The Uzhhorod–Košice broad-gauge line is a single-track 1,520-mm-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. It was thus decided to build a Russian gauge line in Czechoslovakia to ease the bottleneck. Construction started on 4 November 1965, and the line opened on 1 May 1966. It was electrified in 1978.

Trains are hauled by two electric twin-unit locomotives, similar to the late versions of PKP's ET40 but with SA3 couplers instead of buffers and chain couplings, except of westbound between Trebišov and Ruskov where the gradient is over 15 ‰ and two sets of locos are needed. The train weights are up to 4,200 tonnes. This stretch has the heaviest catenary construction in the EU (2 work cables, 1 fitting cable and 3 additional cables).

This line is for freight only, but there are some diesel motor cars for railway personnel.