File:Soudan Underground Mine SP IMG 1068 rotary converter AC to DC undergr train.JPG - Wikimedia Commons
File:Former rotary converter from School Street substation (1), September 2022.JPG - Wikimedia Commons
File:Former rotary converter from School Street substation (2), September 2022.JPG - Wikimedia Commons
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File:Rotary converter set with separate exciter (Rankin Kennedy, Electrical Installations, Vol III, 1903).jpg - Wikimedia Commons
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