Hey Steve. Agree that the cylender weathering is something else - the dusty/rusty cylinder front seems to be something that seems a feature of LM/LNE region locomotives - I've attempted it with earthy/rusty pigment. Grey Pigments are also Ideal for getting the spilled ash under the smokebox / fly ash around the ash pan - I've also hit the ashpan sides with rust pigments, and generally give the lower part of the model a dusting with earthy tones... from above I use greys/ blacks to represent falling cinders. These are done dry, so wear gloves to avoid finger prints, and over spray with light coats of varnish to avoid blowing the pigments away! remember too, that the effect after varnishing will be far more subtle than the dry pigments suggest: while I've often managed with a single application, with the A5 I ended up going over it again. I do paint rods with a metallic black/steel enamel -Unfortunately Nickel Silver is normally a little too yellow for my taste- I then go over them using the Mr Hobby, Mr weathering oil based washes - a black/brown mix on the rods , but have a full range of colours which can be very useful: there's more than a few loco's that have a trace of sand around the sand box lids and the WD shows signs of a leaky cylinder gland nut, courtesy of a little grey wash on the crosshead! I also use a some satin/gloss varnish to represent older oil and full gloss for water/fresh oil ( you can also simulate dried overflow from tank fillers by hitting the pigment with brush dampened with a little thinners) You can also spray the Mr Hobby washes too - its a quick way of getting road dust onto them, but I do like the gritty/dusty look that the pigments give, anyways have fun with it, looking forward to seeing the result