Objective Urban rail transit operating lines in the Yangtze River Delta (hereinafter referred to as the "YRD") region frequently encounter situations occurring in winter such as overhead catenary system icing, track slippage, platform screen door freezing, auxiliary inverter and traction lock-up of trains, pantograph-catenary arcing, and short flash of turnouts, these have posed severe challenges to urban rail transit operators, necessitating a comprehensive study on the key points of winter transportation cold protection in YRD region.

Method An in-depth study is carried out on the key points in the preparation, implementation, and summary stages of winter transportation cold protection work. Taking the vehicle system risk identification of the as an example, a risk identification index system for the winter transportation cold protection of metro vehicle systems is established. On this basis, a risk assessment model revised by the LC-set valued statistics method is proposed to derive a risk identification index system for winter transportation cold protection. In terms of monitoring and early warning systems such as adding rain and snow gauges and wind speed alarms, establishing catenary icing monitoring systems, and applying turnout snow-melting devices, effective measures for winter weather monitoring and early warning are proposed. Taking specific lines of Nanjing Metro as example, emergency response and traffic organization of winter transportation and cold protection during both operational and non-operational periods are highlighted, alongside the key operational points of the cyclic track-patrol model with supplemented typical event cases.

Result & Conclusion  The revised evaluation model effectively solves issues such as evaluation indicator ambiguity, dynamic range variations, and the inconsistent expert proficiency, enhancing the credibility of sample grade evaluations. A comprehensive set of application technologies throughout the winter transportation cold protection process should be established for urban rail transit operators in the YRD region.