This project, with Fluor, Balfour Beatly Infrastructure, Inc., and Herzog Contracting Group, extended the MBTA Green Line from a relocated Lechmere Station in East Cambridge to Union Square in Somerville and College Avenue in Medford.

There were seven new stations constructed as part of the project, including the relocated Lechmere Station. A vehicle storage and maintenance facility were also constructed. In addition to the infrastructure needs of the project, the Community Path, Cambridge, MA was extended. Middlesex supplied 55% of labor and 45% of equipment as a Joint Venture partner of this project. At completion, trains now operate every five to six minutes in the peak periods, providing fast and efficient service to downtown Boston.

By the Numbers

grain

550K Tons
Disposal of Contaminated Soil

grid_on

21K LF
Drainage

home

2
Pump Stations

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139K SF
Noise Wall

242K SF
Retaining Wall

train

8.6 Miles
New Light Rail

22.1M lbs.
Structural Steel

8.25M lbs
Reinforcing Steel

30K CY
Concrete

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>1K
Catenary Poles

attach_money

$1.1B
Project Value

Scope of Work

Relocation of 3.4 miles of New Hampshire Main Line double track and construction of new Medford Branch Green Line tracks
Relocation of 0.9 miles of Fitchburg Commuter Rail double track and construction of new Union Square Branch Green Line tracks
Construction of six new stations and one relocated station
A Vehicle Maintenance Facility, including a transportation building, storage track, and surface parking
Construct a new mile-long viaduct for the Green Line
Replacement or rehabilitation of three roadway bridges and one railroad bridge
Install three traction power substations, OCS, signal, and communication systems for new light rail

Unique Challenges

Maintain the existing New Hampshire line and Fitchburg Commuter Rail service throughout project
Working within an existing narrow ROW corridor, through established neighborhoods, with limited access