I've traveled by train in other countries, but I find Switzerland confusing.
I'll be on the RS Switzerland tour later this month, and will use trains for 3 trips before and after the tour. The trips don't add up to enough to make a half-price card useful. So that part is solved.
Am I understanding correctly that a regular price ticket can be used on any train on the route that day? So if my flight is delayed, I can use a ticket from Zurich airport to Luzern later in the day?