# Research on the Causes and Transmission Mechanisms of Railway Engineering Safety Risks
## 4 Data Processing and Data Table Construction
### Data Table Construction of Railway Engineering Safety Risk Causes  
For the convenience of subsequent analysis, we represent the processed raw data in the form of a data table. The specific manifestation of risk causes (B1-B66) was used as a conditional attribute, and the accident level was regarded as a decision-making attribute. The attribute value corresponding to the specific manifestation of risk causes that appeared in each case was set to one, and the attribute value corresponding to the specific manifestation of risk causes that did not appear in any case was set to zero. The decision attribute values of each case corresponded to its accident level. The smaller the value of the decision attribute, the higher the accident level and the greater the consequences. The specific corresponding rules were as follows: the decision attribute value corresponding to a particularly serious accident (T1) was one, the decision attribute value corresponding to a major accident (T2) was two, the decision attribute value corresponding to a major accident (T3) was three, and the decision attribute value corresponding to a general Class A accident (T4) was four. Further, the decision attribute value corresponding to a Class B accident (T5) was five, the decision attribute value corresponding to a Class C accident (T6) was 6, and  
\begin{table}
\begin{tabular}{p{113.8 pt} p{113.8 pt} p{113.8 pt} p{113.8 pt}} \hline \hline
**Accident Case Number and Description** & **Risk Causal Responsibility Object** & **Specific Manifestations of Risk Causes** & **Accident Level** \\ \hline \hline \multicolumn{4}{p{113.8 pt}}{(1) The cutting slope in this area was steep, with sandstone on the slope surface and severely weathered and developed cracks. The weathered soil contained a large number of partially weathered large stones} & (1) Environmental risk causes & (1) Poor natural environment foundation near a rail line (B44) \\ \hline \multicolumn{4}{p{113.8 pt}}{(2) From October 27 to 29, there were a total of seven earthquakes with a magnitude of 2.0 or higher, with a maximum magnitude of 3.4} & (2) Environmental risk causes & (2) Earthquake (B41) \\ \hline \multicolumn{4}{p{113.8 pt}}{(3) Since October 24, the region has experienced continuous rainfall of 178.8 mm, causing saturation of the slope soil with water content} & (3) Environmental risk causes & (3) Thunder, heavy rain, and rainstorm (B36) \\ \hline \multicolumn{4}{p{113.8 pt}}{(4) During the construction of the denifiment accident of the 40980 freight train on the 40984 Line on the structural deficiencies} & (4) Parulina the standard level of equipment for lines, bridges, and roads was relatively low, which resulted in congenital structural deficiencies & (4) Facilities and equipment risk causes & (4) The construction quality of track line facilities and equipment is low, and the basic condition is poor (B12) & General Class B accidents (T5) \\ \hline \multicolumn{4}{p{113.8 pt}}{(5) The technical and safety management capabilities of Yunnan Railway Construction Engineering Company, which is an equipment maintenance agency, require further improvement} & (5) Management risk causes & (5) Inadequate professional technical management in the construction and usage of facilities and equipment, fault handling, and accident rescue (B60) \\ \hline \multicolumn{4}{p{113.8 pt}}{(6) The Guangdong Engineering Section has promptly issued a notice requiring the maintenance unit to conduct inspections on the line, bridge, and road equipment, but the supervision and implementation of the equipment maintenance unit are not in place} & (6) Personnel risk causes & (6) Inadequate supervision and management by responsible internal railway personnel and regulatory units (B4) \\ \hline \hline \end{tabular}
\end{table}
Table 1: _Cont._the decision attribute value corresponding to a Class D accident (T\({}_{7}\)) was seven. The final data table of the railway engineering safety accidents is shown in Table 2.