This might be me being dumb, but I have a fluid station requesting molten iron. The train limit is set to 3. I'm not sure if this is an intended feature but while a train is currently fulfilling the request, LTN checks to see if the request threshold is being met and requests another train even though the train hasn't finished unloading. This means that a train will come to a station that is already filled up. Any help will be appreciated :)