Interesting fact, there were two base variants of such modernization. The one by Russian transport scientific-industrial complex and the one by... General Electric. There were certain comparative tests by the results of which was made a conclusion that Russian project is noticeably better by the price/quality ratio. Also it was stated that 5D49 has less fuel and oil consumption than GE 7FDL diesel. However GE project was liked by KTZh (Kazakhstan railways, do not confuse with KTZ, Kolomenskiy diesel locomotive plant or Kolomna diesel works, the manufacturer of D49 series) and https://en.wikipedia.org/wiki/Yakutian_Railway so some of their 2TE10Ms were modernized by GE. By the way, the prototype of such modernization was remotorized with its own body and got fridge section only on one side (google 2TE10M-0881) but serial variants (2TE10MK-KN for KTZh and 2TE10MPGE for Yakutian Railway, maybe there are other differences than just name, however unsure) get Super Skid power modules.