我国铁路实行新运行图后，装用２０２型转向架的车辆反映出垂向振动大、侧滚振动严重、脱轨系数超标、磨耗严重、故障率显著上升等问题。为此，铁道部决定对该型转向架实施七项改进措施，使之适应提速要求。首辆补强改造试验车已通过车辆动力学试验，１９９７年７月２８日完成了图纸定型工作 After the implementation of the new railway map of our country, the vehicles equipped with 202 bogies reflected the problems of large vertical vibration, severe side roll vibration, excessive derailment coefficient, serious abrasion and significant increase in failure rate. To this end, the Ministry of Railways decided to implement seven improvements on the bogie to adapt it to speed requirements. The first retrofit test vehicle has passed the vehicle dynamics test, July 28, 1997 completed the work of drawing stereotypes