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For info: this track is SE of Zagreb, en route towards Belgrade, openrailwaymap shows it was rather slow. Maybe they are concerned that the new fast line from Budapest - Belgrade competes with their route Salzburg - Ljubljana - Zagreb - Belgrade, to be the main line from Germany to Turkey.
As someone interested in getting as close as possible to Bulgaria by train from the rest of Europe, this all sounds like good news to me. I’m more hopeful in the Croatian route though - for whatever reason, I expect less collapses there.