The Danube flows through 4 capital European capital cities: Budapest, Vienna, Belgrade and which other?
Danube suffix "-ouwe" "wetland". The modern languages spoken in the Danube basin all use names related to "Dānuvius": (); (); , (); Classified as an international waterway, it originates in the town of Donaueschingen, in the Black Forest of Germany, at the confluence of the rivers Brigach and Breg. The Danube then flows southeast for about , passing through four capital cities (Vienna, Bratislava, Budapest and Belgrade) before emptying into the Black Sea via the Danube Delta in Romania and Ukraine. Once a long-standing frontier of the Roman Empire, the river passes through or touches the borders of 10 countries: Romania
Budapest–Belgrade railway International, financed with Russian credit. The reconstruction of the section Novi Sad-Subotica is set to begin in 2019, with estimated cost of €943 million, built by a Chinese company and a duration of 33 months, during which this section will be closed. The railway line between Budapest and Belgrade was used also by the Orient Express until 1914. The Orient Express was launched on 5 June 1883. It connected Paris and Constantinople. Budapest–Belgrade railway The Budapest–Belgrade railway connects the capital cities of Hungary and Serbia – the Budapest Keleti railway station with the new Belgrade Centre railway station. As a