I was wrong. The latest expansion was $3.5 billion per mile. https://www.nytimes.com/2017/12/28/nyregion/new-york-subway-construction-costs.html https://www.ny

I was wrong. The latest expansion was $3.5 billion per mile. https://www.nytimes.com/2017/12/28/nyregion/new-york-subway-construction-costs.html https://www.nytimes.com/2017/12/28/nyregion/new-york-subway-...