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In order to improve the accuracy of emergency consequence severity assessment，clarify the correlation between the risk causes and consequence severity in urban traffic emergencies，the improved discrimination model of emergency consequence severity (IDM-ECS) was constructed and experimentally verified. First，based on the IFSA，the risk causes of emergencies were screened to obtain the important risk causes such as train fulfillment rate，punctuality rate，and daily network passenger volume and so on. Secondly，the improved hybrid restricted Boltzmann machine(HRBM) model was used to calculate the relationship between different risk causes and the consequence severity，and the discriminative relationship between risk causes and the consequence severity was obtained by comparing the probability values. Finally，the dataset of rail transit emergencies was used as an experimental sample for validation. The performance was compared with four models，including Generating Restricted Boltzmann Machines (GRBM)，Random Forest (RF)，Deep Forest (DF)，and Light Gradient Boosting Machine (LightGBM)，in terms of recall，precision，and F1 value. The results show that train fulfillment rate，punctuality rate，daily network passenger volume，line 5 section full load rate，line 10 section full load rate，signal failure，and vehicle failure are the seven optimal risk causes. The IDM-ECS model has an average recall of 90.55%，precision of 91.89%，and F1 value of 91.06%，all of which are better than those of the comparison models.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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