The Tulsa-Sapulpa Union Railway Co. (TSU) is a small Oklahoma shortline railway that operates between Sapulpa and Tulsa, Oklahoma. It is one of Oklahoma's oldest operating railroads with origins dating back to 1907. The railroad operates trackage between Tulsa and Sapulpa serving St. Gobain Glass Plant, Prescor Inc., Greenbay Packaging Inc, Atlantis Plastics, CG Martin Company and Technotherm Corporation. The railway also operates trackage between Tulsa and Jenks, Oklahoma on behalf of the Union Pacific Railroad (UP). This trackage serves Sinclair Oil Refinery, Kentube, Word Industries, Pepsi Cola Co., and Kimberly Clark Corporation. TSU has a direct connection with the Union Pacific in Tulsa, and Burlington Northern Santa Fe (BNSF) railroad in Sapulpa, serving customers throughout the Tulsa Metropolitan area.