Renovation And Replacement Works On The Catenary Installation Of Single Ecp1 Mechanical Compensation Equipment For Double Ecp2 Types, Section Sant Cugat - Bellaterra On The Barcelona - Vallès Line, And Section Sant Vicenç Dels Horts - Sant Andreu, On The Llobregat - Anoia Line, Of Ferrocarrils De La Generalitat De Catalunya (Pos103/25)