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Hollow aluminum extrusions with truss cross-section have integral functions of the outer skin, frame and interior lining. Attractive all-aluminum "boxes" formed by connecting double skins constitute the car body structure of the new system. Superior heat and sound insulation are available because of the hollow structure; moreover, vibrations are suppressed to a low level. Every extrusion can be used for various types of car bodies, and by changing the curvature of the curved members, a wide variety of cross sections of car body can be obtained. The A-train is a system that offers flexibility in construction and freedom of expression.

Left : Illustration of the Aluminum double skin, Right : Close up illustration of the Aluminum double skin