Did you at some point consider cropping some of the bottom off (to about 1/2 inch below the foot of the viaduct)? To me that makes a more balanced image. I quite like the strong line of the viaduct, and the stark contrast in dark and bright areas. An interesting photograph!
This negative is only about 3 hours old. I have only had time to process the film and scan this negative. It is at this point full frame and I haven't yet considered cropping. But thanks for the suggestion, you may be right that the foreground does not add much.
As for DiXactol, I have only recently started using it, but I love the acutance and detail it produces, although those traits don't necessarily show in this image.