Because of its steep gradients the line was electrified from the outset at the unusual, if not unique, 2,200 Volts DC. The  French section from La Cure to Morez closed on 28 September 1958.
Because of the incline's steepness, the line was electrified at a high voltage of 2,200 Volts DC from the beginning. The French segment between La Cure and Morez closed down on September 28, 1958.