Assistance required - rail travel for 13 days

Hi andrelo, and welcome! Your itinerary looks fine to me. I think it's wise to concentrate on a few regions/towns and make short local trips from there. Some advice for your trips on day 5 and 10: make sure to travel from Lucerne to Wengen over the Brünig Pass route via Meiringen. And there are two ways to get from Wengen to Zermatt: one via the quick tunnel route and one over the old Lötschberg route in the mountains, crossing Kandersteg and Goppenstein. If you don't mind the extra traveling time, the second scenic route is way more spectacular. You can plan your trips using the Swiss timetable.

As for passes: either the Swiss Half Fare Card or a 4 day Swiss Flexi Pass (with free travel days on day 1, 5, 10 and 13) would fit your needs. A regular Swiss Pass would turn out to be too expensive, as you've planned many short, regional trips. A Jungfrau Railways Pass as a supplement wouldn't be cost effective, as you already profit from discounts with your Swiss Half Fare Card/Swiss Flexi Pass, aren't able to profit from all 6 free travel days this pass offers, and plan on at least one journey (to Brienz) that's outside of the Jungfrau Railway Pass's validity area.

Does this help you decide? Best regards,