Nono I mean between A-B, being any of the two lines (mine-factory or factory town), you do sth like this:
and create two lines, A-S and B-S, S being your own stop in the middle of nowhere. the goods will then be twice charged, from A to S and from S to B, plus charged more than a simple A-B if S is further away. See what I mean?
Edit: in my current game, I am making 1.2 mil instead of 300k out of a wood chain line using this trick.