Covered in this film are two most unusual electric railways which survive in France's far south.
One is the 62km (39 mile) metre gauge Train Jaune, or Petit Train Jaune de Cerdagne, Yellow Train, or "metro of the Pyrenees".
This 850V third-rail electric line runs east to west, just north of the Spanish border.
Much of its tortuous route traverses rugged country, with steep grades, many tunnels and two spectacular viaducts.
It terminates at a rare triple gauge station.
The second is a 4.2km rack railway to the peak of a mountain called La Rhune, right on the Spanish border in France's Basque country.
Metre gauge, equipped with Strub rack on its 1 in 4 (25%) grades, it is a rare three-phase AC survivor, with typical two-wire overhead and bow collectors.
The original Edwardian 1912 stock is still in use.
Both are interesting as very early examples of electrical power being used on railways - albeit unusual ones.
Produced by - Camden
Running time - 100 Minutes