BR British Railways - Diesel Multiple Units (DMU) Multiple Working Symbols, Door & Window Graphics. The symbols provided in profusion are White Circle, Yellow Diamond, Red Triangle, Orange Star, Blue Square and Blue Square/Cream Slash, the latter provided as a two-part item, requiring the application of the cream ground prior to that of the split blue square. Door graphics comprise eight pairs of each - DRIVER, GUARD and PRIVATE in cream. For use on both multiple units and coaching stock throughout the BR system are First Class 'double sausages' in deep blue and No Smoking triangles in red.