A drive system for a vehicle includes two electrical machines arranged between a combustion engine and an input shaft to a gearbox. The first electrical machine rotor is connected with a planetary gear component, and the input shaft of the gearbox is connected with another planetary gear component. The second electrical machine rotor is connected via a transmission with the output shaft of the combustion engine, which is connected with another planetary gear component. planetary gear's components may be locked together to rotate at the same rotational speed, and released wherein the components rotate at different rotational speeds. Further, the output shaft of the combustion engine may either be locked in position with or released from the additional planetary gear component.