Kosovo was the last of the Balkan countries that I visited. I journeyed there overland from Albania in 2017 and left by train to Skopje.
In fact the only train running in the fledgling nation is from Pristina that goes close to the border with North Macedonia.
Here are some photos from that journey.
You can read about this journey and all my train journeys in all the other Balkan countries in my book Travelling By Train Across The Balkans that is available from Amazon.