Source : Webster's Revised Unabridged Dictionary (1913)

   (b) An apparatus for rapidly cooling heated liquids or
       vapors, connected with a still, etc.

   {Refrigerator car} (Railroad), a freight car constructed as a
      refrigerator, for the transportation of fresh meats, fish,
      etc., in a temperature kept cool by ice.

Source : WordNet®

refrigerator car
     n : a freight car that is equipped with refrigeration system