It was merged into a sister railroad company, the Central Kansas Railway, in 2000. The Central Kansas Railway was later sold to Watco Companies and became the Kansas and Oklahoma Railroad. KSW had a small roster of former Grand Trunk Western Railroad GM-Electromotive Division GP9s, 4544, 4557, 4912 and 4916.
In 2000, Kansas Southern Railway (KSW) merged with a sister railroad company, the Central Kansas Railway. This railway was later acquired by Watco Companies and became known as the Kansas and Oklahoma Railroad. KSW had a small group of former Grand Trunk Western Railroad GM-Electromotive Division GP9 locomotives: 4544, 4557, 4912, and 4916.