(The following scope does not include pre-licensing projects; post-licensing projects shall be operated with licenses or approval documents) Design and manufacturing of metal bridge structures and bridge parts; design and manufacturing of building metal structures and components; design and manufacturing of rubber products; design and manufacturing of railway locomotive and rolling stock parts and railway special equipment and accessories; design and manufacturing of environmental pollution prevention special equipment; engineering design, engineering consulting; environmental protection engineering, steel structure engineering; manufacturing of traffic equipment and other transportation equipment, traffic safety and control special equipment, water resources special machinery; wholesale and retail of commodities; import and export industry; special professional engineering contracting; design, manufacturing, leasing, and related technical services in the field of urban low-floor vehicles and parts; synthetic material manufacturing; plastic products industry; gypsum, cement, and similar product manufacturing; power distribution and control equipment manufacturing; software and information technology services; general contracting construction of municipal public works; general contracting construction of highway works; professional contracting construction of building mechanical and electrical installation; professional contracting construction of highway traffic engineering; urban rail transportation; railway engineering, tunnel engineering, and bridge engineering; railway track laying and beam erection engineering.