Think of the Tube, and the first image that enters your mind is the red and blue circle and bar roundel. It’s used everywhere on the trains, the maps, the tickets, the walls… But that’s just the start of it. Dig around the Transport for London web site and you’ll come across its excellent Station Products Guide PDF, which specifies everything from the platform-end fences that stop you getting electrocuted, to the channels screwed onto the station ceilings to keep the cables out of the way.
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