Trambesòs (Catalan pronunciation: [ˌtrambəˈzɔs]) 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 north-west of the city. Both networks will be interconnected through Avinguda Diagonal in the next construction phase.(Wikipedia)