The North River Tunnels are a pair of rail tunnels that carry Amtrak and New Jersey Transit lines under the Hudson River between Weehawken, New Jersey, and the Pennsylvania Station in Manhattan. Constructed in 1910, the North River Tunnels is a critical travel option for commuters on the New Jersey Transit and Amtrak’s busy Northeast Corridor line. These tunnels are active, they allow 24 crossings per hour each way and operate near capacity during peak hours. The tubes run parallel to each other underneath the Hudson River. Their centers are separated by 37 feet. The two tracks fan out to 21 tracks just west of Penn Station.