Košice–Vienna broad-gauge line
The Košice–Vienna broad-gauge line (Slovak: Široká koľaj do Viedne, German: Breitspurstrecke Košice–Wien) was a proposal to extend the 1,520 mm (4 ft 11+27⁄32 in) Russian gauge (broad-gauge) railway line from the city of Košice in eastern Slovakia to Vienna and Bratislava. It would have created an 8,000-kilometre (5,000-mile) rail transport corridor linking Western Europe and China.
Source: Wikipedia — Košice–Vienna broad-gauge line (CC BY-SA 4.0)