Throughout his life, Carnegie would earn his money from multiple investments. But at first Carnegie started to gain wealth when he bought shares from Adams Express company. Such as investing in "sleeping cars" (Train cars with beds in them), an investment in an oil company. While these were also good ways of earning money Carnegie gained most of his profit from his Keystone Bridge Company in 1865. But in 1868 Carnegie pledged to resign from the company with an income of $50,000 per year. All of these factors most likely helped him gain the money he needed to start his company.