| SJ F | |
| Powertype: | Steam |
| Builder: | NOHAB |
| Serialnumber: | 1020, 1061-1070 |
| Builddate: | 1914–1916 |
| Whytetype: | 4-6-2 |
| Uicclass: | 2′C1′ h4v |
| Driverdiameter: | 18800NaN0 |
| Length: | 213000NaN0 |
| Locoweight: | [1] |
| Cylindercount: | Four, compound |
| Maxspeed: | 90km/h (110abbr=onNaNabbr=on in Danish service) |
| Poweroutput: | 11400NaN0 |
| Operator: | Statens Järnvägar, Danske Statsbaner |
| Numinclass: | 11 |
| Disposition: | retired |
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. It was primarily used on the main lines between Stockholm-Gothenburg and Stockholm-Malmö. It is one of the largest steam locomotives ever used in Sweden.
The superheated compound locomotive could produce 1140kW.
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. The E class remained in service into the early 1970s. 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.
Two of the Swedish-built locomotives are preserved and F 1200 is in running condition. Both are owned by the Swedish Railway Museum. Several Frichs-built locomotives are preserved in Denmark, and E 996 at Railworld in Peterborough. F 1200 was involved in a serious accident outside Getå in October 1918.