 Its partner in the project, the Stillwater Central Railroad, an indirect subsidiary of the Kansas-based Watco Companies, came into the process when it purchased a nearly 100-mile-long railroad line, known as the Sooner Sub, from the state of Oklahoma in 2014.That line runs from Sapulpa, Oklahoma near Tulsa to Del City, Oklahoma near Oklahoma City.The contract included a requirement to start a six-month daily passenger service trial run before August 2019, with a financial penalty for not meeting the deadline set at $2.8 million.