The extension to Heathrow Central is shown as being under construction, opening late 1977. Title of map:'London Transport - Diagram of lines - Number 3 1977 [9.77/2680M/750,000]'. London Transport - Diagram of lines - Number 3 1977 [9.77/2680M/750,000].
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It was not reopened until 2008 as part of the Overground network. 'London Underground Transport - Railway Map No 1. Title of map:'London Underground Transport - Railway Map No 1. DATE PRINTED: No.1 1936.
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Title of map:'London Transport - Diagram of lines - 1965 [165/184Z/1,000,000]'. London Transport - Diagram of lines - 1965 [165/184Z/1,000,000]. The image below shows an enlarged cross section from the centre of the map to show the level of printed detail.
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The front cover has details of places of interest and theatres on red linen with a card backing. It was not reopened until 2008 as part of the Overground network. 'Map of London's Underground Railways 1931'.
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Title of map:'London Transport - Diagram of lines - 1958 [858/1783M/500,000 (R) or 158/51M/250,000]'. London Transport - Diagram of lines - 1958 [858/1783M/500,000 (R) or 158/51M/250,000]. The image below shows an enlarged cross section from the centre of the map to show the level of printed detail.
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Title of map:'London Transport - Diagram of lines - 1966 [866/2378Z/500M (R)]'. London Transport - Diagram of lines - 1966 [866/2378Z/500M (R)]. The image below shows an enlarged cross section from the centre of the map to show the level of printed detail.
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It was not reopened until 2008 as part of the Overground network. 'London Underground Transport - Railway Map No 2. Title of map:'London Underground Transport - Railway Map No 2. DATE PRINTED: No.2 1936.
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The image below shows an enlarged cross section from the centre of the map to show the level of printed detail. This map is folding hence the centrefold line may show on the image below DATE PRINTED: 1939.
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