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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?utm_source=share&utm_medium=member_ios
Well, it’s probably the longest one, joining west to east, Leman to Konstanz.
It’s also the busiest intercity, mostly because of the Bern-Zurich part but still.
It is named IC1 for a reason, not IC2.
And not stopping in Olten is another big plus 🤷🏻♂️