This Code is prepared according to the requirements of National Railway Administration regarding establishing the railway engineering construction standard system，based on the previous edition of this Code，with the view to meeting the needs of construction and development of railway bridges，unifying the design standards，improving the design level， and ensuring the safety and quality of steel structures of railway bridges； this Code is prepared also by summarizing and absorbing the experience and scientific research results in recent years in the field of construction and operation of bridge steel structures used in China's high-speed railways，intercity railways，mixed passenger and freight railways and heavy-haul railways.In this Code， the principle of giving priority to safety is implemented， the requirements on quality safety，resources conservation and environmental protection are enhanced，the overall design is emphasized； the main design criteria of steel structures of railway bridges with different transport properties and different speed classes are rationally determined in consideration of the national situation，the economic and social development level and the environmental conditions in China，so that the scientificity and technical-economic rationality of this Code have been further improved.In recent years，a lot of new materials，new structures and new techniques in the field of railway steel bridge design have emerged in China， such as Q500q steel， all-welded panel joint，monolithic steel deck，and cable-stayed bridge and suspension bridge more than 1 000 m long，etc，and these advanced achievements and proven experience are summarized and absorbed in this Code.The Code consists of ten chapters，namely General Provisions，Terms and Symbols，Materials and Basic Allowable Stresses，Calculation of Internal Force，Calculation Length，Slenderness Ratio and Cross Section of Members，Connection of Components，Deck System and Connecting System，Steel Plate Girder，Steel Truss Girder，and Bearing.Five appendixes are provided.
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