Hello - I have 3 days in Lucerne in April and one of the trips I’d like to do is from Lucerne to Interlaken. I’ve seen lots of comments about not needing to reserve trains in Switzerland but thought I’d check it out. I’ve had a look on OBB and SBB and Rail Europe and can’t find any reservations available. It seems possible on the Eurail site itself. The only other place I can see to purchase them is at https://store.luzern.com/luzern_en/specials/daytrips/zentralbahn-int-lu   

I’ve looked on there for 24th April and the seating plan shows quite a lot of seats are already booked so it seems as though it might be a good idea to book after all? Or could it be that only some seats are able to be reserved and the rest are left for people to hop on/hop off? Has anyone booked reservations via this shop? Many thanks for advice