Thanks for the reply. It is not clear what I am looking for but there are bi-directional red arrows on the track under the loader building (there are also lots of rotating dashed circles on the tracks that don't seem to do anything). When I click on it with the '?' I get a coal icon. There are things inside to click such as loading 1 car at a time, various rates (presumably of coal), how much to load per interval etc. Since I don't know what to set them to or even what the units are (tons?) I guessed. However, I there still must be some magical setting that makes it work. When the train drives through the loader, it stops for each hopper as expected but nothing else happens. At least it would appear I am getting the script right just not the interactive industry.