The old maintenance sheds in Oulu were only used to service locomotives. The passenger carriages were cleaned and serviced outdoors. In the new halls, all of the work is done indoors. The premises were designed in accordance with the operations and the natural flow of goods. The railway yard and operations in the hall are controlled centrally. Food and other supplies are loaded onto passenger trains in the maintenance hall (22 m x 334 m). The rolling stock is cleaned, waste is removed and ice that has accumulated on the bogies is melted. All types of rolling stock can be serviced in the hall – up to four full-length trains at the same time. The building also has a maintenance and repair hall for nine carriages or locomotives and a refuelling hall for diesel locomotives, as well as office, warehouse and technical spaces. The halls have gantry cranes.