what are its different types?
Container ships and bulk carriers
Cargo ship
Specialized types of cargo vessels include container ships and bulk carriers 
what is ss minnesotan? A cargo ship who/what is responsible for its design? UNANSWERABLE what is the former mentioned kind of ship? A merchant ship that carries cargo, goods and materials from one port to another
wiki:17811978
Cargo ship [SEP] Specialized cargo ship types
Specialized types of cargo vessels include container ships and bulk carriers (technically tankers of all sizes are cargo ships, although they are routinely thought of as a separate category). Cargo ships fall into two further categories that reflect the services they offer to industry: liner and tramp services. Those on a fixed published schedule and fixed tariff rates are cargo liners. Tramp ships do not have fixed schedules. Users charter them to haul loads. Generally, the smaller shipping companies and private individuals operate tramp ships. Cargo liners run on fixed schedules published by the shipping companies. Each trip a liner takes is called a voyage.