#freight_car__freightcar  a railway car that carries freight
  supertype:  #railroad_car__car__railcar__railway_car__railwaycar  a wheeled vehicle adapted to the rails of railroad; "three cars had jumped the rails"
  member of:  #freight_train
  subtype:  #boxcar  a freight car with roof and sliding doors in the sides
     subtype:  #stockcar  boxcar with latticed sides; for transporting livestock
  subtype:  #cattle_car  a freight car for transporting cattle
  subtype:  #coal_car  freight car with fixed sides and no roof; for transporting coal
  subtype:  #flatcar__flat  freight car without permanent sides or roof
  subtype:  #gondola_car__gondolacar__gondola  a low flat-bottomed freight car with fixed sides but no roof
  subtype:  #refrigerator_car  a freight car that is equipped with refrigeration system
  subtype:  #tank_car__tank  a freight car that transports liquids or gases in bulk

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