MTA Finishes Park Avenue Viaduct Structural Work Years Early and Under Budget

Prefabricated bridge units lifted by custom gantries let crews replace the structure without halting Metro‑North service, creating a model for faster, lower‑cost rail upgrades.

Overview

Officials announced Monday that the MTA completed the Park Avenue Viaduct structural replacement 60 months ahead of the original schedule and about $195–$200 million below the initial $833 million budget.
The project replaced 196 bridge structures and more than 12,600 feet of railroad using weekend, 48‑hour work windows that began in October 2023 and ran across 28 weekends.
Crews built large concrete bridge segments off site and installed them with custom gantry systems and intertrack containment that allowed adjacent Metro‑North tracks to remain open during work.
Metro‑North continued to operate through the structural phase and recorded a 97% on‑time performance rate, and the MTA says remaining tasks — track replacement, cable work and removal of temporary fencing and girders — will finish by September 2027.
The viaduct carries roughly 750 trains and about 260,000 riders daily into Grand Central Terminal and the project is part of a larger MTA capital push to shore up aging steel and concrete structures while some nearby small businesses report severe hardship from forced relocations.