Quote:
Originally Posted by ardecila
Supposedly the reason for that high cost is because they are making a decision NOT to use the tunnel segments already dug, and instead to dig a deep-level tunnel below them including cavern stations mined out of the earth. Not sure why they are intentionally throwing away the existing tunnels, but possibly because the current route turns west under 125th St (which was not contemplated in the 70s) and the tunnel now needs to pass deep below the 2-level Lexington Ave Line.
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Well, you're also not allowed to build subway lines the way they used to. They dig deep bores and mined stations to avoid lawsuits from NIMBYs on the surface complaining about noise and disruptions etc. Back in the day they just tore everything up and people had to deal with the mess for a few years.