Hi, I’m planning a trip starting in Greece and ending with a few places in Italy, but on the rail planner app when I search for trains every single one (in Italy) says a seat reservation is required from €10? Is this true or can I ignore it? How do I know what kind of train it is, the only info is a code such as ‘FR 9437’?
Also, do you have to book these trains in advance or can you just show up on the day?
Finally, is there a way to use my Interrail pass to get from Athens to Thessaloniki using one travel day?
Thank you so much!