The 2C2 3100 were a class of electric locomotives of the Chemins de fer du Midi, France.

They were designed for alternating current at 12 kV, 16+2⁄3 Hz but, before construction, they were re-designed for direct current at 1,500 V. These locomotives were ordered from Constructions Electriques de France (CEF), Tarbes in 1914 following the decision to electrify the Midi network at 12 kV 16+2⁄3 Hz and to order six prototypes locomotives.

Their delivery was delayed by the First World War and then by the government decision of 1920 to adopt 1,500 V direct current for new electrification schemes.

Later, with the increase in train weight, following the arrival of metal carriages, they were seen as underpowered and were replaced by the 2D2 locomotives of the Compagnie du chemin de fer de Paris à Orléans (PO).

The 2C2 3100 was reproduced in HO scale by the British manufacturer DJH / Model Loco, as a kit (white metal and brass) to be assembled and painted.