The Metropolitan Transportation Authority (MTA) has completed the structural replacement of the Park Avenue Viaduct, finishing the project 60 months ahead of schedule and $195 million below its original budget. The $765 million project replaced aging sections of the 133-year-old elevated rail structure that carries Metro-North Railroad service between East 110th Street and the Harlem River Lift Bridge.
Construction began in October 2023 and included the replacement of 196 bridge structures and more than 12,600 feet of track infrastructure. The viaduct carries 98 percent of Metro-North train services and every train operating into and out of Grand Central Terminal, making it one of the railroad’s most critical assets.
The MTA completed the structural work over 28 weekend construction windows while maintaining regular train operations. Crews installed prefabricated bridge units using custom gantry systems that reduced on-site construction time and eliminated the need for major service disruptions. The agency also used enclosed work zones between active tracks, allowing construction to continue safely alongside operating rail services.
The project has now entered its final phase, which includes track replacement, cable installation, and the removal of temporary fencing and support girders. The MTA expects to complete the remaining non-structural work by September 2027. The upgraded viaduct will improve the long-term reliability and resilience of one of the busiest commuter rail corridors in the United States.