France

Operating or Under Construction

Angers
Bordeaux
Bourg-St. Maurice-Les Arc
Caen
Clermont-Ferrand
Grenoble
Laon
Le Mans
Leyman
Lille
Lyon
Marseille 
Mont Blanc
Montpellier
Mulhouse
Nancy
Nantes
Nice
Orleans
Paris
Rennes
Rouen

Saint-Etienne (Paris)
Strassbourg
Tignes
Toulon
Toulouse
Val d'Isere
Ville Valenciennes
Villefranche-La Tour de Carol

Planned

Brest
Douai
Dunkerque
Fort-de-France (Martinique)
Le Havre
Reims
Tours

Honorable Mention
La Rochelle
Loire Region
Marne
 

Yellow Train Villefranche La Tour del Carol

Villefranche-La Tour de Carol
Light Railway (interurban)

According to the Wikipedia, this village on the Spanish border in the Pyrenees main claim to fame is that its the site of an international railway station. One of the lines is an electric interurban built in 1908 and now run by the French National Railways.  It is known as the Petit Train Jaun, or the Little Yellow Train. It has been nicknamed Canari and is a symbol of the region. The 63 km line connects the town with the village of Villefranche-de-Conflent, described on one web page as a medieval garrison town suffering from arrested development. Enroute is the station at Bolquere-Eyne, which is the highest railway station in France at 1593 meters above sea level.

Railfan Europe pics
Wikipedia Page