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The most powerful worldwide, 4ES5K freight AC electric locomotive Ermak has an unprecedented power of 13120 kW (in an hourly mode) enabling driving of heavy-duty trains of up to 7,100 tons weight in complicated landscape conditions. Its design applies a new technical solution: axle-based traction control system enabling to appropriately allocate the traction load between axles and realize electric loco thrust coefficient at maximum, i.e. to increase the weight of goods carried.