A railroad vehicle control device comprising: a first power conversion device to perform bidirectional power conversion between a primary side and a secondary side of the first power conversion device, the primary side of the first power conversion device being connected to a power generator driven by an internal combustion engine to generate alternating current; a smoothing capacitor connected to terminals of the secondary side of the first power conversion device; a second power conversion device to convert electric power supplied from a power source connected to an input side of the second power conversion device, wherein the input side and an output side of the second power conversion device are insulated from each other, and to output the converted electric power; a first power storage device connected in parallel to the smoothing capacitor between the terminals of the secondary side of the first power conversion device and connected between terminals of the output side of the second power conversion device, the first power storage device being charged with electric power output by the second power conversion device; a first contactor to switch on and off an electrical pathway between the smoothing capacitor and the first power storage device; and a controller to control the first power conversion device and the second power conversion device, wherein, after the smoothing capacitor is charged with electricity stored in the first power storage device as a result of closing the first contactor, the controller controls the first power conversion device to cause the first power conversion device to convert electric power stored in the smoothing capacitor to supply the converted electric power as electric power for driving the power generator. a first power conversion device to perform bidirectional power conversion between a primary side and a secondary side of the first power conversion device, the primary side of the first power conversion device being connected to a power generator driven by an internal combustion engine to generate alternating current; a smoothing capacitor connected to terminals of the secondary side of the first power conversion device; a second power conversion device to convert electric power supplied from a power source connected to an input side of the second power conversion device, wherein the input side and an output side of the second power conversion device are insulated from each other, and to output the converted electric power; a first power storage device connected in parallel to the smoothing capacitor between the terminals of the secondary side of the first power conversion device and connected between terminals of the output side of the second power conversion device, the first power storage device being charged with electric power output by the second power conversion device; a first contactor to switch on and off an electrical pathway between the smoothing capacitor and the first power storage device; and a controller to control the first power conversion device and the second power conversion device, wherein, after the smoothing capacitor is charged with electricity stored in the first power storage device as a result of closing the first contactor, the controller controls the first power conversion device to cause the first power conversion device to convert electric power stored in the smoothing capacitor to supply the converted electric power as electric power for driving the power generator.