Uzhhorod–Košice broad-gauge track

The Uzhhorod–Košice broad-gauge line is a single-track 1,520 mm (4 ft 11+27⁄32 in) gauge railway mostly in eastern Slovakia, which is used especially for transporting iron ore from Ukraine to the steel works near Košice. In the 1960s, after construction of the steel works in Košice, imports of iron ore to Slovakia rose steeply, and the checkpoint in Čierna nad Tisou could not handle this volume, particularly in winter, as Czechoslovakia and the Soviet Union had different gauges and all freight had to be transshipped.

Source: Wikipedia — Uzhhorod–Košice broad-gauge track (CC BY-SA 4.0)