SNCF BB 20011 and 20012

The SNCF BB 20011 and BB 20012 were two electric locomotives used for testing, built by Alsthom between 1985 and 1986 as the synchronous dual voltage prototypes for the Class BB 26000. In 1985 and 1986 locomotives numbered 22379 and 22380 of the BB 22200 class were modified to test dual voltage electric traction equipment, microprocessor control and auxiliary variable speed induction motors, and 20012 was used to test the combination of the pneumatic brake system and the electric brake system. In 1994 the units were reused in the Channel Tunnel as motor engines for TTU trains, and in 1995 they were converted back to standard SNCF Class BB 22200 locomotives. The locomotive 20011 was also produced as an HO scale model by two manufacturers.