The Operation consists of Signalling and Telecommunications activities, to be implemented in three Corridors: 1.North International Corridor: Pampilhosa-V.Formoso, Line of Beira Alta 2.International South Corridor: Sines line (Sines-Ermidas section) which includes part of the Southern Line (Eremidas-Grândola Norte) and section Évora-Elvas/Caia (new Evora Line and part of the Eastern Line, between Elvas and border) 3.North-South Corridor: Contumil-Ermesinde