The TGV Sud-Est fleet was built between 1978 and 1988 and operated the first TGV service from Paris to Lyon in 1981. Formerly there were 107 passenger sets operating, of which nine were tri-current (25 kV 50-60 Hz AC - French "lignes à grande vitesse", 1500 V DC - French "lignes classiques", 15 kV 16⅔ Hz AC - Switzerland) and the rest bi-current (25 kV 50–60 Hz AC, 1500 V DC). There were also five, later seven, bi-current half-sets - TGV La Poste - without seats which carried mail for La Poste between Paris, Lyon and Avignon. These were painted in the distinctive La Poste yellow livery.