The Ghost Overground was created on 2008-08-05.
Overground - song - was created in 1978.
London Overground Rail Operations was created in 2007.
overground x x
it is neither in underground or overground. it is a separate system.
This question is not specific, there are some regions that have the Overground services while there are other places in the world that do not have.
The Ghost in You was created in 1984.
The Ghost in the Machine was created in 1967.
The Live Ghost was created on 1934-12-08.
Ghost Soldiers was created in 2001.
Oliver's Ghost was created in 2011.
The Ghost of Cain was created in 1986.
Anatomy of a Ghost was created in 2002.