While the Swiss Travel Pass covers an extensive range of transportation options within Switzerland, there are certain services that are not included in its coverage. For instance, mountain excursions to Jungfraujoch or Schilthorn may require additional fees on top of the pass. Similarly, some private mountain railways and cable cars are not part of the Swiss Travel Pass benefits. Additionally, reservations for scenic train journeys like the Glacier Express or Bernina Express may need to be made separately and might incur extra costs even if you have a Swiss Travel Pass.