The SNCF Class BB 9400 was a class of Bo'Bo' electric locomotives of SNCF. They were used to haul L’Aquilon, a high-speed passenger train between Paris, Dijon and Lyon-Perrache. The locomotives were given the nickname "Vespa", as they were very lightweight. They were one of a series of locomotives referred to as "BB Jacquemin", as they used bogies designed by engineer André Jacquemin. The locomotive itself was designed by noted French railway designer Paul Arzens. In later years they hauled passenger trains on the difficult Béziers–Neussargues line.