平庄矿务局铁路运输部机车检修段对本局西露天煤矿JS5758号蒸汽机车进行架修分解时，发现该机牵引杆后销断裂，托板螺栓松动，致使后销在机车运行中形成上下摆动。若机车继续运行，托板螺栓势必在销子重量作用下“捋扣”失效，使机车与煤水车在列车运行中突然分离，最终导致重 Pingzhuang Mines Bureau of Railways locomotive repair section of the West Wing open pit JS5758 coal steam locomotive rack repair decomposition, it was found after the traction rod rupture, pallet bolts loose, resulting in sales in the locomotive running in the formation of the upper and lower swing . If the locomotive continues to run, the pallet bolt will inevitably lose its “buckle” under the weight of the pin, causing the locomotive and the coal-water truck to suddenly break away from each other during the train operation,