Thank you very much!
Peter, just imagine that it's a more modern all-welded construction. I don't think that this kind of construction uses as many rivets today. I may end up going the same route as you if the rivet decals don't work out. When I used them on the school project. I used water-based paint over top and the decals started breaking down. Now, I'll over coat them with Dull Coat to provide a water barrier before I apply the acrylic top colors and weathering.
I bought Woodland Scenics liquid scenery glue. It's pre-thinned for use with an eyedropper or spraying. It's not cheap either, but it's easy to use. I also found out that the area between the two tracks is also gravel so I filled in some of it to see how it looks. It looks fine. I also bought the Woodland Scenics Scenery paint starter set. I mixed some slate gray into the glue and then eyedroppered some down the middle of the inter track area. Since this would be a drainage area it would be a bit more weathered than the surrounding gravel. One of the pictures I saw even showed some vegetation growing in this area. It will be fun to add these details and bring the RR alive.