Abstract: “Todays, urban transportation began to get more importance because of increasing rates of urbanization and the traffic problems. Therefore, railway systems have started to play a key role in urban transportation with technological development because of rapid transit, less carbon emission, low ratio between the energy consumption and transport capacity. In this study, the grid and DC traction power supply system of a subway which is the widespread urban electrical railway systems has been modeled by using MatLAB Simulink. Electrical analysis was carried out of the subway line according to the variable load and different line distance.”

Keywords: traction, power, railway, transportation, energy