$46.6M Westchester Project To Upgrade Metro-North New Haven Line

WESTCHESTER, NY — The MTA will replace two substations on the New Haven Line in Mamaroneck and Harrison.

The transit agency said rebuilding the substations will improve the power supply capacity and resiliency of the traction power system, along with notable safety and reliability improvements.

This project will improve power supply capacity and resiliency of the AC traction power supply system in the New York State portion of the New Haven Line, according to the railroad. Metro-North’s AC power substation strategy recommends a package of traction power capital improvements, to be implemented in phases.

The New Haven Line AC traction power systems are relatively robust in New York State, according to officials. However, to maintain this robust system, autotransformers must be kept in a state of good repair. Currently, Metro-North is transitioning to indoor AC autotransformer substations for increased resiliency, weather resistance, and employee safety.

The existing 128 and 178 substations at Mamaroneck and Harrison are outdoor switchyards with overhead wires installed in the 1980s. This design is not considered safe, weatherproof, or aligned with current standards. These conditions have made it all but impossible to do a partial rebuild or component replacement of the existing infrastructure and equipment, MTA officials said. Instead, the MTA will replace these substations with new, enclosed ones meeting current standards.

The project with a $46.6 million budget is expected to be completed by early 2027.