Second Avenue Subway Phase 2 Expansion

COWI leder designfasen

COWI has been appointed as the lead designer by Connect Plus Partners for Phase 2 of the Second Avenue Subway expansion in New York City. This phase involves a design build contract focusing on tunnelling and structural shell construction and is part of one of the largest transit infrastructure programs in the U.S. Connect Plus Partners, a joint venture of Halmar International and FCC Construction, holds the $1.972 billion contract to extend the subway's Q Line from 96th Street to 125th Street.

Tunneler, stasjoner og fasiliteter

Phase 2 includes approximately 1.5 miles of twin running tunnels, construction of station shells at 116th and 125th Streets, and reuse of an existing tunnel segment from the 1970s to achieve cost savings. Additionally, the project will build above-ground ancillary buildings that will house ventilation, mechanical, and electrical systems with potential for retail and community use on the ground floors. The design and engineering scope also covers scheduling, coordination, and construction to ensure the project's efficient delivery.

Bedre transit for East Harlem

The expansion is expected to benefit the residents and businesses of East Harlem by restoring subway service to the neighborhood, which has lacked rapid transit access for over 80 years. It will add three ADA-accessible stations at 106th, 116th, and 125th Streets, significantly improving mobility, reducing congestion on the Lexington Avenue 4-5-6 line, and enhancing overall system reliability for more than 100,000 daily riders.

Global tunnelkunnskap sikrer prosjekt

The project presents significant technical challenges due to its complex underground environment. COWI brings extensive global expertise in tunnelling and underground design, supported by more than 450 specialized tunnel design professionals worldwide. This expertise is critical to ensuring constructability, safety, and efficiency throughout all project stages.

Byggestart i 2026, ferdig 2030

Construction is scheduled to commence in early 2026, with tunnel boring expected to begin in 2027. The overall contract completion is projected for 2030, marking a major investment in New York City's transit infrastructure designed to improve access and multimodal connectivity on Manhattan's East Side.