Pelham - Hutchinson River Pkwys, Bronx
Far Rockaway, Queens

The train is designed to replace the Far Rockaway branch of the in Queens, while freeing the to run directly to JFK Airport. This creates a cleaner service pattern in the Rockaways and strengthens airport access without building an entirely new line from scratch.

From Rockaway Boulevard to Times Square–42 Street, the interlines with the , using existing infrastructure through Queens and Midtown. North of Times Square, the shifts onto the at 50 Street and 7 Avenue, then transitions to the at 57 Street. This phased interlining approach minimizes new tunneling in Manhattan and makes full use of available track capacity.

North of 57 Street, the & runs along a new Fifth Avenue trunk line on the east side of Central Park, providing direct service to 125 Street. This creates a high-capacity north–south corridor on the Upper East Side and relieves pressure on Lexington Avenue.

From 125 Street, the crosses into the Bronx via a new rail bridge near the Willis Avenue Bridge. In the Bronx, it interlines with the along a rebuilt Third Avenue elevated corridor, restoring rapid transit to a major north–south artery that has lacked subway service for decades.

North of Third Avenue, the branches east and interlines with the along a new Fordham Road subway. This feeds into the first true crosstown rapid transit line in the central Bronx, linking major job centers, hospitals, and universities.

The line terminates at Pelham–Hutchinson River Parkways, providing a strong eastern anchor and new park-and-ride access for the northeast Bronx.

Key idea: The is built around reusing existing infrastructure, restoring service to major corridors, and adding new segments only where they unlock significant network value.

Placeholder trunk breakdown.

Placeholder cost section.