This is a private narrow gauge railway between Digne and Nice through the Alpes de Haute Provence. The guage is one metre, compared with the normal 1.4 in use on SCNF railways.
I do not know whether I am as thick as the wall or whether it is a closely guarded secret, but the type of pass I had on Air France and SNCF which allowed half price travel on the Train des Pignes is no longer available and it took me ages to find any details of a pass which still allows it. Eventually I found it at this website, which looks as if it may help. We were able to travel four days out of about sixteen on SNCF and half price on the Traun des Pignes throughout that period. Obviously this allows for various possibilities.
Ordinary prices are easier to find. These and other details are to be found on this website. Note that there are reductions of 25% for seniors and 20% for students.
There are two main purposes for the train. The first is the normal one of getting to places and enjoying the spectacular scenery of the line. In this context Annot and Entrevaux are both great. The other is to increase the number of walks which can be undertaken from any place on the line.
It is fascinating to watch the Chef du gare put on his official hat at a station just before the arrival of a train and shake hands with the driver - every time.