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Chinese rails can be divided into  crane rail , heavy steel rail and light steel rail in kilograms per square meter. 1. The crane rail is divided into four types: QU120, QU100, QU80, QU70. The material is generally manganese steel. The single weight is QU120 up to 118kg/m. 2.  Heavy steel rail . According to the steel used, the steel can be divided into ordinary manganese-containing rails, copper-containing carbon steel rails, high-silicon copper-containing steel rails, copper rails, manganese rails, silicon rails, etc. There are three main types: 38kg, 43kg and 50kg. In addition, there are 45kg rails for a few lines, and 60kg rails are planned for use on lines with high traffic and high speed. 3.  Light steel  rail . There are mainly different rail types such as 9kg/m, 12kg/m, 15kg/m, 22kg/m, 30kg/m. Each country in the world has its own standards for the production of rails, and the classification methods are also different. Such as British standard: BS series (with 90A, 8