Looks like SJ will start with the easy to build and high traffic portions of the line first. I rode on the parallel highway for the Stockholm to Goteborg line back in 1986, some pretty country. One of the more rugged segments will be just west of Jonkoping, which is not part of the construction described in the article.
http://www.globalconstructionreview.com/news/jacobs-chosen-oversee-24bn-high-speed-rail-line-sw/
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