This (childrens) drama from 1975 popped up as a suggestion on Amazon earlier in the week, and I couldn't help myself. It's a story of the British people suddenly becoming fearful of any technology and destroying anything they perceive as "evil". The opening titles ( https://www.youtube.com/watch?v=oKT6RR88SkY ) have footage of rail representing technology. What intrigues me though is early in the first episode, as part of the destruction of technology, it briefly shows (library footage?) of sidings of rolling stock burning. I've seen footage of the Glasgow trams being disposed of through burning, but wondered if this was a method that BR/London underground used in the past to dispose of life-expired stock - or if it happened to be footage of an accidental blaze.