The authors study a basic and simple control strategy by managing the capacitor voltage for hybrid powered railway vehicle with a diesel engine EDLCs. In this paper, we first discuss the required capacity of EDLCs considering with the size and mass. Then, we propose a practical and simple method to manage the capacitor energy by changing the diesel engines output power according to EDLC voltage. The capacitance designing method and the proposed control method are verified by numerical simulations of train running, assuming a commercial line in Japan. We have concluded that the proposed method to decide the capacitance and the control method are available and this study contribute to promote environmental friendly transportation system.