Tom Ditto, right, vice president of food service for Challenge Dairy Products, Inc., stands next to his company delivery truck, which is the test vehicle for a new type of refrigeration system that works on diesel and electricity rather than diesel fuel. Photo by David Castellon
Read more »Tom Ditto, right, vice president of food service for Challenge Dairy Products, Inc., stands next to his company delivery truck, which is the test vehicle for a new type of refrigeration system that works on diesel and electricity rather than diesel fuel. Photo by David Castellon