The signalling upgrades on the two lines, which total 72km with 41 stations, will reduce headways, increase capacity and maximise fleet performance. The project will be completed in 2022.
Under the contract, Alstom will provide digital audio frequency technology and replace the existing relay-based train control with integrated vital processor interlockings (iVPI), the latest generation of microprocessor-based train control interlocking.
Alstom will also supply its AFTC5 track circuits, which are designed with the capacity to add additional speed commands in the future to take advantage of improved performance of the MBTA fleet, as well as 5F wayside switch machines and LED signal upgrades to the Southwest corridor of the Orange line. It will also provide new, fully wired central instrument houses at Ashmont station and Columbia Junction on the Red Line.
