[4] The factor leading its creation was to improve Bilbao's railway network; the tram serves neighbourhoods that do not have metro or Cercanías stations.

The first six stops were opened on 18 December 2002 by Juan José Ibarretxe, lehendakari of the Basque Country at the time.

Trams run every 10 minutes during most of the day, and less frequently early in the morning and late in the night.

[10] The first part of the line, from Atxuri to Pío Baroja and again from Sabino Arana to La Casilla runs on the street (albeit on a dedicated lane).

[citation needed] Construction of two more stops started in 2010, one in Autonomía and the second one in La Casilla Square (replacing the one in Errekalde).

The works to convert the line to tramway standard started in 2020, which will include the construction of a new stop serving La Peña and the adaptation of the existing Bolueta station.

[16] This extension won't reach Kukullaga until 2025, because a temporary depot for Line 3 is being built on the tracks around that station.