Blackstone was elected
mayor of LaSalle in 1854 and served a single term, his only foray into politics. After leaving office, he returned to working on railroads, first as chief engineer of the
Joliet and Chicago Railroad, which would eventually become the Chicago and Alton Railroad. Although Blackstone served with the Alton Railroad for more than a quarter century, he refused a salary. When the directors voted to pay him $10,000 per year, he turned it down. In addition to his employment and activities with the railroads, Blackstone was the first president of the company that controlled the
Union Stock Yards. Although Blackstone had refused a salary from the railroad, he was an investor in it. In 1899, a competing group of investors headed by
E. H. Harriman wanted to purchase the Alton Railroad but Blackstone disapproved of the sale. After many months of wrangling, Blackstone transferred all of his stock in the company to the United States Trust Company and resigned as president, effective April 1, 1899. This action allowed the Harriman-led group to assume control of the line. In 1868, Blackstone married Isabella Farnsworth Norton, the daughter of a successful businessman from
Norwich, Connecticut. Blackstone died of
pneumonia on May 26, 1900, in Chicago, Illinois. His funeral was held at the Second Presbyterian Church and was then transported to Norwich, Connecticut for burial. ==Blackstone Mansion==