Updates
European standards will become increasingly demanding in terms of the requirements for particulate emissions and also the amount of CO2 emitted. These new guidelines will be implemented in two stages, taking place in January 2009 and in January 2012.
To comply with the first set of standards (January 2009) all new locomotives of this type will be built with a new diesel engine: the MTU 4000 R43. As well as engine modifications, the locomotive's exhaust will be changed (many locomotive manufacturers are implementing new exhaust systems to reduce emitted particulates). This will change the external appearance of these locomotives. All new locomotives built thus will be numbered from 200 onwards, i.e., BB 475200 and upwards in number.
Read more about this topic: SNCF Class BB 75000