To demonstrate the necessity and rationality of interconnecting Chongqing rail transit lines between core hubs based on the concept of urban rail transit interconnection, this study summarizes the macro positioning of planning fit, improving service quality, guiding urban development, and implementing resourcesharing using the example of Chongqing rail transit lines 26 and 27. It also analyzes the economic benefits, operating losses, and civil investment increases caused by the interconnection mode. With the effect of the time value, the converted net present was used as the measurement index of the necessity and rationality of the interconnection to exhibit rail transit lines 26 and 27 between the core hubs. The results demonstrate that the converted net present value of the interconnection with Chongqing rail transit lines 26 and 27 between the core hubs is greater than zero. The necessity for interconnection is significant, and the scheme is reasonable and should be recommended. Considering the necessity of urban rail transit interconnections, this study proposes an analytical framework that combines qualitative and quantitative analyses, enhances the research system of urban rail transit interconnections, and provides an effective reference for the planning and design of similar projects.

urban rail transit  /  interconnection  /  time value  /  converted net present  /  core hub