From the article:
Contrast all of these issues with a city like Istanbul, where the M5, an 18-mile subway line, was built in seven years and for just $630 million.
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That is roughly $35 million per mile. And it is one of the deepest subways in the world. Almost as deep as Moscow's. Meanwhile the 2nd Avenue Subway cost $2.5 billion per mile. That is a difference of 71x.
The big bogeyman that is ignored is the incredible corruption involved with the politicians, contractors and "consultants" who rig these absurd outcomes.
And let's not forget the incredible corruption in Boston and the Big Dig that became a smaller dig with massive cost overruns and delays:
https://en.wikipedia.org/wiki/Big_Dig
One other thing is that in countries like Turkey they build a lot of infrastructure with private funds who run it like a concession for a certain period of time (say 2 decades) and then it reverts back to the government. The private contractors have an incentive to build build inexpensively and quicker as their IRR is ticking.
Examples of such Public Private Partnership projects are:
https://en.wikipedia.org/wiki/Istanbul_Airport
https://en.wikipedia.org/wiki/%C3%87anakkale_1915_Bridge
The concept of PPT:
https://en.wikipedia.org/wiki/Public%E2%80%93private_partner...
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By the way the awesome website of the quoted and mentioned Alon Levy which I discovered years ago when we had a discussion on the disparity of subway costs per mile between the US and places like Prague:
https://pedestrianobservations.com/construction-costs/