After the roll-out of 753 601-603 in 2012 and 753 604 in 2013, which are all in service for SD-KD now, it became quiet for a few years. This changed with the delivery of 753 605 to SD-KD in August 2017 and now the story continues with locomotive 753 606. On 12 October, it was seen on test in the colors of Unipetrol Doprava. It has been indicated that the operator will receive two of the type and that it has options for another two locomotives. The second locomotive will be delivered before the end of 2017.