Chicago's Red Line is around 22 miles long but is underground for, I'm estimating, about 7 miles (roughly Armitage to Roosevelt). That's as long as the subway b

Chicago's Red Line is around 22 miles long but is underground for, I'm estimating, about 7 miles (roughly Armitage to Roosevelt). That's as long as the subway bring talked about here. So if this is a subway, then Chicago definitely has a subway. The Blue Line is underground for probably about the same distance (goes under South of Addison and then hits the Loop, heads West, and reemerges West of Clinton). My estimate might be a bit off, I'll just going off my mental map of the city.