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Gravel roads are just done using 2 types of sanded tile grout. The base layer in a beige colour, followed by a light grey top coat. The ruts and tire wear effects are rubbed in using the handle end of a small paint brush. I do this before sealing with scenic cement, but you could also do it after ... It exposes the beige base layer for a nice tire track effect.
That’s Nn3? Wowzers, that’s amazing, Paul.Otto
Jim - I think you’re right about the typical narrow dirt road only showing 2 tire tracks, but some of the wider “improved” dirt roads I’ve encountered do have a 2 lane road appearance, but more like 3 tire tracks with the center track being a wider looking track.However, we’re getting really esoteric here. But, it is the Railwire after all.
The intention was for this to be a 2 lane gravel road so basically the width of a secondary highway but not paved. In this part of Western Canada they commonly run along Township and Range lines in a regular grid.
Common practice in the western US states as well, so there you go. Lots of dust accumulated on our cars from traversing these kinds of roads chasing trains. For that matter you're fortunate if they're gravel, usually just graded.
Are you going to model the destroyed crane boom when it tries to make that lift which is clearly beyond the lifting capacity of that crane?
...and then there is New Zealand where it often feels like the primary highway network is little more than winding two lane gravel roads