Brand New Subway: build your own subway system in Detroit (and other cities too)

Found this amazing game a month ago: http://jpwright.net/subway/

The purpose of it is that you build subway lines in cities worldwide, though the ridership figures, fares and grading systems only work in and around New York City, otherwise, they're stuck on no ridership, free fares and a grade of F.

When you open the site there is a box that allows you to jump to another city. Here is an image tutorial on how to jump to Detroit.
http://i.imgur.com/pJaXaEq.png
http://i.imgur.com/TC9NeUD.png
http://i.imgur.com/YUZspVM.png

Unforutnately, it doesn't work too well with loop/circular routes such as the People Mover.

Fortunately, you can also create your own services other than the default New York ones provided, here's a convenient site for HEX codes: http://htmlcolorcodes.com/color-chart/

I myself have created a few Detroit maps for this thing. What do you think?