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Capital Transformation

Three photos side by side: a green line train, a train yard full of orange line trains, and a crew member in a hard hat and high visibility vest holding wiring in a signal building. The T logo appears next to "Capital Transformation a division of capital programs" at the bottom

Capital Transformation’s mission is to transform the T by investing in large, long-term system improvements to better the quality of service for MBTA rapid transit riders and neighboring communities.

Improvements include the current transformation programs for the Green, Orange, and Red lines, along with future programs such as Mattapan Transformation.

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

How We're Improving Service

The programs’ capital investments address different levels of transformation, which include:

  • Improving safety
  • Bringing infrastructure into a State of Good Repair
  • Enhancing accessibility
  • Replacing legacy fleets
  • Increasing passenger capacity
  • Modernizing rider experience
  • Expanding service

Each level of transformation aims to improve reliability and overall quality for all riders and communities connected to the T.

Prioritizing Transparency and Communication

In addition to improving service, we strive to provide clear and helpful communication with the public throughout each project. We foster collaboration among internal departments to minimize service disruptions for riders. This includes:

  • Accelerating work whenever possible
  • Increasing accountability through transparent reporting on progress and outcomes

Green Line Transformation Program

four photos: two construction workers tamping down tracks, a person in a GLT hard hat directing a person in a wheelchair, a new green line train, and a green line trolley car full of riders heading to Park Street. There's a GLT logo banner at the bottom going across all four photos

The Green Line Transformation (GLT) is revitalizing the oldest transit line in the United States. This multibillion-dollar program includes new accessible stations, higher capacity vehicles, upgraded maintenance facilities and yards, new tracks and signals, and advanced technology like vehicle collision avoidance.

The portfolio of GLT projects will help improve safety, enhance accessibility, increase capacity, and modernize the rider experience on the Green Line. The GLT team is working closely with the communities of Boston, Brookline, Newton, Somerville, and Cambridge to address impacts on them and meet their needs.

Visit the GLT Program page to learn more

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GLT Program Updates

Learn more about our GLT team members and what we've been working on each week.


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

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

These projects will result in more reliable trips, and less crowding on platforms and in stations. The OLT program will also support the expanding Orange Line fleet, increasing train capacity and rider comfort. Achieving this requires major upgrades to train yards, maintenance facilities, signals, and power systems.

Visit the OLT Program page to learn more

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Red Line Transformation Program

A photo of two red line construction workers, a red line train, and a crew member next to the red line signal wire stacks, with an RLT logo banner at the bottom going across all three

The Red Line Transformation (RLT) is improving the quality of service for the T’s most popular line. The portfolio of RLT projects will help increase the frequency of service, improve reliability, and enhance operations. The RLT program will also support the expanding Red Line fleet, increasing train capacity and rider comfort. Achieving this requires major upgrades to train yards, maintenance facilities, testing facilities, signals, and power systems.

Visit the RLT Program page to learn more

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For More Information

For all questions and comments related to Capital Transformation, please reach out to GLT@mbta.com, OLT@mbta.com, or RLT@mbta.com.

2021 Year in Review

Images of a green line train, workers on orange line tracks, and the red line testing facility with GLT, OLT, and RLT overlayed

We’re looking back at the milestones the Green Line, Orange Line, and Red Line Transformation teams reached in 2021, including four completed projects and one nearing completion.

Read the 2021 summary 

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

2021 Year in Review

Images of a green line train, workers on orange line tracks, and the red line testing facility with GLT, OLT, and RLT overlayed

We’re looking back at the milestones the Green Line, Orange Line, and Red Line Transformation teams reached in 2021, including four completed projects and one nearing completion.

Read the 2021 summary