True, but these feeders are quite numerous and there could be 10 anyways for each large sea going container ship on a global average. And they would be working

True, but these feeders are quite numerous and there could be 10 anyways for each large sea going container ship on a global average. And they would be working constantly to bring capacity out from larger ships anchored in bays and bring it up rivers or canals. So it's a good start though. From looking at its design this one is mostly for river use or litterol water operation.