Chicago Heights Steel operates a special market mill that rolls billet and rail steel. Rail Steel is noted for its strength. Its average yield point is greater than 60,000 pounds per square inch (PSI), while actual tensile strength normally ranges from 100,000 PSI to 130,000 PSI. This high yield point means rail steel provides ample stiffness, enduring heavy demands with little deformation. Rail steel also resists breakage even after the yield point is exceeded. In addition, rail steel has a satisfactory amount of ductility and after re-heating, can be used to complete most forming operations. Chicago Heights can shear, punch and weld its rail steel products to customer specifications. The company also offers heavy-, medium- and light-duty posts in the studded-tee design. Like the rails that support and flex under the weight of a train, Chicago Heights posts have the same combination of strength and resiliency - guaranteeing a minimum yield point of 50,000 PSI and an ultimate tensile strength greater than 80,000 PSI.