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The electrification of the London Midland Region main line between London, Manchester and Liverpool at 25KV AC, using overhead wires and drawing supply from the National Grid, was a major undertaking involving civil, electrical, mechanical and signal engineering of a complex and advanced nature. This film depicts some aspects of the problems involved and of the unprecedented operations which were carried out.
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26 minutes on YouTube (the archival version I found), but 27 minutes as listed on IMDB/TMDB. I suspect PAL/NTSC shenanigans. ---- I'm such a sucker for big infrastructure projects, _especially_ when they're carried out with little to no impact on ongoing services. When playing e.g. supply-chain/logistics games (_Factorio_ or similar), I often try to make improvements in the same manner: Plan ahead, build or change whatever I can, and interrupt the existing flow of items as briefly as possible. I'm such a nerd. 😁