Submitted by Travertine Libertine.

Transit Maps says:

Created by Matthew Somerville.

Totally hypnotic after a while as all those little yellow train dots start racing around (it kind of reminds me of a mash-up between the Scotland Yard board game and the original Railroad Tycoon). Childhood reminiscing done, it really is amazing what can be done with raw data pulled via an API these days. Stuff like this is the future of transit information.