From
SBB:
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1-day travelpasses and class upgrades. With a 1-day travelpass, you can travel wherever you want to in Switzerland using public transport. There is no better way to discover the country’s most beautiful regions. Step onboard!
With a 1-day travelpass, you enjoy unlimited travel on trains, post buses, boats and municipal transport
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and the PDF above highlights it all. Did your source point out to one of the few exceptions ?