A few days ago, New York Governor, Andrew Cuomo, accompanied by a film crew, paid a late night visit to the Hudson River Rail Tunnel. His objective was to publicize the sorry state of the tunnel’s physical condition, and to thereby convince the Trump administration that federal funding is urgently needed to help finance the construction of replacement tunnels. The New York Times called it a Hollywood stunt “ . . . designed solely to win over an audience of [the] one who sits in the Oval Office.” True or not, Mr. Cuomo’s efforts should be applauded. It’s encouraging to see a politician up to his elbows in honest dirt rather than mucking about in the sort politician’s usually wallow in. And apart from that, he does an excellent job of pointing out the tunnels’s defeciencies. Listen to Mr. Cuomo’s exposé on the following YouTube video and decide for yourself:
The tunnel (actually a pair of single-track tunnels), presently operates at or above capacity. About 450 trains pass through the tunnels each weekday (averaging one train every six minutes) carrying about 100,000 New Jersey commuters (plus Amtrack passengers) to Manhattan in the morning and back to NJ in the evening. Whenever the tunnel is shut down, those citizens have no other practical way to get to work because the tunnels and bridges for road and subway traffic are also at capacity.
Map showing route of Hudson River Rail Tunnel from North Bergen, NJ to Penn Station, NYC
The 14,575 foot tunnel has been in use for 108 years and shows it. The flooding that occurred during hurricane Sandy in 2012, entered the tunnel through the portals at its eastern (Manhattan) end. As Mr. Cuomo points out in his video, the corrosion caused by salt water has intensified the deterioration within the tunnel. In view of his other comments concerning, rotted steel, crumbling cement, exposed rebar, damaged electrical gear, leaking walls, it’s fair to wonder about risk to human life. Are the tunnels in danger of collapse?
The experts say no. Here’s why:
The tunnel was driven through solid rock except were it passes under the river through accumulated silt. That’s where it proved necessary to construct the tunnel using 23 foot diameter, cast iron rings, each weighing 22 tons. The 2.5 foot wide rings were bolted together, one after the other, to form the two tubes running under the river. The seams between the rings were caulked to make the tubes watertight. The tubes were then lined with concrete. The structural integrity of the tunnel depends on the cast iron shells, not on the crumbling concrete that lines them. That said, if the deterioration inside the tunnel continues to worsen, it will eventually become impossible for trains to pass through it.
The next image shows one of the cast iron rings used to construct part of the Hudson River Rail Tunnel. It was one of the exhibits at the 1907 Jamestown Exposition.
Cast Iron Tunnel Ring exhibited at 1907 Jamestown Exposition