Westinghouse Air Brake Co. Westinghouse Co. works (pouring molds) - From the Library of Congress

In 1904, Westinghouse Companies created a series of short silent movies depicting various enterprises.

In this 3-minute video, men working in teams carry buckets of molten material and pour the material into what appear to be molds lined up on the ground.

https://www.loc.gov/item/96521979/