It's the number of car spots, not necessarily the number of industries that determine the operations potential. A single large customer, say a bakery supply warehouse, could have spots for boxcars, covered hoppers with flour to be rebagged on site and tank cars with vegetable oil needing to be placed in the proper spot. You go with a bulk terminal, it's the same car types going in the same spots, unless you went with something like a corn syrup terminal which is spotted by grade. A transloading facility allows a car with something like plastic pellets to be off-loaded in to a waiting dry bulk trailer. Next day it could be a flatcar of lumber being loaded onto a waiting flatbed truck. It's like a super-charged team track...
Jeff