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Wikipedia: A rapid transit, metro(politan), subway, underground, or elevated railway system is an electric passenger railway in an urban area with high capacity and frequency, and which is grade separated from other traffic. Rapid transit systems are typically either in underground tunnels or elevated above street level. Outside urban centres, rapid transit lines sometimes run grade separated at ground level.
![[Interior of a Helsinki Metro train]](http://images.ookaboo.com/photo/s/Helsinki_Metro_train_interior_s.jpg "Interior of a Helsinki Metro train")
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![[A picture of Rapid transit]](http://images.ookaboo.com/photo/s/NS_93_2C_Metro_de_Santiago_s.jpg "A picture of Rapid transit")
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 from :fi:Käyttäjä:Lussmu |
 from Ariel Cruz Pizarro |
![[A Phase II broad gauge train, supplied by Bombardier, on the Delhi Metro.]](http://images.ookaboo.com/photo/s/D_M_s.jpg "A Phase II broad gauge train, supplied by Bombardier, on the Delhi Metro.")
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![[R46 stock of the New York City Subway remains in service in 2010 since its 1975 launch]](http://images.ookaboo.com/photo/s/NYCSubway6028_s.jpg "R46 stock of the New York City Subway remains in service in 2010 since its 1975 launch")
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 from Kakanana87 |
from AEMoreira042281 |
![[The Paris Metro runs mostly underground.]](http://images.ookaboo.com/photo/s/Wagon_isol_C3_A9_C3_A0_Place_d_27Italie_s.jpg "The Paris Metro runs mostly underground.")
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![[1996 stock at St Johns Wood on the London Underground, the oldest rapid transit system in the worldWolmar 2004, p]](http://images.ookaboo.com/photo/s/1996_stock_at_St_JohnsWood_2_s.jpg "1996 stock at St Johns Wood on the London Underground, the oldest rapid transit system in the worldWolmar 2004, p")
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from Romanceor |
from Oxyman |
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