I attached the screenshot the coal don't move in conveyour belts ...
(https://dl.dropboxusercontent.com/u/16887656/screenshot2.png)
https://dl.dropboxusercontent.com/u/16887656/screenshot2.png
Hmm If I remember correctly , don't you need an unloader at the end and a loader at the start with hoppers attached?
Items must be forbidden to get moved by the conveyor belts. This is fixed in the update I am working on at the moment.