Harlem residents are poised to see the completion of a long-delayed extension of the Second Avenue subway line, nearly a century after initial plans were first proposed. On June 2024, New York Governor Kathy Hochul formally broke ground on a $7 billion project to extend the Q line north to 125th Street and Lexington Avenue, adding three new stations at 106th, 116th, and 125th Streets. The expansion is expected to serve approximately 100,000 daily riders and provide connections to the 4, 5, and 6 trains as well as the Metro-North Railroad. Completion is targeted for 2032.
The extension’s history stretches back to the 1920s when economic hardship first halted progress, followed by interruptions during the city’s fiscal crisis in the 1970s. Earlier efforts to extend the line as far as 96th Street in the 2000s encountered prolonged delays. Much of the current construction incorporates tunnels initially dug in the 1970s but abandoned during the city’s near-bankruptcy. In a recent tour of the existing tunnel infrastructure beneath East 116th Street, Governor Hochul described the project as “absolutely transformational,” emphasizing its significance after decades of postponement.
The project recently faced another hurdle when the Metropolitan Transportation Authority (MTA) sued the federal government for withholding nearly $60 million in committed funds. The federal government paused payments in October 2023 amidst a government shutdown and cited ongoing reviews of the MTA’s diversity and inclusion policies as justification. Following revisions in those policies, Congress released the funds in April 2024. The federal government is expected to contribute approximately half of the project’s total cost, about $3.4 billion.
Representative Adriano Espaillat, whose congressional district encompasses Harlem, praised the project for its potential to improve transit access and stimulate economic growth, projecting the creation of 16,000 jobs. He characterized the extension as more than just new stations, but as a vital economic driver for the community.
Technical and logistical challenges remain considerable. Construction crews must integrate the decades-old tunnel beneath 116th Street with new sections being built north and south through difficult soil conditions that include a high water table and unstable “quicksand-like” materials. To address this, crews are employing advanced stabilization techniques such as deep cement injection to harden the soil and prevent flooding during tunneling. Two large tunnel boring machines being manufactured in Germany are expected to arrive by 2025 to extend the line underground to 125th Street.
At construction sites near East 125th Street and Lexington Avenue, excavation work is progressing with rock blasting and installation of watertight barriers underway. More than 100 concrete columns, some as tall as 100 feet, are being installed to support deep excavations required for station entrances.
The first phase of the Second Avenue subway, which added three stations between 72nd and 96th Streets, opened in 2017 after extensive delays and cost overruns, drawing criticism for its high per-mile expense. MTA CEO Janno Lieber, who was not involved in the initial phase, indicated that lessons learned have enabled the current extension to proceed more efficiently and within budget by simplifying design and reducing non-essential spaces within new stations.
Looking ahead, Governor Hochul has allocated $25 million this year to plan a further westward extension along 125th Street, which would connect with the 1 train at Broadway through three additional stations. That phase is anticipated to cost approximately $7.5 billion but does not yet have a finalized completion timeline. Some transit advocates envision even longer-term expansions of the Second Avenue line extending southward into Lower Manhattan.