Yes, the curved track for the evacuation system is permanent.
The other thing you might be seeing is the "crawling" catwalk that crawls up the side of the structure. At the base of each tall tower there are these small vehicles with huge legs that sprawl out in four directions about 20 to 30 feet. From there, there are a series of 3-foot square by 5-feet high "track" sections that connect in series all the way to the top. A wide scafold, which looks similar to a high-rise window washer platform, travels up the thing. Look here at the base of the towers to see what I mean:
http://www.guidetothepoint.com/thepoint/gallery/img.asp?img=h-mfconst51.jpg
Anyway, that thing is temporary.
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Jeff
Webmaster/Guide to The Point