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A Pallet Shuttle Barge or PSB is a cargo ship designed to operate on inland waterways for the transport of goods on pallets or in big bags. It is a type of catamaran with two parallel hulls supporting a vast cargo deck. It was designed to offer a competitive alternative to freighter trucks to reduce traffic congestion and carbon emissions. One PSB has the same loading capacity as 10 cargo trucks cutting carbon emissions by a third. Compared with traditional freighters the PSB also offers a number of advantages: