The most beautiful steam locomotive on the Danish State Railways (DSB) was the class (Litra) E. It originated among eleven Pacific express locomotives of the Swedish State Railways (SJ) class F, which disappeared from service in 1937 due to increasing electrification. The DSB was able to acquire these powerful locomotives and then roster them as road numbers E 964–974. Starting in 1940, the DSB urgently needed additional powerful steam locomotives and so it had another 25 class E locomotives built with small improvements by Frichs in Aarhus as road numbers E 975–999. These Pacifics maintained their role pulling passenger and freight trains up into the Sixties. However, one after the other they were put into storage. Several units were preserved however, including road number E 991 as an official DSB museum locomotive.