Have found the answer to a question that has until now been unanswered and therefore plauging me for sometime. I have been searching for a way to make a factory smokestack smoke. Now in this day and age, people are trying to get things and people to STOP smoking. Bt Me ? nosiree - I want my stacks to smoke, especially the ones I am making for my route. It is based on the 30's and during that era, everything smoked.
here's the link to the smoking stack...if you click the image, photobucket will animate it for you - just the way it appears in MSTS. By the way - was having a bit of trouble with my recording software, but this will give you the general idea.
OK OK - Here is how I did it http://hecrowell.spaces.live.com/default.aspx