There are also a fair number of colour light signals in Cornwall, some, more remote from the surviving boxes, directly switched from the same mechanical lever frames that operate the local semaphores. As major station layouts were simplified, spare levers in large frames were freed up which allowed neighbouring boxes to be closed and new facilities added using the spares and spaces. This happened at Truro, where the new Penryn passing loop points and colour lights were cleverly added to the existing, relocked frame. Other colour lights are operated by switch panels installed supplementarily alongside, or completely replacing, the old levers in the same box. Penzance has been totally colour light for decades, but is still all controlled by levers. So, it's a real mixed bag of technology ranging from the original buildings and frames to the latest digital techniques, including axle counters and additional LED colour light signals of the latest types, installed recently to improve capacity. The semaphore and mechanical elements are of course very much a 'Triggers Broom' affair (or 'Ship of Theseus' if you prefer your references more classical), with the majority of parts renewed many times over the decades, either like for like, or modified and configurations modernised, as layouts were altered, standards changed, and certain components become obsolete or difficult to obtain. All remaining semaphores are now electrically illuminated using LEDs today for example, saving the frequent filling and trimming of the oil lamps of old. I could envisage some more piecemeal small-scale control centralisation taking place in the coming years to make incremental operational cost savings, rather than wholesale transfer to a major control centre, wheresoever located.