East Coast Line
From Tardis Wiki, the free Doctor Who reference
The East Coast Line was a railway going along the eastern coast of Great Britain. It went through Darlington, Newcastle and Edinburgh.
In 2011, Barbra was assigned by MIAOW to investigate a supernatural creature causing trouble on the East Coast Line. (PROSE: Enter Wildthyme)
Behind the scenes
Location information
Though it's possible that a real world location doesn't exist in the same geographic space in the Doctor Who universe, such cases are few and far between. Thus, the map to the right is probably a good indicator of the DWU location of East Coast Line.