#steamship__steamer  a ship powered by one or more steam engines
  supertype:  #ship  a vessel that carries passengers or freight
  part:  #steam_engine
  subtype:  #paddle_steamer__paddle-wheeler  a steam vessel propelled by paddle wheels
     subtype:  #side-wheeler  a paddle steamer having a paddle wheel on each side
     subtype:  #sternwheeler  a paddle steamer having the paddle wheel in the stern
  subtype:  #tramp_steamer__trampsteamer__tramp  a commercial steamer for hire; one having no regular schedule

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