JoeG wrote:Actually the first IRT tunnel between Manhattan and the Bronx, in 1904, was built with a prefab tube. True, the Harlem River is narrower, but the basic technology has been around for at least 110 years or so.
BandA wrote:I-90 Ted Williams Tunnel in Boston is a prefab tube made in sections in a shipyard, floated, dropped into a trench, bolted together then lined. Only part of the "Big Dig" project that came in on-time and on-budget. Complaint was that the trench was too shallow & some ship could breach the tunnel...
2 more fine examples. Didn't know about either.
Backshophoss wrote:The BIGGEST red flag is the PCB layer in the Hudson River bottom,so a dredge,sink a tunnel section,and then cover,
will require some form of EPA oversight/permitting,may become a nightmare.
Drilling a tunnel bore may be the only option,but with "steeper" grades as the trade off to the PCB cleanup problem.
Knowing nothing about PCB removal, I'm wondering how much is down there and how much it would cost to remove a streak of it cutting across the river.
I like Cuomo's statement today, basically 'it's the feds fault'. So helpful, and insightful... *facepalm*. "It's an 8 state problem"... What 8 states?... I'm having a hard time believing PA, MD, Del are feeling serious economic impact every morning when there are service outages.
On a local level it is laughable how Christie has tortured his state by not working on this issue. One of the biggest reasons that parts of north jersey aren't seeing the complete economic overhaul seen in parts of brooklyn & queens is the lack of speedy access to jobs in manhattan. There's over a dozen east river rail & transit crossings, vs. 3 cross hudson routes.
Perhaps this is by political design though - real estate owners are the top political campaign donors around here, and better access to NJ would mean less demand for housing in many parts of NYC where prices are quadruple what they were just 20 years ago. For someone like Cuomo, it seems his only play is to try to pass the blame on, otherwise his real estate developer backers might not like him.