To achieve the rational transportation of complex car flows within the railway district, the cooperative organization relationships and mutual influences among multi-type trains are first analyzed combining with the composition of car flows within the district. Second, a 0-1 integer nonlinear programming model is constructed by considering the matching relationship between trains and car flows within the district and the characteristics of loaded and empty car flows. Aiming at minimizing train operation cost, number of stops, stopping cost, and car accumulation cost while maximizing transportation benefits, constraints such as train traction weight and converted length within the district are considered. Then, linearization techniques are used to handle the nonlinear terms in the model, so that the solution can be directly obtained by commercial optimization software. Finally, a case study is constructed based on the downward direction of a double-track railway district, and the optimization effect of the model is verified by comparing the optimized operation plan with the existing plan. The results show that the optimized plan reduces the number of stops by 3 and decreases stop consumption by 67.2 car-hours. Without operating district trains, the model can effectively reduce stopping operations and car-hour consumption through reasonably organizing the operation of pick-up and drop trains and key pick-up and drop trains, providing a reference for optimizing car flow organization plans within the railway district.
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