Right then

The serious planning for #CrossBorderRail South East Europe has to start with *what rail borders* do I want to investigate

These are all now as pins in the map
https://umap.openstreetmap.fr/en/map/crossborderrail-south-east-europe_991708#7/43.619/20.660

The emphasis: ALL the places where lines exist between non-EU countries in SE Europe, external borders of the EU, and a couple of Croatian borders I am missing

Dark blue: must visit
Light blue: either have visited before and don't need re-checking, or are insignificant but could be added

#CrossBorderRail South East Europe - uMap

uMap lets you create maps with OpenStreetMap layers in a minute and embed them in your site.

@jon Anything interesting between Greece, Bulgaria, and Romania?

(Coming to think of it, do any of these countries even have good intra-member state rail?)

@Alon Checked all those in summer 2022. So no need to go there again :-)

Kulata-Thessaloniki is in a bad state, works for freight. Ormenio-Svilengrad is not in a poor state, but no one wants to do anything with it.

RO-BG has 2 lines (at Vidin-Calafat, and Ruse-Giurgiu) and both are shockingly bad Romanian side, but I have already been to both.

@jon
You could check out the possibilities of another bridge across the Danube at Turnu Magurele? It seems the more obvious Sofia-Bucharest corridor. And it's an excuse to travel the Iskar Gorge.
@Alon