In 1948, engineer João de Lemos executed several studies to evaluate the bridge's condition: study of the deck (including structural members); analysis of the continuous beams and the arch's structural supports. The analysis of the stability of the bridge was handled by the Laboratório Nacional de Engenharia Civil (LNEC), that resulted in the injection of cement and repair of the masonry joints and pillars, that connected with metallic structures. At the same time, flaking paint was removed from the structure and issues with corrosion were treated during the work, that included repainting with new metallic paint. These projects resulted from the need to improve the structure for the beginning of CP service across the bridge with improved Series 070 locomotives on 1 November 1950. Following a decade of service, an analytic study in 1966 began to analyze upgrading service to electrical locomotives (Bò-Bó), leading to the end of the electrification of the Linha Norte. Verification, "in loco", determined stressed tests for the structure in 1969.