Park Avenue Viaduct structural work finishes early

USA: Structural replacement work on New York’s Park Avenue Viaduct has finished 60 months early and $195 million under budget, with Metro-North trains continuing to operate throughout construction.

Park Avenue Viaduct structural work protects a core route

The Metropolitan Transportation Authority replaced or rehabilitated 196 bridge structures and replaced more than 12,600 feet of rail during 28 weekend work periods. According to the official New York State announcement, the work caused no train delays.

The structural program cost $765 million, compared with an initial budget of $960 million. It renewed sections of the 133-year-old elevated steel structure between East 115th Street and East 132nd Street.

The four-track viaduct extends 1.8 miles from East 110th Street to the Harlem River Lift Bridge. It carries about 750 trains and 260,000 passengers daily, accounting for 98% of Metro-North services and every train entering or leaving Grand Central Terminal.

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Prefabricated units kept Metro-North trains moving

Crews completed the structural replacement in two phases. Work between East 115th and East 123rd streets ran from October 2023 to October 2025 and finished 21 months early. The second phase, between East 127th and East 132nd streets, began in May 2024, with the final viaduct replacement installed during the weekend of July 25–26, 2026.

MTA used custom gantry systems to lift and position prefabricated bridge units weighing nearly 190,000 pounds each. Off-site assembly reduced the work required on the viaduct, while coordinated 48-hour weekend windows allowed crews to complete installations around scheduled train operations.

An intertrack containment system created enclosed work zones between active tracks. This separated crews from adjacent train movements and reduced the need for flagging personnel in the constrained corridor.

Remaining work continues through September 2027

Structural replacement is complete, but the wider project remains active. Track replacement, cable installation and removal of temporary fencing and girders are expected to continue until September 2027, as detailed on the MTA project page.