Budapest–Belgrade railway
The Budapest–Belgrade railway connects the capital cities of Budapest, Hungary and Belgrade, Serbia, linking the Budapest Keleti railway station with Belgrade Centre railway station. Valued at $2.89 billion, the 350 km (220 mi) high-speed rail line is part of the planned Budapest–Belgrade–Skopje–Athens railway, an international route across Central and Southeast Europe.
Source: Wikipedia — Budapest–Belgrade railway (CC BY-SA 4.0)