Tender Announcement From: Adif - Presidency. Purpose: Drafting Of The Construction Project And Execution Of The Works For The Renewal And Modification Of The Functionality Of The Automatic Protection Of The Level Crossings Located In The Pp.Kk. 2/004, 12/925, 14/101, 17/294, 26/557, 28/212, 30/254, 38/230, 41784, 43/440, 49/342 And 50/166 Of Line 512 Zafra - Huelva Merchandise.