High Quality Content by WIKIPEDIA articles! The Swedish part of the ore line, Malmbanan, was electrified in 1915 but Norway kept using steam locomotives until the Norwegian electrification in 1923. As Norwegian traction the El 3 was chosen along with five triple-engine El 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.

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