The Evolution of Major Urban Subway Networks

Hallways, London

"A long-time limit for world subway networks" recently published in the Journal of the Royal Society Interface investigates how subway systems in major urban areas develop over time. Written by Camille Roth, Soong Moon Kang, Michael Batty and Marc Barthelemy, the article compares the subway systems of major cities.  It looks at Barcelona, Beijing, London, Moscow, New York City, Seoul, and Tokyo, to find similarities of each system's development. The article was discussed by Scientific American, Wired, and the BBC.

This question is remiscent of another article which asks "Are motorways rational from slime mould's point of view?"