In message , Dave Arquati
writes

I should make clear that it's not a *huge* drop - about three metres I
guess. It's also at the top of the current embankment - so I wondered
if the railway had been shifted slightly eastwards too to allow it to
drop downwards. Of course, it could just be something entirely
uninteresting! It just looks a little platform-like.

There are some photos that might help at:
http://www.subbrit.org.uk/sb-sites/s...ad/index.shtml

--
Paul Terry