The Collonges-Fort-l’Écluse – Divonne-les-Bains railway is a French railway line linking the Lyon-Geneva Railway from a junction near Collonges to Divonne-les-Bains. It crosses the whole of the region called the ‘Pays de Gex’ and is 38 km long. It used to continue through to Nyon in Switzerland.It is line number 891 000 of the French rail network.