All disused London Underground stations are connected via ghost trains that traverse conceptual topography. It's called the Abandoned Line.
London’s Abandoned Line is in a state of perpetual Cold War with Metro 2, the secret parallel underground system in Moscow which was used to transport Party officials around the place. One of the many ideological differences between Metro 2 and the Abandoned Line is the very question of Metro 2’s existence. The Abandoned Line insists that Metro 2 exists. Metro 2 itself stubbornly denies this.