Objective To meet the interoperability requirements between the Jiaxing section of the Shanghai-Suzhou-Jiaxing Suburban Railway and the Shanghai Demonstration Zone Line, the challenges of technical compatibility and regional coordination in vehicle selection for the Jiaxing section are addressed, with the aim of optimizing the performance of the multi-tier rail transit network in the Yangtze River Delta.

Method Based on key factors in vehicle selection （such as passenger capacity, ride comfort, and component interchangeability）, the technical suitability of city railway Type-C and Type-D trains is compared. Using measured data （noise and vibration indicators）, engineering and economic analysis （operating costs and resource sharing）, and the integration of regional standards in the Yangtze River Delta, a multi-dimensional evaluation methodology is developed to compare vehicle types for the Jiaxing section.

Result & Conclusion  Suburban railway Type-C trains outperform Type-D ones in terms of comfort, component interchangeability, and regional coordination. To achieve interoperability with Shanghai suburban railway network, facilitate the sharing of vehicle operation and maintenance resources, and enhance integrated rail transit development in the Yangtze River Delta, it is recommended that the Jiaxing section of the Shanghai-Suzhou-Jiaxing Suburban Railway adopt the city railway Type-C trains using a 25 kV AC power supply system and a target operating speed of 160 km/h.