Perhaps of interest? "23 January 2019, Steam-age signalling: paying homage to rail signal boxes in the UK
By Joe Baker
As the UK rail industry modernises its signalling systems, the Victorian-era signal boxes scattered across its landscape are gradually being removed from operation. Exploring history highlights the key role that mechanical signal boxes have played through the years, but what does their future hold? "
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"After more than a century of faithful service, the last remaining signal boxes in operation are approaching the end of the line. In 2012, UK rail infrastructure owner Network Rail said it was intending to replace the remaining 800 boxes across the UK and migrate control of the entire network to twelve rail operating centres (ROCs).The future of boxes like Severn Bridge Junction may have been thrown into doubt, but the drive to keep the memory of these buildings alive continues unabated. "
https://www.railway-technology.com/features/rail-signal-boxes-uk/