Hello! We’re visiting Switzerland this summer from the US and have purchased Swiss Travel Passes (we have 3 adults, one 16-year-old and one 13-year-old. I understand that reservations are optional for regular trains, but required for the scenic trains, which we want to do one day. Does anyone know how/where to book those scenic trains? The chat bot tells me sbb.ch/en/scenictravel but that gives me an error. Do those trains appear on the regular timetables at all?