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The 3ES5K main line freight electric AC locomotive is designed to haul freight trains on 1520 gauge railways. The three-unit 3ES5K electric locomotive consists of two leading (trailing) units and a booster unit, which is produced without a driver's cab.

The booster unit has a set of equipment, which provides electric locomotive's operation in traction and regenerative braking modes, controlled by a single locomotive crew from a driver's cabin in the leading or trailing unit.

The electric locomotive has a gangway from the driver's cab of the leading unit to the driver's cab of the trailing unit via the booster unit.

The 3ES5K electric locomotives are operated by the Eastern Siberian and Far Eastern Railways Branches of the Russian Railways JSC and the Odessa Railways (Ukraine).