Hi. At the moment, priority is only valid for supply stations. The higher the priority, the more likely it is that this station will be a source of the resource.
Priority is set at the station itself, not at the dispatcher. It can also be set by a signal.
Priorities are not taken into account for request stations. Practice has shown that this will lead to the fact that stations with low priority sometimes do not receive the resource at all.
But there was already a request for such a feature. Perhaps I will improve it in the future. Now there is little time and there are other areas for improvement.