I checked the SBB website for a ticket from Zürich Technopark station to Lauterbrunnen. There was an option to upgrade to a City Ticket. What I don’t understand is:
Between Technopark and Lauterbrunnen, there are transfer stations like Bern and Interlaken Ost. With the City Ticket upgrade, can I freely explore Bern and Interlaken Ost within the validity period?
For example, if my train stops at Bern, can I get off, explore the city, then later take another train to Interlaken Ost, explore there, and finally continue to Lauterbrunnen?