Trambesòs () is a tram–light rail system in the Spanish autonomous community of Catalonia that links the Barcelona district of Sant Martí with Badalona and Sant Adrià de Besòs. Its name comes from the union of the words "tram", an abbreviation of the Catalan word for "tram" (tramvia), and "Besòs", the name of an area in the north of the Barcelonès region dominated by the Besòs River. The first section of Trambesòs was opened on 8 May 2004 as part of route T4 and since its opening it has undergone several extensions, the last of which took place on 15 June 2008 with the creation of route T6 between Sant Adrià de Besòs railway station and Gorg metro station in Badalona. Trambesòs is operated by TRAM. It complements the Trambaix that runs to the south-west of the city. Both networks will be interconnected through Avinguda Diagonal in the next construction phase. System overview The system comprises 27 stops and has a total length of whereby three different routes are run. The network is configured as a double-track electrified tramline built to the standard track gauge that starts near Parc de la Ciutadella in the Barcelona district of Sant Martí and continues towards Badalona and Sant Adrià de Besòs through Gran Via de les Corts Catalanes and Avinguda Diagonal, the system's two main arterial corridors to enter Barcelona. There is also another branch that crosses the La Rambla de la Mina street in Sant Adrià and connects the Gran Via section with the Avinguda Diagonal one. Trambesòs uses exclusive infrastructure such as a reserved platform for its circulation along all its route and dedicated signaling. The exclusive use of the reserved platform by the tram is meant to provide greater regularity, speed and safety, and it only has contact with other vehicles at several existing at-grade intersections with the local street system. These intersections are regulated by traffic lights, which do not have the traffic signal preemption system fully operational, what would allow the tram to reach . The reserved platform houses the tracks, the overhead contact system, the dedicated signaling and the railway platforms. In addition, it is level with the sidewalks in most of its path and is sometimes grass-covered or simply covered in concrete or asphalt concrete like the road surface. In order to supply electric power to the overhead line, six substations were built along the line,