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Re:Hyperloop One Becomes ‘Virgin Hyperloop One’ by zimpenfish on Friday October 13, 2017 @06:24AM (#15464403)
e.g. https://pedestrianobservations.com/2016/12/15/second-avenue-...

> The total length of the project, from 96th Street and 2nd Avenue to 125th Street and Lexington, is about 2.7 km. At $2.2 billion per km, this sets a new world record for subway construction costs, breaking that of the first phase of the same line, which only cost $1.7 billion per km.

Re:Hyperloop One Becomes ‘Virgin Hyperloop One’ by Pxtl on Friday October 13, 2017 @08:34PM (#15470046)
I read one article that blamed the high cost of modern subways primarily on the hyper-elaborate modern subway stations and the actual tunnels are a small component of the cost.
Re:Hyperloop One Becomes ‘Virgin Hyperloop One’ by zimpenfish on Monday October 16, 2017 @04:50AM (#15481762)
I think you're right - tunnels seem to be about $200-400M per km when considered purely on their own.