What is the Gateway Tunnel project? The Hudson Tunnel Project, also known as the Gateway Tunnel Project, is a proposed 9-mile passenger rail track between New Jersey and New York City. The project calls for rehabilitating the existing North River Tunnel that currently carries Amtrak and Northeast Corridor NJ Transit trains in and out of Manhattan. Why is the Gateway Tunnel project needed? Sherrill said it’s imperative to move forward with plans to build a new rail tunnel, which is slated to be completed in 2035.