Clarification on Swiss Flexi Pass and lockers

Hi there,

I really did try to read through the topics on the Passes for about 10 pages but didn't see my topic addressed. Please forgive if this is covered elsewhere!

I understand that on a consecutive Swiss Pass you can hop on and off intraday with unlimited access. Does the Swiss Flexi Pass also allow more than one train ride per day if that day is designated as a free travel day, or are specific connections only counted? (Namely, we are debating whether we can go from Interlaken, stop in Bern for an afternoon, then go on to Zurich and have both train trips covered by the Flexi Pass that day).

If this does work, we'd like to know if there are lockers available in the stations at Montreux, Bern and Lugano. There probably are but I figured it'd be a good idea to check.

Lastly, we would like to take the Golden Pass and Wilhelm Tell Express during our trip. I've read on this site about how you must make reservations on these, but I was wondering if you have to pay for the reservations in addition to the cost of the Flexi Pass. If so, how much do they usually run you? Is there a marked difference between the panorama cars and the regular trains (i.e., a different route or significantly worse visibility)?

Thanks so much for being such a great resource to travelers in Switzerland!
Renee

Thanks so much Arno, this was really helpful!