Brutally expensive? Sure, when you look at full fare tickets. Since every Swiss, who uses public transport owns a half fare card those prices are (mostly) halfed, though.
When it comes to commuter travel prices become outright reasonable.
The best deal, if you use the train for a regular commute intercity is the Generalabonnement[0].
ca. $4000 (6500 for first class) for a year of unrestricted travel throughout the (almost) whole country on any train is actually a steal.
There are also special saver tickets, restricted to a specific train and usually booked well in advance, which can be outright cheap.
[0] https://www.sbb.ch/en/travelcards-and-tickets/railpasses/ga/...