02/08/1870 The world's first underground tube railway opens in London
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The History of The London Underground
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How the world's first metro system was built - Christian Wolmar
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London Underground celebrates 150th anniversary - Part 1 (BBC1 London coverage)
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Engineering the London Underground
In 1869 a 1,340-foot circular tunnel was dug through the London clay using a cast iron shield, an idea that had been patented in 1864 by Peter W. Barlow but never built. A 2 ft 6 in narrow gauge railway was laid in the tunnel and from 1870 a cable-hauled wooden carriage conveyed passengers from one end to the other.