Mamaroneck and Harrison Substation Replacement

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

To improve reliability on the line, the MTA is replacing two substations on the New Haven Line in Mamaroneck and Harrison.
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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.
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The project with a $46.6 million budget is expected to be completed by early 2027.