The construction of Avinguda Diagonal is one of the projects it entailed that became reality, when a Royal Decree from Queen Isabella II of Spain and Leopoldo O'Donnell's Spanish government in Madrid allowed him to start the construction of the avenue in 1859.
It would have been a line crossing the city's most important avenue, Avinguda Diagonal, from northwest to southeast, through central Barcelona.
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As of 2009 the current project to link the two main modern tram systems (Trambaix and Trambesòs) through Avinguda Diagonal may be considered its successor, even though the exact location of the stations and the nature of the tram system to be used have not been finalized.
Since the entry of the new local government headed by Xavier Trias in 2011, the proposal of connecting Trambaix and Trambesòs through Avinguda Diagonal was dismissed, though it has been agreed to reactivate the linkage project with the Generalitat.