This picture has a lot of potential. I think the most visually interesting part is the artwork, but you did not caputure it well, a different angle could give more inmpact and adding contrast and a bit of color saturation could bring the picture alive.
Nothing says urban city more than graffiti. I like the composition here and the way the wall leads the eyes through the shot. IMHO emphasizing more of the wall rather than the rail yard may have added to the shot's feel overall.
this reminds me of the wall by downtown St Louis with all the cool graffity.it looks like a more dramatic angle would really made this colorful wall pop out.