Prototype For Later Designs
Unlike the previous three dual-voltage locomotives, which were only meant to operate on Aix-Annecy and got 1.5kV equipment for the purposes described above, this locomotive can be considered the first "real" SNCF dual-voltage locomotive.
Next to its present AC equipment, a small DC equipment was built in to operate under 1.5 kV, however with limited power. Although BB20004 is generally considered the prototype of the BB25500 locomotives this is not entirely true. BB25500 locomotives are based on BB16500 locomotives for the greater part, but some equipments were either parts which were not used on BB16500 locomotives but on older locomotives, or entirely new designs. BB20004 contributed however a big part to the realisation of the BB25500 and later dual-voltage locomotives and expanded the knowledge of dual-voltage locomotives greatly.
Read more about this topic: SNCF Class BB 20004
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