The bridge on the left looks like the Midland Road Bridge with it's big bottom chords supporting tapered floor beams. This is more evidence that the two bridges used to sit side by side.
Instead of big steel rocker bearings that support the bridge on the left, the bridge on the right sits directly on a reinforced concrete pedestal. Also one of the girders on the pedestrian bridge looks like it was struck by a passing vessel. This seems strange since the bridge on the left wasn't hit.
Great Britain: Sainsbury's Bridges (2) by Mark Yashinsky is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 United States License.