Experiences With The Prototypes
Intense trial runs were made with the prototypes. They had bogies with fixed axles, which led to heavy rail and wheel flange abrasion. Despite some early technical issues, the SBB-CFF-FFS were convinced they were on the right path with the development of the Ae 6/6. After introducing side-elastic wheelsets and making the wheel flanges of the middle axles smaller, the series production started in 1954, resulting in the first series locomotives delivered in 1955.
Read more about this topic: SBB-CFF-FFS Ae 6/6
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