**6. Patents**

Implementation of the present study was financially supported by the Ministry of Education and Science of Ukraine under the framework of the R&D project 'Improvement of energy efficiency of the railway rolling stocks on the basis of the resource-saving technologies and intelligent power systems' (state registration number 0120U101912).

**Author Contributions:** Conceptualization, methodology, and investigation S.G., V.T., S.S. and B.L.; investigation, writing—review and editing, S.G., V.L. and R.K.; formal analysis, writing—review and editing, R.M. and A.K.; investigation, S.G., V.T., S.S. and B.L. All authors have read and agreed to the published version of the manuscript.

**Funding:** This publication was realized with the support of Operational Program Integrated Infrastructure 2014–2020 of the project: Innovative Solutions for Propulsion, Power, and Safety Components of Transport Vehicles, code ITMS 313011V334, co-financed by the European Regional Development Fund.

**Institutional Review Board Statement:** Not applicable.

**Informed Consent Statement:** Not applicable.

**Data Availability Statement:** Not applicable.

**Conflicts of Interest:** The authors declare no conflict of interest.
