It carries a variety of traffic: TGV Paris-Geneva, Geneva - South of France, TER Auvergne-Rhône-Alpes, Léman Express and goods trains.

From Culoz the line runs close to the Rhône to Bellegarde-sur-Valerine where it meets the Ligne du Haut-Bugey.

Thereafter, the line descends close to the Rhône, crossing the Swiss frontier between Challex and la Plaine.

Because it was electrified and signalled to a French system but operated in part by the Swiss Railways there were several unusual hybrids on the line, illustrated in the photos, including Suburban traffic on the Geneva- Bellegarde section is increasing steadily[1] and the single track section is expected to become a serious bottleneck.

The project was supposed to be finished by end 2019, with an estimated cost of 56mio CHF, financed by the Canton of Geneva.