Hi tlk1951! The Swiss Card can only be used for either the shortest route (mentioned by the timetable) or the cheapest one from your border/airport to your destination. In this case, that's via Bern, Spiez and Interlaken. The Golden Pass route is a more expensive detour, so the Swiss Card isn't valid there.Alternatively, you could check the Swiss Flexi Pass. This allows a couple of days of free traveling, including the first and last one of your stay, plus a 50% discount on remaining trips. Whether this is an option, depends on your further plans though.