Yong(Yongji electric Machine Factory of CNR) is a specialized large enterprise engaged in developing and manufacturing various types of motors, electric control devices, and electro/electronic elements used in the fields of railroad vehicles, oil drilling machine, wind power generation and metallurgical machinery etc. The factory has also set up a postdoctoral station for research and development. As the largest manufacturer of locomotive electric transmission in China .the factory has equipped more than 95% different types of diesel locomotive with electric transmission equipment during the four times of speed-increasing in China railways. Yongji Electric Machine Factory has equipped about 70% of the total amount of domestic diesel-electric locomotives and about 30% of electric locomotives with its products. Complete sets of electric machines and electric control devices can be provided for different types of diesel-electric locomotives. The factory is also in the position to supply traction motors and converters for electric locomotives ranging from SS3 to SS9. Based on the special technology of electric transmission, the factory has become the principal supplier of drilling motors and alternators for oil drilling and wind generation in China. The factory is the first one in the same trade to be certified in conformity with the ISO9001 quality system, ISO14001 environmental system and OSHMS system. Its products have been exported to more than ten countries and regions like USA, Canada, and Switzerland. All these stem from our perception to the future and the special technology in our hands, from our new and effective products and network service system. It is the system that to a great extent guarantees our customer to compete in the market. Our factory insists on combining self-development with imported technique and has introduced manufacturing technology of electric machine and elec