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![The busiest metro systems in Europe - line organisation [OC] [914 x 770] : r/MapPorn](https://preview.redd.it/rgwbyavw0qxz.png?auto=webp&s=8b2cc424e4c0e515493728615b7176eb0676960d "The busiest metro systems in Europe - line organisation [OC] [914 x 770] : r/MapPorn")
The busiest metro systems in Europe - line organisation [OC] [914 x 770] : r/MapPorn
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![Metro systems in operation in Europe by 2019 [6]. | Download Scientific Diagram](https://www.researchgate.net/publication/342584705/figure/fig1/AS:908318100967424@1593571319509/Metro-systems-in-operation-in-Europe-by-2019-6.png "Metro systems in operation in Europe by 2019 [6]. | Download Scientific Diagram")
Metro systems in operation in Europe by 2019 [6]. | Download Scientific Diagram
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