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Orange Line Improvement Program

Updated on December 19, 2018

Wellington Yard expansion tracks 33 to 38: Installation of new storage tracks and ballast (September 2018)

About the Project

Timeline: 2015 – 2021
Status: Construction


As the MBTA prepares for the arrival of our new and expanded Orange Line fleet, we’re making infrastructure investments to support storage, testing, and maintenance of the new vehicles. These investments are part of the Red Line/Orange Line Improvements Program.  

This work is being done alongside the signal systems upgrade project, also part of the program.

Orange Line improvements include:

  • Wellington Yard rebuild
  • Maintenance facility improvements
  • Test track rehabilitation
  • Construction of expansion tracks
Aerial map of Orange Line infrastructure improvements, including: test track, Wellington yard expansion and rebuild, maintenance facility.

Wellington Yard Rebuild and Maintenance Facility Improvements

Wellington Yard, where the Orange Line’s vehicles are stored and cared for each day, will get major infrastructure upgrades to accommodate the new fleet.  


  • All new rail yard tracks, power systems, and signals
  • Modern upgrades to the vehicle maintenance facility, which was built in the 1970s, including more space for storage and maintenance, an additional service bay, new diagnostics equipment, and an efficient and environmentally friendly car wash


  • Larger maintenance facility capacity to work on more vehicles at a time
  • New technology within the yard to provide remote early warning diagnostics and maintenance alerts for more efficient vehicle maintenance
  • Replacement of outdated equipment and maintenance facility components to reduce facility maintenance needs and improve vehicle repair times
  • Standardized vehicle turnouts and crossovers to simplify yard maintenance
  • Upgraded track, power, and signals systems so trains can be moved through the yard, stored, and put back into service reliably

Test Track Rehabilitation

Alongside work at Wellington Yard, the test track was rebuilt to test and commission new Orange Line vehicles. 


  • Extension of existing track from Community College to Wellington Station
  • Upgrades to tracks, power systems, and signals


  • New vehicles tested and brought into service
  • Dedicated test track for fewer service disruptions 

Construction of Expansion Tracks

To accommodate the expansion of the Orange Line fleet, current storage tracks will be modified, and new ones will be added.


  • 6 all-new storage tracks 
  • Modification of tracks and addition of turnout for maintenance facility access


  • Improved train movements through the yard
  • Increased vehicle storage
ProjectConstruction Substantial Completion
ProjectOrange Line Test TrackConstruction Substantial CompletionSummer 2018
ProjectWellington Yard Expansion Tracks 33 to 38Construction Substantial CompletionWinter 2019
ProjectWellington Maintenance FacilityConstruction Substantial CompletionSummer 2020
ProjectWellington Yard RebuildConstruction Substantial CompletionSpring 2021


Featured Photos

Contact Information

For all queries and comments related to Orange Line Improvement Program, please contact: