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Yes. CFF/SBB/FFS is owned by the federal government and the cantons.
Edit - no it's not. @SwissChap is right - it's wholly owned by the confederation.
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That was my conclusion too, yeah - for some reason some sources mention the Cantons as co-owners, which confused me a bit, but when you look into the official SBB report from 2018 it says that it's wholly owned by the 'Bund' and has been since its inception. I'm assuming there isn't really any source that would be more 'official' than that.
Does the Swiss railway system also have Cantonal government ownership?