Awesome Subway Tracery

Here's an oldy-but-goodie a friend reminded us of today: Fakeisthenewreal's drawings of 25 world subway systems all at the same scale. Bonus points if you can identify the four systems above without checking the page first! [Related: FITNR has done a bunch of amazing urban-themed projects, including the Chicago MileXMile page, and this very cool trace of a year of NYC walking.]