I am confused by the Depot signal as well. I use a bunch of trains of scheme F, which is
1 Refuel
2 Park Position
3 Demand
4 Resupply
My Idea was, it getting fuel, parks to have as high reach as possible to unload, immeadiatly reload and then either refuel if need be, drive back to a demand station or non of any go to parking. But the trains stop at the supply station and blocking any other trains to restock - and basically nullifying any of my parking positions.
I initially used enable/disable stations to direct trains, but due to the mod, also put the train limit to them - which never resulted in any of my expected behaviour. Unless i misunderstood something, this is not supposed to be?
Only seem to work once, when the train wants to leave the re-supply station, all other 3 stations are either skipped or limited. Manually checking and unchecking the "enable/disable" flag of the demand station triggers the train to move to the deposit.