SJ F

Infobox Locomotive
name = Ma
powertype = Electric

---

size = 300px
caption = F 621 at the Swedish Railway Museum
builder = ASEA
builddate = 1942-1949
totalproduction = 17
uicclass = 1'Do1'
gauge = RailGauge|sg
wheeldiameter = 1,000 mm
length = 15,230 mm
height = 4,500 mm
weight = 102.2 tonnes
topspeed = 135 km/h
electricsystem = 15 kV 16⅔ Hz AC
collection method = Pantograph
poweroutput = 2,580 kW
tractiveeffort = 203 kN
railroad = Statens Järnvägar
roadnumber = 601-603, 621-632, 694-702

F is an electric locomotive used by Statens Järnvägar (SJ) of Sweden for hauling passenger trains. It was built in 24 copies by ASEA 1942-49 and was in service to 1983.

History

During the 1930 the standard on Västra Stambanan between Stockholm and Göteborg was improved so the top speed was increased to 120 km/h. At the time SJ did not have locomotives that could reach that speed, so an intensive work was initiated to construct a fast locomotive in cooperation with ASEA. The alternatives were traditional wheel construction or the newer bogie technology. SJ chose the latter with wheel arrangement 1'Do1', with four powered axles. Exterior wise the F-series was very similar to the D-series.

The three test engines delivered in 1942 had different configurations of power transmission. After the testing an addition 21 locomotives were delivered during the 1940s. They differ by only having two instead of three front windows, though the first three were later rebuilt.

The F-series was put into fast express trains on the lines between Malmö and Stockholm, between Malmö and Göteborg, between Stockholm and Göteborg, and between Stockholmn and Oslo, Norway. When the Rc-series came in the late 1960s and during the 1970s the majority of the F-series was moved to Ostkustbanan and the line between Göteborg and Kalmar. Most of the F-series were retired between 1978 and 1983. The last regular traffic with the series was in the Stockholm area. During this last period the top speed was reduced from 135 to 100 km/h. Three of the locomotives have been preserved.

External links

* [http://www.jarnvag.net/lokguide/F.asp Järnväg.net on F]