British Railways coloured Signalbox Diagram CAERPHILLY dated June 1951, linen has almost come away. Together with British Railways coloured Signalbox Diagram, NELSON & LLANCAIACH, dated 20.8.65 measures 115. Linen coming away. Additional, office copy Signalbox Diagram, LLANBRADACH dated 13.4.62 plus a similar ABER JUNCTION dated Feb 1969 and Bargoed North Junction same date.