This is a design-and-build (conceção-construção) contract for the alteration of railway signalling systems on the Sines Line (Ermidas/Raquete section) and on the South Line (Canal Caveira and Ermidas sections) in Portugal. The scope covers the modification and installation of railway signalling infrastructure across these rail corridors. The project is procured by Infraestruturas de Portugal S.A., the national railway infrastructure manager.