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The Swedish part of the ore line, theIron Ore Line, was electrified in 1915 but Norway kept usingsteam locomotives until the Norwegian electrification in 1923. As Norwegian traction the El 3 was chosen along with five triple-engineEl 4 units. Eight El 3 were built with delivery on August 9, 1925, two more on October 19, 1929. The El 3 and El 4 had about the same characteristics and used for the same purpose and ordered simultaneously; choosing two models like this is atypical for railway companies because of higher maintenance costs.
By 1922 SJ had placed an order on the newOf-locomotives, yet NSB chose to base the El 3 on the olderOe. Build byASEA, they were equipped withquill drive andregenerative braking; the latter only caused problems though, excessively increasing the current that caused damage. They only served on the Norwegian lines until 1949, after which they were where put into through trains toKiruna. In 1950LKAB decided to increase the mine output, requiring trains now to haul 3,100 tonnes (3,051 long tons; 3,417 short tons). In 1953-54 the locomotives were rebuilt to three triple-engine sets and supplemented with eightEl 12. When LKAB chose to increase train weights more in the late 1960s, NSB responded with the order of theEl 15. All El 3 and El 4 units were taken out of service with the delivery in 1967, none being preserved.
