On 25 May, 10:38, CJB wrote:
Is Haggerston really to the north of Dalston? Or have they made a
mistake? I think signs at other nearby stations may be the same.

http://www.flickr.com/photos/50503868@N03/4637990759/

CJB.

Whilst slightly confusing, the sign is correct. It doesn't generally
matter which compass directions the trains run, these diagrams usually
read downwards from the current location and can bare little relation
to the reality on the ground. Notice the Northbound trains at the top
of the sign (NB photoshopping a compass arrow onto the picture doesn't
help your case).