AREMA Standard Steel Rail is one of the main components in the transportation system that carries all the wheel loads. The rail is composed of two parts, the upper part is the wheel bottom with a cross-section of “I” shape, and the lower part is the steel base bearing the load of the wheel bottom. Rail is generally made of high-strength steel, with high strength, fatigue resistance, corrosion resistance and other excellent properties. Rail categories are divided according to the cross-section shape and size, usually using international model identification.