The Chemin de Fer de la Corse (CFC) is a fascinating metre gauge rail network serving the French island of Corsica.

At the time of my visits in the 1980s it was a delightful combination of beautiful scenery and quaint rolling stock.

Billard Autorail Type A80D no 503 was built for the P.O. Correze in the mid-1930s. 

It subsequently moved to Corsica and was used in regular passenger service in red and cream livery until about 1984

Locotracteur no. 114 of the CFC (Chemins de Fer de Corse) was built in the works at Bastia in 1955 from secondhand parts. 

The locotracteur was known as the "Sous-Marin" on account of the round windows.  Quite why is a mystery because submarines don't have round windows!