A heavyweight in the heavy construction industry, Peter Kiewit Sons' represents one of North America's largest construction and engineering firms. It builds everything from roads and dams to high-rise office towers and power plants. Focusing on projects located throughout the US and Canada, the company's transportation projects include bridges, rail lines, airport runways, and mass transit systems, which altogether account for a majority of its sales. Kiewit also serves the oil and gas, electrical, power, and waterworks industries. Affiliate Kiewit Mining owns coal mines in Texas, Montana, and Wyoming. The company, which was founded in 1884, is owned by employees and Kiewit family members.