I will be in Belgrade in mid July. I want to eventually make my way to Athens. I understand that the Hellas night train is not running as trains in Serbia are cancelled and there are no international border crossings in Greece.
I am happy to end up taking a bus to another city and then the train from there, and more than happy to stop at other destinations on my way to Athens. I know once I am in Greece, I can simply take a train to Athens, but its the getting to Greece that's challenging.