China Railway 21st Bureau Group Fourth Engineering Co., Ltd., established on 2001-11-14, Business scope includes construction general contracting,General Contracting of Municipal Public Works Construction,General Contracting of Railway Engineering Construction,General Contracting of Highway Engineering Construction,Mechanical and electrical engineering construction general contracting,Professional contracting of lifting equipment installation engineering,Professional contracting of fire protection facilities engineering,Professional contracting of bridge engineering,Professional contracting of tunnel engineering,Steel structure engineering professional contracting,Professional contracting of building decoration and decoration engineering,Highway pavement engineering professional contracting,Highway subgrade engineering professional contracting,Ancient architectural engineering professional contracting;Environmental engineering professional contracting,City and road lighting engineering professional contracting,Professional contracting of waterproof, anti-corrosion and thermal insulation engineering,Electronic and intelligent engineering professional contracting,Professional contracting of building mechanical and electrical installation engineering,Highway Traffic Engineering(road safety facilities)Professional contractors;Highway greening project,Urban road greening project,Landscaping engineering construction;Mining;Safety technology prevention engineering design,construction,maintain,consultation service;Construction machinery and equipment,Leasing of revolving materials;Network integrated wiring,Information system integration service;asphalt,new building materials,building materials,Decoration materials,Mechanical equipment and accessories,Railway equipment and accessories,Wujinjiaodian,Electrical products,Security monitoring equipment,Sales of communication equipment;Sand and gravel aggregate,Processing of commercial concrete and its products,Sales;Warehousing Services(Free of Hazardous Chemicals);Ordinary road freight transport(Involved in licensing projects,It should be operated after obtaining the permission of the relevant department)