In 1859 Thomas Webster Rammell and Josiah Latimer Clark proposed an underground tube network in central London "for the more speedy and convenient circulation of despatches and parcels".
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In 1854, he took out a patent "for conveying letters or parcels between places by the pressure of air and vacuum," and later, in 1863, was concerned in the construction, by the London Pneumatic Despatch Company, of a tube between the London North-West District post office and Euston station, London.