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1989年8月在铁科院、北大交大和呼局有关人员的共同协助下，对25米重轨在灵山至柳州间进行了长途试运，通过各项技术数据的测定，查明了6支点装载重轨车辆产生热轴和燃轴的主要原因：由于6支点装载车辆摇枕负荷不够均衡，车组连挂端即3、4支点负荷过大，跨装钢轨的车辆在通过驼峰时造成连挂端摇枕严重超载，尤其是首先通过峰顶的那辆车连挂端摇枕负荷最大值
August 1989 ASTRI, Peking University National Chiao Tung University and Hohhot relevant personnel with the help of the 25-meter heavy track in Lingshan to Liuzhou between the long-distance trial operation, through the determination of the technical data, identified 6 points The main reasons for producing hot axle and burning axle of heavy rail vehicles: Because the load of the bolster of the 6-point loading vehicle is not balanced enough, the load of the vehicle units, ie the 3 and 4 fulcrums, is too large, and the cross-rail vehicles cause even Hanging end bolster serious overloading, especially the first peak of the car linked to the end of the bolster maximum load