fa سایر موضوعاتی که به مرزهای دانش در مهندسی صنایع و تولید کمک می کند Other related Industrial and production reserach subjects in which has direct relation to the state-of-the art of the IE پژوهشي Research <p> <i> In this paper, a discrete event simulation model of Iranian railway system is used for analyzing performance of the system in freight sector. The model analysis shows more sensitivity of the system on loading and unloading facilities than on number of wagons and locomotives. System optimization through simulation optimization technique, shows that more than 4% of all wagons available in the network are not needed. Data Envelopment Analysis (DEA) method is used for analyzing overall performance of the system. Based on the DEA results, the system currently perform more than 19% under nominal performance, and that will be improved more than 5% after removing the excess wagons </i><i>. </i></p> Railway, Performance Analysis, Fright Transportation, Discrete Event Simulation, Data Envelopment Analysis 263 272 http://ijiepm.iust.ac.ir/browse.php?a_code=A-10-304-4&slc_lang=fa&sid=1 Amirsaman Kheirkhah amirsamankheirkhah@yahoo.com 180031947532846005270 180031947532846005270 Yes Bu-Ali Sina University, Faculty of Engineering, Industrial Engineering Department, Hamedan, Iran Hassan Zolfaghari 180031947532846005271 180031947532846005271 No Bu-Ali Sina University, Faculty of Engineering, Industrial Engineering Department, Hamedan, Iran