A long-time limit for world subway networks

@article{Roth2011ALL,
  title={A long-time limit for world subway networks},
  author={Camille Roth and Soong Moon Kang and Michael Batty and Marc Barthelemy},
  journal={Journal of The Royal Society Interface},
  year={2011},
  volume={9},
  pages={2540 - 2550}
}
We study the temporal evolution of the structure of the world's largest subway networks in an exploratory manner. We show that, remarkably, all these networks converge to a shape that shares similar generic features despite their geographical and economic differences. This limiting shape is made of a core with branches radiating from it. For most of these networks, the average degree of a node (station) within the core has a value of order 2.5 and the proportion of k = 2 nodes in the core is… 
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