Erik Lönnroth was the son of Magnus Lönnroth, District Secretary of Swedish State Railways in Gothenburg, and Gerda (Kjellberg) Lönnroth .
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In a different context, some high speed trains, such as the Adtranz X 2000 on Swedish State Railways, are fitted with the equipment, again for emergency use only.
The company was subsequently acquired by Statens Järnvägar (now SJ AB), the Swedish State Railways, which expanded the operations until it was sold off to one of the managers, Rolf Friberg, in 1965.