tunnels, opened 1908) References External links Includes numerous construction photos. Animated graphic of North River Tunnel construction technique - The New York Times "Tunnel to Terminus: The Story of Penn Station" - National Public Radio Amtrak tunnels Tunnels in Hudson County, New Jersey Tunnels in Manhattan Railroad tunnels in New Jersey Railroad tunnels in New York City Crossings of the Hudson River Pennsylvania Railroad tunnels Tunnels completed in 1910 NJ Transit Rail Operations Historic American Engineering Record in New Jersey New York Tunnel Extension