October 7, 2014:
There's not a great deal of change up on the bridges, which support an abandoned railroad track. You can see some, but not multiple layers like on the more visible and accessible wall surfaces. There has, however, been a great deal of change on the supporting stanchions.
These are of the face of left-most stanchion on the railroad bridge (which is off the left edge in the upper photo):
October 25, 2006:
October 26, 2014: