A train including a plurality of rail cars (1, 2, 3, 1A) coupled together into a train, each of the plurality of rail cars comprising a DC power bus for DC power supply, and the DC power buses being connected together and laid through the train, wherein: each DC power bus comprises a common bus line, and is connected to the DC power bus of another rail car in the train; a first one of the rail cars is equipped with a first power supply device configured to generate power to supply DC power to the DC power bus, the DC power bus and the first power supply device being connected together; a second one of the rail cars is equipped with a second power supply device configured to receive power from a catenary to supply DC power to the DC power bus, the DC power bus and the second power supply device being connected together; a third one of the rail cars is equipped with power conversion means for converting DC power fed from the DC power bus into voltage/frequency variable AC power and an AC motor driven by the AC power to generate a tractive force for the cars, the DC power bus and the power conversion means being connected together; a fourth one of the rail cars is equipped with an auxiliary generation device to supply power to passenger service apparatuses, the auxiliary generation device including an internal combustion engine 10A, an auxiliary generator 11A, and a power converter 12A; and characterized in that: the train is equipped with a train control system comprising terminal devices mounted on the respective rail cars and each configured for monitoring and controlling the operational status of the corresponding onboard apparatus, and transmission paths each connecting the terminal devices together, the train control system determining and controlling the electric generating capacity. each DC power bus comprises a common bus line, and is connected to the DC power bus of another rail car in the train; a first one of the rail cars is equipped with a first power supply device configured to generate power to supply DC power to the DC power bus, the DC power bus and the first power supply device being connected together; a second one of the rail cars is equipped with a second power supply device configured to receive power from a catenary to supply DC power to the DC power bus, the DC power bus and the second power supply device being connected together; a third one of the rail cars is equipped with power conversion means for converting DC power fed from the DC power bus into voltage/frequency variable AC power and an AC motor driven by the AC power to generate a tractive force for the cars, the DC power bus and the power conversion means being connected together; a fourth one of the rail cars is equipped with an auxiliary generation device to supply power to passenger service apparatuses, the auxiliary generation device including an internal combustion engine 10A, an auxiliary generator 11A, and a power converter 12A; and characterized in that: the train is equipped with a train control system comprising terminal devices mounted on the respective rail cars and each configured for monitoring and controlling the operational status of the corresponding onboard apparatus, and transmission paths each connecting the terminal devices together, the train control system determining and controlling the electric generating capacity.