Railway construction essentially belongs to the field of transportation. Basically, purchasing information or planning information will be released in the Ministry of Transport or local transportation bureaus, such as the Shandong Provincial Department of Transportation.
Since we are looking for bidding information, a third-party bidding platform is also possible. There are many kinds of industry classifications involved, and the railway industry must exist. You can look for a third-party platform and go directly to its subnet railway engineering bidding network, which contains railway construction information from all over the country.