Hi yc2012. No, there's no further discount for pass holders. Actually the Good Morning or Good Afternoon ticket is meant for non-passholders. Buying a regular 50% discounted ticket with your Swiss Half Fare Card is the cheapst option for you.
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Swiss Travel Pass promotion 25% discountOnly if purchased in July 2021. Free cancellation.Buy via the SBB travel centre at https://shop.switzerlandtravelcentre.com or HappyRail at https://www.happyrail.com/swiss-travel-pass.