This engine was considered state-of-the art for two decades - inside the fameous Re 425

For two decades, the "Brownie" was the standard newer engines had to compete against when it came to tractive force. Developed specifically for pulling trains across the alps, this locomotive model has served for sixty years. However, its days are counted.
This is the story of the Re 425 a.k.a. Re 4/4 BLS a.k.a. Ae 4/4 II. A huge thank you to BLS for making this video possible!
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