Hey David,
Absolutely no issues with the trains in Switzerland, powdair have only been targeting the inbound UK to launch to date it seems, but the amount of locals that are super excited especially for short stays outbound to EDI seems to be going viral here. They all want whiskey tours....
With any airline schedule the magic sauce sits in the frequency and timings - it certainly seems in talking to powdair when I've wondered over the other side to the terminal and talking to some influencers here in Sion that there is a slightly bigger picture than what I think is visible in public domain right now.
Rumours here that they signed a new hire on Friday that I think will improve their chances if its true! Its certainly the talk of the town here so will be an interesting one to watch for sure.
I will caveat everything I am saying mind you with the normal tunes etc, as our flight office is the other side of the airport on the TAG side