The Arkansas–Oklahoma Railroad (reporting mark AOK) is a Class III carrier headquartered in Wilburton, OK that operates two segments of the former Chicago, Rock Island and Pacific Railroad (CRIP) Choctaw Route that originally ran between Memphis Tennessee and Tucumcari, New Mexico.

AOK started operations on March 3, 1996 on 73 miles (117 km) of track then owned by the U.S. state of Oklahoma between Howe and McAlester by assuming the existing lease of the Missouri Pacific, then wholly owned by the Union Pacific Railroad (UP).

The bridge over the Canadian River was restored in 2014 for service to the Citizen Potawatomi Nation Iron Horse Industrial Park, with the line open to milepost 445.

AOK completed a lease and new switching agreement with BNSF for the Shawnee industrial lead in October 2021.

This approximately 10 mile lead is the remnant of the Cushing to Paul's Valley Santa Fe line.