Harry Beck designed a diagrammatic map of the London Underground back in 1931. But the Metropolitan Transportation Authority sticks doggedly to this approximately geographical format. Points to note: it has been rotated about 30° anti-clockwise from north-up so Manhattan is straight up and down and Central Park looks unnaturally wide because of stretching needed to show the detail in Midtown.
I also found this even more complicated map dated 2010 June in their archive.
I also found this even more complicated map dated 2010 June in their archive.