 A number of locomotives have been modernised to Class 46, initially 3 units by Končar Group, and later by PROMAT and Softronic Craiova.Class 46 is also a number used by Class 43/44 locomotives that were reclassified after being renumbered into UIC system, though with no modernisation what so ever.The Class 44 (040-EC1) is the same as Class 43, but modified for higher speeds (160 km/h).