description SJ Rc Class (Sweden) Overview
The SJ Rc class is a family of electric locomotives introduced in 1967 for the Swedish State Railways (SJ). Designed and built by the Swedish engineering firm ASEA, the Rc class was notable for being the first locomotive family in Sweden to use thyristor control for alternating current. This technology allowed for smoother acceleration and higher tractive effort compared to older models. The platform proved successful and was adapted for international markets, notably serving as the basis for the Amtrak AEM-7 in the United States.
insights Ranking position
SJ Rc Class (Sweden) ranks #161 of 397 in the Locomotive ranking, behind JR-Freight DE10, ahead of LMS Black Five.
balance SJ Rc Class (Sweden) Pros & Cons
- Influential thyristor control technology
- Reliable ASEA engineering
- Widely adopted in Scandinavia
- Versatile operating capability
- Aging 1960s design
- Gradually being replaced
help SJ Rc Class (Sweden) FAQ
Why was the Swedish Rc locomotive's thyristor control important?
Thyristor electronics allowed smoother and more efficient control of traction-motor power than older tap-changer systems. ASEA's technology, introduced on the Rc family in 1967, influenced later electric locomotives in several countries.
How is the SJ Rc related to Amtrak's AEM-7?
Amtrak's AEM-7 was developed from ASEA technology demonstrated by the Swedish Rc design. The American locomotive was adapted for the Northeast Corridor rather than being a direct, unchanged copy.
What kinds of trains have Rc locomotives hauled in Sweden?
Members of the family have worked both passenger and freight services for Swedish State Railways and successor operators. Different subclasses were optimized for duties such as higher-speed passenger running or heavy freight.
Why do Rc locomotives have several subclass numbers?
The Rc family evolved through versions such as Rc1, Rc2, Rc3, Rc4, Rc5, and Rc6. These variants reflect changes in gearing, electronics, permitted speed, and later rebuilding programs.
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