What was the first advance in refrigeration technologies in the 1800s?

A US patent for refrigeration was filed.
A practical refrigerated train car was built.
A refrigerated ship transported meat by sea.
A refrigerated food storage plant was built.

1 answer

The first significant advance in refrigeration technologies in the 1800s was the development of a practical refrigerated train car. This innovation was crucial for the transportation of perishable goods over long distances, effectively enabling the meat industry and other sectors to expand. The refrigerated train car was introduced in the 1860s, making it a pivotal advancement in refrigeration technology during that period.