Fun fact: the vast majority of the NYC system was built between 1904 and 1940 when there were several competing subway companies. Since the subway companies were unified in 1940, essentially no new lines have been built.
The NYC Subway is a relic from a foregone age, from a time when we built things and wasn’t mired in bureaucracy and carbrained thinking.
https://en.m.wikipedia.org/wiki/History_of_the_New_York_City...