Railroad signs are made of heavy-duty aluminum with high-intensity prismatic film, extruded into a dog bone shape. Innovative “Dogbone” metal extrusion is practically inflexible, ensuring that your sign does not twist or bend in the wind. Standard metal backings often fail in gusts. Competitor signs are often flat 80 mil thick, while most railroads highly recommend a “dogbone” shape to prevent the sign from twisting in the wind. States require tapered dogbone design for enhanced stability. This adds to both the efficacy and longevity of the sign.