There we go again-uyes, you have found it right=nearly. NO trains overboder between the now now old parts of Yugoslavija (except HR-SI=Hrvatska-Slovenija) and Serbije-Ce=rna Gora (montagnes noirs).

Thus this is not 1st stumble-also again Serbije-Maced and also Maced-GR and also NOne BG-GR.

Best site to guide you if stubbornly wanting to use trains amap: seat61.com

Sensible people simply book a bus through without these cumbersome hassles of using taxi or short bus in between forgotten railends.

You can go further and by train-if really wanted-via HU-RO-BG and till as far as GR border. BG also has famous beaches aiming young+drunk bekpekkers, but no islands. And very cheap flites back to this hexagone on WIZZair.