Analysis of the Effect of Optimization of Wagons Allocation on Reducing Transportation Costs in Tehran Subway Network

An intra-city rail transport system is a system in which a train ram travels at specified stations and in a direction between the origin and the destination. In this study, a model has been developed to minimize the operation cost of transport system. Hence an integer linear mathematical model was proposed for planning on four subway lines in Tehran out of seven existing lines and optimizing the number of wagons assigned to the lines that solved using WinQSB software. The purposes of this paper is to reduce the cost of the subway network, present a planned model to encourage individuals to use this type of transportation system, and thereby reduce traffic and air pollution in the metropolis of Tehran. To evaluate the proposed model, at first the present situation is compared with the results of the proposed model. The results showed that the proposed model would reduce the average costs incurred (electric power consumption and repair costs of wagons) by 33% in a month.