I'm fascinated with New York's subway lines. When I lived in Brooklyn, I was never not amazed at the logistics and complexities of the infrastructure that runs the city. I love learning about the history of transit systems, and this article from The Atlantic about New York's subway lines is a fascinating read. It involves discovery, design, spec, technical debt, and open source--all things that are near and dear to my heart and working life. The complications of a system built in the late 1800's are fascinating.