Re:NYC's brand new subway is the most expensive in the world
by danpalmer on Monday January 02, 2017 @05:57AM
(#13300423)
I see your point, but I my feeling is that the "unknown unknowns" of the New York situation might make up a 50% difference? But we're looking at a >200% difference.
As far as I'm aware, the biggest issues with building deep tunnels like this is everything that gets in the way - other tunnels, utilities, old buildings that might fall down, and rivers. The Crossrail project in the UK has a high pice tag (£15bn) but is also much larger, and given how old London and its infrastructure is, I would imagine has had to cope with a similar number of obstacles, if not more. I imagine Paris is in a similar place given its age.
As far as I'm aware, the biggest issues with building deep tunnels like this is everything that gets in the way - other tunnels, utilities, old buildings that might fall down, and rivers. The Crossrail project in the UK has a high pice tag (£15bn) but is also much larger, and given how old London and its infrastructure is, I would imagine has had to cope with a similar number of obstacles, if not more. I imagine Paris is in a similar place given its age.