(reporting mark TSU) is a Class III shortline rail carrier[1] which operates freight service between Tulsa, Oklahoma and Sapulpa, Oklahoma over 10 miles of track known as the Sapulpa Lead, and which also leases and operates a 12.9 mile section of Union Pacific track known as the Jenks Industrial Lead between Tulsa and Jenks, Oklahoma.

[2][3] The line connects with two Class I railroads, being the Union Pacific at Tulsa and the BNSF at Sapulpa,[2] and additionally connects to its fellow Class III shortline, the Sand Springs Railway, in Tulsa.

[5] Major customers on the Sapulpa Lead include Technotherm, Prescor, and Ardagh Glass,[5] and on the Jenks Industrial Lead, the HF Sinclair oil refinery, Kentube, Word Industries, Pepsi Cola, and Kimberly-Clark.

[7] Oklahoma Union served Tulsa and communities to the southwest, and had unsuccessfully tried to reach Sapulpa.

[9] The current lease agreement with Union Pacific on the Jenks Industrial Lead was signed December 21, 2018 for an initial five-year term, which may be extended by TSU for an additional 15 years.