Thursday 11 June 2009 7.37pm
I recently saw the NYTimes article on the Highline park being opened this week, so good timing.
I'm currently taking photos of the underside of bridges (location scouting for a low-budget short film) in the area, and was wondering the same thing. There are certainly disused areas by the sides of some railway and other bridges, but would be curious if there are things similar to the Highline.
I dont know if the people at http://www.hiddenlondon.com/
or the Museum of London might be helpful, but its worth an ask.