A third line, the C line, is under construction with an estimated cost of €3 billion and will have 30 stations over a distance of . It will partly replace the existing Termini-Pantano rail line. It will feature full automated, driverless trains. The first section with 15 stations connecting Pantano with the quarter of Centocelle in the eastern part of the city, opened on 9 November 2014. The end of the work was scheduled in 2015, but archaeological findings often delay underground construction work.