The paper presents modernization of the TEM2 locomotive bogies with a view to adapt the present construction to higher requirements related to environmental protection. Modernization of the bogies is caused by modernization of the TEM2 locomotive itself. In consequence, a 19D locomotive is designed, that shall fulfill the requirements of relevant technical specifications for interoperability (TSI). Advisability of the bogie modernization is highlighted with consideration of environmental protection requirements. The goal was supported by the examples of other modernization tasks carried out to date in the Institute of Rail Vehicles “Tabor”. The design changes of the bogie subassemblies are presented, that are conducive directly to reduction of environmental pollution during the vehicle operation. The paper was prepared within the framework of the Applied Research Program 3 No PBS3/B6/33/2015 entitled “Series of modernized six-axis diesel locomotives meeting the requirements of European Union, making use of the locomotives in operation in Poland” implemented by the Institute of Rail Vehicles “Tabor” in Poznań and the Rail Vehicles “PESA” Bydgoszcz JSC.