Applies to convertor-fed alternating current motors forming part of the equipment of electrically propelled rail and road vehicles.The object of this part is to enable the performance of a motor to be confirmed by tests and to provide a basis for assessment of its suitability for a specified duty and for comparison with other motors.Where further testing is to be undertaken in accordance with IEC 61377, it may be preferable, to avoid duplication, that some type and investigation tests be carried out on the combined test bed.