it is neither in underground or overground. it is a separate system.
Well the easiest way would be to use the London Underground. If it is imperative to use a train there is the London Overground Network. A link to the Underground/Overground rail network can be found below.
The London Underground (or just the underground)
There was too much overcrowding in central London to accommodate above ground rail lines into the city.
London Overground Rail Operations was created in 2007.
Electric traction motors in each car via a "3rd rail" feeding electricity.
none. The nearest thing is the "Luas" in dublin which is an overground tram, that or the national rail service
they call it that because it was underground and its was a rail road
what are 10 facts on the underground rail road
Harriet Tubman created the underground rail road.
tube is underground but rail is on the ground :)
Harriet Tubman was the leader of the underground rail road
No, the underground rail road existed before she started taking (used to be) enslaved slaves there.