Excerpts from the report Introduction: During the past few years, several carriers have been experimenting with mechanically refrigerated railroad cars for hauling meats and packinghouse products; approximately 160 cars of this type are now in service. Several hundred mechanically refrigerated trailers have been introduced into "piggyback" (trailer on flatcar) service for hauling meat. Previously, only cars refrigerated with crushed ice and salt were used in meat movement by railroad; this type of car is still the most widely used. The test covered in this report was made on a movement of hanging beef between Lincoln, Nebr. , and Philadelphia, Pa. Two mechanically refrigerated cars and four mechanically refrigerated "piggyback" trailers were tested. Performances were measured in terms of temperatures maintained in the vehicles, fuel consumption, and refrigeration charges.