Most tickets are valid for 24 hours, so you can take a train at any time on the route you purchased within that window, or hop on/off as you like on that route. BUT, note that return tickets follow the same rules, so if you're not returning on the same day, you should buy two one-way tickets (it's the same price) vs.

Yes, you can "hop on and off" the Golden Pass train route in Switzerland, but it requires careful planning regarding seat reservations. The Golden Pass is not a single train but a route consisting of several connecting services, most notably the GoldenPass Express (Montreux to Interlaken) and the Lucerne-Interlaken Express. If you have a Swiss Travel Pass, the journey is technically "free," and you can disembark at any station (like Gstaad or Spiez) to explore and then board a later train. However, the high-demand panoramic trains—especially in Prestige or First Class—require a compulsory seat reservation (approx. CHF 20–49). If you hop off, your reservation for that specific seat on that specific train is lost, and you would need to purchase a new reservation for the next leg of your journey if you want a guaranteed seat in a panoramic car. For maximum flexibility in 2026, travelers often take the standard regional trains that run the same tracks, which don't require reservations and allow for true hop-on-hop-off freedom.