The line was built at the instigation of Dr. Salvador Andreu, who was building a residential project around the axis of the Tibidabo Avenue, and was inaugurated in 1901. The line connected at
Plaça Kennedy with trams of Barcelona's city system, but was independently owned. The line's own distinctive blue livery soon led to it becoming known as the Tramvia Blau. In 1971 the remaining tram routes of the
Tranvías de Barcelona company were closed. However, the separately owned Tramvia Blau remained in operation. It continued in private ownership until 1979, when it was taken over by the city, who continued to operate it. Between 1971 and 2004, when the second generation
Trambaix and
Trambesòs lines opened, it was the only tram route in the city. Operation ceased on 28 January 2018, pending planned reconstruction that did not proceed. Rebuilding may now begin in conjunction with a project to rebuild Avenida Tibidabo starting in 2027 or 2028, but there are no firm plans yet. ==Operation==