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 thirty-six First Class 'double sausages' in deep blue and thirty-six No Smoking triangles in red.