SNCF Class BB 12000

Specifications
Configuration:;
• UIC	Bo′Bo′
Gauge	1,435 mm (4 ft 8 1⁄2 in)
Length	15.200 m (49 ft 10 3⁄8 in)
Loco weight	83.4–85.6 tonnes (82.1–84.2 long tons; 91.9–94.4 short tons)
Electric system/s	25 kV 50 Hz AC
Current pickup(s)	Pantograph, 2 off
Traction motors	SW 435, 4 off

Type and origin
Power type	Electric
Builder	Schneider-Westinghouse, Alsthom, Schneider-Jeumont
Build date	1954–1961
Total produced	148

SNCF BB 12000
	Locomotive BB-12000, at the entrance of the city of Nouvion-sur-Meuse
Type and origin
Power type	Electric
Builder	Schneider-Westinghouse, Alsthom, Schneider-Jeumont
Build date	1954–1961
Total produced	148
Specifications
Configuration:;
• UIC	Bo′Bo′
Gauge	1,435 mm (4 ft 8 1⁄2 in)
Length	15.200 m (49 ft 10 3⁄8 in)
Loco weight	83.4–85.6 tonnes (82.1–84.2 long tons; 91.9–94.4 short tons)
Electric system/s	25 kV 50 Hz AC
Current pickup(s)	Pantograph, 2 off
Traction motors	SW 435, 4 off
Performance figures
Maximum speed	120 or 140 km/h (75 or 87 mph)
Power output:;
• Continuous	2,470 kW (3,310 hp)
Career
Operators	SNCF
Numbers	BB 12001 – BB 12148
Retired	2000

The SNCF Class BB 12000 were electric locomotives operated by SNCF. The first examples arrived on the railway in 1953, operating on the 25 kV 50 Hz line to the coal mines of the Houillères de Lorraine in the north-east of France.^[1]

History

BB 12001 arrived in Mohon on July 17, 1954. Tried first along the Valenciennes – Lumes line, specifications called for a locomotive capable of pulling 750 tonne trains along a grade of 10 ‰. The 12000 Class proved more than capable, pulling 1100 tonne then 1400 tonne trains. BB 12006 using a different system of gears could pull 2000 tonne trains.^[1]

The 12000s integrated well with the SNCF CC 14100 series. SNCF would own 148 of this type of locomotive and another 20 were delivered to the Société Nationale des Chemins de Fer Luxembourgeois in Luxembourg as their Class 3600.^[1]

Technical Details

Each locomotive weighed 84 tonnes. They used ignitrons as current rectifiers. After the graduator and the transformer, single phase current is rectified by eight ignitrons feeding series-wired electric motors. Smoothing chokes produced a "wavy" a current that was well accepted by the motors. The locomotives started slowly and smoothly over wet rails. The electric engines can support a very large overload current of 1800 amps, well over the 1000 amp design. They suffered very little wheel slip; they could pull 1756 tonnes trains on a 10 ‰ grade and 2885 tonnes trains on a 5 ‰ grade.^[1]

The locomotives had few flaws, none of which related to the electrical components. They had cramped cabins, poor braking and couldn't work as multiple-unit sets.^[1]

References

1 2 3 4 5 CUYNET, Jean (2008). "Les débuts du courant " industriel " à la SNCF" (PDF). J3eA (in French). EDP. 7: 1–13. doi:10.1051/j3ea:2008040. Retrieved 9 March 2015.

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[j3ea-1] 1 2 3 4 5 CUYNET, Jean (2008). "Les débuts du courant " industriel " à la SNCF" (PDF). J3eA (in French). EDP. 7: 1–13. doi:10.1051/j3ea:2008040. Retrieved 9 March 2015.