 (citation below) GDC is a partnership of the States of New York and New Jersey and Amtrak.The Gateway Program includes the Hudson Tunnel Project, to build a new tunnel under the Hudson River and rehabilitate the existing century-old tunnel, and the Portal North Bridge, to replace a century-old moveable bridge with a modern structure that is less prone to failure.Later projects of the Gateway Program, including expansion of track and platforms at Penn Station New York, construction of the Bergen Loop and other improvements will roughly double capacity for Amtrak and NJ Transit trains in the busiest, most complex section of the Northeast Corridor.