Abstract: A rail vehicle includes a roof structure that configures an upper face, a side structure that configures a side face, a gable end structure that configures an end face in a longitudinal direction, and an underframe that configures a lower face. The underframe is configured from a hollow shaped member formed from two face plates and a rib that connects the face plates to each other.

Abstract: A rail vehicle including an underframe that contributes to improvement in assembly and that is light in weight and high in rigidity is provided. The rail vehicle includes an underframe including a floor body structure that forms a floor surface and a bolster. The bolster includes a first shape member arranged at a middle portion of the bolster, at least part of the first shape member being formed by extrusion along a widthwise direction of the floor body structure, a second shape member connected to each of opposite end portions of the first shape member in the widthwise direction of the floor body structure, at least part of the second shape member being formed by extrusion along a lengthwise direction of the floor body structure, and a plate-shaped member connected to a side beam and connected to the second shape member.

Abstract: Provided is an FRP optimization system capable of efficiently determining the most suitable FRP specs for improving the reliability of an entire mechanical structure and its joints.