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underground |
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undergroundRail service that runs underground. The first underground line in the world was in London, opened in 1863; it was essentially a roofed-in trench. The London Underground is still the longest underground system, with over 400 km/250 mi of routes. Many large cities throughout the world have similar systems, and Moscow's underground, the Metro, handles up to 6.5 million passengers a day. |
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