Sorry to burst your bubble here -- but the railroads were doing exactly that since the days of refrigeration via blocks of ice. ( http://californiabountiful.com/features/article.aspx?arID=56... )

> Now retired after more than 30 years in the produce business, Wolf noted that farmers began growing iceberg lettuce in the region just prior to the 1930s. The demand for the hearty lettuce variety soon took off through the use of refrigerated rail cars.