An agreement on 23 February 1904, validated by a decree on 26 March 1904, authorised the Compagnie Générale Française de Tramways (CGFT) – which operated the Marseille tram network – to build a line from Saint-Marcel to Aubagne on the condition that the departures take place from Place Saint-Ferréol.

It originally had a single track outside of Marseille (doubled between 1926 and 1930) laid on a sidewalk along the national road.

The tram line, like the municipal bus system which has been operating tariff-free since 15 May 2009, set a world first in public transportation.

In 2019, Bouches-du-Rhône Departmental Council President Martine Vassal announced an extension of Line T to La Bouilladisse via Roquevaire and Auriol.

The project, which will cost 136 million euros, is partly founded on the disused Aubagne to La Barque Line, which closed in 2002.