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.
Due to its gradient's steepness, the line was electrified from the start with an unusual, potentially unique voltage of 2,200 Volts DC. The French section from La Cure to Morez ceased operations on September 28, 1958.