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There is a full history of how this map was simplified repeatedly. If you need proof, look at this pre-Overground map to scale and this semi-scale map of the modern system. Epping (the present eastern terminus of the Central Line) and Heathrow (the western loop of the Picadilly Line) are a long ways away from London. Heathrow is about 35 miles from central London. I'm a horrible subway junky. I've been collecting maps since I was 9 (I'm 38).