SNCF BB 20011 and 20012
| Company type | Prototype electric locomotives |
|---|---|
| Industry | Railway transportation |
| Predecessor | SNCF BB 22200 (units 22379 and 22380) |
| Founded | 1985–1986 |
| Fate | Converted back to SNCF Class BB 22200 in 1995 |
Area served | France, Channel Tunnel operations |
Key people | Alsthom (developer) |
| Products | Dual-voltage synchronous electric locomotives |
The SNCF BB 20011 and SNCF BB 20012 were electric locomotives developed by Alsthom during 1985–1986 as dual-voltage synchronous prototypes intended for the BB 26000 class. These units originated from modifications of SNCF BB 22200 numbers 22379 and 22380, serving to evaluate dual-voltage traction systems, microprocessor-based controls, and auxiliary variable-speed induction motors. Particularly, locomotive 20012 was utilized to test the combination of pneumatic and electric braking technologies.
In 1994, both locomotives were assigned to support operations related to the Channel Tunnel before being restored to their original BB 22200 class specifications in 1995.
Prototypes for SNCF BB 26000
Between 1985 and 1986, SNCF BB 22200 units 22379 and 22380 underwent modifications to function as testbeds for advanced dual-voltage traction equipment, microprocessor control systems, and variable-speed induction motors. The primary objective was to improve performance and dependability for the forthcoming production series. Specifically, locomotive 20012 focused on evaluating integrated pneumatic and electric braking systems aimed at enhancing safety and operational efficiency.
Role in Channel Tunnel Operations
In the year 1994, these locomotives were deployed as traction units for TTU trains within the Channel Tunnel. The TTU acronym denotes Transmanche (cross-channel) + TVM (Transmission Voie-Machine) + UM (Unité Multiple or multiple unit), highlighting their function as freight locomotives in this major international transport link.
Reversion to Standard Configuration
By 1995, both machines were converted back into standard SNCF Class BB 22200 locomotives to meet SNCF’s operational fleet standards.
Miniature Models
The model of locomotive 20011 has been manufactured in HO scale by Märklin and Roco, appealing to hobbyists and collectors in the model railway community.
External Links
- Images