Renovation And Replacement Works On The Catenary Installation Of The Single Ecp1 Mechanical Compensation Equipment For Double Ecp2 Types, Section La Floresta - Volpelleres On The Barcelona - Vallès Line, And Section Piera - Masquefa, On The Llobregat - Anoia Line, From Railways Of The Generalitat Of Catalonia. (Ref: Pos154/24)