From #openttdcoop wiki
The idea of this concept is to have different people (or groups thereof) manage different parts of the map with focus on different goods. These parts are connected via a transfer terminal with the ML where they exchange goods and are brought to their final destination. It requires some kind of role-playing, some general manager to plan the ML layout and co-ordinate. Very well playable also with a track sharing patch.
This is untested yet but goes in the direction of wwottdgd.