Andrew Carnegie was a captain of industry in the 1800's. He was a person who made billions off of the steel industry. He was smart and knew that the ever growing railroads needed steel to lay tracks, and he struck a deal to profit off of all the railroads being laid.
Carnegie's factories were built to produce the most steel the fastest. Using the Bessemer Process, the steel is produced faster than all competitors, sold at lower prices, and Carnegie makes more money than anyone in the world.