Standard Blue Livery Locomotive TOPS Numbering in white (3.5mmm high) Random numbersets and TOPS class prefixes, with Guidelines, for creation of TOPS loco numbersets for classes 03, 08, 09, 20, 24, 25, 26, 27, 31, 33, 37, 40, 44, 45, 46, 47, 50, 55, 56, 73, 81, 82, 83, 84, 85, 86, 87. - (Also authentic for original Parcels livery and 'Dutch' (Engineers') livery.) For Res (Rail express systems) livery, use sheet F7181