Study on Influence of High-speed Railway on Section Carrying Capacity of Existing Line

After opening and operation of high-speed railways, the passenger trains of relative parallel existing lines were shunted, and the structure of train diagram was changed, which influencing the section carrying capacity of existing line and releasing the carrying capacity for freight transportation. By using direct calculation method, this paper takes quantitive analysis on the changes of parameters such as the interval time of train tracing, the differences of sectional operation time between different types of trains and the proportion of train dispatching in succession, which bring influences on section carrying capacity of existing line; through comprehensive use of deduction coefficient method and direct calculation method, taking Beijing-Shijiazhuang-Zhengzhou section of Beijing-Guangzhou high-speed railway as example, and based on comparative analysis on passenger train number before and after opening of high-speed railways, the paper takes quantitive calculation on releasing volume of carrying capacity for freight transportation on existing Beijing-Guangzhou line.