Research About Operation Plan For Time-bound Freight Trains

In the context of the optimization and adjustment of the national industrial structure,the demand structure of the domestic freight market is undergoing profound changes.The demand for commodities transportation continues to decline while the demand for bulk cargoes transportation is on the rise.For example,the demand for high-speed transport,represented by e-commerce,has exploded.In order to adapt to the market changes,the railway transport enterprises have successively launched such new types of transport products as express trains and high-speed rail express services.However,they have not yet formed a strong competitive edge in the express freight market.At present,China Railway Express has a very low market share,so it is necessary to develop a new type of railway transportation products to meet the highspeed demand of the freight market transport needs.First of all,this paper discusses the necessity of railway developing time-bound express enterprises by combining with the status quo of the development of the railway service.The definition of the express time-limited railway organization and its connotation are given based on the preliminary definition of time-limited express transportation market.According to the actual conditions of the general railway,the feasibility of carrying out the express time-bound operation on the general railway is analyzed from the aspects of economy,technology and policy.Then,based on the analysis of the main characteristics,classification,time standard and the railway condition of the time-bound freight trains,this paper gives the preparation process of the time-bound freight trains operation plan;Then use the multi-factor cluster analysis method to classify the first and second node cities,combined with the railway physical network,to build the railway the time-bound express service network;The parameters of the time-bound freight trains,such as the open path and the number of groups as well as the frequency,was split and optimized,the best path was determine by the shortest path algorithm,the minimum total cost of the project is taken as the objective function,a nonlinear mixed integer programming model is constructed to solve the problem that the frequency and quantity of the time-bound freight trains are limited each other and the feasible solution method is given.Finally,a simple example is designed and solved in Lingo,and the optimal operation plan is evaluated.All the four indexes are excellent,which verifies the feasibility of the time-bound freight trains optimization model.