Union Pacific Corporation is a railroad operating company in the United States. The Company operates through its principal operating company, Union Pacific Railroad Company (UPRR). Its business mix includes Agricultural Products, Automotive, Chemicals, Coal, Industrial Products and Intermodal. Its freight traffic consists of bulk, manifest, and premium business. Bulk traffic primarily consists of coal, grain, soda ash, ethanol, rock and crude oil shipped in unit trains-trains transporting a single commodity from one origin to one destination. Manifest traffic includes individual carload or less than train-load business involving commodities, such as lumber, paper, food and chemicals. The transportation of finished vehicles, auto parts, intermodal containers and truck trailers are included as part of its premium business. As of December 31, 2016, its network included 32,070 route miles, linking Pacific Coast and Gulf Coast ports with the Midwest and Eastern United States gateways.