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


Construction Activity Information

Construction Outlook (May 8 – 18, 2018) Work schedule subject change based on weather or other factors

For inquiries relating to Green Line Extension construction work please use our Construction Hotline - 1-855-GLX-INFO (459-4636) - 24/7 Coverage. For all other Green Line Extension inquiries please contact the project at

Track Maintenance & Construction

TARGET START: Work Underway

Duration: Early May – mid-June

Areas impacted: Brickbottom Artists Building at Fitchburg St. and McGrath Hwy in Somerville.

Purpose of Work: The purpose of this work is to remove, replace, and relocate sections of train track, switches, and signaling devices as part of the final stages of an Early Works Contract now underway in preparation for the construction of the GLX project.

Approach: The rationale for the timing and duration of this nighttime activity is to take advantage commuter rail outages scheduled on weekend nights during the next 6 weeks. Daytime construction is anticipated throughout this period, 7 days per week, however, nighttime work is not currently anticipated during the week. The MBTA will provide advanced notice should this schedule change.

Impacts: Night time construction work will mean work lights, equipment operation noise and vehicle backup alarms.

Benefits: Moves this important phase of the project forward in an efficient manner.

Clearing and Grubbing (tree & brush clearing + stump & trash removal)

TARGET START: Work underway

Duration: First phase - approximately 30 days.

Areas impacted: East/north side of alignment from Winthrop St. in Medford to Lowell St. in Somerville.

Purpose of Work: Expand the usable space in the right-of-way (ROW) while creating a safe work zone for GLX construction and future train operations.

Approach: Clearing will start north of the College Avenue Bridge (on east/north side of alignment) beginning late April/early May and progress down to Lechmere Station.

Impacts: All work will be conducted in the ROW. Expect some noise from chainsaws and heavy equipment hauling away debris. Weekdays 10 a.m. to 3:30 p.m. Weekend work is expected.

Benefits: At least 90 percent of wood will be recycled, repurposed, or used for lumber. The pest habitat will be greatly reduced.

Pre-Construction Survey

TARGET START: Work underway

Duration: Surveys will take approximately one hour to complete. Work will continue throughout 2018.

Areas impacted: Peer Consultants are now reaching out to homeowners on east/north side of alignment to schedule their surveys.

Purpose of Work: Capture conditions of homes and businesses along the alignment to ensure no adverse impacts of construction.

Approach: Document conditions in the ROW before construction begins in earnest. In late April/early May begin notifying homeowners requesting access to their property (inside & out) to perform survey. Work will again start on the northern part of alignment and progress south. Like clearing work, the survey will start on the east/north side of alignment.

Impacts: Some time commitment by the part of homeowner.

Benefits: Homeowners will receive a report from the survey. This operation will provide some piece of mind regarding to ensure any project impacts are captured.

Pest Control

TARGET START: Work underway

Duration: Abatement work will continue throughout 2018 and duration of project. Contractor will be out on the project several times a week.

Areas impacted: Baiting continues throughout the alignment. No direct impacts, but as Clearing & Grubbing work progresses we will be closely monitoring baiting stations for activity.

Purpose of Work: Reduce chances of pushing rodent issues from ROW into rail neighbors’ properties.

Approach: A rodent habitat inspection on the ROW has been completed and the Green Line Extension Constructors Pest Management Plan has been adjusted based on the findings. Nearly 500 hundred baiting stations have or will be placed along with baiting in hundreds of burrows.

Impacts: Our goal is to reduce the number of rodents and their habitats. Subcontractor will closely monitor this work to minimize off-property impacts.

Benefits: Construction team is working the cities of Somerville, Medford & Cambridge to maximize the effectiveness of their efforts with ours.

Soil Boring & Utility Investigation

TARGET START: Work underway

Duration: On-going through summer.

Areas impacted: Work continues throughout the alignment but locations vary.

Purpose of Work: Determine soil and rock quality to support design efforts. Confirm drawings and utility locations match to avoid possible service interruptions during construction.

Approach: Multiple crews with boring and other earth moving equipment are methodically moving operations throughout the entire GLX construction corridor.

Impacts: Minimal.

Benefits: Soil characterization plays an important part in design.

Pre-Construction Sound Monitoring

TARGET START: Work underway

Duration: Several weeks.

Areas impacted: N/A

Purpose of Work: Install sound monitors to track decibel levels throughout day and night.

Approach: Install sound monitors to track decibel levels throughout day and night.

Impacts: Monitoring creates minimal impact however construction noise will have an impact as the project matures.

Benefits: Allows us to develop plans to minimize noise during construction.

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

Progress Photos


Construction Progress Photos on Flickr

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