Service Contract For The Quality Control Technical Assistance Of The Works To Improve The Accessibility Of The Interchanges Of Sants - Station (Lines L3 And L5 Of The Fmb - Adif Lines), Passeig De Gràcia (Lines L2, L3 And L4 Of The Fmb) And Catalonia (Lines L1 And L3 Of The Fmb). Barcelona Phase 1. Key: Tm-16202.F1 (EXPIRED)