AREMA Standard Steel Rail function: Guide the wheels of the rolling stock forward, withstand the huge pressure of the wheels, and transfer to the sleeper.The section shape of the rail adopts the I-shaped section with the best bending performance, and the rail head, the rail waist and the rail bottom are composed of three parts. In order to make the rail better withstand the force from all sides and ensure the necessary strength conditions, the rail should have enough height, and the head and bottom should have enough area and height, and the waist and bottom should not be too thin.