Andrew Carnegie established the Edgar Thomson Steel Works in Braddock, Pennsylvania, in 1875. It was the first mill in the United States to successfully implement the Bessemer process on a large scale. Named after J. Edgar Thomson, president of the Pennsylvania Railroad, the mill was built to supply the rail industry with steel rails.
At its peak, the Edgar Thomson Works employed 8,000 workers operating three shifts, 24 hours a day, seven days a week. It became known for its efficiency, innovation, and role in shaping modern steelmaking methods. It remains one of the oldest functioning steel mills in the United States.
- Collections: Cory Bonnet