best colour for weathering black rio grande

[rambo1]

thankyou for the great pictures they will help alot.rambo1..

[Motley]

Rio Grande diesels are dusty from the surrounding Rocky Mountain scenery.

I used light tan color with my air brush. The trucks, tanks, etc. Also from mountain running, the dynamic break fan areas get rusted. Because it burns off the paint from the heat. I used rust weathering powders there.

Here's my SD45

Protype photo I was referencing.

[rambo1]

what is the right way to weather a black rio grand  50 or 60 i forget . What would you guys do first with a airbrush witch colours first ?rambo1.. notice I'm home from work for awile so i have lots of time on my hands lol .rambo1..