The E5K and ES5K are a family of Russian mainline freight AC electric locomotives with a voltage of 25 kV, featuring four-axle units equipped with collector traction motors. Different versions: E5K, 2ES5K, 3ES5K, 4ES5K — are distinguished by the number of units according to the prefix. These locomotives are the next evolutionary step in the development of the VL80 family of freight electric locomotives and are positioned as their main replacement.