The best way to learn weathering is to study the prototypes. You get to see how nature affects the railroad rolling stocks. The closeups of the rust and graffiti on the boxcars and oil tankers, I had taken on my visit to Bellows Falls,VT should help me in my next project.

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Topics on weathering previously posted here:
1. Model Trains Weathered Forum.
2. My first attempt weathering.
3. Bragdon powder weathering.