Mike Jee,
Well done for spotting the unfinished railway viaduct connection near Curzon Street. If I were a betting person I would stake a penny or two on the viaduct never having been completed. In the few last years I have strolled around the area, and moreorless satisfied myself that the last few spans could not have put in because I could find no trace of the supporting brick piers, while there is still evidence of other building on the site.
Peter