Bidding Adif - Presidency Announcement. Object: Drafting Of The Constructive Project And Execution Of The Works The Renewal Of The Protection Of The Pp.Nn. Located In The Pp. Kk. 299/146,299/526,302/128,302/363,304/357,304/504.5/187 And 23/414 Of Line 764 Trubia-Collanzo; The Renewal Of Those Located In The Pp.Kk. 5/773 And 7/668 And Modification Of The Functionality Of The Located In The P.K. 7/133 Of Line 760 Oviedo-Trubia (Asturias). File: 3.25/27506.0010.