Works For The Renovation Of The Catenary In The Ribes Vila Workshops, Installation Of Protections And Safety On The 2 Tracks Of The Workshop, Installation Of A Feeder On The Section Ribes Vila – Queralbs To The Workshop, Installation Of A Disconnector On The Section Ribes Enllaç – Ribes Vila, And Renovation Of The Pendulums On The Section Queralbs-Nuria Of The Cremallera De Núria De Ferrocarrils De Ferrocarrils De Catalunya (Ref. Pos87/25)