Automatische Übersetzung. Originaltext in: EN - Original anzeigen In 1969, the Swiss Federal Railways (SBB CFF FFS) commissioned the development and manufacture of a new Bo’Bo’Bo’-locomotive. It had to be the faster and more powerful than its predecessor, the Ae 6/6 electric locomotive.

The new locomotive is built by the Schweizerische Lokomotiv- und Maschinenfabrik (SLM, now part of Stadler Rail) and Brown, Boveri & Cie (BBC, now part of ABB).

At the time, the main requirements were that the locomotive had to be able to pull a 800 tonnes train, at a constant speed of 80 km/h, up a slope of a maximum of 26 per mille. The locomotive also had to be able to round the tight 300-meter curves over the Gotthard pass with a speed of at least 80 km/h.

These requirements resulted in a design with three two-axle bogies, with one traction motor per axle. The Re 6/6 power rating is impressive: 7.850 kW at 100 km/h.

4x prototypes are initially built:
- Re 6/6 11601 – 11602 with a 2-part articulated body, interconnected by hinges;
- Re 6/6 11603 – 11604 with a uniform body, a more simple and cheaper solution. / Quellen: https://railcolornews.com/2018/09/18/ch-the-new-re-6-6-for-railadventure-its-first-days-of-service/

Automatische Übersetzung. Originaltext in: EN - Original anzeigen A total of 85 locomotives are finally ordered based on the Re 6/6 11603 - 11604 prototypes.

These units enter service between 1975 and 1980 and are registered as Re 6/6 11605 - 11689. / Quellen: https://europeantraction.com/sbb-cff-ffs-re6-6/

Automatische Übersetzung. Originaltext in: EN - Original anzeigen The 2x units from this series are sold to RailAdventure (RADVE) in 2018 where they are registered as Class 420. / Quellen: https://railcolornews.com/2018/09/18/ch-the-new-re-6-6-for-railadventure-its-first-days-of-service/