Automatische Übersetzung. Originaltext in: EN - Original anzeigen 85x units from this series were built between 1975 and 1980 based on the Re 6/6 11603 - 11604 prototypes.

They very quickly became the standard serious heavy freight traction across Switzerland, not just on the Gotthardbahn but also elsewhere, such as on the oil traffic through the Rhône valley. They were also used on passenger trains, but were never equipped for push-pull operation, on account of their immense power being deemed far too excessive to safely push a train! / Quellen: https://europeantraction.com/sbb-cff-ffs-re6-6/