The dual operation of horse and steam traction proved to be unreliable by that time.
In 1964, the fast line to the Eastern Slovak IronWorks (now U. S. Steel Košice) was put into operation with a length of 13 km.
Since 1979 until newer rolling stock entered the network, three-car T3 sets have been operated on the high-speed line which was unique to the territory of Czechoslovakia.
In April 2011, the first units of low-floor Vario LF trams were delivered to Košice.
[5] In 2014, Košice received investment from the EU Cohesion Fund for modernization of its network.