At Traylor Bros., building bridges and tunnels is a family affair. The family-owned heavy/civil construction company also works on dams and ports, storm sewers, and transmission lines. The company's new mining division focuses on copper, gold, and coal mine development in North America. Additionally, the company offers used and surplus equipment for sale. Traylor Bros operates throughout the US through its heavy/civil, underground/tunneling, and Traylor Pacific divisions. Traylor Bros.' projects include work for the San Francisco's Bay Area Rapid Transit (BART) system and the I-10 span bridges over Lake Pontchartrain in Louisiana. Civil engineer William Traylor founded Traylor Bros. in Indiana in 1946.