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Carnegie Left Railroad
When Carnegie was eighteen he was working in Pittsburgh, Pennsylvania, as the private secretary to a railroad official named Thomas Alexander Scott. In 1865 he made the decision to leave the railroad. After leaving the railroad, Carnegie started his own company making railroad bridges from iron. -
Carnegie Steel Company
Eight years later after starting his own company, he started his first steel mill, and by 1899, when he consolidated into the Carnegie Steel Company he controlled a quarter of American iron and steel production.