A multi-objective model to determine the optimal number and allocation of rail freight wagons: A case study

In this rsearch, the modeling of determining the optimal number and allocation of freight wagons of an Iranian railway company is presented in the form of a pure integer programming model. In Section 1, a dynamic single-objective model considering the owned wagons was presented. By using GAMS software, the model was solved. Then in section 2, an innovative dynamic multi-objective model was proposed.