In message , at 22:13:14 on
Fri, 28 Jun 2013, Paul Corfield remarked:
Quite why a sign and "straight ahead" arrow has not been shown on the
sign which points you to the stairs I don't know.

Often this sort of situation (and not especially rail-related) is
because they don't actually want people to use the lifts (they'll wear
out faster, and people will complain if they break), the installation
being merely to tick a box on a form somewhere. A lot of cycling
"facilities" are in the same category.
--
Roland Perry