Review of research on railway traffic distribution
Railway network traffic distribution is widely studied in the field of railway transportation organization and is an important research topic for railway operation management.In this study,we analyze the connotation and characteristics of the optimization problem for railway network traffic distribution and review related research at home and abroad with regard to two aspects:model con-struction and algorithm design.Regarding model construction,the existing studies are classified from three perspectives—decision variables,optimization objectives,and constraints—and it is found that the decision variables are mainly set according to two basic traffic distribution models:the point-arc model and arc-road model.For large-scale traffic distribution models,the arc-road model has fewer decision variables than the point-arc model,and they are more applicable;the optimization objectives are usually set as one or more of the generalized costs,taking into account the coordina-tion of the transport efficiency and point-line capacity.Most of the models are based on traditional constraints,and the constraints are set according to different transportation needs.Regarding algo-rithm design,heuristic algorithms have become the main means of solving large-scale road network problems,while exact algorithms based on model relaxation and model decomposition as well as al-gorithms based on model modification are gradually becoming more widely used.Finally,on the ba-sis of the characteristics of existing research together with the changes in the internal and external de-velopment environment of railroad cargo transportation,the research trends in traffic flow allocation with regard to model establishment,algorithm development,and innovation are discussed.This study provides a valuable reference for railroad traffic flow allocation research.
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