I think there might be more immediate problems, though not for me. We've reached the border station for Croatia, and a full passport check is in progress on the train. Several non-EU citizens appear not to have visas for Croatia, presumably having not realised that it's not in the Schengen zone, and the Croatian police are not letting them in to the country. There's also a Hungarian soldier with a gun keeping an eye on proceedings, though I assume he's there to keep undesirables out of Hungary, rather than in.