The Scranton Iron Furnaces is a historic site that preserves the heritage of iron making in the U.S. State of Pennsylvania and is located in Scranton, near the Steamtown National Historic Site. It protects the remains of four stone blast furnaces which were built between 1848 and 1857. Iron production on the site was started by Scranton, Grant & Company in 1840. Later, the furnaces were operated by the Lackawanna Iron & Coal Company. In 1847, iron rails for the Erie Railroad were made at the site. In 1865, Scranton, Grant & Company had the largest iron production capacity in the United States. In 1875, steel production started at the site. In 1880, the furnaces produced 125,000 tons of pig iron, one of the main uses of which was in the making of t-rails.