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it is neither in underground or overground. it is a separate system.
Berlin, Frankfurt, Stuttgart, Ulm, Nuremberg, Hamburg, Cologne, Kaiserslautern, pretty much every city in Germany with a subway system. U-bahn is the short form of Untergrundbahn, underground train.
The underground rail system - what Americans would call a subway system.
The underground rail system in London is nicknamed 'the tube'.
The London Underground (or just the underground)
what are 10 facts on the underground rail road
they call it that because it was underground and its was a rail road
There was too much overcrowding in central London to accommodate above ground rail lines into the city.
Harriet Tubman created the underground rail road.
Probably by British Rail and London underground. The nearest underground station to New King Road SW6 is Parsons Green.
Because she has saved 300 slaves during slavery using the Underground Rail road system.
tube is underground but rail is on the ground :)