Try to find the spot where the photographer was standing.
10 July 1914 was a Friday; about midday, judging by the long winter shadows - I can't see a convenient clock!
Streetview - goo.gl/maps/rabNBth6z5M2RHNx9
Knowing that JJC Bradfield had a habit of appearing in later photos of the Harbour Bridge construction, I wonder if that is him in the spot where the railway was eventually built, standing still and looking at the camera? See note.
This is one of those photos you'd love to step into.