Mapping the world's subways to scale

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There are many ways of mapping subway systems, but they almost always involve bright colors for the different routes, and not-to-scale representations of the systems as a whole. Here, instead, are simple line maps of some of the world's subway systems all drawn to the same scale, While clearly still a work in progress, these maps make it easy to compare the relative length and density of the different systems. There are also some useful comments on the maps at