Asynchronous traction motor was developed for dualvoltage electric locomotive on narrow gauge track. The gauge of the narrow gauge locomotive was smaller than the standard gauge, which resulted in the abnormally small installation space of the traction motor. The requirements for installation space, motor structure and electromagnetic load were more difficult compared to those of other traction motors. The application characteristics and special requirements of dualvoltage narrow gauge electric locomotive were analyzed. The design requirements and key technical difficulties of traction motor were put forward. The manufacturing process and the testing process of the dualvoltage traction motor were described. The test results show that the traction motor successfully meets all design requirements.