
Visiting signal boxes is a rare treat that gives you a real insight into how Victorian technology is still safely controlling many parts of our national rail network, so it was a rather special day (25 November 2025) when I was kindly invited by Network Rail to visit the Isle of Anglesey’s five historic signal and gate boxes.
Over the course of the final 21 miles of the North Wales Main Line, from Llanfairpwll to Holyhead, this quintet of boxes includes three Grade II-Listed structures at Llanfairpwll, Ty Croes and Valley, along with a LNWR box dating from 1882 at remote Gaerwen and a large LMS box at Holyhead, which is youngest of all, and only dates from 1937.


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