Excerpts from the report: Recent years have seen rapid improvements in the equipment used for transportation of perishable foods. New construction methods and better insulating materials have resulted in vehicles in which the refrigeration equipment can more effectively operate. Modifications and improvements in the basic means of refrigeration have resulted in more reliability and better efficiency in the systems installed in the vehicles. This report concerns a test of refrigerated vehicles, some of which had modified systems or improvements in the installed equipment. The test vehicles were two semitrailers, carried "piggyback" on a flatcar, and two rail cars carrying fresh lamb from Pueblo, Colo., to Philadelphia, Pa. Both trailers were mechanically refrigerated. One of the cars was mechanically refrigerated; the other was a water-ice car with a new system of forced air circulation. The purpose of this test was to evaluate the ability of refrigerated rail cars and trailers to transport fresh lamb at the recommended temperature of 32° to 34° F.