A ship of this type would be an "enclosed conveyor system." The high cost would be worthwhile only if the ship could be fully loaded in both directions, with no ballast voyages.
Inqanawa yoluhlobo izakuba sisixokelelwano esifakelweyo sokuhambisa, ixabiso eliphezulu lizakulunga ukuba inqanawa iyalayishwa kakhulu kumacala omabini ingenamaplanga makhulu ekuhambeni