Martin Underwood wrote:
Tristán White wrote in message
45:

I took this photo:

http://www.flickr.com/photos/25124954@N00/480556440/
#comment72157600218892777

Can you guess...

(a) where it is
(b) what it's for?

I know the answer to (a), of course, but would love to know the
answer to (b) as it confuses the hell out of me whenever I see it.

As you can see, other people I asked have no idea. So I thought I'd
ask on UTL ;-)

The "Keep Clear" suggests it's the emergency exit from something.

I've never had a close-up look, but none of the "edges" look like they open.

Is the
bottom horizontal handle at floor level?

Yes.

And is the top of the photo near
ceiling height?

Not especially near, as I recall.

Is this leading off the platform or off one of the access
tunnels between surface and platform?

Come down the Northern escalator at Warren Street, and right in front of
you are two foot tunnels, one on the left and one on the right. This is
the wall between them.