Hello, I am traveling by train in the Balkans with a 15-day pass valid in all countries. It expires in early December and I still have days left to travel. I am looking to travel from Belgrade (Serbia) to Thessaloniki (Greece) by train. This train exists in real life but not in the Interrail planner. Can I add it manually? And do I need to reserve a seat on board? Or is activating my travel day sufficient?
Thank you for your help!
