I first looked at this tramway in 2013. It was only a short blog recognising the existence of the line in the valley.
https://rogerfarnworth.wordpress.co...fer-de-provence-8-tramway-in-the-tinee-valley.
This line was 26.5 Km long and connected villages in the Tinée valley to Nice to Digne line. Like other lines of the Tramways Alpes Maritimes (TAM), the electric current was single phase. The civil engineering works (bridges, tunnels) were executed by the Department.
The line was built in 1911 and operation started on 1st April 1912. Landslides affected the operation of the line in the early months. The original opening was delayed from January to April because of landslides and on 2nd April a further landslide affected several hundred metres of track and destroyed power lines.
The line ceased operations in 1931.