The EPC contract of Power Supply System for Tehran Metro. Line 4, signed between "Tehran Urban & Suburban Railway Company / Metro" and "PARSIAN". The contract is enforced, design & ordering for required equipment of this project is now commenced. Engineering, detail designing, supplying, installing, testing & commissioning are different included parts of this project. High Voltage substations including the 63/20kV Gas Insulated Switchgear (GIS),20kV Switchgear, AC/DC System, cabling, Protection & Control and Annunciation System and Transformers; Traction/Rectifier Substations including the Transformer-Rectifier, 20kV Switchgear, 750VDC Switchgear, AC/DC System, Cabling ; Lighting & Power Substation including the Dry Transformers, 20kV Switchgears, LV Switchgears, Cabling, AC/DC System ; Contact Rail System; earthing System; Substations Automation System; Power Cabling; Stray Current Protection System; Spare Parts; are involved with this project.