An Optimization Model of Railroad Network Design and Investment Including Multiple Projects in Several Five-year Plans

Railroad network design and investment are hard to be optimized quantitatively for the sake of the large-scale network and complex environment.This paper discusses the impact of limited investment on the optimal choice of the railway project by means of optimizing both the the project investment and cost of routing cars,and constructs a model of railroad network design and investment including multiple projects in several Five-year Plans.The economies of scale in cost of investment and cost of transportation are involved in the model.With designing the 0-1 variable about the project of corridor,the model expresses the impact of project in the previous Five-year Plan on the current investment.In addition,it assigns freight flow to optimality according to the tree-shape path that is closer rail practice.The objective is to minimize the operating cost of the freight and passenger flow,the shadow cost of unsatisfied demand,and the investment cost of projects in all Five-year Plans,subject to limits on the total budget in every Five-year Plan.