Over the last few days I've done a little more work on the girders etc. that make up the bulk of the bridge. After posting about this previously I realised I'd missed out the bolts that connect the girders to the concrete block so these have now been added (a small piece of folded brass and more rod for the bolts) and then the whole thing painted.
On the real thing the plates are a lot darker than the girders which I've attempted to replicate. I'm fairly happy with how it looks although it will get a little more weathering when it's bedded into the scene to help tie the bits together.