The first subway in New York City cost about $100 million per kilometer in 1900 (adjusted for inflation of course). The new subway line being opened this year cost $2.2 billion per kilometer. This is despite over a century of improvements in technology. Here's an interesting HN post, "Forty Percent of the Buildings in Manhattan Could Not Be Built Today" https://news.ycombinator.com/item?id=11736696 In that article is…
A tunnel built in 1900 looks nothing like a tunnel built in 2017. Strength, longevity, safety systems, dimensions, computer controls, power etc etc are all massively upgraded. It's not a fair comparison. That's like saying this electric car [1] from the 1902 would be far cheaper to build than a Telsa in 2017, therefore Teslas are over priced. [1] http://www.intechopen.com/source/html/41483/media/f4.jpg
https://www.youtube.com/watch?v=bE87IPJqW4M
Granted, it's not the most fair comparison, but the cost of subway construction in NY is abomination.
https://pedestrianobservations.wordpress.com/2011/05/16/us-r...