Research Article
Evaluating Railway Operation Safety Situation in China Based on an Improved TOPSIS Method: A Regional Perspective
Table 3
Names, symbols, quantification methods, and units for all situation indicators.
| Indicator | Symbol | Quantification method | Unit |
| Number of accidents | | | — | Number of accidents per unit turnover | | | —/hundred million ton-kilometers | Accident grades | | | — | Structure of accident properties | | | — | Degree of accident correlation | | | — | The average recovery time of accidents | | | Hour |
|
|