Dodecahedron314

Bus and then half the metro lines in the city--after that trip, there are only two lines I haven't ridden. The transportation geek friend whose idea this was has now ridden all 8, which was why we did this in the first place--we went all the way to the northernmost line in the system, which was the only one she hadn't ridden yet. It was a good day, and I very much needed the opportunity to get as far away from campus as possible that day.

Which métro system is this?

Well, it's not quite a "metro" per se, it's the El train system in Chicago. (Though I'm not entirely sure if there's a difference, because I've never lived anywhere with a proper metro system that actually calls itself as such.)