Here’s the answer I got from Interrail customer service :
Unfortunately, you cannot travel with your France Germany Pass to a third country like Denmark or Austria. As a matter of fact, you cannot even use the Pass to cross a third country like Belgium, Italy and Switzerland.
All your journeys must be between Germany and France. You cannot also take the Thalys and Eurostar trains with your Pass. Please view this page for the valid railway company and routes you can use with your Pass.
The France Germany Pass is completely different from the Germany one country Pass on our website. Here are the differences:
- The France Germany Pass is a gift give by the French and German government and comes with different conditions as the one country Germany Pass which has to be purchased from us.
- The France Germany Pass has the outbound/inbound travel days and the one country Germany Pass does not have.
- With the France Germany Pass you cannot cross a third country with the the one country Pass you have the opportunity to visit other countries like Austria.
Please do not use your Pass to travel to any other country, or cross any third country even if the App lets you plan this journey. You will be doing so at your own risk.