If a hog is taken from the farm to the plant, it is simply put in a truck. When the product leaves the plant and goes to a store it is taken on a truck that has special refrigeration. This is to keep the meat in cool temperatures so that it does not spoil. About a century ago, pork was taken in a horse-drawn wagon. Then with the advent of railroads, trains were used to move hogs.
Trucks are now the main way to move hogs.
Once the pork is sold, it generally ends up in the meat rack at your local grocery store. When you go to buy pork, make sure you look at it well. Check the date on processed products which are usually in plastic packages or boxes. Also look at the color and the smell of fresh pork to make sure its not spoiled. With processed pork, labels always appear on the product wrapper.