Tucson's first tram, Sun Link, opened on July 25, 2014. It runs from the University of Arizona to Mercado via the Main Gate business district, historic Fourth Avenue, and the downtown area. That makes it a mainstay of the city's economic, social, and cultural life, all now wheelchair-accessible.
RATP Dev was chosen from the outset to maintain and operate the line. Well before the July 2014 inauguration, teams from RATP Dev's American subsidiary worked closely with the Tucson authorities. In particular, they hired and trained staff to ensure the best possible service from day one.