Something that is used by many modern-era freight car modelers, but seems unknown to most steam-era modelers, and of which I was only vaguely aware until Collinsville last month, is decal weathering for all kinds of streaking, from gray and black to rust. I bought a set of Weathering Solutions decals at Collinsville and have tried them out, leading to a blog post about the results. If you're interested, here is a link to that post:
Tony Thompson Editor, Signature Press, Berkeley, CA
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Publishers of books on railroad history