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Orange Line Transformation Program

A photo of a construction worker with machinery on tracks, a photo of a new orange line train, and a photo of signal boxes, with an OLT logo banner at the bottom going across all three

As part of the Capital Transformation Program, the Orange Line Transformation (OLT) is upgrading the 120-year-old rapid transit line serving the communities of Malden, Medford, Somerville, and Boston.

The OLT Program will result in faster, more comfortable trips, as well as less crowding. The program will also support the expansion of the Orange Line fleet, which will create space for 30,000 more riders per day. Achieving this requires major upgrades to train yards, maintenance facilities, testing facilities, signals, and power systems.

Building a Better T

As part of our $9.6 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

OLT in 2022

Take a look at the work we've completed recently, and learn more about what's coming up.

All OLT Projects

ProjectLocationStatus
ProjectOrange Line Signal UpgradesLocation orange line SystemwideStatus In progress
ProjectNew Orange Line VehiclesLocation orange line SystemwideStatus In progress
ProjectWellington Yard UpdatesLocation orange line Wellington YardStatus In progress
ProjectWellington Vehicle Maintenance Facility UpdatesLocation orange line Wellington VMFStatus In progress
ProjectOrange Line Traction Power Substation UpgradesLocation orange line Oak Grove, Malden Center, Wellington, Sullivan SquareStatus In progress
ProjectOrange Line Track and Signal Upgrades (2022)Location orange line SystemwideStatus Complete
ProjectTest Track RehabilitationLocation orange line Malden Center to Community CollegeStatus Complete
ProjectStorage Track ExpansionLocation orange line Wellington YardStatus Complete

Be Part of the Orange Line Transformation

We’d like to hear what you think would make the Orange Line more comfortable, accessible, enjoyable, and easy to use.

Tell us what you think

OLT Levels of Transformation

The Orange Line Transformation portfolio of projects is aligned by multiple Levels of Transformation, including:


Orange Line Signal Upgrades

The train detection electronics and relays inside the signal bungalow at Forest Hills Station will be replaced.

The analog signal system on the Orange Line will be fully replaced with new, digital infrastructure.

  • Contract awarded: November 2018
  • Projected completion: Fall 2023
  • Budget: $217 million (total value for Orange Line and Red Line signal upgrades)
  • Status: Design phase one completed, final design phase expected to be complete by fall 2022

New Orange Line Vehicles

New Orange Line train at Assembly Station

The Orange Line fleet will be entirely replaced with modern, more efficient, more spacious vehicles by 2023.

  • Contract awarded: 2014
  • Projected completion: 2023
  • Budget: $1 billion (total value for Orange Line and Red Line new vehicles)
  • Status: Three new train sets accepted for passenger service; up to 14 new trains in service during peak commuting times; more cars in testing

Orange Line Traction Power Substation Upgrades

We’re upgrading four Orange Line Traction Power Substations (TPS) with new facilities and equipment. The upgraded substations will support the new fleet of Orange Line vehicles for the next 25 years.

  • Contract awarded: Spring 2015
  • Projected completion: Fall 2025
  • Budget: $37 million
  • Status: 78% complete

Test Track Rehabilitation

We rehabilitated the 12,000 TF Orange Line test track, which included replacing degraded ties, running rail and fasteners, installing new third-rail heater infrastructure, and resurfacing and alignment. This project was completed in summer 2018, allowing dynamic high-speed testing of the new vehicles without service disruptions.


Storage Track Expansion

We expanded the storage tracks at Wellington Yard, which included constructing 4,000 TF of new track with 13 turnouts, signals, and traction power infrastructure. This project was completed in spring 2019, providing storage for the new Orange Line vehicles.

Public Meetings and Presentations

Learn more about how we’re engaging with the public and the MBTA Board as this program progresses.

Past Events

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Recent Updates

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Contact Us

For questions or comments related to this project, please email the Orange Line Transformation team at OLT@mbta.com.

To report construction issues or noise complaints, please call the OLT project hotline at 617-222-3393.

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Related Projects

Building a Better T

As part of our $9.6 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

Recent Updates

View all project updates