As part of my effort to keep the troops supplied I have lots of box cars in my collection. While I primarily collect Southern Pacific, I also have some others as well.
Many of our most famous meat packing companies have been operating out of Chicago for over a century. The cowboys took cattle to the railhead and they were trained to Chicago where they were butchered and set to the folks back East in iced cars. They would insulate a special box car and then pack ice in from the top to keep the meat fresh.
In the Second World War there was meat rationing and so much of the meat went to the boys in the service. Sometimes fresh, sometimes frozen and often packed in little bitty tin cans.