For the SBB Rail 2000 project, the BBC and SLM produced four prototypes of a four-axle electric locomotive designed in light steel. The locomotives Re 4/4 IV designated by the SBB were intensively tested as of 1982. With the 160 km/h fast locomotives, not only the new rectifier technology was tested, but also new color schemes â all four machines received different finishes. Only from 1986 did Re 4/4 IV receive a uniform color scheme in traffic red with the Railway 2000- advertising. From 1994 onwards, the South East Railway (SOB) took over the locomotives guided as Re 446 and made them rolling advertising boards. With the introduction of the Stadler Flirt at the SOB in 2019 all Re 4/4 IV were sold to EDG.This text is machine translated.