The SNCF Class BB 66400 is a class of centre cab mixed traffic diesel locomotives. The class is a development of the BB 66000 with 3 phase electric transmission. The 106 locomotives were built for SNCF by a consortium of CAFL, CEM, Alsthom, Fives-Lille and SACM between 1968 and 1971. They are 14.972 m (49.12 ft) long and weigh 64 t. The prime mover is a MGO V16BSHR diesel engine developing 1,030 kW (1,380 hp). The maximum speed is 120 km/h (75 mph).