The F class was a type of steam locomotive used by Swedish State Railways (Swedish: Statens Järnvägar, SJ) and based on the Württemberg C. Eleven locos were built by Nydquist & Holm (NOHAB) between 1914 and 1916.

The superheated compound locomotive could produce 1,140 kilowatts (1,529 hp).

During the 1930s the locomotives became obsolete due to electrification of the main lines, and in 1937[2] were sold to DSB of Denmark, where they served as DSB Class E[3] DSB was so impressed with the performance of the E class that starting 1942, a further 25 locos were built by Frichs of Aarhus.

On the death of king Frederik IX the funeral train from Copenhagen to Roskilde on 14 January 1972 was double-headed by two class Es.

Several Frichs-built locomotives are preserved in Denmark, and E 996 at Railworld in Peterborough.