Williams Tank Lines is one of the largest bulk petroleum carriers. The company operates more than 100 units in nearly eight locations in California and Nevada. Williams Tank Lines offers a variety of services to its customers that include 24-hour delivery services for various types of petroleum products. The company also operates a fleet of Interstate Commerce Commission-licensed vehicles to transport bulk products throughout the West. Williams Tank Lines has been operational since 1976 and is located in San Jose, Calif. Additionally, the company provides a range of equipment for sales that includes Peterbilt and Freightliner engines and cummins.