| Main category | Subcategory | Frequency (times/year) | Average processing time (min) | Proportion (%) |
| Train factors | Train failure, door, auxiliary control circuit, control circuit, brake, main circuit | 127 | 17.6 | 30.75 | Communication signal factor | ATS, vehicle ATC, trackside equipment, communication, signal, etc. | 184 | 18.2 | 44.55 | Power supply factors | Substation, touch network, power supply, etc. | 8 | 23.4 | 1.94 | Public works factors | Turnouts, lines | 22 | 7.6 | 5.33 | Passenger transportation factors | Screen door/safety door, driver delay, passenger transportation, and others | 14 | 14.3 | 3.39 | Objective factors | Passengers, people and objects, intrusion limits, large passenger flow, personnel invasion, human-train conflict, objectives, and others | 58 | 3.3 | 14.04 |
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