I immediately thought Far North Line, thinking I recognised it from Wikipedia and chose a place at random. When you said it isn't up north, I don't know what made me say Quintrell Downs, but apparently random choices work!
Probably my best ever guess on here - beating
this one from
over a year ago (just

)!
Come back in a couple of minutes folks
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You will have to go on what you can see reflected in the poster on this one (and don't answer "Ivo", because that's not funny, or "Culham", because that's just plain stupid). Good luck
Note that this one has not been edited
at all (apart from being reduced to 40% of its original size as always and also being rotated by 90°).
P.S.: I have no idea what this poster is supposed to be indicating. Answers on a postcard please!