Voralpen-Express
A genuine panorama train that fits a half day. S-Bahn to Rapperswil (~55-60 min door to door, the ~37 min you see online is just the HB leg), then the panoramic Voralpen-Express over the lake dam and pre-Alps toward Arth-Goldau, and a direct train back. All seated, no booking.
🕜 ½ day♿ seated, no booking