It’s been a while since I worked on this, but we’re getting there.
Yesterday, I glued static grass to the sides of the road, and tonight, I sprayed dark lines along the road and down the middle of the railway track to represent oil, dirt, grime etc. I then painted the tops of the rails with Humbrol Polished Steel (after masking the wooden beams that form the crossing) and buffed it with a cloth.
I’ve also built and painted the barriers:
These are loose, and will remain so because that will allow me to store this much more reasonably than with them glued in place. They will also remain workable (more or less) so I can pose them up or down as needed.