Mott MacDonald to lead design for MTA Second Avenue Subway Phase II

Expanding New York’s transit network

We have been appointed by the Skanska-Traylor-Walsh joint venture as lead designer on the Second Avenue Subway Phase II project for the Metropolitan Transportation Authority (MTA). Our role focuses on the major design-build package covering excavation, tunneling, and structural shells for the future 106th Street Station and its connecting tunnels.

The 106th Street Station will be constructed at the intersection of 106th and Second Avenue and bring an ADA-accessible Q line stop to East Harlem, reducing commute times for residents of upper Manhattan, the Bronx, as well as residents commuting from the Hudson Valley via the Metro-North Railroad. The project also advances future connections to 116th Street and 125th Street/Lexington Avenue stations, linking the Q line with the 4/5/6 subway lines and Metro-North Railroad, and improving access for hundreds of thousands of daily riders.

Rendering courtesy of MTA

As a critical expansion of New York’s transit network, the project will help address long-standing transit gaps in East Harlem following the removal of the Second Avenue elevated line in the mid-20th century. By extending service and improving connectivity, it will ease congestion on the 4/5/6 lines, reduce pressure on local bus services, and improve overall system resilience.

We will lead structural design, coordinate multidisciplinary design efforts, support excavation and underground rehabilitation, assess adjacent structures, and manage electrical and environmental coordination with utilities and governing agencies. Frank Perrone, group leader for tunnels at Mott MacDonald, said, “Our experience working alongside some of New York’s leading transportation agencies has prepared us to support the MTA in expanding access and improving mobility for New Yorkers.”

The Second Avenue Subway Phase II project represents a major step toward a more connected, accessible and resilient transit system, supporting growing communities and enabling more efficient travel across the city. Construction is expected to reach substantial completion in the third quarter of 2030.