Special Car Order 90 (SCO90) assists with the maintenance of Special Car Order 90. SCO90 was approved by the AAR, Equipment Assets Committee (EAC) and the AAR Safety and Operations Management Committee (SOMC) in recognition of the need to efficiently move surplus unassigned empty, indirect-connection, and railroad-owned freight cars to the home railroad without incurring the time, car hire, and transportation costs involved in reverse route to home rails when cars have had multiple loaded cycles.