This is a fascinating way of building real purpose into a model railway. I'm wondering if this system could be successfully be scaled down, without resorting to repetitive moves. For example, if you only had a limited number of wagons and 'wagon drops' how would you provide variety? Also, if you were short of a particular wagon type, would you then add that consignment to the next trip? Indeed, would this happen in reality, or would somebody make absolutely sure there would be enough wagons of a particular type available?
The reason I'm asking is that not everybody has the luxury of having such a large layout with many different locations, more often than not it's just one location or area plus fiddle yard.