The Fluid Wagon is a medium-sized, rectangular rail car designed with a pixel-art isometric aesthetic, featuring a series of large, cylindrical tanks mounted on a flatbed frame. The tanks are smooth and metallic, with visible seams and rivets for a constructed look, colored in muted industrial tones like steel gray or rusted orange. Each tank has a capped valve on top and piping connections at the ends, indicating its function for transporting liquids. The undercarriage includes standard rail wheels and coupling mechanisms, aligning with Factorio's industrial theme.