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Commonwealth Avenue Bridge Replacement

Track work on the Green Line B Branch during summer 2018.

Originally constructed in 1965, the Commonwealth Avenue Bridge carries the Green Line B over I-90 and the Worcester Line of the Commuter Rail. The bridge was experiencing deterioration and corrosion in multiple points and was in need of replacement.

  • Contract awarded: May 2015
  • Project completion: August 2018
  • Budget: $110,000,000
  • Status: Complete

Building a Better T

As part of our $8 billion, 5-year capital investment plan, we're renovating stations, modernizing fare collection systems, upgrading services for our buses, subways, and ferries, and improving the accessibility of the entire system.

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An accelerated construction process allowed crews to complete the project over two service shutdowns in 2017 and 2018—conventional techniques would have required four to five years of significant service disruptions.

Project Features

  • Upgraded safety and signals for vehicles
  • Improved pedestrian walkways
  • Dedicated bike lanes with signals
  • New landscaping and lighting elements

Service Impacts

Shuttles replaced trains on the B Branch and the Worcester Line during an 18-day shutdown in summer 2017, which allowed crews to complete work on the eastbound portion of the bridge. In summer 2018, we shut down service for an additional two weeks while crews completed remaining work. 

Regular service resumed when the bridge reopened in August 2018.

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Building a Better T

As part of our $8 billion, 5-year capital investment plan, we're renovating stations, modernizing fare collection systems, upgrading services for our buses, subways, and ferries, and improving the accessibility of the entire system.

Learn more

Related Projects

View all projects