Red Line completes testing on new digital signal system as upgrades to the line continue
The MBTA announced Tuesday that critical infrastructure improvements along the Red Line Ashmont branch are complete. A service suspension from May 14 to 16 allowed the T to perform track and tamping work, make major upgrades to the power infrastructure, and conduct testing of the Red Line’s new digital signal system.
The new signaling system will modernize the T’s train control infrastructure, improving operational reliability and enhancing the rider experience. Digital signaling requires less manual labor than the current analog system, reducing long-term costs and maintenance frequency.
At a price point of $295.5 million, combined work on the Red and Orange Lines’ signals is set to be completed in late 2026.
The Mattapan Trolley also received work, with crews completing critical upgrades to the Codman Yard Facility power substation, which powers the entire line. The trolley received a new conduit installed over the Adams Street Bridge, protecting critical infrastructure from corrosion and damage. Inspections and repairs were made to bridges, retaining walls, and ramps, improving accessibility at and around trolley platforms, officials said.
“I’m proud of the MBTA for completing another major step in modernizing the Red Line, which leads to improved reliability for all of our riders,” said Interim Secretary of Transportation and MBTA General Manager Phillip Eng. “I want to thank our crews for their work and to our riders for their patience while these valuable signal, track, and power upgrades were completed.”
These upgrades come as part of the Red Line Program, a series of projects meant to enhance the operations of the T’s busiest line. It will also replace the Red Line’s 30-year-old cars with 252 new vehicles, including 34 more being added to the fleet. New cars have already begun hitting the tracks and include new on-vehicle technology improving communication, visual displays, and other interfaces. The cars were designed with accessibility in mind, featuring wider doors and additional seating options.
Upgrades to South Boston’s Cabot Yard have been ongoing since 2023. The overhaul includes all new rail yard tracks, power systems, and signals, new diagnostic equipment, and improved infrastructure for car repair, cleaning, and crossover.
As signal work continues, shuttle buses will replace service starting at Broadway for both the Braintree and Ashmont service lines. Commuter Rail service will be fare-free between South Station and Braintree during this work.
