Class Z23500 also called TER 2N (TER 2 Niveaux) is double deck a class of railway electric multiple units operated in France. They were built by GEC-Alstom and Ateliers du Nord de la France, (which became Bombardier) for SNCF and are used on the TER Network. These sets consist of 2 double deck coaches. They were built from 1997 and a total of 80 units were built. The units were ordered by the following regions: Provence-Alpes-Côte d'Azur, Nord-Pas-de-Calais and Rhône-Alpes. They are mainly used on stopping services around the French Riviera (Provence-Alpes-Côte d'Azur), Lille (Nord-Pas-de-Calais) and Lyon (Rhône-Alpes).They are all in the TER livery, which is a Blue Front in a diagonal line with a metallic grey side. However the Rhône-Alpes units have green and purple sides with Rhône-Alpe