the early 3rd rail electric locomotives of the Etat system, France

SNCF BB 831 in Montrouge, undated

A total of 30 of these Z 6000 class standard gauge locomotives were built between 1924 and 1937. They were intended orginally to be dual voltage 750 V and 1,500 V, but the latter operation was not put into effect until 1937 on the line Paris - Le Mans. Nine of them (later renumbered in the SNCF as 814-822 - the whole class was known as BB 800) were solely for 3rd rail electric current at 750 V and the rest dual voltage with 1,500 V from overhead. They were withdrawn by 1972.

Builder: Société d'Études pour l'Electrification des Chemins de Fer (SEECF)
Pantographs: 2
Traction motors: 4 x T-IX 675 V and 1500 V, ventilated
Continuous output: 682 kW
Weight in service: 64 tonnes
Length excluding buffers: 12.14 metres
Maximum speed: 90 km/h