The Southwestern Railroad (reporting mark SW) is a Class III railroad operating since 1990, and until 2017 consisted of two unconnected railroad sections in New Mexico, with no shared functions. These and a third section in the Texas panhandle and Oklahoma, now closed, all operated separately. Since January 2017, only the Whitewater Division is operated by Southwestern. Southwestern is one of several short-line railroads which were operated by The Western Group of Ogden, Utah. On November 1, 2020, Southwestern was sold by Western to Jaguar Transport Holdings of Joplin, Missouri.