2 years. Aochi A1 is a freight car developed by Wuzheng Group. The car is equipped with electric doors and windows, air conditioner, dryer, second-class chassis, fairing, sabs, Wuzheng trademark and UFO trademark to improve the performance of the car. Through finite element analysis, the bearing capacity of the whole car is stronger and the service life of the frame is improved. According to the inquiry of Wuzheng Group, the warranty period of the car is two years, and the car will reappear only after two years.