Abstarct: Nowadays, the urban rail transit networks have been taken attention by researchers due to advantages such as safety, rapid transit, no environmental pollution and high passenger capacity. Considering the high amount of energy loss in urban rail lines, methods of saving energy in these systems are important. Due to the use of rectifier diodes the braking energy is not reversible to the network and is usually lost in the form of thermal energy. The use of energy storage equipment can play a significant role in the reduction of losses, voltage regulation and increasing reliability of the network. In this thesis, the metro system including three stations and two substation of traction is simulated in MATLAB software. Given that in the place of substation of traction there is direct connection between forward and backward paths, in references a half-bridge DC-DC converter has been used for storage of braking energy. While in this thesis, the purpose is the design of a suitable energy storage system and investigation of its performance when there is no direct connection between forward and backward paths. It should be noted that according to the parameters such as speed of charging and discharging, efficiency and lifetime, the super-capacitor has been selected as the appropriate equipment for storage. The advantage of proposed converter for reproductive energy storage, in addition to the easier control method is the use of one super-capacitor for both forward and backward paths. Substations of traction that supply the required energy for train are located in stations one and three and the proposed converter has been installed in the station two. Three different scenarios including train movement from station one to three, simultaneous arrival of trains to the station two and simultaneous exit of trains from station two are investigated. In these scenarios the train movement is associated with three conditions of accelerating, moving at a constant speed and braking. The obtained results show that the proposed DC-DC converter reduces losses in the braking resistor in addition to reducing the current drawn from the Substations of traction and DC bus voltage regulation.