Study on the Optimization Model of Car Flow Organization in the Loading Area of Heavy Haul Railway Based on the Combined Trains

According to the characteristics of the car flow organization of the heavy haul railway in China,such as cars flow distributed in the form of trains,and higher carrying capacity required for tracks,etc.,the optimization of car flow organization at the loading area of the heavy haul railway running combined trains and unit trains was researched.On the basis,the model for optimizing the car flow organization at the loading end of heavy haul railway was constructed,with the minimum combined time and the maximum car flow as the target.The concept of the combined coefficient was introduced to solve the unbalanced problem of train flow caused by the combined operation of trains.The multi-objective optimization solution was transformed into the network flow model in order to lower its complexity,and the equivalence of its solution was validated.The model was solved by the algorithm of the minimum cost and the maximum flow.Taking Da-Qin Railway for example,the car flow organization at the loading area was studied.Result analyses indicate that the above given model is relatively simple and practical.