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One third of the population of Switzerland lives within 5 kilometers of the main train line crossing the country
(reddthat.com)
Source (yes sorry it's LinkedIn, if you any another one, I'll update): https://www.linkedin.com/posts/prof-stefan-michel_notsweden-train-activity-7210174690827370496-8iJz
I see where you come from, but I guess it's still uncommon to have a third of a country living on a line
Also, the data looks quite good, which is the main objective of this community