Standard Blue Loco Livery Elements including TOPS numbering (2mm high), data panels, double arrows and later red/white overhead warning flashes for Classes 03, 08, 20, 24, 25, 26, 27, 31, 33, 37, 40, 44, 45, 47, 50, 55, 56, 73, 81, 85, 86 & 87. Photograph courtesy of Mr David Briggs.