Thank you ZoeS for your prompt. You are right. I’m referring to Swiss Travel Pass. From the validity map, I cannot find that there is discount for the train route from Feldkirch to Buchs. If I ride on the direct EC train from Feldkirch to Zurich, I could either -
(a) buy a ticket from Feldkirch to Buchs at full fare, and hold the Swiss Travel Pass to continue the journey from Buchs to Zurich; or
(b) buy a ticket from Feldkirch to Zurich at discount rate (because I’m holding Swiss Travel Pass?) by choosing GA ticket? Btw, I’m not sure if GA discount is the same as Swiss Travel Pass.
Secondly, may I further enquire the route from Geneva train station to Annemasse. As I see from the Swiss Travel Pass validity map, the said route is in dotted line. Does it mean I can buy the ticket at 50% reduction rate on SBB? If so, how can I enjoy the discount as I cannot find any discount option for “Swiss Travel Pass” on the SBB app?