I don't know the answer to your question, but I will just add that I have been at this hobby, and weathering for a very long time. I have learned more in the last ten years about weathering from a late friend who, in addition to trains, modeled WWII armor and aircraft. He introduced me to Vallejo and other military modeling materials, and to techniques used in that world. There are many YouTube videos from masters of military modeling.
I have spent a lot of time studying and experimenting with those approaches, adjusted for scale and lighting, etc., and have been very pleased with the results.
To echo one of Ben's maxims, weathering done well cannot be quick and easy, in my opinion.
And I love Jack Delano's photography! I just don't know how to get there under Cool White fluorescent lighting. :)