Due to everyones overall positive feedback, I will try to convey how this effect was achieved. I do not take credit for this method, I just like the end result. I first give a grimy coat of acrylic {floquil} based paint and let it sit for 2 or 3 days. Once cured, I hit it with a wash of water soluble oil paint available at art supply stores {It'll last you forever}. In this case I used Raw umber. I actually purchased a few other colors such as raw sienna etc. Once the wash was dry, I added more oil paint full strength- kind of a dry brushing/stippling effect with a short haired brush. The stippling effect will create texture in the oil paint. I then use regular old pastels that I scrape on a piece of sand paper and let the powder fall easily into the stippled oil. At this point you wanna let it sit for 10 -15 minutes and then BLOW the excess off so as not to disturb the still wet stippled rust texture. I then wait 24 hours and care fully use a wash of the oils to blend everything together. One other thing-do the above technigue on the trucks, wheels and and a really dilute wash for the coupler. It takes a bit of experiment but it's really not that hard. Have fun and let me know how it goes.
Stuart
Stuart