The Underground, Subway transport system in London, United Kingdom.
The Underground is a rail transit network serving London and surrounding regions through an extensive network of tunnels and stations. Trains operate throughout the day and into the evening, moving millions of passengers across interconnected lines.
The Metropolitan Railway opened in 1863 as the world's first underground railway, operating steam locomotives and gas-lit wooden carriages. Gradual expansions and electrification transformed it into the modern network seen today.
Harry Beck's 1931 map design changed how the world visualizes public transport through its color-coded lines and geometric approach. Travelers still encounter this influential design at every station and inside each train today.
Riders can use Oyster cards, contactless payments, or paper tickets to access the system. Service runs from early morning until evening, though specific times vary depending on which line you use.
During World War II, many stations became public shelters, providing refuge for thousands of Londoners during air raids. These underground spaces became centers of community life during the city's most dangerous nights.
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