Here are the applications for the various globe/bullseye colors: Fire Department Clear/White:  General Illumination Red:  Chief Engineer, or Danger/ Do Not Cross Hoses Blue:  Assistant Chief Engineer, or Volunteer Company Green:  Foreman Amber/Yellow:  Assistant Foreman, or Chief Hoseman Marine/Naval Clear/White: Anchor, Mast & Running Lamps Red:  Port Lamp Blue:  Captain on Board Green:  Starboard Lamp Amber/Yellow:  Running/Side Lamps Railroad/Highway Clear/White:   Hand Signals Red:  Stop/Danger Blue:  Rule No. 26:  Do Not Move/Men at Work Green:  Proceed Amber/Yellow:  Proceed at Reduced Speed, Prepare to Stop RED OVER BLUE:  Rule No. 67, Stop/Telegrams Awaiting Train