London Underground poster vegetables roughly circular tunnels were dug

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London Underground poster vegetables roughly circular tunnels were dugThe London Underground (usually known by its nickname "The Tube" because of the circular tube like tunnels through which the trains travel) is a rapid transit system serving Greater London It opened on 10 January 1863 as the world's first underground passenger railway The first tunnels were built just below the ground, but later, smaller, roughly circular tunnels were dug through at a deeper level. The schematic Tube map, designed by Harry Beck in