Excerpts from the report: Rapid expansion in the movement of packaged frozen foods by refrigerated cars over great distances has brought problems in protecting the quality of the commodity in transit. Research on the temperature tolerances of frozen foods has indicated the necessity for maintaining 0 degrees F . or lower in-transit temperatures to maintain as closely as possible the inherent nutritive food qualities. The generally inadequate supply of the comparatively new mechanically refrigerated cars and the resulting use of many water-ice and salt cars in shipping frozen food have accentuated the problem of maintaining proper temperatures. This transportation refrigeration test was conducted to compare performances of two types of mechanically refrigerated rail cars and a standard water-ice and salt refrigerated car hauling frozen corn from Waseca, Minn., to Jersey City, N.J. Performances are measured in terms of precooling times, air and commodity temperatures within the cars, and ice, salt, and fuel, or out-of-pocket, refrigeration costs.