DGE-Railroad
The Orchard Line

I'm looking to add a bit more realism to some grey and plastic-y looking LGB bridges. Does anyone have any pictures of theirs for inspiration?
I've started the smaller 50600. I feel that's going okay because it's mostly wood-effect, which I've tackled before.
I'm struggling more to know how to start the larger 50610 as it's all 'steel' which is not something I've tried yet.
I don't want to do anything amazing, just stick with what I'm comfortable with; Ideally just airbrush some basic patches onto it, to get something like this


If there's a Tamiya colour that'd get me close to that, so much the better!
I've started the smaller 50600. I feel that's going okay because it's mostly wood-effect, which I've tackled before.
I'm struggling more to know how to start the larger 50610 as it's all 'steel' which is not something I've tried yet.
I don't want to do anything amazing, just stick with what I'm comfortable with; Ideally just airbrush some basic patches onto it, to get something like this


If there's a Tamiya colour that'd get me close to that, so much the better!