Authorities have not yet disclosed the results of an investigation into the cause of that accident, though state media cited officials saying signaling equipment was thought to have been a key factor.
目前官方尚未公布此次事故的调查结果，但媒体报道引用官方说法是信号灯故障是造成事故的关键因素。
Muhlbauer risk assessment scoring system of pipeline, and also describes in detail modeling chart of risk assessment and 4 factor to cause accident, as well as put forward classific.
Muhlbauer的管道风险评分体系，详细阐述了风险评价模型框图和引起事故的4个因素，提出了风险等级划分标准和减小管道风险的一些建议。
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