Lot No. 3 of the first phase of the Rapid Rail Network (RFR) project in Greater Tunis, specifically for Line D, involves the construction of buildings for the 08 stations on this line connecting Tunis to Gobaa. This lot includes the development of infrastructure for passenger services such as platforms, ticket offices, and waiting areas. It is a key component of the overall RFR project, aimed at modernizing public transport in Greater Tunis by offering a fast, high-capacity alternative to reduce traffic congestion.