Red Line and Orange Line Signals Systems Upgrades Project

The upgrades to the signal systems will improve safety, increase reliability, and provide smoother trips for riders.

Our electrical engineering team is responsible for the evaluation of existing signal power infrastructure and the design of new signal power infrastructure for the MBTA Red Line and Orange Line Signal upgrades. The project includes upgrades to the train control system for both lines, the Columbia Junction Signal Replacement Project, as well as the Southwest Corridor Wayside Signal Replacement.  

There are approximately 396 track circuits on the Red Line and 271 track circuits on the Orange Line that require upgrades. Both the Red Line and Orange Lines are being re-signaled with next generation digital audio frequency track circuits. The track circuits are designed to include capacity for additional speed commands, two of which will be for the Orange Line and three which will be for the Red Line. We are also retrofitting an existing building to accommodate electrical power requirements for the new signal upgrade, interfacing with signal racks where appropriate, and upgrading the Tenean 13.8kV Substation for additional signal power requirements.