I want to find an expert in the bidding information of China Railway Bureau to show me how to find details! thank you

You can go to China Railway Engineering Information Network, which contains comprehensive railway bidding information. You can also go to Yixin. Bidding and purchasing information of construction engineering, water treatment, monitoring, cables, valves, sculpture, fire protection, decoration, etc. It is comprehensive, covering counties and urban and rural areas. You can find what you need.