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1967年，因一螺栓孔裂纹扩展导致一条钢轨的角部折断，从而引发了脱轨事故，致使53人丧命。此类灾难在世界任何地方的任何铁路网中都可能发生。避免这类事故的唯一办法是在它们发生之前找出隐患并消除之。超声波探伤也许是一个解决办法。
In 1967, 53 people died in a derailment accident as a result of a bolt hole crack that caused the corner of a rail to break. Such disasters can occur in any rail network anywhere in the world. The only way to avoid such accidents is to find out and eliminate them before they happen. Ultrasonic testing may be a solution.