masters at fifteen stations and replacing them with a clerk. Initially, all trains on the line were hauled by steam locomotives, in particular NSB Class 20 and NSB Class 21 brought in used from other lines. The first diesel multiple units were taken into use in the 1930s, with the line seeing the use of both NSB Class Cmb 16 and Kristine Valdresdatter. During World War II, the line was again entirely hauled by steam locomotives and the service was reduced considerably. By 1945, there were three round trips per week, but after the war ended, the frequency increased and by 1947 there were four daily round trips. Various classes of multiple units have been used, including NSB Class 86, NSB Class 87 and NSB Class 91. During the 1950s, there were sometimes also trains that operated just from Kongsberg to Veggli. Because the conductors and engineers often knew where the locals lived or were headed, trains would make non-scheduled stops to disembark passengers to allow them a shorter walk. In the 1960s, the number of round trips was reduced to three per day, allowing the whole service to be operated with a single unit. NSB used steam power for freight trains until 1970, when NSB's last scheduled steam locomotive service hauled a gravel train from Svene to Kongsberg. For a short period during the 1980s, there were also school trains, but as this forced NSB to operate two multiple units on the line, it proved too expensive and was soon afterwards again provided by bus. Discussion about closing the line started in the 1950s, and the line became a candidate every time NSB and the parliament discussed closures. In 1988, the parliament decided to close many Norwegian lines, including the Numedal Line, although it was decided that the section from Kongsberg to Rollag was to be kept for freight traffic. The last passenger train operated on 31 December 1988 and the line north of Rollag was officially closed on 1 January 1989. By the time the line closed in 1989, manning remained at only three stations: Flesberg, Veggli and Rødberg. NSB retained some traffic south of Flesberg; in 1993 the company hauled of gravel and of lumber along the line. After the closure, the non-profit organization Friends of the Numedal Line was established and offered occasional heritage rides along the line. It maintains the tracks between Rollag and Rødberg