After finishing the tan paint/ground cover work on the city perimeter, I fastened the crossing fillers in between the rails with hot glue. I went this route simply because it cures instantly. I then mixed up what-I-thought-was a matching gray to finish the roads and went about painting the remaining bare plaster.
Hint: if I did this again, I would paint the filler pieces BEFORE gluing them in. As it is, I have a lot of post-painting cleaning to do. For the remaining crossing leading to the train station I didn't make this mistake. I was a little over zealous.
The track in general needs a good cleaning everywhere due to spray glue from landscaping, plaster and now gray paint.
I also painted the edges of the roads that abut the table edges "Jungle Green", which in some cases shows the flaws of my plastering. Most people will not notice this.
My gray paint mix wasn't a good match. As it dried it became even lighter. Now this is a bit tricky since I had also airbrushed black down the center of the roads before I installed them on the layout.
I was rushing this today. To remedy it I'm going to remix the paint and try again and then use weathering powders to try and duplicate the airbrushed portion. I don't want to airbrush directly on the layout for two reasons, 1) it would be difficult to mask just the rail heads, and 2) it would blow ballast and ground cover every where. If the weathering powder doesn't work, I may airbrush after all.
I may not get build time tomorrow, but the next step will be to finish up the road detailing and paint the road in the back, I'll then add some more variety to the ground covering in the back before starting on ravine #1. Once ravine #1 is done, the only access to that back area is underneath.