Abstract: Objective: Experiences for installing traction catenary for 160 km/h speed level city (suburban) railway tunnel interval are insufficient. It is necessary to carry out emphasized research on traction catenary type selection and composition parts, design requirements and construction precision requirements, so that city (suburban) railway power supply traction technology is optimized and improved. Method: The current application status of catenary systems for urban rail transit lines and city (suburban) railway lines at different speed levels in China is statistically analyzed. It is recommended that the 160 km/h speed level city (suburban) railway adopts an OCS (overhead catenary system) with AC (alternating current) power supply. Based on factors such as tunnel sections, aerodynamic effects, and construction costs, as well as the construction and operation experiences of urban rail transit and city (suburban) railway lines in China, it is further proposed to use a cantilever rigid suspension OCS with AC 25 kV power supply for the above 160 km/h tunnel intervals. Subsequently, the composition and design requirements of the main components such as the support devices, busbar assemblies, and expansion joints of the power supply cantilever rigid suspension OCS are expounded.Result & Conclusion: Upon fulfilling the requirements of dynamic performance indicators for the interaction between the pantograph and catenary at the speed of 160 km/h, the main design technical standards and construction precision requirements for cantilever rigid suspension are proposed to ensure good current collection performance between the pantograph and the catenary.