I am considering buying an Interrail pass but I have a specific journey planned out. Is it possible to know whether there are pass holder seats left on specific journeys before I buy the Interrail pass? I am thinking specifically about Eurostar London to Paris, but also Paris to Munich, and Grenoble to Paris.
If it’s not possible to know that before paying for the pass - I think that you can only get 85% back on unused passes, have I read that correctly?
Thank you for your help!