Line 9 is a line of the Barcelona Metronetwork that is currently under construction, with five stations open in the Santa Coloma de Gramenet suburb since December 2009. Upon completion, it will be the longest automatic metro line in Europe.
The total system will have a length of 29 mi (47.8 km), 27 mi (43.71 km) underground and 3 mi (4.09 km) of viaducts. L9 will be the deepest line in the Barcelona network.
The Viaduct circulates at the median of Street A at the Port Authority Area in Barcelona and it is part of the new Metro Line 9 connecting El Prat Airport (Barcelona’s International Airport) and Badalona crossing Barcelona.
The viaduct is 8202 ft (2500 m) long and it is one of the largest bridges in Spain. The Viaduct includes three elevated stations.
The deck has been designed as a succession of simply supported spans 108 ft (33 m) long to minimize interferences with existing utilities and the heavy traffic in the industrial area. Economy has been a major requirement governing the design that has been combined with the aesthetic criteria defined by the architects of the Municipality of Barcelona.
Jordán J., Ferraz R., Sobrino, J.A.; Puente de la línea 9 de metro en Barcelona (Barcelona Metro Line 9 Bridge). Proceedings of the 2nd Bridges and Structures Conference of ACHE. Zaragoza, November, 2005.