As part of Metro‑North Railroad’s East of Hudson bridge improvement program, STV delivered resident engineering and construction engineering and inspection services for the demolition and replacement of two single‑track bridges along the Upper Harlem Line. The work ensured continued safe operations along one of the nation’s busiest commuter rail systems while modernizing aging structures in an environmentally sensitive area. STV coordinated all construction activities, material testing validations and permitting with multiple local, state and federal agencies to keep the project on schedule and compliant with strict regulatory requirements.
What challenges did STV address?
A key challenge was the execution of a slide-in replacement of a prefabricated bridge across an active rail line. Because the site is located in a protected wetland that is home to endangered bog turtles, every step required thoughtful planning to avoid ecological impacts. Maintaining safety and service reliability while working within a live rail corridor demanded precise outage coordination, robust communication and meticulous construction oversight.
What solutions did STV deliver?
STV oversaw the staged assembly of shop‑fabricated steel girders on temporary piers before sliding the new bridge into place during a tightly controlled outage window. To protect sensitive habitat, STV recommended installing a perimeter fence and implemented procedures that minimized ground disturbance. The team validated materials, coordinated all required outages and ensured seamless communication among contractors, regulators and Metro‑North.
How does this project benefit the community?
The new bridges enhance safety, reliability and long‑term resilience for riders along the Harlem Line. By modernizing key infrastructure while protecting endangered species and wetland environments, the project supports sustainable rail operations and strengthens a critical commuter link between New York suburbs and the region’s economic core.
Key stats and accolades
- Two single‑track commuter rail bridges replaced
- Slide‑in bridge construction over active rail
- Work performed in endangered bog turtle habitat
- Award recognition from ACEC New York and ACEC National
