, and has instructed Keolis to work to minimize inconvenience to the community.

The GLX Project is progressing smoothly and we thank you for your patience and support as we work to execute this signature project.

Keolis Early Works – July 18, 2017 Update

Somerville Work – Upcoming Overnight Work

Please be advised that Keolis will be performing night work along the Fitchburg Line as part of the current Early Works project. This work needs to be performed during non-revenue hours. The GLX Team apologizes for the inconvenience this work may cause. All attempts will be made to minimize impacts to abutters.

On Wednesday, July 19, between the hours of 3:00 a.m. and 6:00 a.m., work crews will be moving track materials within the rail corridor in the vicinity of Horace Street and the Medford Street Bridge.

On Friday night, July 21 after the last commuter rail train through 4:00 p.m. on Saturday, July 22, workers will begin the installation of crossover switches between the Medford Street Bridge and Grand Junction.

Work crews will recommence work on Sunday, July 23 at 6:30 a.m. and anticipate completing this weekend’s work by 4:00 p.m.

Keolis Early Works – Summer Construction Season - July 14, 2017 Update

Somerville Work

Work within the railroad right-of-way is being performed 7 days a week, 6:00 a.m. to 7:00 p.m., Monday through Saturday, and 7:00 a.m. to 7:00 p.m. on Sundays. Mobilization activities will begin prior to 7:00 a.m. on Sundays with minimal disturbance to abutters. This 7-day work schedule will extend through the summer construction season. Work will include track and other ancillary work which may involve moderate levels of noise. Weekend work will occur in the vicinity of the Brickbottom Artist Building.

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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