Good afternoon! Me and my friends are planning a trip from Amsterdam to Thessaloniki for the coming April. We wanted to travel via Munich, Budapest and Belgrade. Up until Budapest, we can plan our trip via this website. However, when we want to check for trains from Budapest to either Belgrade or Thessaloniki, nothing comes up on the travel planner.
Neither do I see Serbia in the list of exceptions on the website.
I was therefore wondering whether there is any reason why we cannot find trains (in April) from Budapest to either Belgrade or Thessaloniki.
Thank you in advance.