The shortest-route problem is a special case of the transshipment problem while transportation problems prevent shipments from entering and exiting some nodes, the transshipment problem does.
Transshipment is the loading and unloading of goods and stuff from one transport vehicle to another vehicle.
Transshipment happens because of no direct connection between the ports, due to this the goods are transported to different vehicles.
Thus, while transportation problems prevent shipments from entering and exiting some nodes, the transshipment problem does.
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