 TGVs travel at up to in commercial use.All are at least "bi-current", which means that they can operate at 25 kV, 50 Hz AC (including LGVs) and at 1.5 kV DC (such as the 1.5 kV "lignes classiques" south of Paris).Trains to Germany, Switzerland, Belgium and the Netherlands must accommodate other voltages, requiring "tri-current" and "quadri-current" TGVs.