It is operated by TRAMMET connecting the Baix Llobregat area with the city of Barcelona, Catalonia, Spain.

An extension of Tram T3 opened on 8 December 2006, as far as Consell Comarcal in Sant Feliu de Llobregat.

In September 2008 the mayor of Barcelona, Jordi Hereu, said in a TV programme that in the near future (2011–2012) both tram networks would be connected along the Diagonal Avenue.

Finally in January 2019, Barcelona's city council approved the project with support of mayoress Ada Colau.

[3] Phase 2 will link Verdaguer with Francesc Macià, thus completing the connection of the two separate tram networks.