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 bit of a technical question here: where dou you get your data for the lines from?
Is there a good source for GPX-imports or is it just manual clicking & drawing?
I'm currently trying to track my journey across Finland.
@mord0c I use this: https://signal.eu.org/osm/ That has a GEOjson export.
Railway Routing