Gateway Program (Northeast Corridor)

The Gateway Program is an ongoing expansion and renovation of the Northeast Corridor (NEC) rail line between Newark, New Jersey, and New York City along the right-of-way between Newark Penn Station and New York Penn Station. The project is intended to build new rail bridges in the New Jersey Meadowlands, dig a new set of tunnels under Bergen Hill (Hudson Palisades) and the Hudson River, and rehabilitate the existing 1910 tunnel, all with the goal of doubling train capacity to four tracks along the right-of-way, since the current two-track rail line, used both by Amtrak and NJ Transit Rail Operations (NJT), has reached its full capacity of 24 trains per hour.

Source: Wikipedia — Gateway Program (Northeast Corridor) (CC BY-SA 4.0)