Answer :
"Meatpacking" industry was most affected by the refrigerated railcar. The meatpacking industry grew because railroads were used to deliver large quantities of meat to processing plants in major cities.
What is Meatpacking industry?
The meatpacking industry are those industries that handle other meat animals and processing the sale of these meat products.
The meatpacking industry grew because the cattle population increased" since many people utilized the railroads to herd cattle in the west on new ranches.
Moreover, people used trains to carry food, so without a refrigeration system the food/meat would go bad.
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