Something funky going on with caravans on PTR.
https://screeps.com/ptr/#!/room/shard2/W0S20 tick 19029510
Caravan creeps with no owner that aren't visible (but are clickable) on the room view, but are visible on the map view.
Upon further thinking I've decided I quite like how I think it works. It emphasises territory control (something players have requested) as you need to be able to harvest the entire 19 "bus" rooms of your sector to be able to set up a proper deposit farm and managing your farm requires quite a lot of effort and has multiple strategies. These strategies extend into the factory design - high tier commodities need fewer deposits and more power levels.
