Moving fruits, vegetables or meats across the country raised a problem for the railroads. If the product was not kept at a proper temperature
the product would deteriorate and not accepted by the buyer when it arrived at his door. The answer was to have ice blocks dropped in
hatches on the corners of the roof to keep things cool. Maybe several times they would need re-icing along the way from the west coast to back east. 
They made a move to make ice reefers out of steel instead of wood which was smart but they still needed icing after several hundred miles.
The small doors kept cold loss to a minimum.
Next came the mechanical reefer as you can see the attachment on the end of the car that kept things cold.
This relied on the motor and fuel for the long journey, if not, the product spoiled and became railroad property.
They finally went to Cryo gas that was a lot more reliable as it only lost a few degrees temperature
for the long distance it traveled. I'm no expert on this stuff so I may have quoted something wrong.
I'm sure someone will be writing back on this.
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