Abstract: ［Objective］ Currently, the design speed of articulated LRV (light rail vehicle) is 100 km/h, which somewhat restricts the expansion of light rail lines to the suburbs, satellite cities, and other areas. Therefore, it is necessary to conduct in-depth research on key technologies for 120 km/h articulated LRV transit, including designs for the overall train, bogie and articulation devices. ［Method］ Based on the conditions and characteristics of LRV lines and the vehicle technical parameters, the boundary conditions for the overall design of 120 km/h LRV are determined. An overall design scheme for the 120 km/h articulated LRV is proposed, and the main train technical parameters are established. Through theoretical analysis, simulation modeling, and bench tests, precise dynamic parameters are obtained. Comprehensive analysis and evaluation are performed on the structural strength of the articulation devices, the bogie frame strength, and the dynamic responses of the vehicle system. ［Result & Conclusion］ The overall design scheme, bogie design scheme, and vehicle-end connection design scheme for this type of articulated train can effectively optimize the relationship between the bogie suspension system and the wheel-rail interaction, improve the train capability to negotiate curved sections, and enhance operational stability and safety.